Simple Gnuradio User Manual V1.0

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Simple User Manual for Gnuradio 3.1.1

Copyright 2007 Free Software Foundation, Inc.
This document is part of GNU Radio
GNU Radio is free software, you can redistribute it and/or modify It under the terms of the GNU
General Public License as published by the Free Software Foundation, either version 3, or (at your
option) any later version.
GNU Radio is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with GNU Radio; see the
file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Boston, MA
02110-1301, USA.

This Document Was Last Updated on:
25-November-2007
By:
Firas Abbas

Page 2 of 208

Simple Gnuradio User Manual

Table of Contents
1)

GNURADIO PACKAGE........................................................................................................................................ 19
1.1)

GNURADIO/BLKS SUB PACKAGE...................................................................................................................... 19

1.1.1)

gnuradio/blksimpl/am_demod.py ................................................................................................. 19

1.1.1.1) am_demod_cf ( ) ...................................................................................................................................................19
1.1.1.2) demod_10k0a3e_cf ()...........................................................................................................................................19

1.1.2)

gnuradio/blksimpl/channel_model.py ......................................................................................... 19

1.1.2.1) channel_model ( ) .................................................................................................................................................20

1.1.3)

gnuradio/blksimpl/cpm.py .............................................................................................................. 20

1.1.3.1) cpm_mod ( ) ...........................................................................................................................................................20

1.1.4)

gnuradio/blksimpl/d8psk.py........................................................................................................... 21

1.1.4.1) d8psk_mod ( )........................................................................................................................................................21
1.1.4.2) d8psk_demod ( ) ...................................................................................................................................................21

1.1.5)

gnuradio/blksimpl/dbpsk.py........................................................................................................... 22

1.1.5.1) dbpsk_mod ( )........................................................................................................................................................22
1.1.5.2) dbpsk_demod ( ) ...................................................................................................................................................23

1.1.6)

gnuradio/blksimpl/dqpsk.py........................................................................................................... 23

1.1.6.1) dqpsk_mod ( )........................................................................................................................................................23
1.1.6.2) dqpsk_demod ( ) ...................................................................................................................................................24

1.1.7)

gnuradio/blksimpl/filterbank.py .................................................................................................... 24

1.1.7.1) synthesis_filterbank ( )........................................................................................................................................25
1.1.7.2) analysis_filterbank ( ) ..........................................................................................................................................25

1.1.8)

gnuradio/blksimpl/fm_demod.py .................................................................................................. 26

1.1.8.1) fm_demod_cf ( ) ....................................................................................................................................................26
1.1.8.2) demod_20k0f3e_cf ()............................................................................................................................................26
1.1.8.3) demod_200kf3e_cf ()............................................................................................................................................26

1.1.9)

gnuradio/blksimpl/fm_emph.py..................................................................................................... 27

1.1.9.1) fm_deemph ( )........................................................................................................................................................27
1.1.9.2) fm_preemph () .......................................................................................................................................................27

1.1.10)

gnuradio/blksimpl/gmsk.py ............................................................................................................ 28

1.1.10.1) gmsk_mod ( ).......................................................................................................................................................28
1.1.10.2) gmsk_demod ( ) ..................................................................................................................................................29

1.1.11)

gnuradio/blksimpl/nbfm_rx.py....................................................................................................... 29

1.1.11.1) nbfm_rx ( ) ............................................................................................................................................................29

1.1.12)

gnuradio/blksimpl/nbfm_tx.py....................................................................................................... 30

1.1.12.1) nbfm_tx ( ) ............................................................................................................................................................30

1.1.13)

gnuradio/blksimpl/ofdm.py............................................................................................................. 30

1.1.13.1) ofdm_mod ( ) .......................................................................................................................................................30
1.1.13.2) ofdm_demod ( )...................................................................................................................................................31

1.1.14)

gnuradio/blksimpl/ofdm_sync_fixed.py ...................................................................................... 31

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1.1.14.1) ofdm_sync_fixed ( ) ...........................................................................................................................................31

1.1.15)

gnuradio/blksimpl/ofdm_sync_ml.py........................................................................................... 31

1.1.15.1) ofdm_sync_ml ( ) ................................................................................................................................................31

1.1.16)

gnuradio/blksimpl/ofdm_sync_pn.py .......................................................................................... 32

1.1.16.1) ofdm_sync_pn ( )................................................................................................................................................32

1.1.17)

gnuradio/blksimpl/ofdm_sync_pnac.py ...................................................................................... 32

1.1.17.1) ofdm_sync_pnac ( ) ...........................................................................................................................................32

1.1.18)

gnuradio/blksimpl/ofdm_receiver.py ........................................................................................... 32

1.1.18.1) ofdm_receiver ( ).................................................................................................................................................32

1.1.19)

gnuradio/blksimpl/pkt.py ................................................................................................................ 33

1.1.19.1) mod_pkts ( ) .........................................................................................................................................................33
1.1.19.1) demod_pkts ( ) ....................................................................................................................................................33

1.1.20)

gnuradio/blksimpl/psk.py................................................................................................................ 34

1.1.21)

gnuradio/blksimpl/qam.py .............................................................................................................. 34

1.1.22)

gnuradio/blksimpl/qam8.py ............................................................................................................ 34

1.1.22.1) qam8_mod ( ).......................................................................................................................................................34
1.1.22.2) qam8_demod ( ) ..................................................................................................................................................34

1.1.23)

gnuradio/blksimpl/qam16.py.......................................................................................................... 35

1.1.23.1) qam16_mod ( ).....................................................................................................................................................35
1.1.23.2) qam16_demod ( ) ................................................................................................................................................36

1.1.24)

gnuradio/blksimpl/qam64.py.......................................................................................................... 36

1.1.24.1) qam64_mod ( ).....................................................................................................................................................36
1.1.24.2) qam64_demod ( ) ................................................................................................................................................37

1.1.25)

gnuradio/blksimpl/qam256.py........................................................................................................ 37

1.1.25.1) qam256_mod ( ) ..................................................................................................................................................37
1.1.25.2) qam256_demod ( )..............................................................................................................................................38

1.1.26)

gnuradio/blksimpl/rational_resampler.py................................................................................... 38

1.1.26.1) rational_resampler ( ) ........................................................................................................................................38
1.1.26.2) design_filter ( ) ....................................................................................................................................................39

1.1.27)

gnuradio/blksimpl/standard_squelch.py .................................................................................... 39

1.1.27.1) standard_squelch ( )..........................................................................................................................................39

1.1.28)

gnuradio/blksimpl/wfm_rcv.py ...................................................................................................... 39

1.1.28.1) wfm_rcv ( )............................................................................................................................................................40

1.1.29)

gnuradio/blksimpl/wfm_rcv_pll.py ............................................................................................... 40

1.1.29.1) wfm_rcv_pll ( ).....................................................................................................................................................40

1.1.30)

gnuradio/blksimpl/wfm_tx.py......................................................................................................... 40

1.1.30.1) wfm_tx ( ) ..............................................................................................................................................................40

1.1.31)

gnuradio/blksimpl/cvsd.py ............................................................................................................. 41

1.1.31.1) cvsd_encode ( )...................................................................................................................................................41
1.1.31.2) cvsd_decode ( )...................................................................................................................................................41

1.2)

GNURADIO/BLKS2 SUB PACKAGE ................................................................................................................... 41

1.2.1)

gnuradio/blks2impl/am_demod.py ............................................................................................... 42

1.2.1.1) am_demod_cf ( ) ...................................................................................................................................................42

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1.2.1.2) demod_10k0a3e_cf()............................................................................................................................................42

1.2.2)

gnuradio/blks2impl/channel_model.py ....................................................................................... 42

1.2.2.1) channel_model ( ) .................................................................................................................................................42

1.2.3)

gnuradio/blks2impl/cpm.py ............................................................................................................ 43

1.2.3.1) cpm_mod ( ) ...........................................................................................................................................................43

1.2.4)

gnuradio/blks2impl/d8psk.py......................................................................................................... 44

1.2.4.1) d8psk_mod ( )........................................................................................................................................................44
1.2.4.2) d8psk_demod ( ) ...................................................................................................................................................44

1.2.5)

gnuradio/blks2impl/dbpsk.py ........................................................................................................ 45

1.2.5.1) dbpsk_mod ( )........................................................................................................................................................45
1.2.5.2) dbpsk_demod ( ) ...................................................................................................................................................45

1.2.6)

gnuradio/blks2impl/dqpsk.py ........................................................................................................ 46

1.2.6.1) dqpsk_mod ( )........................................................................................................................................................46
1.2.6.2) dqpsk_demod ( ) ...................................................................................................................................................46

1.2.7)

gnuradio/blks2impl/filterbank.py .................................................................................................. 47

1.2.7.1) synthesis_filterbank ( )........................................................................................................................................47
1.2.7.2) analysis_filterbank ( ) ..........................................................................................................................................48

1.2.8)

gnuradio/blks2impl/fm_demod.py ................................................................................................ 48

1.2.8.1) fm_demod_cf ( ) ....................................................................................................................................................48
1.2.8.2) demod_20k0f3e_cf ()............................................................................................................................................49
1.2.8.3) demod_200kf3e_cf ()............................................................................................................................................49

1.2.9)

gnuradio/blks2impl/fm_emph.py................................................................................................... 49

1.2.9.1) fm_deemph ( )........................................................................................................................................................49
1.2.9.2) fm_preemph () .......................................................................................................................................................50

1.2.10)

gnuradio/blks2impl/gmsk.py.......................................................................................................... 51

1.2.10.1) gmsk_mod ( ).......................................................................................................................................................51
1.2.10.2) gmsk_demod ( ) ..................................................................................................................................................51

1.2.11)

gnuradio/blks2impl/nbfm_rx.py .................................................................................................... 52

1.2.11.1) nbfm_rx ( ) ............................................................................................................................................................52

1.2.12)

gnuradio/blks2impl/nbfm_tx.py..................................................................................................... 52

1.2.12.1) nbfm_tx ( ) ............................................................................................................................................................52

1.2.13)

gnuradio/blks2impl/ofdm.py .......................................................................................................... 53

1.2.13.1) ofdm_mod ( ) .......................................................................................................................................................53
1.2.13.2) ofdm_demod ( )...................................................................................................................................................53

1.2.14)

gnuradio/blks2impl/pkt.py .............................................................................................................. 54

1.2.14.1) mod_pkts ( ) .........................................................................................................................................................54
1.2.14.2) demod_pkts ( ) ....................................................................................................................................................54

1.2.15)

gnuradio/blks2impl/psk.py ............................................................................................................. 54

1.2.16)

gnuradio/blks2impl/qam.py ............................................................................................................ 55

1.2.17)

gnuradio/blks2impl/qam8.py.......................................................................................................... 55

1.2.17.1) qam8_mod ( )......................................................................................................................................................55
1.2.17.2) qam8_demod ( ) ..................................................................................................................................................55

1.2.18)

gnuradio/blks2impl/qam16.py........................................................................................................ 56

1.2.18.1) qam16_mod ( ).....................................................................................................................................................56

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1.2.18.2) qam16_demod ( ) ................................................................................................................................................56

1.2.19)

gnuradio/blks2impl/qam64.py........................................................................................................ 57

1.2.19.1) qam64_mod ( ).....................................................................................................................................................57
1.2.19.2) qam64_demod ( ) ................................................................................................................................................57

1.2.20)

gnuradio/blks2impl/qam256.py ..................................................................................................... 58

1.2.20.1) qam256_mod ( ) ..................................................................................................................................................58
1.2.20.2) qam256_demod ( )..............................................................................................................................................58

1.2.21)

gnuradio/blks2impl/rational_resampler.py................................................................................. 59

1.2.21.1) rational_resampler ( ) ........................................................................................................................................59
1.2.21.2) design_filter ( ) ....................................................................................................................................................59

1.2.22)

gnuradio/blks2impl/standard_squelch.py .................................................................................. 60

1.2.22.1) standard_squelch ( )..........................................................................................................................................60

1.2.23)

gnuradio/blks2impl/wfm_rcv.py .................................................................................................... 60

1.2.23.1) wfm_rcv ( )............................................................................................................................................................60

1.2.24)

gnuradio/blks2impl/wfm_rcv_pll.py ............................................................................................. 60

1.2.24.1) wfm_rcv_pll ( )....................................................................................................................................................61

1.2.25)

gnuradio/blks2impl/wfm_tx.py ...................................................................................................... 61

1.2.25.1) wfm_tx ( ) ..............................................................................................................................................................61

1.3)

GNURADIO/WXGUI SUB PACKAGE

1.3.1)

................................................................................................................... 61

gnuradio/wxgui/fftsink.py ............................................................................................................... 61

1.3.1.1) fft_sink_x ( ) ..........................................................................................................................................................61

1.3.2)

gnuradio/wxgui/fftsink2.py ............................................................................................................. 62

1.3.2.1) fft_sink_x ( ) ..........................................................................................................................................................62

1.3.3)

gnuradio/wxgui/scopesink.py........................................................................................................ 62

1.3.3.1) scope_sink_x ( )...................................................................................................................................................62

1.3.4)

gnuradio/wxgui/scopesink2.py...................................................................................................... 62

1.3.4.1) scope_sink_x ( )...................................................................................................................................................63
1.3.4.2) constellation_sink ( ) ..........................................................................................................................................63

1.3.5)

gnuradio/wxgui/form.py .................................................................................................................. 63

1.3.6)

gnuradio/wxgui/numbersink.py..................................................................................................... 63

1.3.6.1) number_sink_x ( )................................................................................................................................................63

1.3.7)

gnuradio/wxgui/numbersink2.py................................................................................................... 63

1.3.7.1) number_sink_x ( )................................................................................................................................................64

1.3.8)

gnuradio/wxgui/waterfallsink.py ................................................................................................... 64

1.3.8.1) waterfall_sink_x ( ) ..............................................................................................................................................64

1.3.9)

gnuradio/wxgui/waterfallsink2.py ................................................................................................. 64

1.3.9.1) waterfall_sink_x ( ) ..............................................................................................................................................64

1.3.10)

gnuradio/wxgui/plot.py .................................................................................................................... 65

1.3.11)

gnuradio/wxgui/powermate.py ...................................................................................................... 65

1.3.12)

gnuradio/wxgui/silder.py................................................................................................................. 65

1.3.13)

gnuradio/wxgui/stdgui.py ............................................................................................................... 65

1.3.14)

gnuradio/wxgui/stdgui2.py ............................................................................................................. 65

1.3.15)

gnuradio/wxgui/ra_fftsink.py ......................................................................................................... 65

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1.3.15.1) ra_fft_sink_x ( ) ..................................................................................................................................................65

1.3.16)

gnuradio/wxgui/ra_fftsink.py ......................................................................................................... 66

1.3.16.1) ra_fft_sink_x ( ) ..................................................................................................................................................66

1.3.17)

gnuradio/wxgui/ra_waterfallsink.py ............................................................................................. 66

1.3.17.1) waterfall_sink_x ( ) ............................................................................................................................................66

1.3.18)

gnuradio/wxgui/ra_stripcharsink.py ............................................................................................ 66

1.3.18.1) stripchar_sink_x ( ) ...........................................................................................................................................67

1.4)

GNURADIO/VOCODER SUB PACKAGE ............................................................................................................. 67

1.4.1)

gnuradio/vocoder/gsm_full_rate.py ............................................................................................. 67

1.4.1.1) encode_sp ( ) ........................................................................................................................................................67
1.4.1.2) decode_ps ( ) ........................................................................................................................................................67

1.4.2)

gnuradio/vocoder/cvsd_vocoder.py ............................................................................................ 67

1.4.2.1) encode_sb ( ) ........................................................................................................................................................68
1.4.2.2) decode_bs ( ) ........................................................................................................................................................68

1.5)

GNURADIO/PAGER SUB PACKAGE .................................................................................................................. 68

1.5.1)

gnuradio/pager/flex_demod.py...................................................................................................... 68

1.5.1.1) flex_demod ( ).......................................................................................................................................................68

1.5.2)

gnuradio/pager/pager_swig.py...................................................................................................... 68

1.5.3)

gnuradio/pager/aypabtu.py ............................................................................................................ 69

1.5.4)

gnuradio/pager/usrp_flex.py .......................................................................................................... 69

1.5.5)

gnuradio/pager/usrp_flex_all.py ................................................................................................... 69

1.5.6)

gnuradio/pager/usrp_flex_band.py .............................................................................................. 69

1.6)

GNURADIO/GRUIMPL SUB PACKAGE ............................................................................................................... 70

1.6.1)

gnuradio/ gruimpl /crc.py................................................................................................................ 70

1.6.1.1) gen_and_append_crc32 ( )................................................................................................................................70
1.6.1.2) check_crc32 ( ) .....................................................................................................................................................70

1.6.2)

gnuradio/ gruimpl /freqz.py ............................................................................................................ 70

1.6.2.1) freqz ( ) ...................................................................................................................................................................70

1.6.3)

gnuradio/ gruimpl /gnuplot_freqz.py ........................................................................................... 71

1.6.3.1) gnuplot_freqz ( )...................................................................................................................................................71

1.6.4)

gnuradio/ gruimpl /gnuplot_freqz.py ........................................................................................... 71

1.6.4.1) gnuplot_freqz ( )...................................................................................................................................................71

1.6.5)

gnuradio/ gruimpl /hexint.py .......................................................................................................... 72

1.6.5.1) hexint ( ) .................................................................................................................................................................72

1.6.6)

gnuradio/ gruimpl /listmsc.py ........................................................................................................ 72

1.6.6.1) list_revers ( ) .........................................................................................................................................................72

1.6.7)

gnuradio/ gruimpl /lmx2306.py ...................................................................................................... 72

1.6.7.1) lmx2306 ( ) .............................................................................................................................................................72

1.6.8)

gnuradio/ gruimpl /mathmisc.py ................................................................................................... 73

1.6.9)

gnuradio/ gruimpl /os_read_exactly.py....................................................................................... 73

1.6.9.1) os_read_exactly ( ) ..............................................................................................................................................73

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1.6.10)

Page 7 of 208

gnuradio/ gruimpl /sdr_1000.py..................................................................................................... 73

1.6.10.1) sdr_1000 ( ) .........................................................................................................................................................73

1.6.11)

gnuradio/ gruimpl /seq_with_cursor.py ...................................................................................... 74

1.6.12)

gnuradio/ gruimpl /socket_stuff.py .............................................................................................. 74

1.6.12.1) tcp_connect_or_die ( ) ....................................................................................................................................74
1.6.12.2) udp_connect_or_die ( )...................................................................................................................................74

1.7)

GNURADIO/GRU SUB PACKAGE ....................................................................................................................... 74

1.8)

GNURADIO/GR SUB PACKAGE......................................................................................................................... 74

1.8.1)

gnuradio/ gr / basic_flow_graph.py.............................................................................................. 75

1.8.2)

gnuradio/ gr / flow_graph.py .......................................................................................................... 75

1.8.3)

gnuradio/ gr / exceptions.py .......................................................................................................... 75

1.8.4)

gnuradio/ gr / gnuradio_swig_py_filter.py.................................................................................. 75

1.8.4.1) iir_filter_ffd ( )......................................................................................................................................................75
1.8.4.2) single_pole_iir_filter_xx ( )...............................................................................................................................76
1.8.4.3) hilbert_fc ( )..........................................................................................................................................................76
1.8.4.4) filter_delay_fc ( ) .................................................................................................................................................76
1.8.4.5) fft _filter_xx ( ) .....................................................................................................................................................76
1.8.4.6) fractional_interpolator_xx ( ) ...........................................................................................................................76
1.8.4.7) goertzel_fc ( ).......................................................................................................................................................77
1.8.4.8) cma_equalizer_cc ( )..........................................................................................................................................77
1.8.4.9) adaptive_fir_ccf ( )..............................................................................................................................................77
1.8.4.10) fir_filter_xxx ( ) ..................................................................................................................................................77
1.8.4.11) freq_xlating_fir_filter_xxx ( ) .........................................................................................................................78
1.8.4.12) interp_fir_filter_xxx ( ) .......................................................................................................................................78
1.8.4.13) rational_resampler_base_xxx ( ) ....................................................................................................................79

1.8.5)

gnuradio/ gr / gnuradio_swig_py_gengen.py ............................................................................ 79

1.8.5.1) add_xx ( ) ................................................................................................................................................................79
1.8.5.2) add_vxx ( ) ..............................................................................................................................................................79
1.8.5.3) add_const_xx ( )....................................................................................................................................................80
1.8.5.4) add_const_vxx ( ) .................................................................................................................................................80
1.8.5.5) argmax_xx ( ) .........................................................................................................................................................80
1.8.5.6) chunks_to_symbols _xx( ) .................................................................................................................................80
1.8.5.7) packed_to_unpacked _xx( ) ...............................................................................................................................81
1.8.5.8) unpacked_to_packed _xx( ) ...............................................................................................................................81
1.8.5.9) divide_xx( ).............................................................................................................................................................81
1.8.5.10) max_xx ( ) .............................................................................................................................................................82
1.8.5.11) multiply_xx ( ) ......................................................................................................................................................82
1.8.5.12) multiply_vxx ( )....................................................................................................................................................82
1.8.5.13) multiply_const_xx ( ) .........................................................................................................................................82
1.8.5.14) multiply_const_vxx ( ) .......................................................................................................................................83
1.8.5.15) mute_xx ( )............................................................................................................................................................83
1.8.5.16) noise_source_x ( )..............................................................................................................................................83
1.8.5.17) peak_detector_xb ( ) ..........................................................................................................................................83

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1.8.5.18) sample_and_hold_xx ( )....................................................................................................................................84
1.8.5.19) sig_source_x ( ) ..................................................................................................................................................84
1.8.5.20) sub_xx ( ) ..............................................................................................................................................................85
1.8.5.21) vector_sink_x ( ) .................................................................................................................................................85
1.8.5.22) vector_source_x ( ) ............................................................................................................................................85

1.8.6)

gnuradio/ gr / gnuradio_swig_py_runtime.py............................................................................ 86

1.8.6.1) io_signature ( ) ......................................................................................................................................................86
1.8.6.2) buffer ()....................................................................................................................................................................86
1.8.6.3) buffer_reader ( ) ....................................................................................................................................................86
1.8.6.4) basic_block ( ) .......................................................................................................................................................87
1.8.6.5) block ( )....................................................................................................................................................................87
1.8.6.6) block_detail ( ) .......................................................................................................................................................87
1.8.6.7) hier_block2 ( )........................................................................................................................................................88
1.8.6.8) single_threaded_scheduler ( )...........................................................................................................................88
1.8.6.9) message ( ).............................................................................................................................................................88
1.8.6.9) message_from_string ( ).....................................................................................................................................88
1.8.6.10) message_handler ( ) ..........................................................................................................................................89
1.8.6.11) msg_queue ( )......................................................................................................................................................89
1.8.6.12) dispatcher ( )........................................................................................................................................................89
1.8.6.13) error_handler ( ) ..................................................................................................................................................89
1.8.6.14) file_error_handler ( ) ..........................................................................................................................................90
1.8.6.15) sync_block ( ) ......................................................................................................................................................90
1.8.6.16) sync_decimator ( )..............................................................................................................................................90
1.8.6.16) sync_interpolator ( )...........................................................................................................................................90
1.8.6.17) top_block ( ) .........................................................................................................................................................90
1.8.6.18) enable_realtime_scheduling ( ).......................................................................................................................91

1.8.7)

gnuradio/ gr / threading.py ............................................................................................................. 91

1.8.8)

gnuradio/ gr / threading_23.py ...................................................................................................... 91

1.8.9)

gnuradio/ gr / threading_24.py ...................................................................................................... 91

1.8.10)

gnuradio/ gr / hier_block2.py ......................................................................................................... 91

1.8.11)

gnuradio/ gr / hier_block.py ........................................................................................................... 91

1.8.12)

gnuradio/ gr / prefs.py ..................................................................................................................... 92

1.8.13)

gnuradio/ gr / scheduler.py ............................................................................................................ 92

1.8.14)

gnuradio/ gr / top_block.py ............................................................................................................ 92

1.8.15)

gnuradio/ gr / gnuradio_swig_python.py.................................................................................... 92

1.8.16)

gnuradio/ gr / gnuradio_swig_io.py ............................................................................................. 93

1.8.16.1) file_sink_base ( ).................................................................................................................................................93
1.8.16.2) file_sink ( )............................................................................................................................................................93
1.8.16.3) file_source ( ).......................................................................................................................................................93
1.8.16.4) file_descriptor_sink ( ) ......................................................................................................................................94
1.8.16.5) file_descriptor_source ( ) .................................................................................................................................94
1.8.16.6) microtune_xxxx_eval_board ( ).......................................................................................................................94
1.8.16.7) microtune_4702_eval_board ( ).......................................................................................................................94
1.8.16.8) microtune_4937_eval_board ( ).......................................................................................................................94

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1.8.16.8) sdr_1000_base ( ) ...............................................................................................................................................95
1.8.16.9) oscope_sink_f ( ) ................................................................................................................................................95
1.8.16.10) ppio ( ) .................................................................................................................................................................95
1.8.16.11) message_source ( ) .........................................................................................................................................95
1.8.16.12) message_sink ( ) ..............................................................................................................................................95
1.8.16.13) udp_sink ( ) ........................................................................................................................................................96
1.8.16.14) udp_source ( ) ...................................................................................................................................................96

1.8.17)

gnuradio/ gr / gnuradio_swig_general.py................................................................................... 96

1.8.17.1) nop ( ) ....................................................................................................................................................................96
1.8.27.2) null_sink ( )...........................................................................................................................................................97
1.8.27.3) null_source ( ) .....................................................................................................................................................97
1.8.27.4) head ( ) ..................................................................................................................................................................97
1.8.27.5) skiphead ( )...........................................................................................................................................................97
1.8.27.6) quadrature_demod_cf ( ) ..................................................................................................................................97
1.8.27.7) float_to_complex ( ) ...........................................................................................................................................98
1.8.27.8) check_counting_s ( ) .........................................................................................................................................98
1.8.27.9) lfsr_32k_source_s ( ) .........................................................................................................................................98
1.8.27.10) check_lfsr_32k_s ( ).........................................................................................................................................98
1.8.27.11) stream_to_vector ( ).........................................................................................................................................99
1.8.27.12) vector_to_stream ( ).........................................................................................................................................99
1.8.27.13) keep_one_in_n ( ).............................................................................................................................................99
1.8.27.14) fft_vcc ( ).............................................................................................................................................................99
1.8.27.15) fft_vfc ( )..............................................................................................................................................................99
1.8.27.16) float_to_short ( ) .............................................................................................................................................100
1.8.27.17) float_to_uchar ( ) ............................................................................................................................................100
1.8.27.18) short_ to_float ( ) ............................................................................................................................................100
1.8.27.19) char_to_float ( )...............................................................................................................................................100
1.8.27.20) uchar_to_float ( ) ............................................................................................................................................100
1.8.27.21) frequency_modulator_fc ( ) .........................................................................................................................101
1.8.27.22) phase_modulator_fc ( ).................................................................................................................................101
1.8.27.23) bytes_to_syms ( ) ...........................................................................................................................................101
1.8.27.24) simple_framer ( ) ............................................................................................................................................101
1.8.27.25) simple_correlator ( ) ......................................................................................................................................101
1.8.27.26) align_on_samplenumbers_ss ( ) ................................................................................................................102
1.8.27.27) complex_to_float ( ) .......................................................................................................................................102
1.8.27.28) complex_to_real ( ) ........................................................................................................................................102
1.8.27.29) complex_to_imag ( ) ......................................................................................................................................102
1.8.27.30) complex_to_mag ( ) .......................................................................................................................................102
1.8.27.31) complex_to_mag_squared ( )......................................................................................................................103
1.8.27.32) complex_to_arg ( ) .........................................................................................................................................103
1.8.27.33) complex_to_interleaved_short ( ) ..............................................................................................................103
1.8.27.34) interleaved_short_to_complex ( ) ..............................................................................................................103
1.8.27.35) firdes ( ).............................................................................................................................................................103
1.8.27.35.1) firdes.low_pass ( ) .................................................................................................................................103
1.8.27.35.2) firdes.high_pass ( )................................................................................................................................104

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1.8.27.35.3) firdes.band_pass ( ) ..............................................................................................................................104
1.8.27.35.4) firdes.complex_band_pass ( ) ............................................................................................................104
1.8.27.35.5) firdes.band_reject ( ).............................................................................................................................105
1.8.27.35.6) firdes.hilbert ( ) .......................................................................................................................................105
1.8.27.35.7) firdes.root_raised_cosine ( )...............................................................................................................105
1.8.27.35.8) firdes.gaussian ( ) ..................................................................................................................................106
1.8.27.35.9) firdes.window ( ).....................................................................................................................................106
1.8.27.36) interleave () ......................................................................................................................................................106
1.8.27.37) deinterleave ()..................................................................................................................................................106
1.8.27.38) delay () ..............................................................................................................................................................107
1.8.27.39) simple_sequelch_cc () ..................................................................................................................................107
1.8.27.40) agc_xx () ...........................................................................................................................................................107
1.8.27.41) gri_agc_xx ()....................................................................................................................................................107
1.8.27.42) gri_agc2_xx ()..................................................................................................................................................108
1.8.27.43) rms_xx ()...........................................................................................................................................................108
1.8.27.44) nlog10_ff () .......................................................................................................................................................109
1.8.27.45) fake_channel_encoder_pp ().......................................................................................................................109
1.8.27.46) fake_channel_decoder_pp ().......................................................................................................................109
1.8.27.47) throttle ()...........................................................................................................................................................109
1.8.27.48) mpsk_receiver_cc () ......................................................................................................................................109
1.8.27.49) stream_mux () .................................................................................................................................................111
1.8.27.50) stream_to_streams () ....................................................................................................................................111
1.8.27.51) streams_to_stream () ....................................................................................................................................111
1.8.27.52) streams_to_vector () .....................................................................................................................................111
1.8.27.53) stream_to_vector ()........................................................................................................................................111
1.8.27.54) vector_to_ streams () ....................................................................................................................................112
1.8.27.55) vector_to_stream ()........................................................................................................................................112
1.8.27.56) conjugate_cc () ...............................................................................................................................................112
1.8.27.57) vco_f () ..............................................................................................................................................................112
1.8.27.58) threshold_ff ()..................................................................................................................................................112
1.8.27.59) clock_recovery_mm_xx () ............................................................................................................................113
1.8.27.60) dd_mpsk_sync_cc () .....................................................................................................................................113
1.8.27.61) packet_sink ()..................................................................................................................................................114
1.8.27.62) lms_dfe_xx () ...................................................................................................................................................114
1.8.27.63) dpll_bb ()...........................................................................................................................................................114
1.8.27.64) pll_freqdet_cf ()...............................................................................................................................................115
1.8.27.65) pll_refout_cc () ................................................................................................................................................115
1.8.27.66) pll_carriertracking_cc().................................................................................................................................115
1.8.27.67) pn_correlator_cc ().........................................................................................................................................116
1.8.27.68) probe_signal_f () ............................................................................................................................................116
1.8.27.69) probe_avg_mag_sqrd_xx ().........................................................................................................................116
1.8.27.70) ofdm_correlator () ..........................................................................................................................................117
1.8.27.71) ofdm_cyclic_prefixer () .................................................................................................................................117
1.8.27.72) ofdm_bpsk_mapper () ...................................................................................................................................117
1.8.27.73) ofdm_bpsk_demapper () ..............................................................................................................................118

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1.8.27.74) ofdm_ mapper_bcv () ....................................................................................................................................118
1.8.27.75) ofdm_qpsk_mapper () ...................................................................................................................................118
1.8.27.76) ofdm_qam_mapper () ....................................................................................................................................118
1.8.27.77) ofdm_frame_sink ()........................................................................................................................................119
1.8.27.78) ofdm_insert_preamble () ..............................................................................................................................119
1.8.27.79) ofdm_sampler ()..............................................................................................................................................119
1.8.27.80) regenerate_bb () .............................................................................................................................................120
1.8.27.81) costas_loop_cc ()...........................................................................................................................................120
1.8.27.82) pa_2x2_phase_combiner ()..........................................................................................................................120
1.8.27.83) kludge_copy () ................................................................................................................................................121
1.8.27.84) prefs ()...............................................................................................................................................................121
1.8.27.85) test ()..................................................................................................................................................................121
1.8.27.86) unpack_k_bits_bb () ......................................................................................................................................121
1.8.27.87) correlate_access_code_bb () ......................................................................................................................122
1.8.27.88) diff_phasor_cc () ............................................................................................................................................122
1.8.27.89) constellation_decoder_cb ()........................................................................................................................122
1.8.27.90) binary_slicer_fb () ..........................................................................................................................................122
1.8.27.91) diff_encoder_bb ()..........................................................................................................................................123
1.8.27.92) diff_decoder_bb ()..........................................................................................................................................123
1.8.27.93) framer_sink_1 ()..............................................................................................................................................123
1.8.27.94) map_bb () .........................................................................................................................................................123
1.8.27.95) feval ()................................................................................................................................................................123
1.8.27.96) feval_xx ().........................................................................................................................................................124
1.8.27.97) pwr_squelch_xx ()..........................................................................................................................................124
1.8.27.98) squelch_base_xx ()........................................................................................................................................124
1.8.27.99) ctcss_squelch_ff ().........................................................................................................................................125
1.8.27.100) feedforward_agc_cc () ................................................................................................................................125
1.8.27.101) bin_statistics_f ()..........................................................................................................................................126
1.8.27.102) glfsr_source_x () ..........................................................................................................................................126

1.9)

GNURADIO/ WINDOW.PY ................................................................................................................................ 126

1.9.1)

hamming() ......................................................................................................................................... 126

1.9.2)

hanning() ........................................................................................................................................... 127

1.9.3)

welch()................................................................................................................................................ 127

1.9.4)

parzen() .............................................................................................................................................. 127

1.9.5)

bartlett() ............................................................................................................................................. 127

1.9.6)

blackman2() ...................................................................................................................................... 127

1.9.7)

blackman3() ...................................................................................................................................... 128

1.9.8)

blackman4() ...................................................................................................................................... 128

1.9.9)

exponential()..................................................................................................................................... 128

1.9.10)

riemann() ........................................................................................................................................... 128

1.9.11) blackmanharris () .................................................................................................................................. 128
1.9.12)

nuttall()............................................................................................................................................... 128

1.9.13)

kaiser() ............................................................................................................................................... 129

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1.10)

Page 12 of 208

GNURADIO/ VIDEO_SDL.PY ............................................................................................................................ 129

1.10.1)

video_sdl_sink_uc() ....................................................................................................................... 129

1.10.2)

video_sdl_sink_s() .......................................................................................................................... 129

1.10.3)

sink_uc() ............................................................................................................................................ 130

1.10.4)

sink_s() .............................................................................................................................................. 130

1.11)

GNURADIO/ TRELLIS.PY ................................................................................................................................. 130

1.11.1)

fsm().................................................................................................................................................... 130

1.11.2)

interleaver()....................................................................................................................................... 131

1.11.3) trellis_permutation () ........................................................................................................................... 131
1.11.4) trellis_siso_f () ....................................................................................................................................... 131
1.11.5) trellis_encoder_xx () ............................................................................................................................ 131
1.11.6) trellis_metrics_x () ................................................................................................................................ 132
1.11.7) trellis_viterbi_x () .................................................................................................................................. 132
1.11.8) trellis_viterbi_combined_xx () ........................................................................................................... 132
1.12)

GNURADIO/ SOUNDER.PY .............................................................................................................................. 132

1.12.1) sounder_tx ().......................................................................................................................................... 134
1.12.2) sounder_rx ().......................................................................................................................................... 134
1.12.3) sounder ()................................................................................................................................................ 134
1.13)

GNURADIO/ RADAR_MONO.PY ....................................................................................................................... 134

1.13.1) radar_tx ()................................................................................................................................................ 135
1.13.2) radar_rx () ............................................................................................................................................... 135
1.13.3) radar () ..................................................................................................................................................... 135
1.14)

GNURADIO/ RA.PY .......................................................................................................................................... 135

1.15)

GNURADIO/ PACKET_UTIL.PY ........................................................................................................................ 135

1.15.1) conv_packed_binary_string_to_1_0_string ().............................................................................. 135
1.15.2) conv_1_0_string_to_packed_binary_string ().............................................................................. 136
1.15.3) make_packet () ..................................................................................................................................... 136
1.15.4) unmake_packet () ................................................................................................................................ 136
1.15.5) _npadding_bytes () ............................................................................................................................. 137
1.16)

GNURADIO/ OPTFIR.PY ................................................................................................................................... 137

1.16.1) low_pass () ............................................................................................................................................. 137
1.16.2) high_pass ()............................................................................................................................................ 137
1.17)

GNURADIO/ OFDM_PACKET_UTIL.PY ............................................................................................................ 138

1.17.1) conv_packed_binary_string_to_1_0_string ().............................................................................. 138
1.17.2) conv_1_0_string_to_packed_binary_string ().............................................................................. 138
1.17.3) make_packet () ..................................................................................................................................... 138
1.17.4) unmake_packet () ................................................................................................................................ 138

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1.17.5) _npadding_bytes () ............................................................................................................................. 139
1.18)

GNURADIO/ MODULATION_UTILS.PY ............................................................................................................. 139

1.18.1) type_1_mods ()..................................................................................................................................... 139
1.18.2) type_1_demods () ................................................................................................................................ 139
1.19)

GNURADIO/ LOCAL_CALIBRATOR.PY ............................................................................................................ 140

1.20)

GNURADIO/GR_UNITTEST.PY ......................................................................................................................... 140

1.21)

GNURADIO/ENG_OPTION.PY .......................................................................................................................... 140

1.22)

GNURADIO/ENG_NOTATION.PY...................................................................................................................... 140

1.22.1) num_to_str ()......................................................................................................................................... 140
1.22.2) str_to_num ()......................................................................................................................................... 141
1.23)

GNURADIO/AUDIO_OSS.PY ............................................................................................................................ 141

1.24)

GNURADIO/AUDIO_ALSA.PY .......................................................................................................................... 141

1.25)

gnuradio/audio.py................................................................................................................................ 141

1.25.1) source () ................................................................................................................................................. 141
1.25.2) sink () ...................................................................................................................................................... 142
1.26)

GNURADIO/ATSC.PY....................................................................................................................................... 142

1.27)

GNURADIO/USRP.PY ...................................................................................................................................... 142

1.27.1)

source_x() ......................................................................................................................................... 142

1.27.1.1)

tune() ...............................................................................................................................................................142

1.27.1.2)

has_rx_halfband() ........................................................................................................................................143

1.27.1.3)

nddcs()............................................................................................................................................................143

1.27.2)

sink_x() .............................................................................................................................................. 143

1.27.2.1)

tune() ...............................................................................................................................................................143

1.27.2.2)

has_tx_halfband() ........................................................................................................................................144

1.27.2.3)

nducs()............................................................................................................................................................144

1.27.3)

determine_rx_mux_value () .......................................................................................................... 144

1.27.4)

tune_result () .................................................................................................................................... 145

1.27.5)

determine_tx_mux_value () .......................................................................................................... 145

1.27.6)

selected_subdev ().......................................................................................................................... 145

1.27.7)

calc_dxc_freq () ............................................................................................................................... 145

1.27.8)

pick_rx_subdevice() ....................................................................................................................... 146

1.27.9)

pick_tx_subdevice() ....................................................................................................................... 146

1.27.10)
1.28)

pick_ subdev()............................................................................................................................. 146

GNURADIO/USRP1.PY .................................................................................................................................... 147

1.28.1)

source_x() ......................................................................................................................................... 147

1.28.1.1)

set_decim_rate()...........................................................................................................................................147

1.28.1.2)

set_nchannels() ............................................................................................................................................148

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1.28.1.3)

set_mux() .......................................................................................................................................................148

1.28.1.4)

set_rx_freq() ..................................................................................................................................................148

1.28.1.5)

set_ddc_phase()...........................................................................................................................................148

1.28.1.6)

set_fpga_mode()...........................................................................................................................................149

1.28.1.7)

set_verbose() ................................................................................................................................................149

1.28.1.8)

set_pga().........................................................................................................................................................149

1.28.1.9)

pga() ................................................................................................................................................................149

1.28.1.10)

pga_min() ..................................................................................................................................................149

1.28.1.11)

pga_max() .................................................................................................................................................150

1.28.1.12)

pga_db_per_step()..................................................................................................................................150

1.28.1.13)

fpga_master_clock_freq().....................................................................................................................150

1.28.1.14)

converter_rate().......................................................................................................................................150

1.28.1.15)

decim_rate() .............................................................................................................................................150

1.28.1.16)

nchannels()...............................................................................................................................................151

1.28.1.17)

mux() ..........................................................................................................................................................151

1.28.1.18)

rx_freq().....................................................................................................................................................151

1.28.1.19)

daughterboard_id().................................................................................................................................151

1.28.1.20)

write_aux_dac() .......................................................................................................................................151

1.28.1.21)

read_aux_dac()........................................................................................................................................152

1.28.1.22)

write_eeprom().........................................................................................................................................152

1.28.1.23)

read_eeprom() .........................................................................................................................................152

1.28.1.24)

write_i2c() .................................................................................................................................................152

1.28.1.25)

read_i2c() ..................................................................................................................................................153

1.28.1.26)

set_adc_offset().......................................................................................................................................153

1.28.1.27)

set_dac_offset().......................................................................................................................................153

1.28.1.28)

set_adc_buffer_bypass() ......................................................................................................................153

1.28.1.29)

serial_number() .......................................................................................................................................154

1.28.1.30)

_write_oe() ................................................................................................................................................154

1.28.1.31)

write_io() ...................................................................................................................................................154

1.28.1.32)

read_io() ....................................................................................................................................................154

1.28.1.33)

set_dc_offset_cl_enable().....................................................................................................................155

1.28.1.34)

set_format() ..............................................................................................................................................155

1.28.1.35)

make_format()..........................................................................................................................................155

1.28.1.36)

format()......................................................................................................................................................155

1.28.1.37)

format_width() .........................................................................................................................................156

1.28.1.38)

format_shift() ...........................................................................................................................................156

1.28.1.39)

format_want_q() ......................................................................................................................................156

1.28.1.40)

format_bypass_halfband() ...................................................................................................................156

1.28.1.41)

_write_fpga_reg()....................................................................................................................................156

1.28.1.42)

_write_fpga_reg_masked() ...................................................................................................................157

1.28.1.43)

_read_fpga_reg().....................................................................................................................................157

1.28.1.44)

_write_9862()............................................................................................................................................157

1.28.1.45)

_read_9862().............................................................................................................................................157

1.28.1.46)

_write_spi()...............................................................................................................................................158

1.28.1.47)

_read_spi()................................................................................................................................................158

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1.28.2)

1.29)

Page 15 of 208

sink_x() .............................................................................................................................................. 158

1.28.2.1)

set_interp_rate() ...........................................................................................................................................159

1.28.2.2)

set_nchannels() ............................................................................................................................................159

1.28.2.3)

set_mux() .......................................................................................................................................................159

1.28.2.4)

set_tx_freq() ..................................................................................................................................................160

1.28.2.5)

set_verbose() ................................................................................................................................................160

1.28.2.6)

set_pga().........................................................................................................................................................160

1.28.2.7)

pga() ................................................................................................................................................................160

1.28.2.8)

pga_min() .......................................................................................................................................................161

1.28.2.9)

pga_max() ......................................................................................................................................................161

1.28.2.10)

pga_db_per_step()..................................................................................................................................161

1.28.2.11)

fpga_master_clock_freq().....................................................................................................................161

1.28.2.12)

converter_rate().......................................................................................................................................161

1.28.2.13)

interp_rate()..............................................................................................................................................162

1.28.2.14)

nchannels()...............................................................................................................................................162

1.28.2.16)

tx_freq() .....................................................................................................................................................162

1.28.2.17)

daughterboard_id().................................................................................................................................163

1.28.2.18)

write_aux_dac() .......................................................................................................................................163

1.28.2.19)

read_aux_dac()........................................................................................................................................163

1.28.2.20)

write_eeprom().........................................................................................................................................163

1.28.2.21)

read_eeprom() .........................................................................................................................................164

1.28.2.22)

write_i2c() .................................................................................................................................................164

1.28.2.23)

read_i2c() ..................................................................................................................................................164

1.28.2.24)

set_adc_offset().......................................................................................................................................164

1.28.2.25)

set_dac_offset().......................................................................................................................................164

1.28.2.26)

set_adc_buffer_bypass() ......................................................................................................................165

1.28.2.27)

serial_number() .......................................................................................................................................165

1.28.2.28)

_write_oe() ................................................................................................................................................165

1.28.2.29)

write_io() ...................................................................................................................................................165

1.28.2.30)

read_io() ....................................................................................................................................................166

1.28.2.31)

_write_fpga_reg()....................................................................................................................................166

1.28.2.32)

_write_fpga_reg_masked() ...................................................................................................................166

1.28.2.33)

_read_fpga_reg().....................................................................................................................................166

1.28.2.34)

_write_9862()............................................................................................................................................167

1.28.2.35)

_read_9862().............................................................................................................................................167

1.28.2.36)

_write_spi()...............................................................................................................................................167

1.28.2.37)

_read_spi()................................................................................................................................................168

GNURADIO/USRP_MULTI.PY .......................................................................................................................... 168

1.29.1)

multi_source_align () ..................................................................................................................... 169

1.29.1.1)

get_master_usrp ().......................................................................................................................................169

1.29.1.2)

get_slave_usrp ()..........................................................................................................................................169

1.29.1.3)

get_master_source_c ()..............................................................................................................................169

1.29.1.4)

get_slave_source_c ().................................................................................................................................170

1.29.1.5)

sync () .............................................................................................................................................................170

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1.29.1.6)

print_db_info () .............................................................................................................................................170

1.29.1.7)

tune_all_rx ()..................................................................................................................................................170

1.29.1.8)

set_gain_all_rx ()..........................................................................................................................................171

1.30)

GNURADIO/TX_DEBUG_GUI.PY...................................................................................................................... 171

1.31)

GNURADIO/FLEXRF_DEBUG_GUI.PY ............................................................................................................. 171

1.32)

GNURADIO/DB_BASE.PY................................................................................................................................ 171

1.33)

GNURADIO/DB_BASIC.PY............................................................................................................................... 171

1.33.1)

db_basic_tx ()................................................................................................................................... 172

1.33.1.1)

dbid () ..............................................................................................................................................................172

1.33.1.2)

name () ............................................................................................................................................................172

1.33.1.3)

side_and_name ().........................................................................................................................................172

1.33.1.4)

freq_range () ..................................................................................................................................................173

1.33.1.5)

set_freq () .......................................................................................................................................................173

1.33.1.6)

gain_range () .................................................................................................................................................173

1.33.1.7)

set_gain () ......................................................................................................................................................173

1.33.1.8)

is_quadrature () ............................................................................................................................................173

1.33.2)

db_basic_rx () .................................................................................................................................. 174

1.33.2.1)

dbid () ..............................................................................................................................................................174

1.33.2.2)

name () ............................................................................................................................................................174

1.33.2.3)

side_and_name ().........................................................................................................................................174

1.33.2.4)

freq_range () ..................................................................................................................................................175

1.33.2.5)

set_freq () .......................................................................................................................................................175

1.33.2.6)

gain_range () .................................................................................................................................................175

1.33.2.7)

set_gain () ......................................................................................................................................................175

1.33.2.8)

is_quadrature () ............................................................................................................................................176

1.33.3)

db_lf_rx () .......................................................................................................................................... 176

1.33.3.1)

dbid () ..............................................................................................................................................................176

1.33.3.2)

name () ............................................................................................................................................................176

1.33.3.3)

side_and_name ().........................................................................................................................................176

1.33.3.4)

freq_range () ..................................................................................................................................................177

1.33.3.5)

set_freq () .......................................................................................................................................................177

1.33.3.6)

gain_range () .................................................................................................................................................177

1.33.3.7)

set_gain () ......................................................................................................................................................177

1.33.3.8)

is_quadrature () ............................................................................................................................................178

1.33.4)

db_lf_tx () .......................................................................................................................................... 178

1.33.4.1)

dbid () ..............................................................................................................................................................178

1.33.4.2)

name () ............................................................................................................................................................178

1.33.4.3)

side_and_name ().........................................................................................................................................179

1.33.4.4)

freq_range () ..................................................................................................................................................179

1.33.4.5)

set_freq () .......................................................................................................................................................179

1.33.4.6)

gain_range () .................................................................................................................................................179

1.33.4.7)

set_gain () ......................................................................................................................................................179

1.33.4.8)

is_quadrature () ............................................................................................................................................180

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1.34)

GNURADIO/DB_DBS_RX.PY ........................................................................................................................... 180

1.34.1)

1.35)

Page 17 of 208

db_dbs_rx ()...................................................................................................................................... 180

1.34.1.1)

dbid () ..............................................................................................................................................................180

1.34.1.2)

name () ............................................................................................................................................................180

1.34.1.3)

side_and_name ().........................................................................................................................................181

1.34.1.4)

freq_range () ..................................................................................................................................................181

1.34.1.5)

set_freq () .......................................................................................................................................................181

1.34.1.6)

gain_range () .................................................................................................................................................181

1.34.1.7)

set_gain () ......................................................................................................................................................182

1.34.1.8)

is_quadrature () ............................................................................................................................................182

1.34.1.9)

set_bw () .........................................................................................................................................................182

GNURADIO/DB_FLEXRF.PY ............................................................................................................................ 182

GNURADIO/DB_FLEXRF_MIMO.PY ............................................................................................................................... 182

1.35.1)

db_flexrf_xxxx_tx () ........................................................................................................................ 182

db_flexrf_xxxx_tx_mimo_x() ........................................................................................................................... 182
1.35.1.1)

dbid () ..............................................................................................................................................................183

1.35.1.2)

name () ............................................................................................................................................................183

1.35.1.3)

side_and_name ().........................................................................................................................................184

1.35.1.4)

freq_range () ..................................................................................................................................................184

1.35.1.5)

set_freq () .......................................................................................................................................................184

1.35.1.6)

is_quadrature () ............................................................................................................................................185

1.35.1.7)

set_auto_tr () .................................................................................................................................................185

1.35.1.8)

set_enable ()..................................................................................................................................................185

1.35.2)

db_flexrf_xxxx_rx () ........................................................................................................................ 185

db_flexrf_xxxx_rx_mimo_x()........................................................................................................................... 185
1.35.2.1)

dbid () ..............................................................................................................................................................186

1.35.2.2)

name () ............................................................................................................................................................186

1.35.2.3)

side_and_name ().........................................................................................................................................187

1.35.2.4)

freq_range () ..................................................................................................................................................187

1.35.2.5)

set_freq () .......................................................................................................................................................187

1.35.2.6)

gain_range () .................................................................................................................................................188

1.35.2.7)

set_gain () ......................................................................................................................................................188

1.35.2.8)

is_quadrature () ............................................................................................................................................188

1.35.2.9)

set_auto_tr () .................................................................................................................................................188

1.35.2.10)

select_rx_antenna ()...............................................................................................................................189

1.35.2.11)

i_and_q_swapped () ...............................................................................................................................189

1.36)

GNURADIO/DB_INSTANTIATOR.PY ................................................................................................................. 189

1.37)

GNURADIO/DB_TV_RX.PY .............................................................................................................................. 189

1.37.1)

db_tv_rx () ......................................................................................................................................... 190

1.37.1.1)

dbid () ..............................................................................................................................................................190

1.37.1.2)

name () ............................................................................................................................................................190

1.37.1.3)

side_and_name ().........................................................................................................................................190

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1.37.1.4)

freq_range () ..................................................................................................................................................191

1.37.1.5)

set_freq () .......................................................................................................................................................191

1.37.1.6)

gain_range () .................................................................................................................................................191

1.37.1.7)

set_gain () ......................................................................................................................................................191

1.37.1.8)

is_quadrature () ............................................................................................................................................191

1.38)

GNURADIO/DB_WBX.PY ................................................................................................................................. 192

1.38.1)

DB_WBX_LO_RX () ................................................................................................................................... 192

1.38.1.1)

dbid () ..............................................................................................................................................................192

1.38.1.2)

name () ............................................................................................................................................................193

1.38.1.3)

side_and_name ().........................................................................................................................................193

1.38.1.4)

freq_range () ..................................................................................................................................................193

1.38.1.5)

set_freq () .......................................................................................................................................................193

1.38.1.6)

gain_range () .................................................................................................................................................194

1.38.1.7)

set_gain () ......................................................................................................................................................194

1.38.1.8)

is_quadrature () ............................................................................................................................................194

1.38.1.9)

set_auto_tr () .................................................................................................................................................195

1.38.1.10)

select_rx_antenna ()...............................................................................................................................195

1.38.1.11)

i_and_q_swapped () ...............................................................................................................................195

1.38.2)

2)

Page 18 of 208

db_wbx_lo_tx () ............................................................................................................................... 195

1.38.2.1)

dbid () ..............................................................................................................................................................196

1.38.2.2)

name () ............................................................................................................................................................196

1.38.2.3)

side_and_name ().........................................................................................................................................196

1.38.2.4)

freq_range () ..................................................................................................................................................197

1.38.2.5)

set_freq () .......................................................................................................................................................197

1.38.2.6)

is_quadrature () ............................................................................................................................................197

1.38.2.7)

set_auto_tr () .................................................................................................................................................198

1.38.2.8)

set_enable ()..................................................................................................................................................198

USRPM PACKAGE ............................................................................................................................................. 198
2.1)

USRPM/USRP_DBID.PY .................................................................................................................................. 198

2.2)

USRPM/USRP_PRIMS.PY ................................................................................................................................ 199

2.3) USRPM/USRP_FPGA_REGS.PY............................................................................................................................ 199
INDEX.............................................................................................................................................................................. 202

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1) gnuradio package
Description

1.1)

gnuradio/blks sub package

Type
Description

1.1.1)

The main package. All gnuradio stuff are here

Folder
Semi-hideous kludge to import everything in the blksimpl directory into the gnuradio.blks
namespace. This keeps us from having to remember to manually update this file.

gnuradio/blksimpl/am_demod.py

Type
Description
Examples
Note

Python file
AM demodulation block

1.1.1.1) am_demod_cf ( )
Type
Description

Usage
Parameters

Function
Generalized AM demodulation block with audio filtering.This block demodulates a bandlimited, complex down-converted AM channel into the original baseband signal, applying
low pass filtering to the audio output. It produces a float stream in the range [-1.0, +1.0].
blks.am_demod_cf (fg, channel_rate, audio_decim, audio_pass, audio_stop)
fg: flowgraph
channel_rate: incoming sample rate of the AM baseband
type channel_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer
audio_pass: audio low pass filter passband frequency
type audio_pass: float
audio_stop: audio low pass filter stop frequency
type audio_stop: float

1.1.1.2) demod_10k0a3e_cf ()
Type
Description
Usage
Parameters

1.1.2)

Function
AM demodulation block, 10 KHz channel. This block demodulates an AM channel
conformant to 10K0A3E emission standards, such as broadcast band AM transmissions.
blks.demod_10k0a3e_cf(fg, channel_rate, audio_decim)
fg: flowgraph
channel_rate: incoming sample rate of the AM baseband
type channel_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer

gnuradio/blksimpl/channel_model.py

Type
Description
Examples
Note

Python file
Creates a channel model

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1.1.2.1) channel_model ( )
Type
Description

Usage
Parameters
Sub Function 1
Sub Function 2
Sub Function 3

1.1.3)

Function
Creates a channel model that includes:
- AWGN noise power in terms of noise voltage
- A frequency offset in the channel in ratio
- A timing offset ratio to model clock difference (clock rate ratio) (epsilon). It is sample
rate difference between tx and rx
- Multipath taps
blks.channel_model(fg, noise_voltage=0.0, frequency_offset=0.0, epsilon=1.0,
taps=[1.0,0.0])
blks.channel_model.set_noise_voltage(noise_voltage)
blks.channel_model.set_frequency_offset(frequency_offset)
blks.channel_model.set_taps(taps)

gnuradio/blksimpl/cpm.py

Type
Description
Examples
Note

Python file
Continuous Phase modulation.
See gnuradio-examples/python/digital for examples

1.1.3.1) cpm_mod ( )
Type
Description

Usage

Parameters

Function
Hierarchical block for Continuous Phase Modulation.
The input is a byte stream (unsigned char) representing packed bits and the output is
the complex modulated signal at baseband.
See Proakis for definition of generic CPM signals:
s(t)=exp(j phi(t))
phi(t)= 2 pi h int_0^t f(t') dt'
f(t)=sum_k a_k g(t-kT)
(normalizing assumption: int_0^infty g(t) dt = 1/2)
blks.cpm_mod(fg,samples_per_symbol=2,bits_per_symbol=1,
h_numerator=1, h_denominator=2,
cpm_type=0,bt=_def_bt,
symbols_per_pulse=1,
generic_taps
numpy.empty(1), verbose=False, log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud >= 2
type samples_per_symbol: integer
bits_per_symbol: bits per symbol
type bits_per_symbol: integer
h_numerator: numerator of modulation index
type h_numerator: integer
h_denominator: denominator of modulation index (numerator and denominator must
be relative primes)
type h_denominator: integer
cpm_type: supported types are: 0=CPFSK, 1=GMSK, 2=RC, 3=GENERAL
type cpm_type: integer
bt: bandwidth symbol time product for GMSK
type bt: float
symbols_per_pulse: shaping pulse duration in symbols
type symbols_per_pulse: integer
generic_taps: define a generic CPM pulse shape (sum = samples_per_symbol/2)

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type generic_taps: array of floats
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.1.4)

gnuradio/blksimpl/d8psk.py

Type
Description
Examples
Note

Python file
differential 8PSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.1.4.1) d8psk_mod ( )
Type
Description
Usage

Parameters

Function , D8PSK modulator
Hierarchical block for RRC-filtered QPSK modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks.d8psk_mod(fg,
samples_per_symbol=3,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.1.4.2) d8psk_demod ( )
Type
Description

Usage

Function , D8PSK demodulator
Differentially coherent detection of differentially encoded 8psk. Hierarchical block for RRCfiltered DQPSK demodulation. The input is the complex modulated signal at baseband. The
output is a stream of bits packed 1 bit per byte (LSB)
blks.d8psk_demod(fg,
samples_per_symbol=3,
excess_bw=.35,
costas_alpha=.175,
gain_mu=.175,
mu=0.5,
omega_relative_limit=.005,
gray_code=True,
verbose=False,
log=False)

Simple Gnuradio User Manual

Parameters

1.1.5)

Page 22 of 208

fg: flow graph
type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: float
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
costas_alpha: loop filter gain
type costas_alpha: float
gain_mu: for M&M block
type gain_mu: float
mu: for M&M block
type mu: float
omega_relative_limit: for M&M block
type omega_relative_limit: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print demodulation data to files?
type debug: bool

gnuradio/blksimpl/dbpsk.py

Type
Description
Examples
Note

Python file
differential BPSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.1.5.1) dbpsk_mod ( )
Type
Description
Usage

Parameters

Function , DBPSK modulator
Hierarchical block for RRC-filtered BPSK modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks.dbpsk_mod(fg,
samples_per_symbol=2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
log: Log modulation data to files?
type log: bool

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1.1.5.2) dbpsk_demod ( )
Type
Description

Usage

Parameters

1.1.6)

Function , DBPSK demodulator
Differentially coherent detection of differentially encoded BPSK. Hierarchical block for RRCfiltered DBPSK demodulation. The input is the complex modulated signal at baseband. The
output is a stream of bits packed 1 bit per byte (LSB).
blks.d8psk_demod(fg,
samples_per_symbol=2,
excess_bw=.35,
costas_alpha=.1,
gain_mu=None,
mu=0.5,
omega_relative_limit=.005,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: float
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
costas_alpha: loop filter gain
type costas_alpha: float
gain_mu: for M&M block
type gain_mu: float
mu: for M&M block
type mu: float
omega_relative_limit: for M&M block
type omega_relative_limit: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print demodulation data to files?
type debug: bool

gnuradio/blksimpl/dqpsk.py

Type
Description
Examples
Note

Python file
differential QPSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.1.6.1) dqpsk_mod ( )
Type
Description
Usage

Parameters

Function , DQPSK modulator
Hierarchical block for RRC-filtered QPSK modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks.dqpsk_mod(fg,
samples_per_symbol=2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
fg: flow graph

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type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.1.6.2) dqpsk_demod ( )
Type
Description

Usage

Parameters

1.1.7)

Function , DQPSK demodulator
Differentially coherent detection of differentially encoded QPSK. Hierarchical block for RRCfiltered DQPSK demodulation. The input is the complex modulated signal at baseband. The
output is a stream of bits packed 1 bit per byte (LSB)
blks.d8psk_demod(fg,
samples_per_symbol=2,
excess_bw=.35,
costas_alpha=.15,
gain_mu=None,
mu=0.5,
omega_relative_limit=.005,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: float
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
costas_alpha: loop filter gain
type costas_alpha: float
gain_mu: for M&M block
type gain_mu: float
mu: for M&M block
type mu: float
omega_relative_limit: for M&M block
type omega_relative_limit: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

gnuradio/blksimpl/filterbank.py

Type
Description
Examples
Note

Python file
Include Both Filter Synthesis and Analysis
See gnuradio-examples/python/usrp folder

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1.1.7.1) synthesis_filterbank ( )
Type
Description

Function
Uniformly modulated polyphase DFT filter bank: synthesis
See http://cnx.rice.edu/content/m10424/latest
Takes M complex streams in, produces single complex stream out that runs at M times the
input sample rate
The channel spacing is equal to the input sample rate.
The total bandwidth and output sample rate are equal the
input sample rate * nchannels.
Output stream to frequency mapping:
channel zero is at zero frequency.
if mpoints is odd:
Channels with increasing positive frequencies come from
channels 1 through (N-1)/2.
Channel (N+1)/2 is the maximum negative frequency, and
frequency increases through N-1 which is one channel lower
than the zero frequency.
if mpoints is even:
Channels with increasing positive frequencies come from
channels 1 through (N/2)-1.
Channel (N/2) is evenly split between the max positive
and negative bins.

Usage
Parameters

Example

Channel (N/2)+1 is the maximum negative frequency, and
frequency increases through N-1 which is one channel lower
than the zero frequency.
Channels near the frequency extremes end up getting cut
off by subsequent filters and therefore have diminished
utility.
blks.synthesis_filterbank (fg, mpoints, taps=None)
fg:
flow_graph
mpoints: number of freq bins/interpolation factor/subbands
taps: filter taps for subband filter
See ayfabtu.py

1.1.7.2) analysis_filterbank ( )
Type
Description

Usage
Parameters

Examples

Function
Uniformly modulated polyphase DFT filter bank: analysis
See http://cnx.rice.edu/content/m10424/latest
Takes 1 complex stream in, produces M complex streams out that runs at 1/M times the
input sample rate. Same channel to frequency mapping as described in filter synthesis.
blks.analysis_filterbank (fg, mpoints,taps)
fg:
flow_graph
mpoints: number of freq bins/interpolation factor/subbands
taps: filter taps for subband filter
See test_dft_analysis

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1.1.8)

Page 26 of 208

gnuradio/blksimpl/fm_demod.py

Type
Description
Examples
Note

Python file
FM demodulation block

1.1.8.1) fm_demod_cf ( )
Type
Description

Usage
Parameters

Function
Generalized FM demodulation block with deemphasis and audio filtering.This block
demodulates a band-limited, complex down-converted FM channel into the original baseband
signal, optionally applying deemphasis. Low pass filtering is done on the resultant signal. It
produces an output float stream in the range of [-1.0, +1.0].
blks.fm_demod_cf (fg, channel_rate, audio_decim, deviation,
audio_pass, audio_stop, gain=1.0, tau=75e-6)
fg: flowgraph
channel_rate: incoming sample rate of the FM baseband
type sample_rate: integer
deviation: maximum FM deviation (default = 5000)
type deviation: float
audio_decim: input to output decimation rate
type audio_decim: integer
audio_pass: audio low pass filter passband frequency
type audio_pass: float
audio_stop: audio low pass filter stop frequency
type audio_stop: float
gain: gain applied to audio output (default = 1.0)
type gain: float
tau: deemphasis time constant (default = 75e-6), specify 'None' to prevent deemphasis

1.1.8.2) demod_20k0f3e_cf ()
Type
Description
Usage
Parameters

Function
NBFM demodulation block, 20 KHz channels
blks.demod_20k0f3e_cf(fg, channel_rate, audio_decim)
fg: flowgraph
sample_rate: incoming sample rate of the FM baseband
type sample_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer

1.1.8.3) demod_200kf3e_cf ()
Type
Description

Usage
Parameters

Function
WFM demodulation block, mono. This block demodulates a complex, down converted,
wideband FM channel conforming to 200KF3E emission standards, outputting floats in the
range [-1.0, +1.0].
blks.demod_200kf3e_cf(fg, channel_rate, audio_decim)
fg: flowgraph
sample_rate: incoming sample rate of the FM baseband
type sample_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer

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1.1.9)

Page 27 of 208

gnuradio/blksimpl/fm_emph.py

Type
Description
Examples
Note

Python file
FM deemphasis and preemphasis IIR filter

1.1.9.1) fm_deemph ( )
Type
Description

Usage
Parameters

Function
FM Deemphasis IIR filter.
1
H(s) = ------1+s
tau is the RC time constant.
critical frequency: w_p = 1/tau
We prewarp and use the bilinear z-transform to get our IIR coefficients.
See "Digital Signal Processing: A Practical Approach" by Ifeachor and Jervis
blks.fm_deemph(fg, fs, tau=75e-6)
fg: flow graph
type fg: gr.flow_graph
fs: sampling frequency in Hz
type fs: float
tau: Time constant in seconds (75us in US, 50us in EUR)
type tau: float

1.1.9.2) fm_preemph ()
Type
Description

Function
FM Preemphasis IIR filter.
1 + s*t1
H(s) = ---------1 + s*t2
I think this is the right transfer function.
This fine ASCII rendition is based on Figure 5-15
in "Digital and Analog Communication Systems", Leon W. Couch II
R1
+-----||------+
|
|
o------+
+-----+--------o
|
C1 | |
+----/\/\/\/--+ \
/
\ R2
/
\
|
o--------------------------+--------o
f1 = 1/(2*pi*t1) = 1/(2*pi*R1*C)

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1
R1 + R2
f2 = ------- = -----------2*pi*t2 2*pi*R1*R2*C
t1 is 75us in US, 50us in EUR
f2 should be higher than our audio bandwidth.
The Bode plot looks like this:
/---------------/
/ <-- slope = 20dB/decade
/
-------------/
f1 f2

Usage
Parameters

We prewarp and use the bilinear z-transform to get our IIR coefficients.
See "Digital Signal Processing: A Practical Approach" by Ifeachor and Jervis
blks.fm_deemph(fg, fs, tau=75e-6)
fg: flow graph
type fg: gr.flow_graph
fs: sampling frequency in Hz
type fs: float
tau: Time constant in seconds (75us in US, 50us in EUR)
type tau: float

1.1.10) gnuradio/blksimpl/gmsk.py
Type
Description
Examples
Note

Python file
differential QPSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.1.10.1) gmsk_mod ( )
Type
Description
Usage

Parameters

Function , GMSK modulator
Hierarchical block for Gaussian Minimum Shift Key (GMSK) modulation. The input is a byte
stream (unsigned char) and the output is the complex modulated signal at baseband.
blks.gmsk_mod(fg, samples_per_symbol =2,
bt=.35,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud >= 2
type samples_per_symbol: integer
bt: Gaussian filter bandwidth * symbol time
type bt: float
verbose: Print information about modulator?
type verbose: bool

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debug: Print modulation data to files?
type debug: bool

1.1.10.2) gmsk_demod ( )
Type
Description

Usage

Parameters

Function , GMSK demodulator
Hierarchical block for Gaussian Minimum Shift Key (GMSK) demodulation. The input is the
complex modulated signal at baseband. The output is a stream of bits packed 1 bit per byte
(the LSB)
blks.gmsk_demod(fg,
samples_per_symbol=2,
gain_mu=None,
mu=0.5,
omega_relative_limit=0.005,
freq_error=0.0,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?
type log: bool
Clock recovery parameters. These all have reasonable defaults.
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)
freq_error: bit rate error as a fraction
type freq_error :float

1.1.11) gnuradio/blksimpl/nbfm_rx.py
Type
Description
Examples
Note

Python file
Narrow Band FM Receiver

1.1.11.1) nbfm_rx ( )
Type
Description
Usage
Parameters

Function
Narrow Band FM Receiver. Takes a single complex baseband input stream and produces a
single float output stream of audio sample in the range [-1, +1].
blks.nbfm_rx(fg, audio_rate, quad_rate, tau=75e-6, max_dev=5e3)
fg: flow graph
audio_rate: sample rate of audio stream, >= 16k
type audio_rate: integer
quad_rate: sample rate of output stream, quad_rate must be an integer multiple of
audio_rate.
type quad_rate: integer
tau: preemphasis time constant (default 75e-6)
type tau: float
max_dev: maximum deviation in Hz (default 5e3)
type max_dev: float

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1.1.12) gnuradio/blksimpl/nbfm_tx.py
Type
Description
Examples
Note

Python file
Narrow Band FM Transmitter

1.1.12.1) nbfm_tx ( )
Type
Description
Usage
Parameters

Function
Narrow Band FM Transmitter. Takes a single float input stream of audio samples in the
range [-1,+1] and produces a single FM modulated complex baseband output.
blks.nbfm_tx (fg, audio_rate, quad_rate, tau=75e-6, max_dev=5e3)
fg: flow graph
audio_rate: sample rate of audio stream, >= 16k
type audio_rate: integer
quad_rate: sample rate of output stream, quad_rate must be an integer multiple of
audio_rate
type quad_rate: integer
tau: preemphasis time constant (default 75e-6)
type tau: float
max_dev: maximum deviation in Hz (default 5e3)
type max_dev: float

1.1.13) gnuradio/blksimpl/ofdm.py
Type
Description
Examples
Note

Python file
OFDM mod/demod with packets as i/o

1.1.13.1) ofdm_mod ( )
Type
Description

Usage
Parameters

Sub Function
Description
Parameters

Function
Modulates an OFDM stream. Based on the options fft_length, occupied_tones, and
cp_length, this block creates OFDM symbols using a specified modulation option. Send
packets by calling send_pkt Hierarchical block for sending packets. Packets to be sent are
enqueued by calling send_pkt. The output is the complex modulated signal at baseband.
blks.ofdm_mod (fg, options, msgq_limit=2, pad_for_usrp=True)
fg: flow graph
type fg: flow graph
options: pass modulation options from higher layers (fft length, occupied tones, etc.)
msgq_limit: maximum number of messages in message queue
type msgq_limit: int
pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
Blks.ofdm_mod.send_pkt(payload, eof=False)
Send the payload
payload: data to send
type payload: string
eof : To signal end of transmission
Type eof : Bool True or False

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1.1.13.2) ofdm_demod ( )
Type
Description

Usage
Parameters

Function
Demodulates a received OFDM stream. Based on the options fft_length, occupied_tones,
and cp_length, this block performs synchronization, FFT, and demodulation of incoming
OFDM symbols and passes packets up the a higher layer. The input is complex baseband.
When packets are demodulated, they are passed to the app via the callback. Hierarchical
block for demodulating and deframing packets.The input is the complex modulated signal at
baseband. Demodulated packets are sent to the handler.
blks.ofdm_demod (fg, options, callback=None)
fg: flow graph
type fg: flow graph
options: pass modulation options from higher layers (fft length, occupied tones, etc.)
callback: function of two args: ok, payload
type callback: ok: bool; payload: string

1.1.14) gnuradio/blksimpl/ofdm_sync_fixed.py
Type
Description
Examples

Python file
OFDM synchronizer

1.1.14.1) ofdm_sync_fixed ( )
Type
Description
Usage
Parameters
Note

Function
Use a fixed trigger point instead of sync block
blks.ofdm_sync_fixed(fg, fft_length, cp_length, snr)
Needs more documentaion

1.1.15) gnuradio/blksimpl/ofdm_sync_ml.py
Type
Description
Examples

Python file
Maximum Likelihood OFDM synchronizer

1.1.15.1) ofdm_sync_ml ( )
Type
Description

Usage
Parameters
Note

Function
Maximum Likelihood OFDM synchronizer:
J. van de Beek, M. Sandell, and P. O. Borjesson, "ML Estimation
of Time and Frequency Offset in OFDM Systems," IEEE Trans.
Signal Processing, vol. 45, no. 7, pp. 1800-1805, 1997.
blks.ofdm_sync_ml(fg, fft_length, cp_length, snr, logging)
Needs more documentation

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1.1.16) gnuradio/blksimpl/ofdm_sync_pn.py
Type
Description
Examples

Python file
OFDM synchronization using PN Correlation

1.1.16.1) ofdm_sync_pn ( )
Type
Description

Usage
Parameters
Note

Function
OFDM synchronization using PN Correlation:
T. M. Schmidl and D. C. Cox, "Robust Frequency and Timing
Synchonization for OFDM," IEEE Trans. Communications, vol. 45, no. 12, 1997.Signal
Processing, vol. 45, no. 7, pp. 1800-1805, 1997.
blks.ofdm_sync_pn(fg, fft_length, cp_length, logging=False)
Needs more documentation

1.1.17) gnuradio/blksimpl/ofdm_sync_pnac.py
Type
Description
Examples

Python file
OFDM synchronization using PN Autocorrelation

1.1.17.1) ofdm_sync_pnac ( )
Type
Description
Usage
Parameters
Note

Function
OFDM synchronization using Autocorrelation PN
blks.ofdm_sync_pnac(fg, fft_length, cp_length, ks)
Needs more documentation

1.1.18) gnuradio/blksimpl/ofdm_receiver.py
Type
Description
Examples
Note

Python file
OFDM Receiver
Needs more documentation

1.1.18.1) ofdm_receiver ( )
Type
Description
Usage
Parameters
Note

Function
blks.ofdm_receiver(fg, fft_length, cp_length, occupied_tones, snr, ks, logging=False)
Needs more documentation

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1.1.19) gnuradio/blksimpl/pkt.py
Type
Description

Python file
mod/demod with packets as i/o (sending packets and demodulating /deframing
packets)

Examples
Note

1.1.19.1) mod_pkts ( )
Type
Description

Usage
Parameters

Sub Function
Description
Parameters

Function
Wrap an arbitrary digital modulator in our packet handling framework.Send packets by calling
send_pkt. Hierarchical block for sending packets.Packets to be sent are enqueued by calling
send_pkt.The output is the complex modulated signal at baseband.
blks.mod_pkts(fg, modulator, access_code=None, msgq_limit=2, pad_for_usrp=True,
use_whitener_offset=False)
fg: flow graph
type fg: flow graph
modulator: instance of modulator class (gr_block or hier_block)
type modulator: complex baseband out
access_code: AKA sync vector
type access_code: string of 1's and 0's between 1 and 64 long
msgq_limit: maximum number of messages in message queue
type msgq_limit: int
pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
use_whitener_offset: If true, start of whitener XOR string is incremented each packet
see gmsk_mod for remaining parameters
blks.mod_pkts.send_pkt(payload, eof=False)
Send the payload
payload: data to send
type payload: string
eof : To signal end of transmission
Type eof : Bool True or False

1.1.19.1) demod_pkts ( )
Type
Description

Usage
Parameters

Function
Wrap an arbitrary digital demodulator in our packet handling framework. The input is complex
baseband. When packets are demodulated, they are passed to the app via the callback.
Hierarchical block for demodulating and deframing packets. The input is the complex
modulated signal at baseband. Demodulated packets are sent to the handler.
blks.demod_pkts(fg,demodulator,access_code=None,callback=None, threshold=-1)
fg: flow graph
type fg: flow graph
demodulator: instance of demodulator class (gr_block or hier_block)
type demodulator: complex baseband in
access_code: AKA sync vector
type access_code: string of 1's and 0's
callback: function of two args: ok, payload
type callback: ok: bool; payload: string
threshold: detect access_code with up to threshold bits wrong (-1 -> use default)
type threshold: int

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1.1.20) gnuradio/blksimpl/psk.py
Type
Description
Examples
Note

Python file
Define different kinds of constellations for Tx and Rx for the PSK (BPSK, QPSK,
8PSK)
Needs more Documentation

1.1.21) gnuradio/blksimpl/qam.py
Type
Description
Examples
Note

Python file
Define different kinds of constellations for Tx and Rx for the QAM
(QAM4,QAM8,QAM16,QAM64,QAM256)
Needs more Documentation

1.1.22) gnuradio/blksimpl/qam8.py
Type
Description
Examples
Note

Python file
QAM8 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.1.22.1) qam8_mod ( )
Type
Description
Usage

Parameters

Function QAM8 modulator
Hierarchical block for RRC-filtered QAM8 modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks.qam8_mod(fg, samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.1.22.2) qam8_demod ( )
Type
Description

Function , QAM8 demodulator
Hierarchical block for QAM8 demodulation. The input is the complex modulated signal at

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Parameters

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baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks.qam8_demod(fg,
samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?
type log: bool
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.1.23) gnuradio/blksimpl/qam16.py
Type
Description
Examples
Note

Python file
QAM16 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.1.23.1) qam16_mod ( )
Type
Description
Usage

Parameters

Function QAM16 modulator
Hierarchical block for QAM16 modulation. The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
blks.qam16_mod(fg, samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

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1.1.23.2) qam16_demod ( )
Type
Description
Usage

Parameters

Function , QAM16 demodulator
Hierarchical block for QAM16 demodulation. The input is the complex modulated signal at
baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks.qam16_demod(fg,
samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?
type log: bool
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.1.24) gnuradio/blksimpl/qam64.py
Type
Description
Examples
Note

Python file
QAM64 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.1.24.1) qam64_mod ( )
Type
Description
Usage

Parameters

Function QAM64 modulator
Hierarchical block for QAM64 modulation. The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
blks.qam64_mod(fg, samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float

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gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.1.24.2) qam64_demod ( )
Type
Description
Usage

Parameters

Function , QAM64 demodulator
Hierarchical block for QAM64 demodulation. The input is the complex modulated signal at
baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks.qam64_demod(fg,
samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?
type log: bool
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.1.25) gnuradio/blksimpl/qam256.py
Type
Description
Examples
Note

Python file
QAM256 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.1.25.1) qam256_mod ( )
Type
Description
Usage

Parameters

Function QAM256 modulator
Hierarchical block for QAM256 modulation. The input is a byte stream (unsigned char) and
the output is the complex modulated signal at baseband.
blks.qam256_mod(fg, samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
fg: flow graph

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type fg: flow graph
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.1.25.2) qam256_demod ( )
Type
Description
Usage

Parameters

Function , QAM256 demodulator
Hierarchical block for QAM256 demodulation. The input is the complex modulated signal at
baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks.qam256_demod(fg,
samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
fg: flow graph
type fg: flow graph
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?
type log: bool
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.1.26) gnuradio/blksimpl/rational_resampler.py
Type
Description
Examples
Note

Python file
Rational resample polyphase FIR filter

1.1.26.1) rational_resampler ( )
Type
Description

Function
rational_resampler_fff :Rational resampling polyphase FIR filter with float input, float output
and float taps.
rational_resampler_ccf : Rational resampling polyphase FIR filter with complex input,
complex output and float taps.

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Parameters

Note

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rational_resampler_ccc : Rational resampling polyphase FIR filter with complex input,
complex output and complex taps.
blks.rational_resampler_xxx(fg,interpolation,
decimation,
taps=None,
fractional_bw=None)
fg: flow graph
interpolation: interpolation factor
type interpolation: integer > 0
decimation: decimation factor
type decimation: integer > 0
taps: optional filter coefficients see blks.filter_design
type taps: sequence
fractional_bw: fractional bandwidth in (0, 0.5), measured at final freq (use 0.4)
type fractional_bw: float
Either taps or fractional_bw may be specified, but not both.
If neither is specified, a reasonable default, 0.4, is used as the fractional_bw.

1.1.26.2) design_filter ( )
Type
Description
Usage
Parameters

Function
Given the interpolation rate, decimation rate and a fractional bandwidth, design a set of taps.
returns: sequence of numbers
blks.design_filter(design_filter(interpolation,decimation, fractional_bw)
interpolation: interpolation factor
type interpolation: integer > 0
decimation: decimation factor
type decimation: integer > 0
fractional_bw: fractional bandwidth in (0, 0.5) 0.4 works well.
type fractional_bw: float

1.1.27) gnuradio/blksimpl/standard_squelch.py
Type
Description
Examples
Note

Python file
Implement the squelch function
Needs more Documentation

1.1.27.1) standard_squelch ( )
Type
Description
Usage
Parameters
Sub Function 1
Description
Sub Function 2
Description
Sub Function 3
Description

Function
Implement the squelch function with 100msec time constant.
blks.standard_squelch(fg, audio_rate)
fg: flow graph
audio_rate : Sample rate of audio stream
blks. standard_squelch.set_threshold(threshold)
Set Squelch Threshold value
blks. standard_squelch.threshold()
Return Squelch Threshold value
blks. standard_squelch.squelch_range()
Return Squelch range

1.1.28) gnuradio/blksimpl/wfm_rcv.py
Type
Description

Python file
Demodulating a broadcast FM signal with a deemphasis

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Examples
Note

1.1.28.1) wfm_rcv ( )
Type
Description
Usage
Parameters

Function
Hierarchical block for demodulating a broadcast FM signal. The input is the down converted
complex baseband signal (gr_complex).The output is the demodulated audio (float).
blks.wfm_rcv(fg, quad_rate, audio_decimation)
fg: flow graph.
type fg: flow graph
quad_rate: input sample rate of complex baseband input.
type quad_rate: float
audio_decimation: how much to decimate quad_rate to get to audio.
type audio_decimation: integer

1.1.29) gnuradio/blksimpl/wfm_rcv_pll.py
Type
Description
Examples
Note

Python file
Stereo demodulating a broadcast FM signal with a deemphasis

1.1.29.1) wfm_rcv_pll ( )
Type
Description

Usage
Parameters

Function
Hierarchical block for demodulating a broadcast FM signal. The input is the down converted
complex baseband signal (gr_complex).The output is two streams of the demodulated audio
(float) 0=Left, 1=Right.
blks.wfm_rcv_pll(fg, demod_rate, audio_decimation)
fg: flow graph.
type fg: flow graph
demod_rate: input sample rate of complex baseband input.
type demod_rate: float
audio_decimation: how much to decimate demod_rate to get to audio.
type audio_decimation: integer

1.1.30) gnuradio/blksimpl/wfm_tx.py
Type
Description
Examples
Note

Python file
Wide Band FM Transmitter with a preemphasis

1.1.30.1) wfm_tx ( )
Type
Description
Usage

Function
Wide Band FM Transmitter. Takes a single float input stream of audio samples in the range [1,+1]and produces a single FM modulated complex baseband output.
blks. wfm_tx(fg, audio_rate, quad_rate, tau=75e-6, max_dev=75e3)

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fg: flow graph
audio_rate: sample rate of audio stream, >= 16k
type audio_rate: integer
quad_rate: sample rate of output stream, quad_rate must be an integer multiple of
audio_rate.
type quad_rate: integer
tau: preemphasis time constant (default 75e-6)
type tau: float
max_dev: maximum deviation in Hz (default 75e3)
type max_dev: float

1.1.31) gnuradio/blksimpl/cvsd.py
Type
Description
Examples
Note

Python file
CVSD encoder and decoder
Needs more documentation

1.1.31.1) cvsd_encode ( )
Type
Description

Usage
Parameters

Function
This is a wrapper for the CVSD encoder that performs interpolation and filtering necessary to
work with the vocoding. It converts an incoming float (+-1) to a short, scales it (to 32000;
slightly below the maximum value), interpolates it, and then vocodes it.
The incoming sampling rate can be anything, though, of course, the higher the sampling rate
and thehigher the interpolation rate are, the better the sound quality. When using the CVSD
vocoder, appropriate sampling rates are from 8k to 64k with resampling rates from 1 to 8. A
rate of 8k with a resampling rate of 8 provides a good quality signal.
blks2. cvsd_encode(resample=8, bw=0.5)

1.1.31.2) cvsd_decode ( )
Type
Description

Usage
Parameters

1.2)

Function
This is a wrapper for the CVSD decoder that performs decimation and filtering necessary to
work with the vocoding. It converts an incoming CVSD-encoded short to a float, decodes it to
a float, decimates it, and scales it (by 32000; slightly below the maximum value to avoid
clipping). The sampling rate can be anything, though, of course, the higher the sampling rate
and the higher the interpolation rate are, the better the sound quality. When using the CVSD
vocoder, appropriate sampling rates are from 8k to 64k with resampling rates from 1 to 8. A
rate of 8k with a resampling rate of 8 provides a good quality signal.
blks2. cvsd_decode(resample=8, bw=0.5)

gnuradio/blks2 sub package

Type
Description

Folder
Semi-hideous kludge to import everything in the blk2simpl directory into the gnuradio.blks2
namespace. The blocks were implemented using hier_block2.

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gnuradio/blks2impl/am_demod.py

Type
Description
Examples
Note

Python file
AM demodulation block

1.2.1.1) am_demod_cf ( )
Type
Description

Usage
Parameters

Function
Generalized AM demodulation block with audio filtering. This block demodulates a bandlimited, complex down-converted AM channel into the the original baseband signal,
applying low pass filtering to the audio output. It produces a float stream in the range [-1.0,
+1.0].
blks2.am_demod_cf (channel_rate, audio_decim, audio_pass, audio_stop)
channel_rate: incoming sample rate of the AM baseband
type sample_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer
audio_pass: audio low pass filter passband frequency
type audio_pass: float
audio_stop: audio low pass filter stop frequency
type audio_stop: float

1.2.1.2) demod_10k0a3e_cf()
Type
Description
Usage
Parameters

1.2.2)

Function
AM demodulation block, 10 KHz channel.This block demodulates an AM channel conformant
to 10K0A3E emission standards, such as broadcast band AM transmissions.
blks2.demod_10k0a3e_cf(channel_rate, audio_decim)
channel_rate: incoming sample rate of the AM baseband
type sample_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer

gnuradio/blks2impl/channel_model.py

Type
Description
Examples
Note

Python file
Creates a channel model

1.2.2.1) channel_model ( )
Type
Description

Function
Creates a channel model that includes:
- AWGN noise power in terms of noise voltage

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- A frequency offset in the channel in ratio
- A timing offset ratio to model clock difference (clock rate ratio) (epsilon). It is sample
rate difference between tx and rx
- Multipath taps
blks2.channel_model(noise_voltage=0.0,
frequency_offset=0.0,
epsilon=1.0,
taps=[1.0,0.0])

Usage
Parameters
Sub Function 1
Sub Function 2
Sub Function 3

1.2.3)

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blks2.channel_model.set_noise_voltage(noise_voltage)
blks2.channel_model.set_frequency_offset(frequency_offset)
blks2.channel_model.set_taps(taps)

gnuradio/blks2impl/cpm.py

Type
Description
Examples
Note

Python file
Continuous Phase modulation.
See gnuradio-examples/python/digital for examples

1.2.3.1) cpm_mod ( )
Type
Description

Usage

Parameters

Function
Hierarchical block for Continuous Phase Modulation.
The input is a byte stream (unsigned char) representing packed bits and the output is
the complex modulated signal at baseband.
See Proakis for definition of generic CPM signals:
s(t)=exp(j phi(t))
phi(t)= 2 pi h int_0^t f(t') dt'
f(t)=sum_k a_k g(t-kT)
(normalizing assumption: int_0^infty g(t) dt = 1/2)
blks2.cpm_mod(samples_per_symbol=2,bits_per_symbol=1,
h_numerator=1, h_denominator=2,
cpm_type=0,bt=_def_bt,
symbols_per_pulse=1,
generic_taps
numpy.empty(1), verbose=False, log=False)
samples_per_symbol: samples per baud >= 2
type samples_per_symbol: integer
bits_per_symbol: bits per symbol
type bits_per_symbol: integer
h_numerator: numerator of modulation index
type h_numerator: integer
h_denominator: denominator of modulation index (numerator and denominator must
be relative primes)
type h_denominator: integer
cpm_type: supported types are: 0=CPFSK, 1=GMSK, 2=RC, 3=GENERAL
type cpm_type: integer
bt: bandwidth symbol time product for GMSK
type bt: float
symbols_per_pulse: shaping pulse duration in symbols
type symbols_per_pulse: integer
generic_taps: define a generic CPM pulse shape (sum = samples_per_symbol/2)
type generic_taps: array of floats
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

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1.2.4)

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gnuradio/blks2impl/d8psk.py

Type
Description
Examples
Note

Python file
differential 8PSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.2.4.1) d8psk_mod ( )
Type
Description
Usage

Parameters

Function , D8PSK modulator
Hierarchical block for RRC-filtered QPSK modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks2.d8psk_mod(samples_per_symbol=3,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files!
type debug: bool

1.2.4.2) d8psk_demod ( )
Type
Description

Usage

Parameters

Function , D8PSK demodulator
Differentially coherent detection of differentially encoded 8psk. Hierarchical block for RRCfiltered DQPSK demodulation. The input is the complex modulated signal at baseband. The
output is a stream of bits packed 1 bit per byte (LSB)
blks2.d8psk_demod(samples_per_symbol=3,
excess_bw=.35,
costas_alpha=.175,
gain_mu=.175,
mu=0.5,
omega_relative_limit=.005,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: float
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
costas_alpha: loop filter gain
type costas_alpha: float
gain_mu: for M&M block
type gain_mu: float
mu: for M&M block
type mu: float
omega_relative_limit: for M&M block
type omega_relative_limit: float
gray_code: Tell modulator to Gray code the bits

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type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print demodulation data to files?
type debug: bool

1.2.5)

gnuradio/blks2impl/dbpsk.py

Type
Description
Examples
Note

Python file
Differential BPSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.2.5.1) dbpsk_mod ( )
Type
Description
Usage

Parameters

Function , DBPSK modulator
Hierarchical block for RRC-filtered BPSK modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks2.dbpsk_mod(samples_per_symbol=2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per baud >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
log: Log modulation data to files?
type log: bool

1.2.5.2) dbpsk_demod ( )
Type
Description

Usage

Parameters

Function , DBPSK demodulator
Differentially coherent detection of differentially encoded BPSK. Hierarchical block for RRCfiltered DBPSK demodulation. The input is the complex modulated signal at baseband. The
output is a stream of bits packed 1 bit per byte (LSB).
blks2.d8psk_demod(samples_per_symbol=2,
excess_bw=.35,
costas_alpha=.1,
gain_mu=None,
mu=0.5,
omega_relative_limit=.005,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: float
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
costas_alpha: loop filter gain
type costas_alpha: float

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gain_mu: for M&M block
type gain_mu: float
mu: for M&M block
type mu: float
omega_relative_limit: for M&M block
type omega_relative_limit: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print demodulation data to files?
type debug: bool

1.2.6)

gnuradio/blks2impl/dqpsk.py

Type
Description
Examples
Note

Python file
differential QPSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.2.6.1) dqpsk_mod ( )
Type
Description
Usage

Parameters

Function , DQPSK modulator
Hierarchical block for RRC-filtered QPSK modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks2.dqpsk_mod(samples_per_symbol=2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.2.6.2) dqpsk_demod ( )
Type
Description

Usage

Function , DQPSK demodulator
Differentially coherent detection of differentially encoded QPSK. Hierarchical block for RRCfiltered DQPSK demodulation. The input is the complex modulated signal at baseband. The
output is a stream of bits packed 1 bit per byte (LSB)
blks2.d8psk_demod(samples_per_symbol=2,
excess_bw=.35,
costas_alpha=.15,
gain_mu=None,

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Parameters

1.2.7)

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mu=0.5,
omega_relative_limit=.005,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: float
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
costas_alpha: loop filter gain
type costas_alpha: float
gain_mu: for M&M block
type gain_mu: float
mu: for M&M block
type mu: float
omega_relative_limit: for M&M block
type omega_relative_limit: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

gnuradio/blks2impl/filterbank.py

Type
Description
Examples
Note

Python file
Include Both Filter Synthesis and Analysis
See gnuradio-examples/python/usrp folder

1.2.7.1) synthesis_filterbank ( )
Type
Description

Function
Uniformly modulated polyphase DFT filter bank: synthesis
See http://cnx.rice.edu/content/m10424/latest
Takes M complex streams in, produces single complex stream out that runs at M times the
input sample rate
The channel spacing is equal to the input sample rate.
The total bandwidth and output sample rate are equal the
input sample rate * nchannels.
Output stream to frequency mapping:
channel zero is at zero frequency.
if mpoints is odd:
Channels with increasing positive frequencies come from
channels 1 through (N-1)/2.
Channel (N+1)/2 is the maximum negative frequency, and
frequency increases through N-1 which is one channel lower
than the zero frequency.
if mpoints is even:

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Usage
Parameters
Example

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Channels with increasing positive frequencies come from
channels 1 through (N/2)-1.
Channel (N/2) is evenly split between the max positive
and negative bins.
Channel (N/2)+1 is the maximum negative frequency, and
frequency increases through N-1 which is one channel lower
than the zero frequency.
Channels near the frequency extremes end up getting cut
off by subsequent filters and therefore have diminished utility.
blks2.synthesis_filterbank (mpoints, taps=None)
mpoints: Number of freq bins/interpolation factor/subbands
taps: Filter taps for subband filter
See ayfabtu.py

1.2.7.2) analysis_filterbank ( )
Type
Description

Usage
Parameters
Examples

1.2.8)

Function
Uniformly modulated polyphase DFT filter bank: analysis.
See http://cnx.rice.edu/content/m10424/latest
Takes 1 complex stream in, produces M complex streams out that runs at 1/M times the
input sample rate. Same channel to frequency mapping as described in filter synthesis.
blks2.analysis_filterbank ( mpoints,taps)
mpoints: number of freq bins/interpolation factor/subbands
taps: filter taps for subband filter
See test_dft_analysis

gnuradio/blks2impl/fm_demod.py

Type
Description
Examples
Note

Python file
FM demodulation block

1.2.8.1) fm_demod_cf ( )
Type
Description

Usage
Parameters

Function
Generalized FM demodulation block with deemphasis and audio filtering. This block
demodulates a band-limited, complex down-converted FM channel into the original baseband
signal, optionally applying deemphasis. Low pass filtering is done on the resultant signal. It
produces an output float stream in the range of [-1.0, +1.0].
blks2.fm_demod_cf (channel_rate, audio_decim, deviation,
audio_pass, audio_stop, gain=1.0, tau=75e-6)
channel_rate: incoming sample rate of the FM baseband
type sample_rate: integer
deviation: maximum FM deviation (default = 5000)
type deviation: float
audio_decim: input to output decimation rate
type audio_decim: integer
audio_pass: audio low pass filter passband frequency
type audio_pass: float
audio_stop: audio low pass filter stop frequency
type audio_stop: float
gain: gain applied to audio output (default = 1.0)
type gain: float
tau: deemphasis time constant (default = 75e-6), specify 'None' to prevent deemphasis

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1.2.8.2) demod_20k0f3e_cf ()
Type
Description
Usage
Parameters

Function
NBFM demodulation block, 20 KHz channels
blks2.demod_20k0f3e_cf(channel_rate, audio_decim)
sample_rate: incoming sample rate of the FM baseband
type sample_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer

1.2.8.3) demod_200kf3e_cf ()
Type
Description

Usage
Parameters

1.2.9)

Function
WFM demodulation block, mono. This block demodulates a complex, down converted,
wideband FM channel conforming to 200KF3E emission standards, outputting floats in the
range [-1.0, +1.0].
blks2.demod_200kf3e_cf(channel_rate, audio_decim)
sample_rate: incoming sample rate of the FM baseband
type sample_rate: integer
audio_decim: input to output decimation rate
type audio_decim: integer

gnuradio/blks2impl/fm_emph.py

Type
Description
Examples
Note

Python file
FM deemphasis and preemphasis IIR filter

1.2.9.1) fm_deemph ( )
Type
Description

Usage
Parameters

Function
FM Deemphasis IIR filter.
1
H(s) = ------1+s
tau is the RC time constant.
critical frequency: w_p = 1/tau
We prewarp and use the bilinear z-transform to get our IIR coefficients.
See "Digital Signal Processing: A Practical Approach" by Ifeachor and Jervis
blks2.fm_deemph(fs, tau=75e-6)
fs: sampling frequency in Hz
type fs: float
tau: Time constant in seconds (75us in US, 50us in EUR)
type tau: float

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1.2.9.2) fm_preemph ()
Type
Description

Function
FM Preemphasis IIR filter.
1 + s*t1
H(s) = ---------1 + s*t2
I think this is the right transfer function.
This fine ASCII rendition is based on Figure 5-15
in "Digital and Analog Communication Systems", Leon W. Couch II
R1
+-----||------+
|
|
o------+
+-----+--------o
|
C1 | |
+----/\/\/\/--+ \
/
\ R2
/
\
|
o--------------------------+--------o
f1 = 1/(2*pi*t1) = 1/(2*pi*R1*C)
1
R1 + R2
f2 = ------- = -----------2*pi*t2 2*pi*R1*R2*C
t1 is 75us in US, 50us in EUR
f2 should be higher than our audio bandwidth.
The Bode plot looks like this:
/---------------/
/ <-- slope = 20dB/decade
/
-------------/
f1 f2

Usage
Parameters

We prewarp and use the bilinear z-transform to get our IIR coefficients.
See "Digital Signal Processing: A Practical Approach" by Ifeachor and Jervis
blks2.fm_deemph(fs, tau=75e-6)
fs: sampling frequency in Hz
type fs: float
tau: Time constant in seconds (75us in US, 50us in EUR)
type tau: float

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1.2.10) gnuradio/blks2impl/gmsk.py
Type
Description
Examples
Note

Python file
differential QPSK modulation and demodulation
See gnuradio-examples/python/digital for examples

1.2.10.1) gmsk_mod ( )
Type
Description
Usage

Parameters

Function , GMSK modulator
Hierarchical block for Gaussian Minimum Shift Key (GMSK) modulation. The input is a byte
stream (unsigned char) and the output is the complex modulated signal at baseband.
blks2.gmsk_mod(samples_per_symbol =2,
bt=.35,
verbose=False,
log=False)
samples_per_symbol: samples per baud >= 2
type samples_per_symbol: integer
bt: Gaussian filter bandwidth * symbol time
type bt: float
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.2.10.2) gmsk_demod ( )
Type
Description

Usage

Parameters

Function , GMSK demodulator
Hierarchical block for Gaussian Minimum Shift Key (GMSK) demodulation. The input is the
complex modulated signal at baseband. The output is a stream of bits packed 1 bit per byte
(the LSB)
blks2.gmsk_demod(samples_per_symbol=2,
gain_mu=None,
mu=0.5,
omega_relative_limit=0.005,
freq_error=0.0,
verbose=False,
log=False)
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?
type log: bool
Clock recovery parameters. These all have reasonable defaults.
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega

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type omega_relative_limit: float, typically 0.000200 (200 ppm)
freq_error: bit rate error as a fraction
type freq_error :float

1.2.11) gnuradio/blks2impl/nbfm_rx.py
Type
Description
Examples
Note

Python file
Narrow Band FM Receiver

1.2.11.1) nbfm_rx ( )
Type
Description
Usage
Parameters

Function
Narrow Band FM Receiver. Takes a single complex baseband input stream and produces a
single float output stream of audio sample in the range [-1, +1].
blks2.nbfm_rx(audio_rate, quad_rate, tau=75e-6, max_dev=5e3)
audio_rate: sample rate of audio stream, >= 16k
type audio_rate: integer
quad_rate: sample rate of output stream, quad_rate must be an integer multiple of
audio_rate.
type quad_rate: integer
tau: preemphasis time constant (default 75e-6)
type tau: float
max_dev: maximum deviation in Hz (default 5e3)
type max_dev: float

1.2.12) gnuradio/blks2impl/nbfm_tx.py
Type
Description
Examples
Note

Python file
Narrow Band FM Transmitter

1.2.12.1) nbfm_tx ( )
Type
Description
Usage
Parameters

Function
Narrow Band FM Transmitter. Takes a single float input stream of audio samples in the
range [-1,+1] and produces a single FM modulated complex baseband output.
blks2.nbfm_tx (audio_rate, quad_rate, tau=75e-6, max_dev=5e3)
audio_rate: sample rate of audio stream, >= 16k
type audio_rate: integer
quad_rate: sample rate of output stream, quad_rate must be an integer multiple of
audio_rate.
type quad_rate: integer
tau: preemphasis time constant (default 75e-6)
type tau: float
max_dev: maximum deviation in Hz (default 5e3)
type max_dev: float

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1.2.13) gnuradio/blks2impl/ofdm.py
Type
Description
Examples
Note

Python file
OFDM mod/demod with packets as i/o

1.2.13.1) ofdm_mod ( )
Type
Description

Usage
Parameters

Sub Function
Description
Parameters

Function
Modulates an OFDM stream. Based on the options fft_length, occupied_tones, and
cp_length, this block creates OFDM symbols using a specified modulation option. Send
packets by calling send_pkt Hierarchical block for sending packets. Packets to be sent are
enqueued by calling send_pkt. The output is the complex modulated signal at baseband.
blks2.ofdm_mod (options, msgq_limit=2, pad_for_usrp=True)
options: pass modulation options from higher layers (fft length, occupied tones, etc.)
msgq_limit: maximum number of messages in message queue
type msgq_limit: int
pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
blks.ofdm_mod.send_pkt(payload, eof=False)
Send the payload
payload: data to send
type payload: string
eof : To signal end of transmission
Type eof : Bool True or False

1.2.13.2) ofdm_demod ( )
Type
Description

Usage
Parameters

Function
Demodulates a received OFDM stream. Based on the options fft_length, occupied_tones,
and cp_length, this block performs synchronization, FFT, and demodulation of incoming
OFDM symbols and passes packets up the a higher layer. The input is complex baseband.
When packets are demodulated, they are passed to the app via the callback. Hierarchical
block for demodulating and deframing packets. The input is the complex modulated signal at
baseband. Demodulated packets are sent to the handler.
blks2.ofdm_demod (options, callback=None)
options: pass modulation options from higher layers (fft length, occupied tones, etc.)
callback: function of two args: ok, payload
type callback: ok: bool; payload: string

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1.2.14) gnuradio/blks2impl/pkt.py
Type
Description

Python file
mod/demod with packets as i/o (sending packets and demodulating /deframing
packets)

Examples
Note

1.2.14.1) mod_pkts ( )
Type
Description

Usage
Parameters

Sub Function
Description
Parameters

Function
Wrap an arbitrary digital modulator in our packet handling framework. Send packets by
calling send_pkt. Hierarchical block for sending packets. Packets to be sent are enqueued by
calling send_pkt. The output is the complex modulated signal at baseband.
blks2.mod_pkts(modulator, access_code=None, msgq_limit=2, pad_for_usrp=True,
use_whitener_offset=False)
modulator: instance of modulator class (gr_block or hier_block)
type modulator: complex baseband out
access_code: AKA sync vector
type access_code: string of 1's and 0's between 1 and 64 long
msgq_limit: maximum number of messages in message queue
type msgq_limit: int
pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
use_whitener_offset: If true, start of whitener XOR string is incremented each packet
see gmsk_mod for remaining parameters
blks.mod_pkts.send_pkt(payload, eof=False)
Send the payload
payload: data to send
type payload: string
eof : To signal end of transmission
Type eof : Bool True or False

1.2.14.2) demod_pkts ( )
Type
Description

Usage
Parameters

Function
Wrap an arbitrary digital demodulator in our packet handling framework. The input is complex
baseband. When packets are demodulated, they are passed to the app via the callback.
Hierarchical block for demodulating and deframing packets. The input is the complex
modulated signal at baseband. Demodulated packets are sent to the handler.
blks2.demod_pkts(demodulator,access_code=None,callback=None, threshold=-1)
demodulator: instance of demodulator class (gr_block or hier_block)
type demodulator: complex baseband in
access_code: AKA sync vector
type access_code: string of 1's and 0's
callback: function of two args: ok, payload
type callback: ok: bool; payload: string
threshold: detect access_code with up to threshold bits wrong (-1 -> use default)
type threshold: int

1.2.15) gnuradio/blks2impl/psk.py
Type
Description
Examples
Note

Python file
Define different kinds of constellations for Tx and Rx for the PSK (BPSK, QPSK,
8PSK)
Needs more Documentation

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1.2.16) gnuradio/blks2impl/qam.py
Type
Description
Examples
Note

Python file
Define different kinds of constellations for Tx and Rx for the QAM
(QAM4,QAM8,QAM16,QAM64,QAM256)
Needs more Documentation

1.2.17) gnuradio/blks2impl/qam8.py
Type
Description
Examples
Note

Python file
QAM8 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.2.17.1) qam8_mod ( )
Type
Description
Usage

Parameters

Function QAM8 modulator
Hierarchical block for RRC-filtered QAM8 modulation. The input is a byte stream (unsigned
char) and the output is the complex modulated signal at baseband.
blks2.qam8_mod(samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.2.17.2) qam8_demod ( )
Type
Description
Usage

Parameters

Function , QAM8 demodulator
Hierarchical block for QAM8 demodulation. The input is the complex modulated signal at
baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks2.qam8_demod(samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?

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type log: bool
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.2.18) gnuradio/blks2impl/qam16.py
Type
Description
Examples
Note

Python file
QAM16 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.2.18.1) qam16_mod ( )
Type
Description
Usage

Parameters

Function QAM16 modulator
Hierarchical block for QAM16 modulation. The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
blks2.qam16_mod(samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.2.18.2) qam16_demod ( )
Type
Description
Usage

Parameters

Function , QAM16 demodulator
Hierarchical block for QAM16 demodulation. The input is the complex modulated signal at
baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks2.qam16_demod(samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?
type log: bool
gain_mu: controls rate of mu adjustment

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type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.2.19) gnuradio/blks2impl/qam64.py
Type
Description
Examples
Note

Python file
QAM64 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.2.19.1) qam64_mod ( )
Type
Description
Usage

Parameters

Function QAM64 modulator
Hierarchical block for QAM64 modulation. The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
blks2.qam64_mod(samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.2.19.2) qam64_demod ( )
Type
Description
Usage

Parameters

Function , QAM64 demodulator
Hierarchical block for QAM64 demodulation. The input is the complex modulated signal at
baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks2.qam64_demod(samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?

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type log: bool
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.2.20) gnuradio/blks2impl/qam256.py
Type
Description
Examples
Note

Python file
QAM256 modulation and demodulation.
See gnuradio-examples/python/digital for examples
Needs more Documentation

1.2.20.1) qam256_mod ( )
Type
Description
Usage

Parameters

Function QAM256 modulator
Hierarchical block for QAM256 modulation. The input is a byte stream (unsigned char) and
the output is the complex modulated signal at baseband.
blks2.qam256_mod(samples_per_symbol =2,
excess_bw=.35,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per symbol >= 2
type samples_per_symbol: integer
excess_bw: Root-raised cosine filter excess bandwidth
type excess_bw: float
gray_code: Tell modulator to Gray code the bits
type gray_code: bool
verbose: Print information about modulator?
type verbose: bool
debug: Print modulation data to files?
type debug: bool

1.2.20.2) qam256_demod ( )
Type
Description
Usage

Parameters

Function , QAM256 demodulator
Hierarchical block for QAM256 demodulation. The input is the complex modulated signal at
baseband. The output is a stream of bits packed 1 bit per byte (the LSB)
blks2.qam256_demod(samples_per_symbol=2,
excess_bw=.35,
costas_alpha=None,
gain_mu=0.03,
mu=0.05,
omega_relative_limit=0.005,
gray_code=True,
verbose=False,
log=False)
samples_per_symbol: samples per baud
type samples_per_symbol: integer
verbose: Print information about modulator?
type verbose: bool
log: Print modulation data to files?

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type log: bool
gain_mu: controls rate of mu adjustment
type gain_mu: float
mu: fractional delay [0.0, 1.0]
type mu: float
omega_relative_limit: sets max variation in omega
type omega_relative_limit: float, typically 0.000200 (200 ppm)

1.2.21) gnuradio/blks2impl/rational_resampler.py
Type
Description
Examples
Note

Python file
Rational resample polyphase FIR filter

1.2.21.1) rational_resampler ( )
Type
Description

Usage
Parameters

Note

Function
rational_resampler_fff :Rational resampling polyphase FIR filter with float input, float output
and float taps.
rational_resampler_ccf : Rational resampling polyphase FIR filter with complex input,
complex output and float taps.
rational_resampler_ccc : Rational resampling polyphase FIR filter with complex input,
complex output and complex taps.
blks2.rational_resampler_xxx(interpolation,
decimation,
taps=None,
fractional_bw=None)
interpolation: interpolation factor
type interpolation: integer > 0
decimation: decimation factor
type decimation: integer > 0
taps: optional filter coefficients see blks2.design_filter
type taps: sequence
fractional_bw: fractional bandwidth in (0, 0.5), measured at final freq (use 0.4)
type fractional_bw: float
Either taps or fractional_bw may be specified, but not both.
If neither is specified, a reasonable default, 0.4, is used as the fractional_bw.

1.2.21.2) design_filter ( )
Type
Description
Usage
Parameters

Function
Given the interpolation rate, decimation rate and a fractional bandwidth, design a set of taps.
returns: sequence of numbers
blks2.design_filter(design_filter(interpolation,decimation, fractional_bw)
interpolation: interpolation factor
type interpolation: integer > 0
decimation: decimation factor
type decimation: integer > 0
fractional_bw: fractional bandwidth in (0, 0.5) 0.4 works well.
type fractional_bw: float

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1.2.22) gnuradio/blks2impl/standard_squelch.py
Type
Description
Examples
Note

Python file
Implement the squelch function
Needs more Documentation

1.2.22.1) standard_squelch ( )
Type
Description
Usage
Parameters
Sub Function 1
Description
Sub Function 2
Description
Sub Function 3
Description

Function
Implement the squelch function with 100msec time constant
blks2. standard_squelch(audio_rate)
audio_rate : Audio rate
blks2. standard_squelch.set_threshold(threshold)
Set Squelch Threshold value
blks2. standard_squelch.threshold()
Return Squelch Threshold value
blks2. standard_squelch.squelch_range()
Return Squelch range

1.2.23) gnuradio/blks2impl/wfm_rcv.py
Type
Description
Examples
Note

Python file
Demodulating a broadcast FM signal with a deemphasis

1.2.23.1) wfm_rcv ( )
Type
Description
Usage
Parameters

Function
Hierarchical block for demodulating a broadcast FM signal. The input is the down converted
complex baseband signal (gr_complex).The output is the demodulated audio (float).
blks2.wfm_rcv(quad_rate, audio_decimation)
quad_rate: input sample rate of complex baseband input.
type quad_rate: float
audio_decimation: how much to decimate quad_rate to get to audio.
type audio_decimation: integer

1.2.24) gnuradio/blks2impl/wfm_rcv_pll.py
Type
Description
Examples
Note

Python file
Stereo demodulating a broadcast FM signal with a deemphasis

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1.2.24.1) wfm_rcv_pll ( )
Type
Description

Usage
Parameters

Function
Hierarchical block for demodulating a broadcast FM signal. The input is the down converted
complex baseband signal (gr_complex).The output is two streams of the demodulated audio
(float) 0=Left, 1=Right.
blks2.wfm_rcv_pll(demod_rate, audio_decimation)
demod_rate: input sample rate of complex baseband input.
type demod_rate: float
audio_decimation: how much to decimate demod_rate to get to audio.
type audio_decimation: integer

1.2.25) gnuradio/blks2impl/wfm_tx.py
Type
Description
Examples
Note

Python file
Wide Band FM Transmitter with a preemphasis

1.2.25.1) wfm_tx ( )
Type
Description
Usage
Parameters

1.3)

gnuradio/wxgui sub package

Type
Description

1.3.1)

Function
Wide Band FM Transmitter. Takes a single float input stream of audio samples in the range [1,+1]and produces a single FM modulated complex baseband output.
blks2. wfm_tx(audio_rate, quad_rate, tau=75e-6, max_dev=75e3)
audio_rate: sample rate of audio stream, >= 16k
type audio_rate: integer
quad_rate: sample rate of output stream, quad_rate must be an integer multiple of
audio_rate.
type quad_rate: integer
tau: preemphasis time constant (default 75e-6)
type tau: float
max_dev: maximum deviation in Hz (default 75e3)
type max_dev: float

Folder
Wxpython based gnuradio extension

gnuradio/wxgui/fftsink.py

Type
Description
Examples
Note

Python file
Gnuradio spectrum analyzer

1.3.1.1) fft_sink_x ( )
Type
Description

Function
FFT sink block.
fft_sink_c () : fft sink block for complex data samples.

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fft_sink_f () : fft sink block for real floating data samples.
fftsink.fft_sink_x(fg, parent, baseband_freq=0,
y_per_div=10, ref_level=50, sample_rate=1, fft_size=512,
fft_rate=15, average=False, avg_alpha=None,
title='', size=(640,240), peak_hold=False)

Usage

Parameters

1.3.2)

gnuradio/wxgui/fftsink2.py

Type
Description
Examples
Note

Python file
Gnuradio spectrum analyzer using stdgui2 and heir_block2

1.3.2.1) fft_sink_x ( )
Type
Description

Usage

Function
FFT sink block.
fft_sink_c () : fft sink block for complex data samples.
fft_sink_f () : fft sink block for real floating data samples.
fftsink2.fft_sink_x(parent, baseband_freq=0,
y_per_div=10, ref_level=50, sample_rate=1, fft_size=512,
fft_rate=15, average=False, avg_alpha=None,
title='', size=(640,240), peak_hold=False)

Parameters

1.3.3)

gnuradio/wxgui/scopesink.py

Type
Description
Examples
Note

Python file
Building block for python oscilloscope module.

1.3.3.1) scope_sink_x ( )
Type
Description

Usage

Function
Oscilloscope sink block.
scope_sink_c () : scope sink block for complex data samples.
scope_sink_f () : scope sink block for real floating data samples. Accepts 1 to 16 float
streams.
scopesink.scope_sink_x(fg, parent, title='', sample_rate=1,
size=(640,240), frame_decim=1,
v_scale=1000, t_scale=None)

Parameters

1.3.4)

gnuradio/wxgui/scopesink2.py

Type
Description
Examples
Note

Python file
Gnuradio Oscilloscope using stdgui2 and heir_block2

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1.3.4.1) scope_sink_x ( )
Type
Description

Usage

Function
Scope sink block.
scope_sink_c () : scope sink block for complex data samples.
scope_sink_f () : scope sink block for real floating data samples. Accepts 1 to 16 float
streams.
scopesink2.scope_sink_x(parent, title='', sample_rate=1,
size=default_scopesink_size, frame_decim=1,
v_scale=1000, t_scale=None, num_inputs=1)

Parameters

1.3.4.2) constellation_sink ( )
Type
Description
Usage

Function
Constellation sink block.
scopesink2.constellation_sink(parent,title='Constellation',
size=(640,240), frame_decim=1)

Parameters

1.3.5)

gnuradio/wxgui/form.py

Type
Description
Examples
Note

1.3.6)

Python file
Gnuradio wxgui form

gnuradio/wxgui/numbersink.py

Type
Description
Examples
Note

Python file
Gnuradio Number Sink

1.3.6.1) number_sink_x ( )
Type
Description

Usage

Function
Number sink block.
number_sink_c () : number sink block for complex data samples.
number_sink_f () : number sink block for real floating data samples.
numbersink.number_sink_x(fg, parent, unit='',base_value=0,minval=100.0,maxval=100.0,factor=1.0,
decimal_places=10, ref_level=50, sample_rate=1,
number_rate=15, average=False, avg_alpha=None,
label='', size=(640,240), peak_hold=False)

Parameters

1.3.7)

gnuradio/wxgui/numbersink2.py

Type
Description

Python file
Gnuradio Number Sink using hier_block2

sample_rate=1,

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Examples
Note

1.3.7.1) number_sink_x ( )
Type
Description

Usage

Function
Number sink block.
number_sink_c () : number sink block for complex data samples.
number_sink_f () : number sink block for real floating data samples.
numbersink2.number_sink_x(fg, parent, unit='',base_value=0,minval=100.0,maxval=100.0,factor=1.0,
decimal_places=10, ref_level=50, sample_rate=1,
number_rate=15, average=False, avg_alpha=None,
label='', size=(640,240), peak_hold=False)

Parameters

1.3.8)

gnuradio/wxgui/waterfallsink.py

Type
Description
Examples
Note

Python file
Gnuradio Waterfall Sink

1.3.8.1) waterfall_sink_x ( )
Type
Description

Usage

Function
Waterfall sink block.
waterfall_sink_c () : waterfall sink block for complex data samples.
waterfall_sink_f () : waterfall sink block for real floating data samples.
waterfallsink.number_sink_x(fg, parent, baseband_freq=0,
y_per_div=10, ref_level=50, sample_rate=1, fft_size=512,
fft_rate=15, average=False, avg_alpha=None,
title='', size=(640,240))

Parameters

1.3.9)

gnuradio/wxgui/waterfallsink2.py

Type
Description
Examples
Note

Python file
Gnuradio Waterfall Sink using hier_block2

1.3.9.1) waterfall_sink_x ( )
Type
Description

Usage

Parameters

Function
Waterfall sink block.
waterfall_sink_c () : waterfall sink block for complex data samples.
waterfall_sink_f () : waterfall sink block for real floating data samples.
waterfallsink2.number_sink_x(fg, parent, baseband_freq=0,
y_per_div=10, ref_level=50, sample_rate=1, fft_size=512,
fft_rate=15, average=False, avg_alpha=None,
title='', size=(640,240))

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1.3.10) gnuradio/wxgui/plot.py
Type
Description
Examples
Note

Python file
This is a simple light weight plotting module that is used with gnuradio.

1.3.11) gnuradio/wxgui/powermate.py
Type
Description
Examples
Note

Python file
Handler for Griffin PowerMate, Contour ShuttlePro & ShuttleXpress USB knobs.This
is Linux and wxPython specific
Needs more documentation

1.3.12) gnuradio/wxgui/silder.py
Type
Description
Examples
Note

Python file
Return a wx.Slider object
Needs more documentation

1.3.13) gnuradio/wxgui/stdgui.py
Type
Description
Examples
Note

Python file
A simple wx gui for GNU Radio applications
Needs more documentation

1.3.14) gnuradio/wxgui/stdgui2.py
Type
Description
Examples
Note

Python file
A simple wx gui for GNU Radio applications using hier_block2
Needs more documentation

1.3.15) gnuradio/wxgui/ra_fftsink.py
Type
Description
Examples
Note

Python file
Radio astronomy gnuradio spectrum analyzer

1.3.15.1) ra_fft_sink_x ( )
Type
Description

Function
FFT sink block.
ra_fft_sink_c () : fft sink block for complex data samples.

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Usage

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ra_fft_sink_f () : fft sink block for real floating data samples.
ra_fftsink.ra_fft_sink_x(fg, parent, baseband_freq=0,
y_per_div=10, sc_y_per_div=0.5, sc_ref_level=40, ref_level=50,
sample_rate=1, fft_size=512,
fft_rate=15, average=False, avg_alpha=None, title='',
size=(640,140), peak_hold=False, ofunc=None,
xydfunc=None)

Parameters

1.3.16) gnuradio/wxgui/ra_fftsink.py
Type
Description
Examples
Note

Python file
Radio astronomy gnuradio spectrum analyzer

1.3.16.1) ra_fft_sink_x ( )
Type
Description

Usage

Function
FFT sink block.
ra_fft_sink_c () : fft sink block for complex data samples.
ra_fft_sink_f () : fft sink block for real floating data samples.
ra_fftsink.ra_fft_sink_x(fg, parent, baseband_freq=0,
y_per_div=10, sc_y_per_div=0.5, sc_ref_level=40, ref_level=50,
sample_rate=1, fft_size=512,
fft_rate=15, average=False, avg_alpha=None, title='',
size=(640,140), peak_hold=False, ofunc=None,
xydfunc=None)

Parameters

1.3.17) gnuradio/wxgui/ra_waterfallsink.py
Type
Description
Examples
Note

Python file
Radio Astronomy gnuradio Waterfall Sink

1.3.17.1) waterfall_sink_x ( )
Type
Description

Usage

Function
Waterfall sink block.
waterfall_sink_c () : waterfall sink block for complex data samples.
waterfall_sink_f () : waterfall sink block for real floating data samples.
ra_waterfallsink.number_sink_x(fg, parent, baseband_freq=0,
ref_level=0, sample_rate=1, fft_size=512,
fft_rate=15, average=False, avg_alpha=None,
title='', size=(640,240), report=None, span=40, ofunc=None, xydfunc=None)

Parameters

1.3.18) gnuradio/wxgui/ra_stripcharsink.py
Type
Description
Examples
Note

Python file
Radio Astronomy gnuradio ??????????????????????
Needs more documentation

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1.3.18.1) stripchar_sink_x ( )
Type
Description
Usage

Function
???????????????
ra_stripcharsink.stripchart_sink_f(fg, parent,
y_per_div=10, ref_level=50, sample_rate=1,
title='', stripsize=4,
size=(640,140),xlabel="X",
ylabel="Y", divbase=0.025,
parallel=False, scaling=1.0, autoscale=False)

Parameters

1.4)

gnuradio/vocoder sub package

Type
Description

1.4.1)

Folder
GSM and CVSD blocks

gnuradio/vocoder/gsm_full_rate.py

Type
Description
Examples
Note

Python file
GSM 6.10 Full rate encoder decoder blocks
Needs more documentation

1.4.1.1) encode_sp ( )
Type
Description
Usage
Parameters

Function
GSM 06.10 Full Rate Vocoder Encoder block input type is short, output type packets.
gsm_full_rate.encode_sp()
shorts in
33 byte packets out

1.4.1.2) decode_ps ( )
Type
Description
Usage
Parameters

1.4.2)

Function
GSM 06.10 Full Rate Vocoder Decoder block input type is packets, output type short.
gsm_full_rate.decode_ps()
33 byte packets in
shorts out

gnuradio/vocoder/cvsd_vocoder.py

Type
Description
Examples
Note

Python file
CVSD encoder decoder blocks
Needsmore documentation

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1.4.2.1) encode_sb ( )
Type
Description

Usage
Parameters

Function
This block performs CVSD audio encoding. Its design and implementation is modeled after
the CVSD encoder/decoder specifications defined in the Bluetooth standard.
CVSD Vocoder Encoder block input type is shorts, output type bytes.
cvsd_vocoder.encode_sb()
shorts in
bytes out

1.4.2.2) decode_bs ( )
Type
Description

Usage
Parameters

1.5)

gnuradio/pager sub package

Type
Description

1.5.1)

Function
This block performs CVSD audio decoding. Its design and implementation is modeled after
the CVSD encoder/decoder specifications defined in the Bluetooth standard
CVSD Vocoder Decoder block input type is bytes, output type shorts.
cvsd_vocoder.decode_bs()
Bytes in
shorts out

Folder
Radio Pager receiver blocks

gnuradio/pager/flex_demod.py

Type
Description

Examples
Note

Python file
This GNU Radio component implements a FLEX radio pager receiver/demodulator.
FLEX pager towers are between 929 MHz and 932 MHz at 25 KHz centers.
Current status (7/16/07):
FLEX receiving is completed except for addition of BCH error correction.
See /gnuradio/gr-pager
Needs more documentaion

1.5.1.1) flex_demod ( )
Type
Description
Usage
Parameters

1.5.2)

Function
FLEX pager protocol demodulation block. This block demodulates a band-limited, complex
down-converted baseband channel into FLEX protocol frames.
pager.flex_demod(queue, freq=0.0, verbose=False, log=False)

gnuradio/pager/pager_swig.py

Type
Description

Python file
This file was automatically generated by SWIG. It contains all the necessary
software components to implement pager flex demodulation block.

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Examples
Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5

1.5.3)

Examples
Note

Examples
Note

Python file
This example application demonstrates receiving and demodulating the
FLEX pager protocol.
See gnuradio/gr-pager/README

gnuradio/pager/usrp_flex_all.py

Type
Description
Examples
Note

1.5.6)

Python file
All your pager applications belong to us.
This is a general program that uses the USRP to demodulate any pager bandwidth.
Program options are :
--upper-freq", type="eng_float", help="lower Rx frequency
--lower-freq", type="eng_float", help="upper Rx frequency --rx-board",
type="subdev", help="select USRP Rx side A or B (default=first daughterboard
found)”
--calibration", type="eng_float", default=0.0, help="set frequency offset to Hz”
--gain", type="int", help="set RF gain"
See gnuradio/gr-pager/README

gnuradio/pager/usrp_flex.py

Type
Description

1.5.5)

Needs more documentation
pager_flex_deinterleave()
pager_flex_frame()
pager_flex_parse()
pager_flex_sync()
pager_slicer_fb()

gnuradio/pager/aypabtu.py

Type
Description

1.5.4)

Page 69 of 208

Python file
This application demonstrates receiving and demodulating the FLEX pager protocol
for the entire 3 MHz band.
See gnuradio/gr-pager/README

gnuradio/pager/usrp_flex_band.py

Type
Description
Examples
Note

Python file
This application demonstrates receiving and demodulating the FLEX pager protocol
for 1 MHz band.
See gnuradio/gr-pager/README

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1.6)

gnuradio/gruimpl sub package

Type
Description

1.6.1)

Page 70 of 208

Folder
Gnuradio Utility implementation package

gnuradio/ gruimpl /crc.py

Type
Description
Examples
Note

Python file
This GNU Radio component implements CRC generation and checking
Needs more documentation

1.6.1.1) gen_and_append_crc32 ( )
Type
Description
Usage
Parameters

Function
Generate CRC
gru.gen_and_append_crc32(s)
s: String

1.6.1.2) check_crc32 ( )
Type
Description
Usage
Parameters

1.6.2)

Function
Generate CRC
gru.check_crc32(s)
s: String

gnuradio/ gruimpl /freqz.py

Type
Description
Examples
Note

Python file
Compute frequency response of a digital filter
Needs more documentation

1.6.2.1) freqz ( )
Type
Description

Function
Given the numerator (b) and denominator (a) of a digital filter compute its frequency
response.
jw
-jw
-jmw
jw B(e) b[0] + b[1]e + .... + b[m]e
H(e) = ---- = -----------------------------------jw
-jw
-jnw
A(e) a[0] + a[2]e + .... + a[n]e
Inputs:
b, a --- the numerator and denominator of a linear filter.
worN --- If None, then compute at 512 frequencies around the unit circle.
If a single integer, the compute at that many frequencies.
Otherwise, compute the response at frequencies given in worN
whole -- Normally, frequencies are computed from 0 to pi (upper-half of
unit-circle. If whole is non-zero compute frequencies from 0
to 2*pi.

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Outputs: (h,w)

Usage
Parameters

1.6.3)

h -- The frequency response.
w -- The frequencies at which h was computed.
gru.freqz(b, a, worN=None, whole=0, plot=None)
b, a : The numerator and denominator of a linear filter.
worN : If None, then compute at 512 frequencies around the unit circle. If a single integer,
the compute at that many frequencies. Otherwise, compute the response at frequencies
given in worn
whole : Normally, frequencies are computed from 0 to pi (upper-half of unit-circle. If whole
is non-zero compute frequencies from 0 to 2*pi.

gnuradio/ gruimpl /gnuplot_freqz.py

Type
Description
Usage
Parameters
Examples
Note

Python file
Plot the frequency response of a digital filter using Gnuplot
gru.gnuplot_freqz(taps, sample_rate)
taps : taps generated by gru.freqz
sample_rate : ??????
See ayfabtu.py
Needs more documentation

1.6.3.1) gnuplot_freqz ( )
Type
Description

Usage
Parameters

1.6.4)

Function
Plot the frequency response of a digital filter using Gnuplot.
Returns a handle to the gnuplot graph. When the handle is reclaimed the graph is torn
down
gru.gnuplot_freqz (hw, Fs=None, logfreq=False)
hw : is a tuple of the form (h, w) where h is sequence of complex freq responses, and w is
a sequence of corresponding frequency points. Plot the frequency response using
gnuplot.
Fs : If Fs is provided, use it as the sampling frequency, else use 2*pi.

gnuradio/ gruimpl /gnuplot_freqz.py

Type
Description
Examples
Note

Python file
Plot the frequency response of a digital filter using Gnuplot
Needs more documentation

1.6.4.1) gnuplot_freqz ( )
Type
Description

Usage
Parameters

Function
Plot the frequency response of a digital filter using gnuplot.
Returns a handle to the gnuplot graph. When the handle is reclaimed the graph is torn
down
gru.gnuplot_freqz (hw, Fs=None, logfreq=False)
hw : is a tuple of the form (h, w) where h is sequence of complex freq responses, and w is
a sequence of corresponding frequency points. Plot the frequency response using
gnuplot.
Fs : If Fs is provided, use it as the sampling frequency, else use 2*pi.

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1.6.5)

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gnuradio/ gruimpl /hexint.py

Type
Description
Examples
Note

Python file
Convert unsigned masks into signed integers

1.6.5.1) hexint ( )
Type
Description

Usage
Parameters

1.6.6)

Function
Convert unsigned masks into signed integets. This allows us to use hex constants like
0xf0f0f0f2 when talking to our hardware and not get screwed by them getting treated as
python longs.
gru.hexint(mask)
mask : hex string

gnuradio/ gruimpl /listmsc.py

Type
Description
Examples
Note

Python file
Return a copy of x that is reverse order

1.6.6.1) list_revers ( )
Type
Description
Usage
Parameters

1.6.7)

Function
Return a copy of x that is reverse order
gru.list_revers(x)
x : list

gnuradio/ gruimpl /lmx2306.py

Type
Description
Examples
Note

Python file
'''Control National LMX2306 based frequency synthesizer using PC Parallel port

1.6.7.1) lmx2306 ( )
Type
Description
Usage
Parameters

Function
Control the National LMX2306 PLL
gru.lmx2306(fosc, step_size, which_pp = 0)
fosc : is the frequency of the reference oscillator,
step_size : is the step between valid frequencies,
which_pp : specifies which parallel port to use

Simple Gnuradio User Manual

1.6.8)

gnuradio/ gruimpl /mathmisc.py

Type
Description
Examples
Note
Sub Function 1
Sub Function 2
Sub Function 3

1.6.9)

Page 73 of 208

Python file
Some Math functions like GCD, LCM, Log2

gru.gcd(a.b)
gru.lcm(a.b)
gru.log2(x)

gnuradio/ gruimpl /os_read_exactly.py

Type
Description
Examples
Note

Python file
Replacement for os.read that blocks until it reads exactly nbytes.

1.6.9.1) os_read_exactly ( )
Type
Description
Usage
Parameters

Function
Replacement for os.read that blocks until it reads exactly nbytes.
gru.os_read_exactly(file_descriptor, nbytes)

1.6.10) gnuradio/ gruimpl /sdr_1000.py
Type
Description
Examples
Note

Python file
Control the DDS on the SDR-1000

1.6.10.1) sdr_1000 ( )
Type
Description
Usage
Parameters
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9
Sub Function 10

Function
Control the DDS on the SDR-1000
gru.sdr_1000(pport=0)
gru.sdr_1000.write_reg(addr, data)
gru.sdr_1000.set_freq(freq)
gru.sdr_1000.set_band(freq)
gru.sdr_1000.set_bit (reg, bit, state)
gru.sdr_1000.set_tx(on=1)
gru.sdr_1000.set_rx()
gru.sdr_1000.set_gain (high)
gru.sdr_1000.set_mute (mute = 1)
gru.sdr_1000.set_unmute ()
gru.sdr_1000.set_external_pin (pin, on = 1)

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1.6.11) gnuradio/ gruimpl /seq_with_cursor.py
Type
Description
Usage
Parameters
Examples
Note

Python file
?????????????, I think it is like a loopup table item selector.
Return a list item indexed by cursor
gru.seq_with_cursor(list_array, cursor)
list_array : list holds data ???????????
cursor : list index ???????
Needs more documentation

1.6.12) gnuradio/ gruimpl /socket_stuff.py
Type
Description
Examples
Note

Python file
Setup sockets for TCP/UDP connections

1.6.12.1) tcp_connect_or_die ( )
Type
Description
Usage
Parameters

Function
Setup sockets for TCP connections.
returns: socket or exits
gru.tcp_connect_or_die(sock_addr)
sock_addr: (host, port) to connect to
type sock_addr: tuple

1.6.12.2) udp_connect_or_die ( )
Type
Description
Usage
Parameters

1.7)

gnuradio/gru sub package

Type
Description

1.8)

Function
Setup sockets for UDP connections.
returns: socket or exits
gru.udp_connect_or_die(sock_addr)
sock_addr: (host, port) to connect to
type sock_addr: tuple

Folder
Semi-hideous kludge to import everything in the gruimpl directory into the gnuradio.gru
namespace.

gnuradio/gr sub package

Type
Description

Folder
This is the main GNU Radio python module. We pull the swig output and the other
modules into the gnuradio.gr namespace

Simple Gnuradio User Manual

1.8.1)

gnuradio/ gr / basic_flow_graph.py

Type
Description
Examples
Note
Sub Function 1
Sub Function 2
Sub Function 3

1.8.2)

connect () : Connect blocks. connect requires two or more arguments that can be
coerced to endpoints
disconnect () : Disconnect blocks. disconnect requires two arguments
disconnect_all() : disconnect all graph blocks.

Python file
Add physical connection info to basic_flow_graph and play

start() : Start graph, forking thread(s), return immediately
stop() : Tells scheduler to stop and waits for it to happen
wait() : Waits for scheduler to stop.
run(): Start graph, wait for completion
is_running() : Check if the graph is still running

gnuradio/ gr / exceptions.py

Type
Description
Examples
Note
Sub Function 1
Sub Function 2

1.8.4)

Python file
Constructs the basic flow graph and provides basic operations on the graph.

gnuradio/ gr / flow_graph.py

Type
Description
Examples
Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5

1.8.3)

Page 75 of 208

Python file
Exception handling

NotDAG (Exception):Not a directed acyclic graph
CantHappen (Exception):Can't happen

gnuradio/ gr / gnuradio_swig_py_filter.py

Type
Description

Python file
This file was automatically generated by SWIG. All digital IIR and FIR filter blocks
implemented here.

Examples
Note

1.8.4.1) iir_filter_ffd ( )
Type
Description

Usage
Parameters

Function
IIR filter with float input, float output and double taps. This filter uses the Direct Form I
implementation, where fftaps contains the feed-forward taps, and fbtaps the feedback
ones.
gr.iir_filter_ffd(fftaps,fbtaps)
Fftaps : contains the feed-forward taps

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Example

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fbtaps : the feedback taps
gr.iir_filter_ffd.set_taps(fftaps,fbtaps)
See hfx2.py in apps

1.8.4.2) single_pole_iir_filter_xx ( )
Type
Description

Usage
Parameters
Sub Function 1

Function
Used to do averaging for input vector
single_pole_iir_filter_ff: single pole IIR filter with float input, float output
single_pole_iir_filter_cc: single pole IIR filter with complex input, complex output.
When alpha =1, no averaging is done.
The input and output satisfy a difference equation of the form :
y(n)=alpha* x(n)+(1-alpha)y(n-1)
gr. single_pole_iir_filter_xx(alpha,vlen)
alpha : double , time costant.
vlen : unsigned integer, vector length
gr. single_pole_iir_filter_xx.set_taps(alpha)

1.8.4.3) hilbert_fc ( )
Type
Description
Usage
Parameters

Function
Hilbert transformer FIR filter. Real output is input appropriately delayed. Imaginary output
is hilbert filtered (90 degree phase shift) version of input.
gr. hilbert_fc(ntaps)
ntaps : unsigned integer, number of taps (odd)

1.8.4.4) filter_delay_fc ( )
Type
Description

Usage
Parameters

Function
Filter-Delay Combination Block. The block takes one or two float stream and outputs a
complex stream. If only one float stream is input, the real output is a delayed version of
this input and the imaginary output is the filtered output. If two floats are connected to the
input, then the real output is the delayed version of the first input, and the imaginary
output is the filtered output. The delay in the real path accounts for the group delay
introduced by the filter in the imaginary path. The filter taps needs to be calculated before
initializing this block.
gr. filter_delay_fc (taps)
taps : vector of float taps

1.8.4.5) fft _filter_xx ( )
Type
Description
Usage
Parameters
Sub Function 1

Function
fft_filter_ccc: Fast FFT filter with complex input, complex output and complex taps.
fft_filter_fff: Fast FFT filter with float input, float output and float taps
gr. fft_filter _xx(decimation, taps)
decimation : integer
taps : float
gr. fft_filter _xx.set_taps(taps)

1.8.4.6) fractional_interpolator_xx ( )
Type
Description

Function
fractional_interpolator_cc : Interpolating mmse filter with complex input, complex

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Usage
Parameters
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4

Page 77 of 208

output..
fractional_interpolator_ff : Interpolating mmse filter with float input, float output.
gr. fractional_interpolator(phase_shift,inter_ratio)
phase_shift :float
inter_ratio : float
gr. fractional_interpolator_xx.mu() : return mu (phase shift) as a float number
gr. fractional_interpolator_xx.inter_ratio() : return interpolation ratio as a float number
gr. fractional_interpolator_xx.set_mu( mu) : set float mu (phase shift)
gr. fractional_interpolator_xx.set_inter_ratio(inter_ratio) : set float interpolation ratio

1.8.4.7) goertzel_fc ( )
Type
Description
Usage
Parameters

Function
Do the Goertzel single-bin DFT calculation.
gr. goertzel_fc (rate, len, freq)
rate :integer
len :integer
freq: float

1.8.4.8) cma_equalizer_cc ( )
Type
Description
Usage
Parameters

Function
Implements constant modulus adaptive filter on complex stream
gr. cma_equalizer_cc(num_taps, modulus,mu)
num_taps :integer
modulus: float
mu: float (phase shift)

1.8.4.9) adaptive_fir_ccf ( )
Type
Description
Usage
Parameters

Sub Function 1
Note

Function
Adaptive FIR filter with gr_complex input, gr_complex output and float taps.
gr. adaptive_fir_ccf (name, decimation, taps)
name : string
decimation :integer
taps :list of float
gr. adaptive_fir_ccf.set_taps(taps): set a float filter taps
Needs more documentation

1.8.4.10) fir_filter_xxx ( )
Type
Description

Usage
Parameters

Function
fir_filter_ccc: FIR filter with gr_complex input, gr_complex output and gr_complex taps
fir_filter_ccf: FIR filter with gr_complex input, gr_complex output and float taps
fir_filter_fcc: FIR filter with float input, gr_complex output and gr_complex taps
fir_filter_fff: FIR filter with float input, float output and float taps
fir_filter_fsf: FIR filter with float input, short output and float taps
fir_filter_scc: FIR filter with short input, gr_complex output and gr_complex taps
gr. fir_filter_xxx (decimation, taps)
decimation :integer
taps: depends on function

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Note

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gr.fir_filter_xxx.set_taps(taps): set filter taps
Needs more documentation

1.8.4.11) freq_xlating_fir_filter_xxx ( )
Type
Description

Usage
Parameters

Sub Function 1
Sub Function 2

Function
Software frequency (DDC or DUC) translation filter. This class efficiently combines a
frequency translation (typically "down conversion") with a FIR filter (typically low-pass)
and decimation. It is ideally suited for a "channel selection filter" and can be efficiently
used to select and decimate a narrow band signal out of wide bandwidth input. Uses a
single input array to produce a single output array. Additional inputs and/or outputs are
ignored.
freq_xlating_fir_filter_ccc: FIR filter combined with frequency translation with
gr_complex input, gr_complex output and gr_complex taps
freq_xlating_fir_filter _ccf: FIR filter combined with frequency translation with
gr_complex input, gr_complex output and float taps
freq_xlating_fir_filter _fcc: FIR filter combined with frequency translation with float
input, gr_complex output and gr_complex taps
freq_xlating_fir_filter _fcf: FIR filter combined with frequency translation with float
input, complex output and float taps
freq_xlating_fir_filter _scf: FIR filter combined with frequency translation with short
input, complex output and float taps
freq_xlating_fir_filter _scc: FIR filter combined with frequency translation with short
input, gr_complex output and gr_complex taps
gr. freq_xlating_fir_filter _xxx (decimation, taps, center_freq, sampling_freq)
decimation :integer
taps: depends on function
center_freq : double
sampling_freq : double
gr. freq_xlating_fir_filter_xxx.set_taps(taps): set filter taps
gr. freq_xlating_fir_filter_xxx.set_center_freq(center_freq): set (type double)
center_frequency

1.8.4.12) interp_fir_filter_xxx ( )
Type
Description

Usage
Parameters
Sub Function 1
Note

Function
interp_fir_filter_ccc: Interpolating FIR filter with gr_complex input, gr_complex output
and gr_complex taps
interp_fir_filter_ccf: Interpolating FIR filter with gr_complex input, gr_complex output
and float taps
interp_fir_filter_fcc: Interpolating FIR filter with float input, gr_complex output and
gr_complex taps
interp_fir_filter_fff: Interpolating FIR filter with float input, float output and float taps
interp_fir_filter_fsf: Interpolating FIR filter with float input, short output and float taps
interp_fir_filter_scc: Interpolating FIR filter with short input, gr_complex output and
gr_complex taps
gr. interp_fir_filter _xxx (interpolation, taps)
interpolation :integer
taps: depends on function
gr. interp_fir_filter _xxx.set_taps(taps): set filter taps

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1.8.4.13) rational_resampler_base_xxx ( )
Type
Description

Usage
Parameters

Sub Function 1
Sub Function 2
Sub Function 1
Note

1.8.5)

Function
rational_resampler_base_ccc: Rational Resampling Polyphase FIR filter with
gr_complex input, gr_complex output and gr_complex taps
rational_resampler_base_ccf: Rational Resampling Polyphase FIR filter with
gr_complex input, gr_complex output and float taps
rational_resampler_base_fcc: Rational Resampling Polyphase FIR filter with float
input, gr_complex output and gr_complex taps
rational_resampler_base_fff: Rational Resampling Polyphase FIR filter with float input,
float output and float taps
rational_resampler_base_fsf: Rational Resampling Polyphase FIR filter with float input,
short output and float taps
rational_resampler_base_scc: Rational Resampling Polyphase FIR filter with short
input, gr_complex output and gr_complex taps
gr. rational_resampler_base _xxx (interpolation, decimation, taps)
interpolation :unsigned
decimation : unsigned
taps: depends on function
gr rational_resampler_base _xxx.set_taps(taps): set filter taps
gr rational_resampler_base _xxx.intrpolation(): return interpolation value
gr rational_resampler_base _xxx.decimation(): return decimation value

gnuradio/ gr / gnuradio_swig_py_gengen.py

Type
Description

Python file
This file was automatically generated by SWIG. Some mathematical, source and
sink blocks are defined here.

Examples
Note

1.8.5.1) add_xx ( )
Type
Description

Usage
Parameters
Note

Function
add_cc : output = sum (input_0, input_1, ...). Add across all input complex streams.
add_ii : output = sum (input_0, input_1, ...). Add across all input integer streams.
add_ss : output = sum (input_0, input_1, ...). Add across all input short streams.
add_ff : output = sum (input_0, input_1, ...). Add across all input float streams.
gr.add _xx ()

1.8.5.2) add_vxx ( )
Type
Description

Usage
Parameters
Note

Function
add_vcc : output = sum (input_0, input_1, ...). Add across all input complex vectors.
add_vii : output = sum (input_0, input_1, ...). Add across all input integer vectors.
add_vff : output = sum (input_0, input_1, ...). Add across all input float vectors.
add_vss : output = sum (input_0, input_1, ...). Add across all input short vectors.
gr.add _vxx()

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1.8.5.3) add_const_xx ( )
Type
Description

Usage
Parameters
Note
Sub Function 1

Function
add_const_cc : output = input + complex constant. Add constant to input complex
streams.
add_ const_ii : output = input + integer constant. Add constant to input integer streams.
add_ const_ss : output = input + short constant. Add constant to input short streams.
add_ const_ff : output = input + float constant. Add constant to input float streams.
add_ const_sf : output = input + float constant. Add constant to input short streams.
gr.add_const _xx (k)
k: constant value, type depends on the function type
gr.add_const_xx.set_k(k): set the constant value on the fly.

1.8.5.4) add_const_vxx ( )
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
add_const_vcc : output vector = input complex vector + constant complex vector.
add_ const_vii : output vector = input integer vector + constant integer vector.
add_ const_vss : output vector = input short vector + constant short vector.
add_ const_vff : output vector = input float vector + constant float vector.
gr.add_const _vxx (k)
k: constant value, type depends on the function type
gr.add_const_vxx.set_k (k): set the constant value on the fly.
gr.add_const_vxx.k(): return the constant vector

1.8.5.5) argmax_xx ( )
Type
Description

Usage
Parameters
Note

Function
argmax_fs : ????????????????
argmax_is : ????????????????
argmax_ss: ????????????????
gr.argmax _xx (vlen)
vlen : vector length
Needs more documentation

1.8.5.6) chunks_to_symbols _xx( )
Type
Description

Usage

Function
Map a stream of symbol indexes (unpacked bytes or shorts) to stream of float or complex
onstellation points.in D dimensions (D = 1 by default).
out[n D + k] = symbol_table[in[n] D + k], k=0,1,...,D-1
The combination of gr_packed_to_unpacked_XX followed by gr_chunks_to_symbols_XY
handles the general case of mapping from a stream of bytes or shorts into arbitrary float
or complex symbols.
chunks_to_symbols_bf : input: stream of unsigned char; output: stream of float
chunks_to_symbols_bc : input: stream of unsigned char; output: stream of gr_complex
chunks_to_symbols_sf : input: stream of shorts; output: stream of float
chunks_to_symbols_sc : input: stream of shorts; output: stream of gr_complex
chunks_to_symbols_if : input: stream of integers; output: stream of float
chunks_to_symbols_ic : input: stream of integers; output: stream of gr_complex
gr.chunks_to_symbols _xx(symbol_table, D)

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Note
Sub Function 1
Sub Function 2

Page 81 of 208

symbol_table : ????????????
D : dimensions, const integer
gr. chunks_to_symbols_xx.symbol_table(): return symbol table
gr. chunks_to_symbols_xx.D(): return dimension

1.8.5.7) packed_to_unpacked _xx( )
Type
Description

Usage
Parameters

Function
Convert a stream of packed bytes or shorts to stream of unpacked bytes or shorts.
This is the inverse of gr_unpacked_to_packed_XX. The bits in the bytes or shorts input
stream are grouped into chunks of bits_per_chunk bits and each resulting chunk is
written right- justified to the output stream of bytes or shorts. All b or 16 bits of the each
input bytes or short are processed. The right thing is done if bits_per_chunk is not a
power of two. The combination of gr_packed_to_unpacked_XX_ followed by
gr_chunks_to_symbols_Xf or gr_chunks_to_symbols_Xc handles the general case of
mapping from a stream of bytes or shorts into arbitrary float or complex symbols.
packed_to_unpacked _bb: input: stream of unsigned char; output: stream of unsigned
char
packed_to_unpacked _ii: input: stream of integers; output: stream of intergers
packed_to_unpacked _ss: input: stream of shorts; output: stream of shorts
gr. packed_to_unpacked _xx(bits_per_chunk, endianness)
bits_per_chunk :unsigned int
endianness : GR_MSB_FIRST, GR_LSB_FIRST

Note

1.8.5.8) unpacked_to_packed _xx( )
Type
Description

Usage
Parameters

Function
Convert a stream of unpacked bytes or shorts into a stream of packed bytes or shorts.
This is the inverse of gr_packed_to_unpacked_XX. The low bits_per_chunk bits are
extracted from each input byte or short. These bits are then packed densely into the
output bytes or shorts, such that all 8 or 16 bits of the output bytes or shorts are filled
with valid input bits. The right thing is done if bits_per_chunk is not a power of two.
The combination of gr_packed_to_unpacked_XX followed by gr_chunks_to_symbols_Xf
or gr_chunks_to_symbols_Xc handles the general case of mapping from a stream of
bytes or shorts into arbitrary float or complex symbols.
unpacked_to_packed _bb: input: stream of unsigned char; output: stream of unsigned
char
unpacked_to_packed _ii: input: stream of integers; output: stream of intergers
unpacked_to_packed _ss: input: stream of shorts; output: stream of shorts
gr. unpacked_to_packed _xx(bits_per_chunk, endianness)
bits_per_chunk :unsigned int
endianness : GR_MSB_FIRST, GR_LSB_FIRST

Note

1.8.5.9) divide_xx( )
Type
Description

Usage
Parameters
Note

Function
divide_cc : output = input_0 / input_1 / input_x ...) .Divide across all input complex
streams.
divide_ss : output = input_0 / input_1 / input_x ...) .Divide across all input short streams.
divide_ii : output = input_0 / input_1 / input_x ...) .Divide across all input integer streams.
divide_ff : output = input_0 / input_1 / input_x ...) .Divide across all input float streams.
gr.divide_xx()

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1.8.5.10) max_xx ( )
Type
Description

Usage
Parameters
Note

Function
max_ff : ????????????????
max_ii : ????????????????
max_ss: ????????????????
gr.max _xx (vlen)
vlen : Vecter length
Needs more documentation

1.8.5.11) multiply_xx ( )
Type
Description

Usage
Parameters
Note

Function
multiply_cc : output = prod (input_0, input_1, ...). Multiply across all input complex
streams.
multiply _ii : output = prod (input_0, input_1, ...). Multiply across all input integer
streams.
multiply _ss : output = prod (input_0, input_1, ...). Multiply across all input short
streams.
multiply _ff : output = prod (input_0, input_1, ...). Multiply across all input float streams.
gr.multiply _xx ()

1.8.5.12) multiply_vxx ( )
Type
Description

Usage
Parameters
Note

Function
multiply_vcc : output = prod (input_0, input_1, ...). Element-wise multiply across all
input complex vectors
multiply _vii : output = prod (input_0, input_1, ...). Element-wise multiply across all input
integer vectors
multiply _vss : output = prod (input_0, input_1, ...). Element-wise multiply across all
input short vectors
multiply _vff : output = prod (input_0, input_1, ...). Element-wise multiply across all input
float vectors.
gr.multiply _vxx ()

1.8.5.13) multiply_const_xx ( )
Type
Description

Usage
Parameters
Note
Sub Function 1

Function
multiply_const_cc : output = input * complex constant. Multiply constant by input
complex streams.
multiply_const_ss : output = input * short constant. Multiply constant by input short
streams.
multiply_const_ii : output = input * integer constant. Multiply constant by input integer
streams.
multiply_const_ff : output = input * float constant. Multiply constant by input float
streams.
gr.multiply_const _xx (k)
k: constant value, type depends on the function type
gr.multiply_const_xx.set_k(k): set the constant value on the fly.

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1.8.5.14) multiply_const_vxx ( )
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
multiply_const_vcc : output vector = input complex vector * constant complex vector
(element-wise)
multiply_const_vii : output vector = input integer vector * constant integer vector
(element-wise)
multiply_const_vss : output vector = input short vector * constant short vector
(element-wise)
multiply_const_vff : output vector = input float vector * constant float vector (elementwise)
gr.multiply_const _vxx (k)
k: constant value, type depends on the function type
gr.multiply_const_vxx.set_k (k): set the constant value on the fly.
gr.multiply_const_vxx.k(): return the constant vector

1.8.5.15) mute_xx ( )
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
mute_cc: output = input or zero if muted ,input is complex, output is complex
mute_ss: output = input or zero if muted ,input is short, output is short
mute_ii: output = input or zero if muted ,input is integer, output is integer
mute_ff: output = input or zero if muted ,input is float, output is float
gr.mute_xx (mute)
mute : bool, True or False
gr.mute_xx.set_mute(mute): set mute on the fly.
gr.mute_xx.mute(): return mute status, True or false

1.8.5.16) noise_source_x ( )
Type
Description

Usage
Parameters

Note

Sub Function 1
Sub Function 2

Function
noise_source_c : complex random number source with predefined distribution
noise_source_f : float random number source with predefined distribution
noise_source_i : integer random number source with predefined distribution
noise_source_s : short random number source with predefined distribution
gr.noise_source_x(type, ampl, seed)
type : GR_UNIFORM, GR_GAUSSIAN, GR_LAPLACIAN, GR_IMPULSE
ampl : float, max signal amplitude
seed : long, random function seed value
Noise types should be used as follows :
gr.GR_UNIFORM
gr.GR_GAUSSIAN
gr.GR_LAPLACIAN
gr.GR_IMPULSE
gr.noise_source_x.set_type(type): set noise type.
gr.noise_source_x.set_amplitude(ampl): set float amplitude

1.8.5.17) peak_detector_xb ( )
Type
Description

Function
Detect the peak of a signal. If a peak is detected, this block outputs a 1, or it outputs 0's.
peak_detector_fb : Float input stream.
peak_detector_ib : Integer input stream.

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Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8

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peak_detector_sb : Short input stream.
gr.peak_detector_xb(threshold_factor_rise, threshold_factor_fall, look_ahead,
alpha)
threshold_factor_rise: The threshold factor (float) determines when a peak has started.
An average of the signal is calculated and when the value of the signal goes over
threshold_factor_rise*average, we start looking for a peak.
threshold_factor_fall :The threshold factor (float) determines when a peak has ended.
An average of the signal is calculated and when the value of the signal goes bellow
threshold_factor_fall*average, we stop looking for a peak.
look_ahead: The look-ahead (integer) value is used when the threshold is found to look
if there another peak within this step range. If there is a larger value, we set that as the
peak and look ahead again. This is continued until the highest point is found with This
look-ahead range.
alpha : The gain value (float) of a moving average filter (Time Constant in sec)
gr.peak_detector_xb.set_threshold_factor_rise(thr): Set the threshold factor value for the
rise time.
gr.peak_detector_xb.set_threshold_factor_fall(thr): Set the threshold factor value for the
fall time.
gr.peak_detector_xb.set_look_ahead(look): Set the look ahead factor value
gr.peak_detector_xb.set_alpha(alpha): Set the running average alpha
gr.peak_detector_xb.threshold_factor_rise(): return the threshold factor value for the rise
time.
gr.peak_detector_xb.threshold_factor_fall():return the threshold factor value for the fall
time.
gr.peak_detector_xb._look_ahead():return the look ahead factor value
gr.peak_detector_xb.alpha():return the running average alpha

1.8.5.18) sample_and_hold_xx ( )
Type
Description

Usage
Parameters
Note

Function
Sample and hold circuit. Samples the data stream (input stream 0) and holds the value if
the control signal is 1 (intput stream 1).
sample_and_hold_bb : input stream is unsigned char
sample_and_hold_ff : input stream is float
sample_and_hold_ii : input stream is integer
sample_and_hold_ss : input stream is short
gr.sample_and_hold_xx()

1.8.5.19) sig_source_x ( )
Type
Description

Usage
Parameters

Note

Function
sig_source_c : signal generator with gr_complex output.
sig_source_f : signal generator with float output.
sig_source_i : signal generator with integer output.
sig_source_s : signal generator with short output.
gr.sig_source_x(sampling_freq, waveform, frequency, ampl, offset)
sampling_freq : double
waveform : GR_CONST_WAVE GR_SIN_WAVE GR_COS_WAVE
GR_SQR_WAVE GR_TRI_WAVE GR_SAW_WAVE
frequency : double, signal frequency
ampl : double, signal max amplitude
offset : DC offset, value type depends on signal type
Waveform types should be used as follows :
gr.GR_CONST_WAVE
gr.GR_SIN_WAVE
gr.GR_COS_WAVE

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gr.GR_SQR_WAVE
gr.GR_TRI_WAVE
gr.GR_SAW_WAVE
gr.sig_source_x.set_sampling_freq(sampling_freq): set sampling frequency
gr.sig_source_x.set_waveform(waveform): set signal waveform
gr.sig_source_x.set_frequency(frequency): set signal frequency
gr.sig_source_x.set_amplitude(ampl): set signal amplitude
gr.sig_source_x.set_offset(offset): set DC offset
gr.sig_source_x.sampling_freq(): return sampling frequency
gr.sig_source_x.set_waveform(waveform): return signal waveform
gr.sig_source_x.set_frequency(frequency): return signal frequency
gr.sig_source_x.set_amplitude(ampl): return signal amplitude
gr.sig_source_x.set_offset(offset): return DC offset

Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9
Sub Function 10

1.8.5.20) sub_xx ( )
Type
Description

Usage
Parameters
Note

Function
sub _cc : output = sub (input_0, input_1, ...). Subtruct across all input complex streams.
sub _ii : output = sub (input_0, input_1, ...). Subtruct across all input integer streams.
sub _ss : output = sub (input_0, input_1, ...). Subtruct across all input short streams.
sub _ff : output = sub (input_0, input_1, ...). Subtruct across all input float streams.
gr.sub _xx ()

1.8.5.21) vector_sink_x ( )
Type
Description

Usage
Parameters
Note
Sub Function 1

Function
vector_sink_f : Float sink that writes to a vector.
vector_sink_c : Complex sink that writes to a vector.
vector_sink_i : Integer sink that writes to a vector.
vector_sink_s : Short sink that writes to a vector.
vector_sink_b : unsigned char sink that writes to a vector.
gr.vector _sink_x ()

gr.vector_sink_x .data() : Give us the stored vector data

1.8.5.22) vector_source_x ( )
Type
Description

Usage
Parameters
Note

Function
vector_source_f : Source of float that gets its data from a vector
vector_source_c : Source of complex that get its data from a vector
vector_source_i : Source of integer that gets its data from a vector
vector_source_s: Source of short that gets its data from a vector
vector_source_b : Source of unsigned char that gets its data from a vector
gr.vector _source_x (data, repeat=false)
data : data to be used to form the vector, type depends on function type.
repeat: bool True, or False, keep the source running by cyclicly repeating the data

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gnuradio/ gr / gnuradio_swig_py_runtime.py

Type
Description

Python file
This file was automatically generated by SWIG. Some mathematical, source and
sink blocks are defined here.

Examples
Note

1.8.6.1) io_signature ( )
Type
Description
Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3

Function
Create an i/o signature for input and output ports.
gr.io_signature(min_streams, max_streams, sizeof_stream_item)
min_streams : specify minimum number of streams (>= 0)
max_streams : specify maximum number of streams (>= min_streams or -1 -> infinite)
sizeof_stream_items : specify the size of the items in the streams
gr.io_signature.min_streams() : return min number of streams
gr.io_signature.max_streams() : return max number of streams
gr.io_signature.sizeof_stream_item() : return stream size

1.8.6.2) buffer ()
Type
Description

Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5

Function
Single writer, multiple reader fifo. Allocate a buffer that holds at least nitems of size
sizeof_item. The total size of the buffer will be rounded up to a system dependent
boundary. This is typically the system page size, but under MS windows is 64KB.
gr.buffer(nitems, sizeof_item)
nitem: Integer, number of items
sizeof_item : 8 if the data is complex, 4 if the data isinteger, 4 if the data is float, 2 if the
data is short, 1 if the data is unsigned character.
gr.buffer.space_availaible () :Integer, return number of items worth of space available for
writing
gr.buffer.write_pointer (): return pointer to write buffer.
gr.buffer.update_write_pointer():tell buffer that we wrote nitems into it
gr.buffer.set_done(true or false)
gr.buffer.done() : return True or false

1.8.6.3) buffer_reader ( )
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2
Sub Function 3

Function
Used to let us keep track of the readers of a gr_buffer.
gr.buffer_reader(buf, nzero_preload)
buf : gr_buffer pointer
nzero_preload : number of zero items to "preload" into buffer
gr.buffer_reader.items_availaible () :Integer, Return number of items available for
reading
gr.buffer_reader.buffer ():Return buffer this reader reads from.
gr.buffer_reader.maximum_possible_items_available():Return maximum number of
items that could ever be available for reading. This is used as a sanity check in the

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scheduler to avoid looping forever.
gr.buffer_reader.read_pointer() : return pointer to read buffer
gr.buffer_reader.update_read_pointer(nitems) : integer
gr.buffer_reader.set_done(true or false)
gr.buffer_reader.done() : return True or false

1.8.6.4) basic_block ( )
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
The abstract base class for all signal processing blocks. Basic blocks are the bare
abstraction of an entity that has a name and a set of inputs and outputs. These are never
instantiated directly; rather, this is the abstract parent class of both gr_hier_block, which
is a recursive container, and gr_block, which implements actual signal processing
functions.

Needs more documentation

1.8.6.5) block ( )
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
The abstract base class for all 'terminal' processing blocks. A signal processing flow is
constructed by creating a tree of hierarchical blocks, which at any level may also contain
terminal nodes that actually implement signal processing functions. This is the base
class for all such leaf nodes. Blocks have a set of input streams and output streams. The
input_signature and output_signature define the number of input streams and output
streams respectively, and the type of the data items in each stream.
Although blocks may consume data on each input stream at a different rate, all outputs
streams must produce data at the same rate. That rate may be different from any of the
input rates. User derived blocks override two methods, forecast and general_work, to
implement their signal processing behavior.
forecast () is called by the system scheduler to determine how many items are required
on each input stream in order to produce a given number of output items.
general_work () is called to perform the signal processing in the block. It reads the input
items and writes the output items.

Needs more documentation

1.8.6.6) block_detail ( )
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
Implementation details to support the signal processing abstraction. This class contains
implementation detail that should be "out of sight" of almost all users of GNU Radio. This
decoupling also means that we can make changes to the guts without having to
recompile everything.

Needs more documentation

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1.8.6.7) hier_block2 ( )
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
New Hierarchical container class for gr_block's.

Needs more documentation

1.8.6.8) single_threaded_scheduler ( )
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
Simple scheduler for stream computations.

Needs more documentation

1.8.6.9) message ( )
Type
Description
Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9

Function
Creat Message
gr.message (type, arg1, arg2, length)
type :Long, message type usually =0
arg1 : Double, any numeric argument
arg2 : Double, any numeric argument
length : Message length in bytes
Needs more documentation
gr.message.type() : return long
gr.message.arg1() : return double
gr.message.arg2() : return double
gr.message.set_type(type)
gr.message.set_arg1(arg1)
gr.message.set_arg2(arg2)
gr.message.length() : return message length
gr.message.msg (): Put the message here. Return the msg
gr.message.to_string() : Return the body of message as string

1.8.6.9) message_from_string ( )
Type
Description
Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4

Function
???????? Generate message from string
gr.message_from_string(s, type, arg1, arg2)
s : String
type :long
arg1 : Double, any numeric argument
arg2 : Double, any numeric argument
Needs more documentation
gr.message from_string.type() : return long
gr.message from_string.arg1() : return double
gr.message from_string.arg2() : return double
gr.message from_string.set_type(type)

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gr.message from_string.set_arg1(arg1)
gr.message from_string.set_arg2(arg2)
gr.message from_string.msg() : return pointer of type unsigned char to the message
gr.message from_string.to_string() : return string

1.8.6.10) message_handler ( )
Type
Description
Usage
Parameters
Note

Function
???????? Abstract class of message handlers
gr.message_handler.handle(msg)
msg : handle
Needs more documentation

1.8.6.11) msg_queue ( )
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9

Function
Thread-safe message queue.
Retuen a pointer to the created message queue
gr.msg_queue(limit)
limit : Set the number of holded messages in the queue
Needs more documentation
gr.msg_queue.handle (msg) : Generic msg_handler method: insert the message.
gr.msg_queue.insert_tail (msg) : Insert message at tail of queue.
gr.msg_queue.delete_head () : Delete message from head of queue and return it. Block
if no message is available.
gr.msg_queue.delete_head_nowait () : If there's a message in the queue, delete it and
return it. If no message is available, return 0.
gr.msg_queue.flush () : Delete all messages from the queue.
gr.msg_queue.empty_p () : is the queue empty?
gr.msg_queue.full_p () : is the queue full?
gr.msg_queue.count() : return (unsigned integer) number of messages in queue
gr.msg_queue.limit (): return (unsigned integer) limit on number of message in queue. 0
means unbounded

1.8.6.12) dispatcher ( )
Type
Description
Note
Sub Function 1

Sub Function 2
Sub Function 3
Sub Function 4

Function
Invoke callbacks based on select.
Needs more documentation
gr.dispatcher.loop (timeout=10): Event dispatching loop.
Enter a polling loop that only terminates after all gr_select_handlers have been removed.
timeout sets the timeout parameter to the select() call, measured in seconds.
timeout: maximum number of seconds to block in select.
gr.dispatcher.add_handler(handler) :
gr.dispatcher.del_handler(handler) :
gr.dispatcher.del_handler(handler) :

1.8.6.13) error_handler ( )
Type
Description
Note
Sub Function 1

Function
Abstract for error handler
Needs more documentation

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Sub Function 2
Sub Function 3
Sub Function 4

1.8.6.14) file_error_handler ( )
Type
Description
Note

Function
File error handler
Needs more documentation

1.8.6.15) sync_block ( )
Type
Description
Note

Function
Synchronous 1:1 input to output with history .Override work to provide the signal
processing implementation.
Needs more documentation

1.8.6.16) sync_decimator ( )
Type
Description
Note

Function
Synchronous N:1 input to output with history. Override work to provide the signal
processing implementation.
Needs more documentation

1.8.6.16) sync_interpolator ( )
Type
Description
Note

Function
Synchronous 1:N input to output with history. Override work to provide the signal
processing implementation.
Needs more documentation

1.8.6.17) top_block ( )
Type
Description
Usage
Parameters
Note
Sub Function 1

Sub Function 2
Sub Function 3
Sub Function 4

Sub Function 5

Function
Top-level hierarchical block representing a flowgraph.
gr.top_block(name)
name : string
Needs more documentation
gr.top_block.run () : The simple interface to running a flowgraph.
Calls start () then wait () . Used to run a flowgraph that will stop on its own, or to run a
flowgraph indefinitely until SIGINT is received.
gr.top_block.start () : Start the contained flowgraph. Creates one or more threads to
execute the flow graph. Returns to the caller once the threads are created.
gr.top_block.stop () : Stop the running flowgraph. Notifies each thread created by the
scheduler to shutdown, then returns to caller.
gr.top_block.wat () : Wait for a flowgraph to complete. Flowgraphs complete when either
(1) all blocks indicate that they are done (typically only when using gr.file_source, or
gr.head, or (2) after stop has been called to request shutdown.
gr.top_block.is_running() : Returns true if flowgraph is running

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1.8.6.18) enable_realtime_scheduling ( )
Type
Description
Usage
Parameters
Note

1.8.7)

Python file
Choose load gr_threading_23.py or gr_threading_24.py

gnuradio/ gr / threading_23.py

Type
Description
Examples
Note

1.8.9)

The possible Return values are : RT_NOT_IMPLEMENTED,RT_NO_PRIVS,
RT_OTHER_ERROR

gnuradio/ gr / threading.py

Type
Description
Examples
Note

1.8.8)

Function
If possible, enable high-priority "real time" scheduling.
Return gr.RT_Ok if successful,
gr.enable_realtime_scheduling()

Python file
Threading module for version 2.3

gnuradio/ gr / threading_24.py

Type
Description
Examples
Note

Python file
Threading module for version 2.4

1.8.10) gnuradio/ gr / hier_block2.py
Type
Description
Examples
Note

Python file
Construct new hierarchical blocks for flowgraph

1.8.11) gnuradio/ gr / hier_block.py
Type
Description

Usage
Parameters

Python file
Simple concrete class for building hierarchical blocks.This class assumes that there is at
most a single block at the head of the chain and a single block at the end of the chain.
Either head or tail may be None indicating a sink or source respectively. It can compose
one or more blocks (primitive or hierarchical) into a new hierarchical block.
gr.hier_block(fg, head_block, tail_block)
fg: The flow graph that contains this hierarchical block.
type fg: flow_graph
head_block: the first block in the signal processing chain.
type head_block: None or subclass of gr.block or gr.hier_block_base

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tail_block: the last block in the signal processing chain.
type tail_block: None or subclass of gr.block or gr.hier_block_base
Examples
Note

1.8.12) gnuradio/ gr / prefs.py
Type
Description

Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Examples
Note

Python file
Base class for representing user preferences in the windows INI files.
The real implementation is in Python, and is accessable from C++ via the magic of SWIG
directors. Derive our 'real class' from the stubbed out base class that has support for
SWIG directors. This allows C++ code to magically and transparently invoke the
methods in this python class.
gr.prefs ().has_section (section) : Does section exist? Section is string, return bool
True or False
gr.prefs ().has_option (section, option) : Does option exist? option is string, return
bool True or False
gr.prefs().get_string (section,option, default_val) : If option exists return associated
value; else return the string default_val.
gr.prefs().get_bool (section,option, default_val) : If option exists and value can be
converted to bool, return it; else return the bool default_val.
gr.prefs().get_long (section,option, default_val) : If option exists and value can be
converted to long, return it; else return the long default_val.
gr.prefs().get_double (section,option, default_val) : If option exists and value can be
converted to double, return it; else return the double default_val.
See usrp_spectrum_sense.py
Needs more documenation

1.8.13) gnuradio/ gr / scheduler.py
Type
Description

Python file
Schedule the threads.Invoke the single threaded scheduler's run method
Note that we're in a new thread, and that sts_pyrun releases the global interpreter lock.
This has the effect of evaluating the graph in parallel to the main line control code.

Examples
Note

1.8.14) gnuradio/ gr / top_block.py
Type
Description

Examples
Note

Python file
This hack forces a 'has-a' relationship to look like an 'is-a' one. It allows Python classes
to subclass this one, while passing through method calls to the C++ class shared pointer
from SWIG.It also allows us to intercept method calls if needed. This allows the
'run_locked' methods, which are defined in gr_top_block.i, to release the Python global
interpreter lock before calling the actual method in gr_top_block
Needs more documentation

1.8.15) gnuradio/ gr / gnuradio_swig_python.py
Type
Description
Examples
Note

Python file
This file implements the old gnuradio_swig_python namespace

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1.8.16) gnuradio/ gr / gnuradio_swig_io.py
Type
Description
Examples
Note

Python file
This file implements many sink and source blocks

1.8.16.1) file_sink_base ( )
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2
Sub Function 3

Function
Common base class for file sinks.
gr.file_sink_base(filename, is_binary)
filename: File Name
is_binary : bool True or False
gr.gr_file_sink_base.open (filename) : Open filename and begin output to it.
gr.gr_file_sink_base.close () : Close current output file. Closes current output file and
ignores any output until open is called to connect to another file.
gr.gr_file_sink_base.do_update () : if we've had an update, do it now.

1.8.16.2) file_sink ( )
Type
Description
Usage
Parameters

Function
Write a stream to a binary file.
gr.file_sink(itemzize,filename)
itemsize: one of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
filename: File name

Note

1.8.16.3) file_source ( )
Type
Description
Usage
Parameters

Note
Sub Function 1

Function
Read stream from binary file.
gr.file_source(itemzize,filename, repeat)
itemsize: gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
filename: File name
repeat : Bool True, or False, repeat file reading when EOF reached.
gr.file_source.seek (seek_point,whence) : seek file to seek_point relative to whence
seek_point : sample offset in file
whence : one of gr.SEEK_SET, gr.SEEK_CUR, gr.SEEK_END

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1.8.16.4) file_descriptor_sink ( )
Type
Description
Usage
Parameters
Note

Function
Write stream to file descriptor.
gr.file_descriptor_sink(itemzize, fd)
itemsize: one of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
fd: File descriptor, integer
Needs more documenation

1.8.16.5) file_descriptor_source ( )
Type
Description
Usage
Parameters

Note

Function
Read stream from file descriptor.
gr.file_descriptor_source(itemzize,fd, reapeat)
itemsize: gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
fd: File descriptor, integer
repeat : Bool True, or False repeat file reading when EOF reached.
Needs more documenation

1.8.16.6) microtune_xxxx_eval_board ( )
Type
Description
Usage
Parameters
Note

Function
Abstract class for controlling microtune xxxx eval board

Needs more documentation

1.8.16.7) microtune_4702_eval_board ( )
Type
Description
Usage
Parameters
Note

Function
Control microtune 4702 eval board

Needs more documentation

1.8.16.8) microtune_4937_eval_board ( )
Type
Description
Usage
Parameters
Note

Function
Control microtune 4937 eval board

Needs more documentation

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1.8.16.8) sdr_1000_base ( )
Type
Description

Function
Very low level interface to SDR 1000 xcvr hardware. See sdr_1000.py for a higher level
interface.

Usage
Parameters
Note

1.8.16.9) oscope_sink_f ( )
Type
Description
Usage
Parameters
Note

Function
Building block for python oscilloscope module. Accepts 1 to 16 float streams.
gr.oscope_sink_f(sampling_rate,msgq)
sampling_rate : Double represent sampling rate
msgq : Message queue
Needs more documentation

1.8.16.10) ppio ( )
Type
Description
Usage
Parameters
Note

Function
Abstract class that provides low level access to parallel port bits.

Needs more documentation

1.8.16.11) message_source ( )
Type
Description
Usage
Parameters
Note

Function
Turn received messages into a stream.
gr.message_source(itemsize,msgq_limit)
itemsize: Size of data
msgq_limit : Integer, number of messages to hold in the queue
Needs more documentation

1.8.16.12) message_sink ( )
Type
Description

Usage
Parameters

Note

Function
Gather (convert) the received items into messages and insert into a message queue.
Message type is 0, msg.arg1 will hold the itemsize, and msg.arg2 will hold number of
items in the message.
gr.message_sink(itemsize,msgq,dont_block)
itemsize: Size of data
msgq : Message queue
don’t_block : bool True or False
Needs more documentation

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1.8.16.13) udp_sink ( )
Type
Description
Usage
Parameters

Note
Sub Function 1

Sub Function 2
Sub Function 3

Function
Write stream to an UDP socket.
gr.udp_sink(itemsize, src, port_src, dst, port_dst, payload_size)
itemsize : The size (in bytes) of the item datatype
src : The source address as either the host name or the 'numbers-and-dots' IP address
port_src : Destination port to bind to (0 allows socket to choose an appropriate port)
dst : The destination address as either the host name or the 'numbers-and-dots' IP
address
port_dst : Destination port to connect to
payload_size : UDP payload size by default set to 1472 = (1500 MTU - (8 byte UDP
header) - (20 byte IP header))
gr.udp_sink.open() : open a socket specified by the port and ip address info
Opens a socket, binds to the address, and makes connectionless association over UDP.
If any of these fail, the fuction retuns the error and exits.
gr.udp_sink.close () : Close current socket. Shuts down read/write on the socket
gr.udp_sink.payload_size() : return the PAYLOAD_SIZE of the socket

1.8.16.14) udp_source ( )
Type
Description
Usage
Parameters

Note
Sub Function 1

Sub Function 2
Sub Function 3

Function
Read stream from UDP socket.
gr.udp_source(itemsize, src, port_src, payload_size)
itemsize : The size (in bytes) of the item datatype
src : The source address as either the host name or the 'numbers-and-dots' IP address
port_src : Destination port to bind to (0 allows socket to choose an appropriate port)
payload_size : UDP payload size by default set to 1472 = (1500 MTU - (8 byte UDP
header) - (20 byte IP header))
gr.udp_source.open() : open a socket specified by the port and ip address info
Opens a socket, binds to the address, and makes connectionless association over UDP.
If any of these fail, the fuction retuns the error and exits.
gr.udp_source.close () : Close current socket. Shuts down read/write on the socket
gr.udp_source.payload_size() : return the PAYLOAD_SIZE of the socket

1.8.17) gnuradio/ gr / gnuradio_swig_general.py
Type
Description
Examples
Note

Python file
This file implements the general gnuradio blocks

1.8.17.1) nop ( )
Type
Description
Usage

Function
Does nothing. Used for testing only.
gr.nop(sizeof_stream_item)

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Parameters

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sizeof_stream_item: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float
,gr_sizeof_char

Note

1.8.27.2) null_sink ( )
Type
Description
Usage
Parameters

Function
Null sink block.
gr.null_sink (sizeof_stream_item)
sizeof_stream_item: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float
,gr_sizeof_char

Note

1.8.27.3) null_source ( )
Type
Description
Usage
Parameters

Function
Null source block. A source of zeros.
gr.null_source (sizeof_stream_item)
sizeof_stream_item: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float
,gr_sizeof_char

Note

1.8.27.4) head ( )
Type
Description
Usage
Parameters

Function
Copies the first N items to the output then signals done.
gr.head (sizeof_stream_item, nitems)
sizeof_stream_item: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float
,gr_sizeof_char
nitems : Integer, number of samples to collect.

Note

1.8.27.5) skiphead ( )
Type
Description
Usage
Parameters

Function
Skips the first N items, from then on copies items to the output. Useful for building test
cases and sources which have metadata or junk at the start
gr.skiphead (sizeof_stream_item, nitems_to_skip)
sizeof_stream_item: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float
,gr_sizeof_char
nitems_to_skip : Integer, number of samples to skip

Note

1.8.27.6) quadrature_demod_cf ( )
Type
Description
Usage

Function
Quadrature demodulator: complex in, float out.This can be used to demod FM, FSK,
GMSK, etc. The input is complex baseband.
gr.quadrature_demod_cf(gain)

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Parameters
Note

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gain : float
Needs more documenation

1.8.27.7) float_to_complex ( )
Type
Description
Usage
Parameters
Note

Function
Convert 1 or 2 streams of float to a stream of gr_complex.
gr.float_to_complex()

1.8.27.8) check_counting_s ( )
Type
Description
Usage
Parameters

Function
Sink that checks if its input stream consists of a counting sequence. This sink is typically
used to test the USRP "Counting Mode" or "Counting mode 32 bit".
gr.check_counting_s(do_32bit)
do_32bit : Bool True or False, expect an interleaved 32 bit counter in stead of 16 bit
counter (default false)

Note

1.8.27.9) lfsr_32k_source_s ( )
Type
Description

Usage
Parameters
Note

Function
LFSR pseudo-random source with period of 2^15 bits (2^11 shorts). This source is
typically used along with gr_check_lfsr_32k_s to test the USRP using its digital loopback
mode.
gr.lfsr_32k_source_s()

1.8.27.10) check_lfsr_32k_s ( )
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2
Sub Function 3

Function
Sink that checks if its input stream consists of a lfsr_32k sequence. This sink is typically
used along with gr_lfsr_32k_source_s to test the USRP using its digital loopback mode.
gr.check_lfsr_32k_s()

gr.check_lfsr_32k_s.ntotal() : Return long represent total number of elements
gr.check_lfsr_32k_s.nright() : Return long represent correct number of elements
gr.check_lfsr_32k_s.runlength () : Return long represent ????????????

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1.8.27.11) stream_to_vector ( )
Type
Description
Usage
Parameters

Function
Convert a stream of items into a stream of blocks containing nitems_per_block
gr.stream_to_vector(item_size,nitems_per_block)
item_size: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
nitems_per_block : vector length

Note

1.8.27.12) vector_to_stream ( )
Type
Description
Usage
Parameters

Function
Convert a stream of blocks of nitems_per_block items into a stream of items
gr.vector_to_stream(item_size,nitems_per_block)
item_size: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
nitems_per_block : vector length

Note

1.8.27.13) keep_one_in_n ( )
Type
Description
Usage
Parameters
Note
Sub Function 1

Function
Decimate a stream, keeping one item of size (itemsize) out of every n.
gr.keep_one_in_n(item_size, n)
item_size: Item size we wish to keep
n : integer
gr.keep_one_in_n.set_n(n)

1.8.27.14) fft_vcc ( )
Type
Description
Usage
Parameters

Note
Sub Function 1
Example

Function
Compute forward or reverse FFT, complex vector in / complex vector out.
gr.fft_vcc(fft_size,forward, window, shift=false)
fft_size : integer
forward : bool True for forward FFT, False for inverse FFT
window : window vector,
shift : bool True or false
gr.fft_vcc.set_window(window)
See usrp_spectrum_sense.py

1.8.27.15) fft_vfc ( )
Type
Description
Usage
Parameters

Function
Compute forward or reverse FFT, float vector in / complex vector out.
gr.fft_vfc(fft_size,forward, window)
fft_size : integer

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forward : bool True for forward FFT, False for inverse FFT
window : window vector
Note
Sub Function 1

gr.fft_vfc.set_window(window)

1.8.27.16) float_to_short ( )
Type
Description
Usage
Parameters
Note

Function
Convert stream of float to a stream of short.
gr.float_to_short()

1.8.27.17) float_to_uchar ( )
Type
Description
Usage
Parameters
Note

Function
Convert stream of float to a stream of unsigned character.
gr.float_to_uchar()

1.8.27.18) short_ to_float ( )
Type
Description
Usage
Parameters
Note

Function
Convert stream of short to a stream of float.
gr.short_to_float()

1.8.27.19) char_to_float ( )
Type
Description
Usage
Parameters
Note

Function
Convert stream of characters to a stream of float.
gr.char_to_float()

1.8.27.20) uchar_to_float ( )
Type
Description
Usage
Parameters
Note

Function
Convert stream of unsigned characters to a stream of float.
gr.uchar_to_float()

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1.8.27.21) frequency_modulator_fc ( )
Type
Description
Usage
Parameters
Note

Function
Frequency modulator block. float input; complex baseband output
gr.frequency_modulator_fc(sensitivity)
sensitivity : double

1.8.27.22) phase_modulator_fc ( )
Type
Description
Usage
Parameters
Note

Function
Phase modulator block. output=complex(cos(in*sensitivity),sin(in*sensitivity))
gr.phase_modulator_fc(sensitivity)
sensitivity : double

1.8.27.23) bytes_to_syms ( )
Type
Description

Usage
Parameters
Note

Function
Convert stream of bytes to stream of +/- 1 symbols (Turn it to NRZ data format). Input is
a stream of bytes; output: stream of float. The combination of
gr_packed_to_unpacked_bb followed by gr_chunks_to_symbols_bf or
gr_chunks_to_symbols_bc handles the general case of mapping from a stream of bytes
into arbitrary float or complex symbols.
gr.bytes_to_syms()

1.8.27.24) simple_framer ( )
Type
Description
Usage
Parameters
Note

Function
add sync field, seq number and command field to payload
gr.simple_framer(payload_bytesize)
payload_bytesize : Integer
Needs more documenation

1.8.27.25) simple_correlator ( )
Type
Description
Usage
Parameters
Note

Function
Inverse of gr_simple_framer (more or less).
gr.simple_framer(payload_bytesize)
payload_bytesize : Integer
Needs More documenation

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1.8.27.26) align_on_samplenumbers_ss ( )
Type
Description

Usage
Parameters

Note

Function
Align several complex short (interleaved short) input channels with corresponding
unsigned 32 bit sample_counters (provided as interleaved 16 bit values). Pay attention
on how you connect this block. It expects a minimum of 2 usrp_source_s with nchan
number of channels and FPGA_MODE_COUNTING_32BIT enabled. This means that
the first complex_short channel on every input is an interleaved 32 bit counter. The
samples are aligned by dropping samples untill the samplenumbers match.
gr.align_on_samplenumbers_ss(nchan, align_interval)
nchan : of complex_short input channels (including the 32 bit counting channel)
align_interval : is after how much samples (minimally) the sample-alignement is
refreshed. Default is 128. A bigger value means less processing power but also requests
more buffer space, which has a maximum. Decrease the align_interval if you get an error
like: "sched:  is requesting more input data
than we can provide. ninput_items_required = 32768 max_possible_items_available =
16383 If this is a filter, consider reducing the number of taps."
Needs More documenation

1.8.27.27) complex_to_float ( )
Type
Description
Usage
Parameters
Note

Function
Convert a stream of gr_complex to 1 or 2 streams of float
gr.complex_to_float(vlen)
vlen :vector len (default 1)

1.8.27.28) complex_to_real ( )
Type
Description
Usage
Parameters
Note

Function
Complex in, real part out (float)
gr.complex_to_real(vlen)
vlen :vector len (default 1)

1.8.27.29) complex_to_imag ( )
Type
Description
Usage
Parameters
Note

Function
Complex in, imaginary part out (float)
gr.complex_to_imag(vlen)
vlen :vector len (default 1)

1.8.27.30) complex_to_mag ( )
Type
Description
Usage
Parameters
Note

Function
Complex in, magnitude out (float)
gr.complex_to_mag(vlen)
vlen :vector len (default 1)

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1.8.27.31) complex_to_mag_squared ( )
Type
Description
Usage
Parameters
Note

Function
Complex in, magnitude squared out (float)
gr.complex_to_mag_squared(vlen)
vlen :vector len (default 1)

1.8.27.32) complex_to_arg ( )
Type
Description
Usage
Parameters
Note

Function
complex in, angle out (float)
gr.complex_to_arg(vlen)
vlen :vector len (default 1)

1.8.27.33) complex_to_interleaved_short ( )
Type
Description
Usage
Parameters
Note

Function
Convert stream of complex to a stream of interleaved shorts.
gr.complex_to_interleaved_short()

1.8.27.34) interleaved_short_to_complex ( )
Type
Description
Usage
Parameters
Note

Function
Convert stream of interleaved shorts to a stream of complex.
gr.interleaved_short_to_ complex ()

1.8.27.35) firdes ( )
Type
Description
Note

Function
Finite Impulse Response (FIR) filter design functions.

1.8.27.35.1) firdes.low_pass ( )
Type
Description
Usage
Parameters

Sub Function
Design low pass FIR filter by using "window method"
gr.firdes. low_pass (gain,sampling_freq,cutoff_freq, transition_width, window =
WIN_HAMMING,beta = 6.76)
gain: overall gain of filter (typically 1.0)
sampling_freq: sampling freq (Hz)
cutoff_freq: center of transition band (Hz)

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Note

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transition_width: width of transition band (Hz). The normalized width of the transition
band is what sets the number of taps required. Narrow --> more taps
window: What kind of window to use. Determines maximum attenuation and passband
ripple. Available window types are:WIN_HAMMING, WIN_HANN
,
WIN_BLACKMAN ,WIN_RECTANGULAR
,WIN_KAISER
beta: parameter for Kaiser window (used only for Kaiser)
See firdes.window for windowing information

1.8.27.35.2) firdes.high_pass ( )
Type
Description
Usage
Parameters

Note

Sub Function
Design high pass FIR filter by using "window method"
gr.firdes. high_pass (gain,sampling_freq,cutoff_freq, transition_width, window =
WIN_HAMMING,beta = 6.76)
gain: overall gain of filter (typically 1.0)
sampling_freq: sampling freq (Hz)
cutoff_freq: center of transition band (Hz)
transition_width: width of transition band (Hz). The normalized width of the transition
band is what sets the number of taps required. Narrow --> more taps
window: What kind of window to use. Determines maximum attenuation and passband
ripple. Available window types are:WIN_HAMMING, WIN_HANN
,
WIN_BLACKMAN ,WIN_RECTANGULAR
,WIN_KAISER
beta: parameter for Kaiser window (used only for Kaiser)
See firdes.window for windowing information

1.8.27.35.3) firdes.band_pass ( )
Type
Description
Usage
Parameters

Note

Sub Function
Design band pass FIR filter by using "window method"
gr.firdes.band_pass (gain,sampling_freq,low_cutoff_freq, high_cutoff_freq,
transition_width, window = WIN_HAMMING,beta = 6.76)
gain: overall gain of filter (typically 1.0)
sampling_freq: sampling freq (Hz)
low_cutoff_freq: center of low transition band (Hz)
high_cutoff_freq: center of high transition band (Hz)
transition_width: width of transition band (Hz). The normalized width of the transition
band is what sets the number of taps required. Narrow --> more taps
window: What kind of window to use. Determines maximum attenuation and passband
ripple. Available window types are:WIN_HAMMING, WIN_HANN
,
WIN_BLACKMAN ,WIN_RECTANGULAR
,WIN_KAISER
beta: parameter for Kaiser window (used only for Kaiser)
See firdes.window for windowing information

1.8.27.35.4) firdes.complex_band_pass ( )
Type
Description
Usage
Parameters

Sub Function
Design complex band pass FIR filter by using "window method"
gr.firdes.complex_band_pass (gain,sampling_freq,low_cutoff_freq,
high_cutoff_freq, transition_width, window = WIN_HAMMING,beta = 6.76)
gain: overall gain of filter (typically 1.0)
sampling_freq: sampling freq (Hz)

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low_cutoff_freq: center of low transition band (Hz)
high_cutoff_freq: center of high transition band (Hz)
transition_width: width of transition band (Hz). The normalized width of the transition
band is what sets the number of taps required. Narrow --> more taps
window: What kind of window to use. Determines maximum attenuation and passband
ripple. Available window types are:WIN_HAMMING, WIN_HANN
,
WIN_BLACKMAN ,WIN_RECTANGULAR
,WIN_KAISER
beta: parameter for Kaiser window (used only for Kaiser)
See firdes.window for windowing information

1.8.27.35.5) firdes.band_reject ( )
Type
Description
Usage
Parameters

Note

Sub Function
Design band reject FIR filter by using "window method"
gr.firdes.band_reject (gain,sampling_freq,low_cutoff_freq, high_cutoff_freq,
transition_width, window = WIN_HAMMING,beta = 6.76)
gain: overall gain of filter (typically 1.0)
sampling_freq: sampling freq (Hz)
low_cutoff_freq: center of low transition band (Hz)
high_cutoff_freq: center of high transition band (Hz)
transition_width: width of transition band (Hz). The normalized width of the transition
band is what sets the number of taps required. Narrow --> more taps
window: What kind of window to use. Determines maximum attenuation and passband
ripple. Available window types are:WIN_HAMMING, WIN_HANN
,
WIN_BLACKMAN ,WIN_RECTANGULAR
,WIN_KAISER
beta: parameter for Kaiser window (used only for Kaiser)
See firdes.window for windowing information

1.8.27.35.6) firdes.hilbert ( )
Type
Description
Usage
Parameters

Note

Sub Function
Design Hilbert Transform FIR filter by using "window method"
gr.firdes.hilbert (ntaps=19, windowtype = WIN_ RECTANGULAR,beta = 6.76)
ntaps: Number of taps, must be odd
windowtype: What kind of window to use. Determines maximum attenuation and
passband ripple. Available window types are:WIN_HAMMING, WIN_HANN
,
WIN_BLACKMAN ,WIN_RECTANGULAR
,WIN_KAISER
beta: parameter for Kaiser window (used only for Kaiser)
See firdes.window for windowing information

1.8.27.35.7) firdes.root_raised_cosine ( )
Type
Description
Usage
Parameters

Note

Sub Function
Design a root raised cosine FIR filter
gr.firdes.root_raised_cosine (gain, sampling_freq, symbol_rate, alpha, taps)
gain: overall gain of filter (typically 1.0)
sampling_freq: sampling freq (Hz)
symbol_rate: symbol rate NOT bitrate (unless BPSK), must be a factor of sample rate
alpha: excess bandwidth factor
ntaps: number of taps

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1.8.27.35.8) firdes.gaussian ( )
Type
Description
Usage
Parameters

Sub Function
Design a gaussian FIR filter
gr.firdes.gaussian (gain, spb, bt, ntaps)
gain: overall gain of filter (typically 1.0)
spb: symbols per bit, symbol rate, must be a factor of sample rate
bt : Bandwidth to bit rate ratio (bandwidth * symbol time)
ntaps: number of taps

Note

1.8.27.35.9) firdes.window ( )
Type
Description
Usage
Parameters

Note

Sub Function
Window taps maker
gr.firdes.window (type, ntaps, beta)
type: window type, one of :
WIN_HAMMING : Maximum Attenuation 53dB
WIN_HANN : Maximum Attenuation 44dB
WIN_BLACKMAN : Maximum Attenuation 74dB
WIN_RECTANGULAR ,
WIN_KAISER : max attenuation a function of beta, google it
ntaps: number of taps
beta: parameter for Kaiser window (used only for Kaiser)
The usage of these window types is as followes :
gr.firdes. WIN_HAMMING
gr.firdes. WIN_HANN
gr.firdes. WIN_BLACKMAN
gr.firdes. WIN_RECTANGULAR ,
gr.firdes. WIN_KAISER

1.8.27.36) interleave ()
Type
Description
Usage
Parameters
Note

Function
Interleave N inputs to a single output
gr.interleave(item_size)
Item_size: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char

1.8.27.37) deinterleave ()
Type
Description
Usage
Parameters
Note

Function
Deinterleave a single input into N outputs
gr.deinterleave(item_size)
Item_size: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char

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1.8.27.38) delay ()
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
Delay the input by a certain number of samples
gr.delay(itemsize, delay)
Itemsize: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
delay : Integer, number of samples
gr.delay.set_delay (delay) : Set block delay.
gr.delay.delay () : Return block delay.

1.8.27.39) simple_sequelch_cc ()
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5

Function
Simple squelch block based on average signal power and threshold in dB. Output equal
input if not muted.
gr.simple_squelch_cc(threshold_db, alpha)
threshold_db : double
alpha : Double , the gain value of a moving average filter (Time Constant in sec)
Needs more documenation
gr.simple_sequelch_cc.set_threshold(decibels)
gr.simple_sequelch_cc.set_alpha(alpha)
gr.simple_sequelch_cc.threshold() : Return block threshold
gr.simple_sequelch_cc.unmuted() : Return bool True or False
gr.simple_sequelch_cc.squelch_range() : Return float vector represents sequelch range

1.8.27.40) agc_xx ()
Type
Description

Usage
Parameters

Note

Function
High performance Automatic Gain Control class.
agc_cc : The Power is calculated by the absolute value of the complex number.
agc_ff : Power is approximated by absolute value.
gr.agc_xx (rate, refrence, gain, max_gain)
rate :float (Time Constant in Sec)
refrence : float refrence power
gain : float Initial gain
max_gain : float maximum gain
Needs more documentation

1.8.27.41) gri_agc_xx ()
Type
Description

Usage
Parameters

Function
High performance Automatic Gain Control class
gri_agc_cc: The Power is calculated by the absolute value of the complex number.
gri_agc_ff : Power is approximated by absolute value
gr.gri_agc_xx(rate=1e-4, refrence=1.0, gain=1.0, max_gain=0.0)
rate :float (Time Constant in Sec)
refrence : float refrence power
gain : float Initial gain
max_gain : float maximum gain

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Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9
Sub Function 10

Page 108 of 208

Needs more documentation
gr.gri_agc_xx.rate() : Return rate
gr.gri_agc_xx.refrence() : Return refrence
gr.gri_agc_xx.gain() : Return gain
gr.gri_agc_xx.max_gain() : Return max gain
gr.gri_agc_xx.set_rate() : Set rate
gr.gri_agc_xx.set_refrence() : Set refrence
gr.gri_agc_xx.set_gain() : Set gain
gr.gri_agc_xx.set_max_gain() : Set max gain
gr.gri_agc_xx.scale (input) : ?????????????
gr.gri_agc_xx.scaleN (output [ ], input [ ], n) : ?????????????

1.8.27.42) gri_agc2_xx ()
Type
Description

Function
High performance Automatic Gain Control class
gri_agc2_cc : For Power the absolute value of the complex number is used.
gri_agc2_ff : Power is approximated by absolute value
gr.gri_agc2_xx(attack_rate=1e-1, decay_rate=1e-2,refrence=1, gain=1,
max_gain=0.0)
attack_rate :float
decay_rate : float
refrence : float refrence power
gain : float initial gain
max_gain : float
Needs more documentation
gr.gri_agc_xx.attack_rate() : Return attack_rate
gr.gri_agc_xx.refrence() : Return refrence
gr.gri_agc_xx.gain() : Return gain
gr.gri_agc_xx.max_gain() : Return max gain
gr.gri_agc_xx.set_attack_rate() : Set attack_rate
gr.gri_agc_xx.set_refrence() : Set refrence
gr.gri_agc_xx.set_gain() : Set gain
gr.gri_agc_xx.set_max_gain() : Set max gain
gr.gri_agc_xx.scale (input) : ?????????????
gr.gri_agc_xx.scaleN (output [ ], input [ ], n) : ?????????????
gr.gri_agc_xx.decay_rate() : Return decay_rate
gr.gri_agc_xx.set_decay_rate() : Set decay_rate

Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9
Sub Function 10
Sub Function 11
Sub Function 12

1.8.27.43) rms_xx ()
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2

Function
RMS average power.
rms_cf : Input is complex, output is float
rms_ff : Input is float, output is float.
gr.rms_xx(alpha)
alpha : Double , the gain value of a moving average filter (Time Constant in sec)
Needs more documentation
gr.rms_xx.unmuted() : Return bool True or False
gr.rms_xx_set_alpha(alpha) : Set alpha

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1.8.27.44) nlog10_ff ()
Type
Description
Usage
Parameters

Function
Output = n*log10(input) + k
gr.nlog10_ff(n, vlen, k)
n : Float
vlen : Unsigned Integer vector length
k : float

Note

1.8.27.45) fake_channel_encoder_pp ()
Type
Description
Usage
Parameters

Function
Pad packet with alternating 1,0 pattern. Input: stream of byte vectors; output: stream of
byte vectors
gr.fake_channel_encoder_pp(input_vlen, output_vlen)
input_vlen : Integer
output_vlen : Integer

Note

1.8.27.46) fake_channel_decoder_pp ()
Type
Description
Usage
Parameters

Function
Remove fake padding from packet. Input: stream of byte vectors; output: stream of byte
vectors
gr.fake_channel_decoder_pp(input_vlen, output_vlen)
input_vlen : Integer
output_vlen : Integer

Note

1.8.27.47) throttle ()
Type
Description
Usage
Parameters

Function
Throttle flow of samples such that the average rate does not exceed samples_per_sec.
Input: one stream of itemsize; output: one stream of itemsize
gr.throttle(item_size, samples_per_sec)
itemsize: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char
samples_per_sec : Double

Note

1.8.27.48) mpsk_receiver_cc ()
Type
Description

Function
This block takes care of receiving M-PSK modulated signals through phase, frequency,

Simple Gnuradio User Manual

Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9
Sub Function 10
Sub Function 11
Sub Function 12
Sub Function 13
Sub Function 14
Sub Function 15
Sub Function 16

Page 110 of 208

and symbol synchronization. It performs carrier frequency and phase locking as well as
symbol timing recovery. It works with (D) BPSK, (D)QPSK, and (D)8PSK as tested
currently. It should also work for OQPSK and PI/4 DQPSK.
The phase and frequency synchronization are based on a Costas loop that finds the
error of the incoming signal point compared to its nearest constellation point. The
frequency and phase of the NCO are updated according to this error. There are
optimized phase error detectors for BPSK and QPSK, but 8PSK is done using a bruteforce computation of the constellation points to find the minimum.
The symbol synchronization is done using a modified Mueller and Muller circuit from
the paper:
G. R. Danesfahani, T.G. Jeans, "Optimisation of modified Mueller and Muller
algorithm," Electronics Letters, Vol. 31, no. 13, 22 June 1995, pp. 1032 - 1033.
This circuit interpolates the downconverted sample (using the NCO developed by the
Costas loop) every mu samples, then it finds the sampling error based on this and the
past symbols and the decision made on the samples. Like the phase error detector,
there are optimized decision algorithms for BPSK and QPKS, but 8PSK uses another
brute force computation against all possible symbols. The modifications to the M&M
used here reduce self-noise.
gr.mpsk_receiver_cc(M, theta, alpha, beta, fmin, fmax, mu, gain_mu, omega,
gain_omega, omega_rel)
M : Modulation order of the M-PSK modulation. The constructor also chooses which
phase detector and decision maker to use in the work loop based on the value of M.
theta : Any constant phase rotation from the real axis of the constellation
alpha gain parameter to adjust the phase in the Costas loop (~0.01)
beta : Gain parameter to adjust the frequency in the Costas loop (~alpha^2/4)
fmin : Minimum normalized frequency value the loop can achieve
fmax : Maximum normalized frequency value the loop can achieve
mu : Initial parameter for the interpolator [0,1]
gain_mu : Gain parameter of the M&M error signal to adjust mu (~0.05)
omega :Initial value for the number of symbols between samples (~number of
samples/symbol)
gain_omega : Gain parameter to adjust omega based on the error (~omega^2/4)
omega_rel :Sets the maximum (omega*(1+omega_rel)) and minimum
(omega*(1+omega_rel)) omega (~0.005)
gr.mpsk_receiver_cc.mu() : (M&M) Returns current value of mu
gr.mpsk_receiver_cc.omega() : (M&M) Returns current value of omega
gr.mpsk_receiver_cc.gain_mu() : M&M) Returns mu gain factor
gr.mpsk_receiver_cc.gain_omega() : (M&M) Returns omega gain factor
gr.mpsk_receiver_cc.set_mu() : (M&M) Set value of mu
gr.mpsk_receiver_cc. set_omega() : (M&M) Set value of omega
gr.mpsk_receiver_cc. set_gain_mu() : M&M) Set mu gain factor
gr.mpsk_receiver_cc. set_gain_omega() : (M&M) Set omega gain factor
gr.mpsk_receiver_cc.alpha() : (CL) Returns the value for alpha (the phase gain term)
gr.mpsk_receiver_cc.beta() : (CL) Returns the value of beta (the frequency gain term)
gr.mpsk_receiver_cc.freq() : (CL) Returns the current value of the frequency of the
NCO in the Costas loop
gr.mpsk_receiver_cc.phase() : (CL) Returns the current value of the phase of the NCO
in the Costal loop
gr.mpsk_receiver_cc.set_alpha() : (CL) Sets the value for alpha (the phase gain term)
gr.mpsk_receiver_cc. set_beta() : (CL) (CL) Setss the value of beta (the frequency
gain term)
gr.mpsk_receiver_cc. set_freq() : (CL) (CL) Sets the current value of the frequency of
the NCO in the Costas loop
gr.mpsk_receiver_cc. set_phase() : (CL) Setss the current value of the phase of the
NCO in the Costal loop

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1.8.27.49) stream_mux ()
Type
Description

Usage
Parameters

Function
Creates a stream muxing block to multiplex many streams into one with a specified
format. Muxes N streams together producing an output stream that contains N0 items
from the first stream, N1 items from the second, etc. and repeats:[N0, N1, N2, ..., Nm,
N0, N1, ...]
gr.stream_mux(item_size, lengths)
itemsize : The item size of the stream
lengths : A vector (list/tuple) specifying the number of items from each stream the mux
together. Warning: this requires that at least as many items per stream are available or
the system will wait indefinitely for the items.

Note

1.8.27.50) stream_to_streams ()
Type
Description
Usage
Parameters

Function
Convert a stream of items into a N streams of items. Converts a stream of N items into N
streams of 1 item. Repeat and infinitum
gr.stream_to_streams(item_size, nstreams)
itemsize : The item size of the stream
nstreams : Number of streams

Note

1.8.27.51) streams_to_stream ()
Type
Description
Usage
Parameters

Function
Convert N streams of 1 item into a 1 stream of N items. Convert N streams of 1 item into
1 stream of N items. Repeat and infinitum.
gr.streams_to_stream(item_size, nstreams)
itemsize : The item size of the stream
nstreams : Number of streams

Note

1.8.27.52) streams_to_vector ()
Type
Description
Usage
Parameters

Function
Convert N streams of items to 1 stream of vector length N
gr.streams_to_vector(item_size, nstreams)
itemsize : The item size of the stream
nstreams : Number of streams

Note

1.8.27.53) stream_to_vector ()
Type
Description
Usage
Parameters

Function
Convert a stream of items into a stream of blocks containing nitems_per_block
gr.stream_to_vector(item_size, nitems_per_block)
itemsize : The item size of the stream

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nitems_per_block : Number of items in the vector
Note

1.8.27.54) vector_to_ streams ()
Type
Description
Usage
Parameters

Function
Convert 1 stream of vectors of length N to N streams of items.
gr.vector_to_streams(item_size, nstreams)
itemsize : The item size of the stream
nstreams : Number of streams

Note

1.8.27.55) vector_to_stream ()
Type
Description
Usage
Parameters

Function
Convert a stream of blocks of nitems_per_block items into a stream of items
gr. vector_to_stream(item_size, nitems_per_block)
itemsize : The item size of the stream
nitems_per_block : Number of items in the vector

Note

1.8.27.56) conjugate_cc ()
Type
Description
Usage
Parameters
Note

Function
output = complex conjugate of input
gr. conjugate_cc()

1.8.27.57) vco_f ()
Type
Description
Usage
Parameters

Function
VCO - Voltage controlled oscillator. input: float stream of control voltages; output: float
oscillator output
gr. vco_f(sampling_rate, sensitivity, amplitude)
sampling_rate : sampling rate (Hz)
sensitivity : units are radians/sec/volt
amplitude : output amplitude

Note

1.8.27.58) threshold_ff ()
Type
Description

Function

??????????????????????

Simple Gnuradio User Manual

Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6

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gr. threshold_ff(lo,hi,initial_state)
lo : Low threshold value
hi : High threshold value
initial_state: ???????????????
Needs more documentation
gr.threshold_ff.lo() :
gr.threshold_ff.hi() :
gr.threshold_ff.last_state() :
gr.threshold_ff.set_lo() :
gr.threshold_ff.set_hi() :
gr.threshold_ff.set_last_state() :

1.8.27.59) clock_recovery_mm_xx ()
Type
Description

Usage
Parameters

Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9

Function
This implements the Mueller and Müller (M&M) discrete-time error-tracking synchronizer.
The clock recovery block trucks the symbol clock and resamples as needed. The output
of the block is a stream of soft symbols.
The complex version here is based on: Modified Mueller and Muller clock recovery circuit
Based: G. R. Danesfahani, T.G. Jeans, "Optimisation of modified Mueller and Muller
algorithm," Electronics Letters, Vol. 31, no. 13, 22 June 1995, pp. 1032 - 1033.
clock_recovery_mm_cc : Mueller and Müller (M&M) based clock recovery block with
complex input, complex output.
clock_recovery_mm_ff : Mueller and Müller (M&M) based clock recovery block with
float input, float output.
gr. clock_recovery_mm_xx(omega, gain_omega, mu, gain_mu,
omega_relative_limit)
omega :initial value for the number of symbols between samples (~number of
samples/symbol)
gain_omega : Gain parameter to adjust omega based on the error
mu : Initial parameter for the interpolator
gain_mu : Gain parameter of the M&M error signal to adjust mu
omega_relative_limit :Sets the maximum and minimum omega
Needs more documentation
gr. clock_recovery_mm_xx.omega() : Return omega
gr. clock_recovery_mm_xx.mu() : Return mu
gr. clock_recovery_mm_xx.gain_omega() : Return gain_omega
gr. clock_recovery_mm_xx.gain_mu() : Return gain_mu
gr. clock_recovery_mm_xx.set_omega(omega) : Set omega
gr. clock_recovery_mm_xx.set_mu(mu) : Set mu
gr. clock_recovery_mm_xx.set_gain_omega(gain_omega) : Set gain_omega
gr. clock_recovery_mm_xx.set_gain_mu(gain_mu) : Set gain_mu
gr. clock_recovery_mm_xx.set_verbose(verbose) : Set printing

1.8.27.60) dd_mpsk_sync_cc ()
Type
Description

Usage
Parameters

Function
Decision directed M-PSK synchronous demod This block performs joint carrier tracking
and symbol timing recovery. Input: complex baseband; output: properly timed complex
samples ready for slicing. At this point, it handles only QPSK.
gr.dd_mpsk_sync_cc(alpha, beta, max_freq, min_freq, ref_phase, omega,
gain_omega,mu, gain_mu)
alpha : Gain parameter to adjust the phase in the Costas loop
beta : Gain parameter to adjust the frequency in the Costas loop

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Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8

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min_freq : Minimum normalized frequency value the loop can achieve
max_freq : Maximum normalized frequency value the loop can achieve
ref_phase: ??????????????
mu : Initial parameter for the interpolator
gain_mu : Gain parameter of the M&M error signal to adjust mu
omega :Initial value for the number of symbols between samples (~number of
samples/symbol)
gain_omega : Gain parameter to adjust omega based on the error
Needs more documentation
gr.mpsk_ sync _cc.mu() : (M&M) Returns current value of mu
gr.mpsk_ sync_cc.omega() : (M&M) Returns current value of omega
gr.mpsk_ sync _cc.gain_mu() : M&M) Returns mu gain factor
gr.mpsk_ sync _cc.gain_omega() : (M&M) Returns omega gain factor
gr.mpsk_ sync _cc.set_mu() : (M&M) Set value of mu
gr.mpsk_ sync _cc. set_omega() : (M&M) Set value of omega
gr.mpsk_ sync _cc. set_gain_mu() : M&M) Set mu gain factor
gr.mpsk_ sync _cc. set_gain_omega() : (M&M) Set omega gain factor

1.8.27.61) packet_sink ()
Type
Description
Usage
Parameters

Note
Sub Function 1

Function
Process received bits looking for packet sync, header, and process bits into packet
gr.packet_sink(sync_vector, target_queue, threshold)
sync_vector: vector of unsigned charaters.
target_gueue : message queue
threshold : Integer
Needs more documentation
gr.packet_sink.carrier_sensed() : Return true if we detect carrier

1.8.27.62) lms_dfe_xx ()
Type
Description

Usage
Parameters
Note

Function
Least-Mean-Square Decision Feedback Equalizer.
lms_dfe_cc : complex in/out
lms_dfe_ff : float in/out
gr.lms_dfe_xx(lambda_ff, lambda_fb, num_fftaps, num_fbtaps)
Needs more documentation

1.8.27.63) dpll_bb ()
Type
Description
Usage
Parameters
Note

Function
Detect the peak of a signal. If a peak is detected, this block outputs a 1, else it outputs
0's.
gr.dpll_bb(period, gain)
period : ????????
gain : ???????
Needs more documentation

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1.8.27.64) pll_freqdet_cf ()
Type
Description

Usage
Parameters

Note

Function
Implements a PLL which locks to the input frequency and outputs an estimate of that
frequency. Useful for FM Demod. input: stream of complex; output: stream of floats.
This PLL locks onto a [possibly noisy] reference carrier on the input and outputs an
estimate of that frequency in radians per sample. All settings max_freq and min_freq are
in terms of radians per sample, NOT HERTZ. Alpha is the phase gain (first order, units of
radians per radian) and beta is the frequency gain (second order, units of radians per
sampl per radian)
gr.pll_freqdet_cf(alpha, beta, max_freq, min_freq)
alpha :
beta :
max_freq :
min_freq :
Needs more documentation

1.8.27.65) pll_refout_cc ()
Type
Description

Usage
Parameters

Note
Example

Function
Implements a PLL which locks to the input frequency and outputs a carrier.
input: stream of complex; output: stream of complex. This PLL locks onto a [possibly
noisy] reference carrier on the input and outputs a clean version which is phase and
frequency aligned to it.
All settings max_freq and min_freq are in terms of radians per sample, NOT HERTZ.
Alpha is the phase gain (first order, units of radians per radian) and beta is the frequency
gain (second order, units of radians per sample per radian)
gr.pll_refout_cc(alpha, beta, max_freq, min_freq)
alpha :
beta :
max_freq :
min_freq :
1) Needs more documentation
2) If alpha = x, it was suggested that beta = 0.25 * x * x
See hfx2.py in apps

1.8.27.66) pll_carriertracking_cc()
Type
Description

Usage
Parameters

Function
Implements a PLL which locks to the input frequency and outputs the input signal mixed
with that carrier. input: stream of complex; output: stream of complex
This PLL locks onto a [possibly noisy] reference carrier on the input and outputs that
signal, downconverted to DC
All settings max_freq and min_freq are in terms of radians per sample, NOT HERTZ.
Alpha is the phase gain (first order, units of radians per radian) and beta is the frequency
gain (second order, units of radians per sample per radian)
gr.pll_carriertracking_cc(alpha, beta, max_freq, min_freq)
alpha :
beta :
max_freq :
min_freq :

Simple Gnuradio User Manual

Note
Sub Function 1
Sub Function 2
Sub Function 3

Page 116 of 208

Needs more documentation
gr.pll_carriertracking_cc.lock_detector() : Return bool True or False
gr.pll_carriertracking_cc.set_lock_threshold(value) : Set threshold value
gr.pll_carriertracking_cc.squelch_enable(on) : Set /reset squelch

1.8.27.67) pn_correlator_cc ()
Type
Description
Usage
Parameters

Note

Function
PN code sequential search correlator. Receives complex baseband signal, outputs
complex correlation against reference PN code, one sample per PN code period
gr.pn_correlator_cc(degree, mask, seed)
degree:
mask :
seed :
Needs more documentation

1.8.27.68) probe_signal_f ()
Type
Description
Usage
Parameters
Note
Sub Function 1
Example

Function
Sink that allows a samples ruuning in stream to be grabbed from Python.
gr.probe_signal_f()
Needs more documenation
gr.probe_signal_f.level() : Return probed signal level
See radio.py in apps

1.8.27.69) probe_avg_mag_sqrd_xx ()
Type
Description

Usage
Parameters
Note
Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Example

Function
Sink that allows a samples ruuning in stream to be grabbed from Python. It computes
avg magnitude squared. Compute a running average of the magnitude squared of the
the input. The level and indication as to whether the level exceeds threshold can be
retrieved with the level and unmuted accessors.
probe_avg_mag_sqrd_c : input: gr_complex
probe_avg_mag_sqrd_f : input: float
probe_avg_mag_sqrd_cf : input: gr_complex, output : gr_float
gr.proble_avg_mag_sqrd_xx(threshold_db, alpha)
threshold_db : The threshold value in dB
alpha: The gain value (float) of a moving average filter (Time Constant in sec)
Needs more documenation
gr.probe_ avg_mag_sqrd_xx.level() : Return double represent the probed level
gr.probe_ avg_mag_sqrd_xx.thresholdl() : Return double represent block threshold
gr.probe_ avg_mag_sqrd_xx.unmuted() : Return bool True or False
gr.probe_ avg_mag_sqrd_xx.set_thresholdl() : Set threshold
gr.probe_ avg_mag_sqrd_xx.set_alpha() : Set alpha
See receive-path.py in digital folder

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1.8.27.70) ofdm_correlator ()
Type
Description

Usage
Parameters

Note
Sub Function 1
Example

Function
Build an OFDM correlator and equalizer.Take a vector of complex constellation points in
from an FFT and performs a correlation and equalization. blocks
This block takes the output of an FFT of a received OFDM symbol and finds the start of a
frame based on two known symbols. It also looks at the surrounding bins in the FFT
output for the correlation in case there is a large frequency shift in the data. This block
assumes that the fine frequency shift has already been corrected and that the samples
fall in the middle of one FFT bin.
It then uses one of those known symbols to estimate the channel response over all
subcarriers and does a simple 1-tap equalization on all subcarriers. This corrects for the
phase and amplitude distortion caused by the channel.
gr.ofdm_correlator(occupied_carriers, fft_length, cplen, known_symbol1,
known_symbol2, max_fft_shift_len)
occupied_carriers The number of subcarriers with data in the received symbol
fft_length The size of the FFT vector (occupied_carriers + unused carriers)
known_symbol1 A vector of complex numbers representing a known symbol at the start
of a frame (usually a BPSK PN sequence)
known_symbol2 A vector of complex numbers representing a known symbol at the start
of a frame after known_symbol1 (usually a BPSK PN sequence). Both of these start
symbols are differentially correlated to compensate for phase changes between symbols.
max_fft_shift_len Set's the maximum distance you can look between bins for
correlation
Needs more documenation
gr. ofdm_correlator.snr () : Return an estimate of the SNR of the channel.

1.8.27.71) ofdm_cyclic_prefixer ()
Type
Description
Usage
Parameters
Note
Example

Function
Adds a cyclic prefix vector to an input size long ofdm symbol (vector) and converts vector
to a stream output_size long.
gr.ofdm_cyclic_prefixer(input_size, output_size)
input_size: ??????????
output_size: ????????????
Needs more documenation

1.8.27.72) ofdm_bpsk_mapper ()
Type
Description
Usage
Parameters

Note
Sub Function 1
Example

Function
Take a message in and map to a vector of complex constellation points suitable for IFFT
input to be used in an ofdm modulator. Simple BPSK version.
gr.ofdm_bpsk_mapper (msgq_limit, occupied_carriers, fft_length)
msgq_limit: maximum number of messages in message queue
occupied_carriers: ????????
fft_length : FFT length
Needs more documentation
gr.ofdm_bpsk_mapper.msgq() : Return a pointer to msg queue

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1.8.27.73) ofdm_bpsk_demapper ()
Type
Description
Usage
Parameters
Note
Example

Function
Take a vector of complex constellation points in from an FFT and demodulate to a
stream of bits. Simple BPSK version.
gr.ofdm_bpsk_demapper (occupied_carriers)
occupied_carriers: ????????
Needs more documentation

1.8.27.74) ofdm_ mapper_bcv ()
Type
Description

Usage
Parameters

Note
Sub Function 1
Example

Function
Take a stream of bytes in and map to a vector of complex constellation points suitable for
IFFT input to be used in an ofdm modulator. Abstract class must be subclassed with
specific mapping.
gr.ofdm_mapper_bcv (constellation, msgq_limit, occupied_carriers, fft_length)
constellation : vector of complex data
msgq_limit: maximum number of messages in message queue
occupied_carriers:????????
fft_length : FFT length
Needs more documentation
gr.ofdm_mapper_bcv.msgq() : Return a pointer to msg queue

1.8.27.75) ofdm_qpsk_mapper ()
Type
Description
Usage
Parameters

Note
Sub Function 1
Example

Function
Take a message in and map to a vector of complex constellation points suitable for IFFT
input to be used in an ofdm modulator. Simple QPSK version.
gr.ofdm_qpsk_mapper (msgq_limit, occupied_carriers, fft_length)
msgq_limit: maximum number of messages in message queue
occupied_carriers: ????????
fft_length : FFT length
Needs more documentation
gr.ofdm_qpsk_mapper.msgq() : Return a pointer to msg queue

1.8.27.76) ofdm_qam_mapper ()
Type
Description
Usage
Parameters

Note
Sub Function 1
Example

Function
Take a message in and map to a vector of complex constellation points suitable for IFFT
input to be used in an ofdm modulator. Simple QAM version.
gr.ofdm_qam_mapper (msgq_limit, occupied_carriers, fft_length, m)
msgq_limit: maximum number of messages in message queue
occupied_carriers : ????????
fft_length : FFT length
m : ??????????
Needs more documentation
gr.ofdm_qam_mapper.msgq() : Return a pointer to msg queue

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1.8.27.77) ofdm_frame_sink ()
Type
Description

Usage
Parameters

Note
Example

Function
Takes an OFDM symbol in, demaps it into bits of 0's and 1's, packs them into packets,
and sends to to a message queue sink.
NOTE: The mod input parameter simply chooses a pre-defined demapper/slicer.
Eventually, we want to be able to pass in a reference to an object to do the demapping
and slicing for a given modulation type.
gr.ofdm_frame_sink (sym_position, sym_value_out, target_queue,
occupied_tones)
sym_position : vector of complex
sym_value_out : vector of unsigned characters
target_queue : point to message queue
occupied_tones : Integer
Needs more documentation

1.8.27.78) ofdm_insert_preamble ()
Type
Description

Usage
Parameters
Note
Example

Function
Insert "pre-modulated" preamble symbols before each payload.
Input 1: stream of vectors of gr_complex [fft_length]. These are the modulated symbols
of the payload.
Input 2: stream of char. The LSB indicates whether the corresponding symbol on input 1
is the first symbol of the payload or not. It's a 1 if the corresponding symbol is the first
symbol; otherwise 0.This implies that there must be at least 1 symbol in the payload.
Output 1: stream of vectors of gr_complex [fft_length] These include the preamble
symbols and the payload symbols.
Output 2: stream of char. The LSB indicates whether the corresponding symbol on input
1 is the first symbol of a packet (i.e., the first symbol of the preamble.) It's a 1 if the
corresponding symbol is the first symbol, otherwise 0.
gr.ofdm_insert_preamble(fft_length, preamble)
fft_length : FFT length
preamble : vector of complex vectors
Needs more documentation

1.8.27.79) ofdm_sampler ()
Type
Description
Usage
Parameters
Note
Example

Function
Does the rest of the OFDM stuff ??????????????
gr.ofdm_sampler(fft_length, symbol_length)
fft_length : FFT length
symbol_length: ??????????????????
Needs more documentation

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1.8.27.80) regenerate_bb ()
Type
Description

Usage
Parameters

Note
Sub Function 1
Sub Function 2

Function
Make a regenerate block. Detect the peak of a signal and repeat every period samples.
If a peak is detected, this block outputs a 1 repeated every period samples until reset by
detection of another 1 on the input or stopped after max_regen regenerations have
occurred.
Note that if max_regen= (-1)/ULONG_MAX, then the regeneration will run forever.
gr.regenerate_bb(period, max_regen)
period : The number of samples between regenerations
max_regen : The maximum number of regenerations to perform; if set to ULONG_MAX,
it will regenerate continuously.
Needs more documentation
gr.regenerate_bb.set_max_regen (regen) : Reset the maximum regeneration count; this
will reset the current regen.
gr.regenerate_bb.set_period (period) : Reset the period of regenerations; this will reset
the current regen.

Example

1.8.27.81) costas_loop_cc ()
Type
Description

Usage
Parameters

Note
Example

Function
A Costas loop carrier recovery module. Carrier tracking PLL for QPSK. Input: complex;
output: complex .The Costas loop can have two output streams: stream 1 is the
baseband I and Q; stream 2 is the normalized frequency of the loop order must be 2 or 4.
The Costas loop locks to the center frequency of a signal and downconverts it to
baseband. The second (order=2) order loop is used for BPSK where the real part of the
output signal is the baseband BPSK signal and the imaginary part is the error signal.
When order=4, it can be used for quadrature modulations where both I and Q (real and
imaginary) are outputted.
More details can be found online:
J. Feigin, "Practical Costas loop design: Designing a simple and inexpensive BPSK
Costas loop carrier recovery circuit," RF signal processing, pp. 20-36, 2002.
http://rfdesign.com/images/archive/0102Feigin20.pdf
gr.costas_loop_cc(alpha, beta, max_freq, min_freq, order)
alpha : The loop gain used for phase adjustment
beta : The loop gain for frequency adjustments
max_freq:The maximum frequency deviation (normalized frequency) the loop can
handle
min_freq : The minimum frequency deviation (normalized frequency) the loop can
handle
order : The loop order, either 2 or 4
Needs more documentation

1.8.27.82) pa_2x2_phase_combiner ()
Type
Description
Usage
Parameters
Note
Sub Function 1
Sub Function 2
Example

Function
pa_2x2 phase combiner. Anntenas are arranged like this: 2 3 0 1
dx and dy are lambda/2.
gr.pa_2x2_phase_combiner()
Needs more documentation
gr.pa_2x2_phase_combiner.theta() : Return theta
gr.pa_2x2_phase_combiner.set_theta(theta) : Set theta (float)

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1.8.27.83) kludge_copy ()
Type
Description
Usage
Parameters
Note
Example

Function
output[i] = input[i] .This is a short term kludge to work around a problem with the
hierarchical block impl.
gr.kludge_copy(itemsize)
itemsize: One of gr.sizeof_short, gr.sizeof_gr_complex, gr.sizeof_float ,gr_sizeof_char

1.8.27.84) prefs ()
Type
Description

Usage
Parameters
Note
Example

Function
Base class for representing user preferences in windows INI files. The real
implementation is in Python, and is accessable from C++ via the magic of SWIG
directors.

Needs more documentation

1.8.27.85) test ()
Type
Description

Usage
Parameters
Note
Example

Function
Test class for testing runtime system (setting up buffers and such.). This block does not
do any usefull actual data processing. It just exposes setting all standard block
parameters using the contructor or public methods. This block can be usefull when
testing the runtime system. You can force this block to have a large history, decimation
factor and/or large output_multiple. The runtime system should detect this and create
large enough buffers all through the signal chain.

Needs more documentation

1.8.27.86) unpack_k_bits_bb ()
Type
Description
Usage
Parameters
Note
Example

Function
Converts a byte with k relevent bits to k output bytes with 1 bit in the LSB.
gr.unpack_k_bits_bb(k)
Needs more documentation

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1.8.27.87) correlate_access_code_bb ()
Type
Description

Usage
Parameters
Note
Sub Function 1
Example

Function
Examine input for specified access code, one bit at a time. Input: stream of bits, 1 bit per
input byte (data in LSB), output: stream of bits, 2 bits per output byte (data in LSB, flag in
next higher bit). Each output byte contains two valid bits, the data bit, and the flag bit.
The LSB (bit 0) is the data bit, and is the original input data, delayed 64 bits. Bit 1 is the
flag bit and is 1 if the corresponding data bit is the first data bit following the access code.
Otherwise the flag bit is 0.
gr.correlate_access_code_bb(access_code, threshold)
access_code : is string represented with 1 byte per bit, e.g., "010101010111000100"
threshold : maximum number of bits that may be wrong
Needs more documentation
gr.correlate_access_code_bb.set_access_code(access_code)

1.8.27.88) diff_phasor_cc ()
Type
Description
Usage
Parameters
Note
Example

Function
????????????????????

Needs more documentation

1.8.27.89) constellation_decoder_cb ()
Type
Description
Usage
Parameters
Note
Sub Function 1
Example

Function
????????????????????
gr. constellation_decoder_cb(sym_position, sym_value_out)
sym_position : vector of complex
sym_value_out : vector of unsigned charaters
Needs more documentation
gr. constellation_decoder_cb.set_constellation(sym_position, sym_value_out)

1.8.27.90) binary_slicer_fb ()
Type
Description
Usage
Parameters
Note
Example

Function
Slice float binary symbol outputting 1 bit output (the LSB of the output byte) per sample.
If x <0 then output 0. If x >=0 then output 1
gr. binary_slicer_fb()

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1.8.27.91) diff_encoder_bb ()
Type
Description
Usage
Parameters
Note
Example

Function
Differential encoder.y[0] = (x[0] + y[-1]) % M
gr. diff_encoder_bb(modulus)

1.8.27.92) diff_decoder_bb ()
Type
Description
Usage
Parameters
Note
Example

Function
Differential decoder.y[0] = (x[0] - x[-1]) % M
gr. diff_decoder_bb(modulus)

1.8.27.93) framer_sink_1 ()
Type
Description

Usage
Parameters
Note
Example

Function
Given a stream of bits and access_code flags, assemble packets.
Input: stream of bytes from gr_correlate_access_code_bb, output: none. Pushes
assembled packet into target queue. The framer expects a fixed length header of 2 16-bit
shorts containing the payload length, followed by the payload. If the 2 16-bit shorts are
not identical, this packet is ignored. Better algs are welcome. The input data consists of
bytes that have two bits used. Bit 0, the LSB, contains the data bit. Bit 1 if set, indicates
that the corresponding bit is the the first bit of the packet. That is, this bit is the first one
after the access code.
gr. framer_sink_1(target_queue)
target_queue : pointer to message queue
Needs more documenation

1.8.27.94) map_bb ()
Type
Description
Usage
Parameters
Note
Example

Function
output[i] = map[input[i]]
gr. map_bb(map)
map : a vector of intgers
Needs more documenation

1.8.27.95) feval ()
Type
Description

Function
Base class for evaluating a function: void -> void
This class is designed to be subclassed in Python or C++ and is callable from both
places. It uses SWIG's "director" feature to implement the magic. It's slow. Don't use it in

Simple Gnuradio User Manual

Usage
Parameters
Sub Function 1
Note
Example

Page 124 of 208

a performance critical path. Override eval to define the behavior. Use calleval to invoke
eval (this kludge is required to allow a python specific "shim" to be inserted.
gr. feval()
ge.feval.calleval()
Needs more documenation

1.8.27.96) feval_xx ()
Type
Description

Usage
Parameters
Sub Function 1
Note
Example

Function
Base class for evaluating a function.This class is designed to be subclassed in Python or
C++ and is callable from both places. It uses SWIG's "director" feature to implement the
magic. It's slow. Don't use it in a performance critical path. Override eval to define the
behavior. Use calleval to invoke eval (this kludge is required to allow a python specific
"shim" to be inserted.
feval_cc : complex to complex
feval_dd : double to double
feval_ll : long to long
gr. feval_xx()
ge.feval_xx.calleval()
Needs more documenation

1.8.27.97) pwr_squelch_xx ()
Type
Description

Usage
Parameters

Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Note
Example

Function
Gate or zero output when input power below threshold.
pwr_squelch_cc : complex input, complex output
pwr_squelch_ff : float input, float output
gr. pwr_squelch_xx(db, alpha, ramp, gate)
db : threshold value
alpha: The gain value (float) of a moving average filter (Time Constant in sec)
ramp : integer represents rise/fail time im msec
gate : bool True or False
gr.pwr_squelch_xx.threshold() : Return threshold
gr.pwr_squelch_xx.set_threshold(db) : Set threshold
gr.pwr_squelch_xx.set_alpha(alpha) : Set alpha
gr.pwr_squelch_xx.ramp() : Return ramp
gr.pwr_squelch_xx.set_ramp(ramp) : Set ramp
gr.pwr_squelch_xx.gate() : Return bool True or False
gr.pwr_squelch_xx.set_gate(on) : Set threshold
gr.pwr_squelch_xx.unmuted() : Return bool True or False
Needs more documenation

1.8.27.98) squelch_base_xx ()
Type
Description

Function
??????????????????????????????
squelch_base_cc : complex input, complex output

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Usage
Parameters

Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Note
Example

Page 125 of 208

squelch_base_ff : float input, float output
gr. squelch_base_xx(name, ramp, gate)
name : ?????
ramp : integer represents rise/fail time im msec
gate : bool True or False
gr.squelch_ base_xx.squelch_range() : Return range
gr. squelch_ base_xx.ramp() : Return ramp
gr. squelch_ base_xx.set_ramp(ramp) : Set ramp
gr. squelch_ base_xx.gate() : Return bool True or False
gr. squelch_ base_xx.set_gate(on) : Set threshold
gr. squelch_ base_xx.unmuted() : Return bool True or False
Needs more documenation

1.8.27.99) ctcss_squelch_ff ()
Type
Description
Usage
Parameters

Sub Function 1
Sub Function 2
Sub Function 3
Sub Function 4
Sub Function 5
Sub Function 6
Sub Function 7
Sub Function 8
Sub Function 9
Note
Example

Function
Gate or zero output if ctcss tone not present
gr. ctcss_squelch_ff(rate, freq, level, len, ramp, gate)
rate : sampling rate
freq : tone frequency
level : tone level
ramp : integer represents rise/fail time im msec
gate : bool True or False
gr.ctcss_squelch_ff.level() : Return level
gr.ctcss_squelch_ff.set_level(level) : Set level
gr.ctcss_squelch_ff.len() : Return length
gr.ctcss_squelch_ff.squelch_range() : Return squelch range
gr.ctcss_squelch_ffr_amp() : Return ramp
gr.ctcss_squelch_ff.set_ramp(ramp) : Set ramp
gr.ctcss_squelch_ff.gate() : Return True or False
gr.ctcss_squelch_ff.set_gate(gate) : Set Gate
gr.ctcss_squelch_ff.unmuted() : Return True or False
Needs more documenation

1.8.27.100) feedforward_agc_cc ()
Type
Description
Usage
Parameters
Note
Example

Function
Non-causal AGC which computes required gain based on max absolute value over
nsamples.
gr. feedforward_agc_cc(nsamples, refrence)
nsamples : number of samples
refrence : refrence value

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1.8.27.101) bin_statistics_f ()
Type
Description
Usage
Parameters

Note
Example

Function
Sink block that controls frequency scanning and record frequency domain statistics.
gr. bin_statistics(vlen, msgq, tune, tune_delay, dwell_delay)
vlen : vector length (fft size)
msgq : pointer to msg queue
tune : python callback function (tune type is gr.feval_dd())
tune_delay : Time to delay (in number of samples) after changing frequency
dwell_delay : Time to dwell (in number of samples) at a given frequncy
Needs more documenation
See usrp_spectrum_sense.py

1.8.27.102) glfsr_source_x ()
Type
Description
Usage
Parameters

Sub Function 1
Sub Function 2
Note
Example

1.9)

gnuradio/ window.py

Type
Description
Examples
Note

1.9.1)

Function
glfsr_source_f : Galois LFSR pseudo-random source generating float outputs -1.0 - 1.0.
glfsr_source_b : Galois LFSR pseudo-random source generating 0 or 1.
gr. glfsr_source_x(degree, repeat, mask, seed)
degree :
repeat : bool True or False
mask :
seed :
gr. glfsr_source_x.period() : Return period
gr. glfsr_source_x.mask() : Return mask
Needs more documenation

Python file
Routines for designing window functions for FFT.

hamming()

Type
Description
Usage
Parameters
Examples
Note

Function
Design Hamming window
window.hamming(fft_size)
fft_size : number of window taps

Simple Gnuradio User Manual

1.9.2)

hanning()

Type
Description
Usage
Parameters
Examples
Note

1.9.3)

welch()

Type
Description
Usage
Parameters
Examples
Note

1.9.4)

Function
Design Parzen window
window.parzen(fft_size)
fft_size : number of window taps

bartlett()

Type
Description
Usage
Parameters
Examples
Note

1.9.6)

Function
Design Welch window
window.welch(fft_size)
fft_size : number of window taps

parzen()

Type
Description
Usage
Parameters
Examples
Note

1.9.5)

Function
Design Hanning window
window.hanning(fft_size)
fft_size : number of window taps

Function
Design Bartlett window
window.bartlett(fft_size)
fft_size : number of window taps

blackman2()

Type
Description
Usage
Parameters
Examples
Note

Function
Design Blackman2 window
window.blackman2(fft_size)
fft_size : number of window taps

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Simple Gnuradio User Manual

1.9.7)

blackman3()

Type
Description
Usage
Parameters
Examples
Note

1.9.8)

blackman4()

Type
Description
Usage
Parameters
Examples
Note

1.9.9)

Function
Design Blackman3 window
window.blackman3(fft_size)
fft_size : number of window taps

Function
Design Blackman4 window
window.blackman4(fft_size)
fft_size : number of window taps

exponential()

Type
Description
Usage
Parameters
Examples
Note

Function
Design Exponential window
window.exponential (fft_size)
fft_size : number of window taps

1.9.10) riemann()
Type
Description
Usage
Parameters
Examples
Note

Function
Design Riemann window
window.riemann (fft_size)
fft_size : number of window taps

1.9.11) blackmanharris ()
Type
Description
Usage
Parameters
Examples
Note

Function
Design Blackmanharris window
window.blackmanharris (fft_size)
fft_size : number of window taps

1.9.12) nuttall()
Type
Description
Usage
Parameters
Examples
Note

Function
Design Nuttall window
window.nuttal (fft_size)
fft_size : number of window taps

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1.9.13) kaiser()
Type
Description
Usage
Parameters
Examples
Note

1.10)

Function
Design Kaiser window
window.kaiser (fft_size)
fft_size : number of window taps

gnuradio/ video_sdl.py

Type
Description
Examples
Note

Python file
Simple Direct Media Layer (SDL) routines for displaying video.

1.10.1) video_sdl_sink_uc()
Type
Description

Usage
Parameters

Function
Video sink using SDL. Input signature is one, two or three streams of unsigned char. One
stream: stream is grey (Y) two streems: first is grey (Y), second is alternating U and V
Three streams: first is grey (Y), second is U, third is V Input samples must be in the
range [0,255].
video_sdl.video_sdl_sink_uc( framerate, width, height, format, dst_width,
dst_height)
framerate : double
width : integer
height : integer
format : unsigned integer
dst_width : integer
dst_height : integer

Examples
Note

1.10.2) video_sdl_sink_s()
Type
Description

Usage
Parameters

Examples
Note

Function
Video sink using SDL. Input signature is one, two or three streams of signed shorts. One
stream: stream is grey (Y) two streems: first is grey (Y), second is alternating U and V
Three streams: first is grey (Y), second is U, third is V Input samples must be in the
range [0,255].
video_sdl.video_sdl_sink_s( framerate, width, height, format, dst_width,
dst_height)
framerate : double
width : integer (640)
height : integer (480)
format : unsigned integer
dst_width : integer
dst_height : integer

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1.10.3) sink_uc()
Type
Description

Usage
Parameters

Function
Video sink using SDL. Input signature is one, two or three streams of unsigned char. One
stream: stream is grey (Y) two streems: first is grey (Y), second is alternating U and V
Three streams: first is grey (Y), second is U, third is V Input samples must be in the
range [0,255].
video_sdl.sink_uc( framerate, width, height, format, dst_width, dst_height)
framerate : double
width : integer
height : integer
format : unsigned integer
dst_width : integer
dst_height : integer

Examples
Note

1.10.4) sink_s()
Type
Description

Usage
Parameters

Function
Video sink using SDL. Input signature is one, two or three streams of signed shorts. One
stream: stream is grey (Y) two streems: first is grey (Y), second is alternating U and V
Three streams: first is grey (Y), second is U, third is V Input samples must be in the
range [0,255].
video_sdl. sink_s( framerate, width, height, format, dst_width, dst_height)
framerate : double
width : integer
height : integer
format : unsigned integer
dst_width : integer
dst_height : integer

Examples
Note

1.11)

gnuradio/ trellis.py

Type
Description
Examples
Note

Python file
Trellis coding ??????????????????

1.11.1) fsm()
Type
Description
Usage
Parameters
Examples
Note

Function
Finite state machine ????????????
trellis.fsm()

Needs more documentation

Simple Gnuradio User Manual

1.11.2) interleaver()
Type
Description
Usage
Parameters
Examples
Note

Function
??????????
trellis.interleaver()

Needs more documentation

1.11.3) trellis_permutation ()
Type
Description
Usage
Parameters
Examples
Note

Function
Permutation ?????????????
trellis.trellis_permutation()

Needs more documentation

1.11.4) trellis_siso_f ()
Type
Description
Usage
Parameters
Examples
Note

Function
???????????????
trellis.trellis_siso_f()

Needs more documentation

1.11.5) trellis_encoder_xx ()
Type
Description

Usage
Parameters
Examples
Note

Function
???????????????
trellis_encoder_bb
trellis_encoder_bi
trellis_encoder_bs
trellis_encoder_ii
trellis_encoder_si
trellis_encoder_ss
trellis_encoder_bb
trellis_encoder_bb

Needs more documentation

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1.11.6) trellis_metrics_x ()
Type
Description

Usage
Parameters
Examples
Note

Function
???????????????
trellis_metrics_c
trellis_metrics_f
trellis_metrics_i
trellis_metrics_s

Needs more documentation

1.11.7) trellis_viterbi_x ()
Type
Description

Usage
Parameters
Examples
Note

Function
???????????????
trellis_viterbi_b
trellis_viterbi_i
trellis_viterbi_s

Needs more documentation

1.11.8) trellis_viterbi_combined_xx ()
Type
Description

Usage
Parameters
Examples
Note

1.12)

Function
???????????????
trellis_viterbi_combined_cb
trellis_viterbi_combined_ci
trellis_viterbi_combined_cs
trellis_viterbi_combined_fb
trellis_viterbi_combined_fi
trellis_viterbi_combined_fs
trellis_viterbi_combined_ib
trellis_viterbi_combined_ii
trellis_viterbi_combined_is
trellis_viterbi_combined_sb
trellis_viterbi_combined_si
trellis_viterbi_combined_ss

Needs more documentation

gnuradio/ sounder.py

Type
Description

Python file
This is a work-in-progress implementation of a m-sequence based channel sounder for
GNU Radio and the USRP.
In typical use, the user would run the sounder as a transmitter on oneUSRP, and a
receiver on another at a different location. The receiver will determine the impulse
response of the RF channel in between.

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The sounder uses a custom FPGA bitstream that is able to generate and receive a
sounder waveform across a full 32 MHz wide swath of RF spectrum; the waveform
generation and impulse response processing occur in logic in the USRP FPGA and not
in the host PC. This avoids the USB throughput bottleneck entirely. Unfortunately, there
is still roll-off in the AD9862 digital up-converter interpolation filter that impacts the outer
20% of bandwidth, but this can be compensated for by measuring and subtracting
out this response during calibration.
The sounder is based on sending a maximal-length PN code modulated as BPSK with
the supplied center frequency, with a chip-rate of 32 MHz. The receiver correlates the
received signal across all phases of the PN code and outputs an impulse response
vector. As auto-correlation of an m-sequence is near zero for any relative phase shift,
the actual measured energy at a particular phase shift is related to the impulse response
for that time delay. This is the same principle used in spread-spectrum RAKE receivers
such as are used with GPS and CDMA.
The transmitter is designed to work only with the board in side A. The receiver may be in
side A or side B. The boards may be standalone LFTX/LFRXs or RFX daughterboards.
To use, the following script is installed into $prefix/bin:
Usage: usrp_sounder.py [options]
Options:
-h, --help
show this help message and exit
-R RX_SUBDEV_SPEC, --rx-subdev-spec=RX_SUBDEV_SPEC
select USRP Rx side A or B
-f FREQ, --frequency=FREQ
set frequency to FREQ in Hz, default is 0.0
-d DEGREE, --degree=DEGREE
set sounding sequence degree (2-12), default is 12,
-t, --transmit
enable sounding transmitter
-r, --receive
enable sounding receiver
-l, --loopback
enable digital loopback, default is disabled
-v, --verbose
enable verbose output, default is disabled
-D, --debug
enable debugging output, default is disabled
-F FILENAME, --filename=FILENAME
log received impulse responses to file
To use with an LFTX board, set the center frequency to 16M:
$ usrp_sounder.py -f 16M -t
The sounder receiver command line is:
$ usrp_sounder.py -f 16M -r -F output.dat
You can vary the m-sequence degree between 2 and 12, which will create sequence
lengths between 3 and 4095 (128 us). This will affect how frequently the receiver can
calculate impulse response vectors.
The correlator uses an O(N^2) algorithm, by using an entire PN period of the received
signal to correlate at each lag value. Thus, using a degree 12 PN code of length 4095, it
takes 4095*4095/32e6 seconds to calculate a single impulse response vector, about a
half a second. One can reduce this time by a factor of 4 for each decrement in PN code
degree, but this also reduces the inherent processing gain by 6 dB as well.
The impulse response vectors are written to a file in complex float format, and consist of
the actual impulse response with a noise floor dependent on the PN code degree in use.
There is a loopback test mode that causes the sounding waveform to be routed back to
the receiver inside the USRP:

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$ usrp_sounder.py -r -t -l -F output.dat
The resulting impulse response will be a spike followed by a near zero value for the rest
of the period.
Synchronization at the receiver is not yet implemented, so the actual impulse response
may be time shifted an arbitrary value within the the impulse response vector. If one
assumes the first to arrive signal is the strongest, then one can circularly rotate the
vector until the peak is at time zero.
Examples
Note

1.12.1) sounder_tx ()
Type
Description
Usage
Parameters
Examples
Note

Function
Sounder_tx function
sounder.sounder_tx (loopback=False, ampl=4096,verbose=False, debug=False)

Needs more documentation

1.12.2) sounder_rx ()
Type
Description
Usage
Parameters
Examples
Note

Function
Sounder_rx function
sounder.sounder_rx(subdev_spec=None,gain=None,length=1,alpha=1.0,msgq=Non
e,loopback=False,verbose=False,debug=False)

Needs more documentation

1.12.3) sounder ()
Type
Description
Usage

Parameters
Examples
Note

1.13)

Function
sounder.sounder(transmit=False,receive=False,loopback=False,rx_subdev_spec=N
one,ampl=0x1FFF,frequency=0.0,rx_gain=None,degree=12,length=1,alpha=1.0,msgq
=None,verbose=False,debug=False)

Needs more documentation

gnuradio/ radar_mono.py

Type
Description

Python file
This GNU Radio component implements a monostatic radar transmitter and receiver. It
uses a custom FPGA build to generate a linear FM chirp waveform directly in the USRP.
Echo returns are recorded to a file for offline analysis.
The LFM chirp can be up to 32 MHz in width, whose center frequency is set by which
transmit daughter board is installed. This gives a range resolution of approximately 5
meters.

Examples
Note

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1.13.1) radar_tx ()
Type
Description
Usage
Parameters
Examples
Note

Function
Transmitter object. Uses usrp_sink, but only for a handle to the FPGA registers.
radar_mono.radar_tx(options)

1.13.2) radar_rx ()
Type
Description
Usage
Parameters
Examples
Note

Function
Receiver object. Uses usrp_source_c to receive echo records.
radar_mono.radar_rx(options,callback)

1.13.3) radar ()
Type
Description
Usage
Parameters
Examples
Note

1.14)

gnuradio/ ra.py

Type
Description
Examples
Note

1.15)

Function
???????
radar_mono.radar(options,callback)

Python file
Radio astronomy. This file was automatically generated by SWIG
Needs more documentation

gnuradio/ packet_util.py

Type
Description
Examples
Note

Python file
Utilities for packet handling

1.15.1) conv_packed_binary_string_to_1_0_string ()
Type
Description

Function
'\xAF' --> '10101111'

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Usage
Parameters
Examples
Note

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packet_util.conv_packed_binary_string_to_1_0_string(s)
s: string

1.15.2) conv_1_0_string_to_packed_binary_string ()
Type
Description

Usage
Parameters
Examples
Note

Function
'10101111' -> ('\xAF', False)
Basically the inverse of conv_packed_binary_string_to_1_0_string, but also returns a
flag indicating if we had to pad with leading zeros to get to a multiple of 8.
packet_util. conv_1_0_string_to_packed_binary_string (s)
s: string

1.15.3) make_packet ()
Type
Description
Usage

Parameters

Function
Build a packet, given access code, payload, and whitener offset. Packet will have access
code at the beginning, followed by length, payload and finally CRC-32.
packet_util. make_packet(payload, samples_per_symbol, bits_per_symbol,
access_code=default_access_code, pad_for_usrp=True,
whitener_offset=0, whitening=True)
payload: Packet payload, len [0, 4096]
samples_per_symbol: samples per symbol (needed for padding calculation)
type samples_per_symbol: int
bits_per_symbol:
(needed for padding calculation)
type bits_per_symbol:
int
access_code:
string of ascii 0's and 1's
pad_for_usrp: If true, packets are padded such that they end up a multiple of 128
samples
whitener_offset :
offset into whitener string to use [0-16)
whitening:
Turn whitener on or off
type whitening:
bool

Examples
Note

1.15.4) unmake_packet ()
Type
Description
Usage
Parameters

Examples
Note

Function
Return (ok, payload)
packet_util. unmake_packet(whitened_payload_with_crc, whitener_offset=0,
dewhitening=True)
whitened_payload_with_crc: string
whitener_offset: offset into whitener string to use [0-16)
dewhitening: Turn whitener on or off
type dewhitening: bool

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1.15.5) _npadding_bytes ()
Type
Description

Usage
Parameters

Function
Generate sufficient padding such that each packet ultimately ends up being a multiple of
512 bytes when sent across the USB. We send 4-byte samples across the USB (16-bit I
and 16-bit Q), thus we want to pad so that after modulation the resulting packet is a
multiple of 128 samples.
Returns number of bytes of padding to append.
packet_util. _npadding_bytes(pkt_byte_len, samples_per_symbol,
bits_per_symbol)
ptk_byte_len: len in bytes of packet, not including padding.
samples_per_symbol: samples per bit (1 bit / symbolwidth GMSK)
type samples_per_symbol: int
bits_per_symbol: bits per symbol (log2(modulation order))
type bits_per_symbol: int

Examples
Note

1.16)

gnuradio/ optfir.py

Type
Description

Python file
Routines for designing optimal FIR filters. For a great intro to how all this stuff works, see
section 6.6 of "Digital Signal Processing: A Practical Approach", Emmanuael C. Ifeachor
and Barrie W. Jervis, Adison-Wesley, 1993. ISBN 0-201-54413-X.

Examples
Note

1.16.1) low_pass ()
Type
Description
Usage
Parameters
Examples
Note

Function
Low pass filter design.
optfir.low_pass (gain, Fs, freq1, freq2, passband_ripple_db, stopband_atten_db,
nextra_taps=0)
See ayfabtu.py
Needs more documentation

1.16.2) high_pass ()
Type
Description
Usage
Parameters
Examples
Note

Function
High pass filter design.
optfir.high_pass (Fs, freq1, freq2, stopband_atten_db, passband_ripple_db,
nextra_taps=0)

1) FIXME : The high_pass is broken
2) Needs more documentation

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1.17)

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gnuradio/ ofdm_packet_util.py

Type
Description
Examples
Note

Python file
Utilities for OFDM packet handling

1.17.1) conv_packed_binary_string_to_1_0_string ()
Type
Description
Usage
Parameters
Examples
Note

Function
'\xAF' --> '10101111'
ofdm_packet_util.conv_packed_binary_string_to_1_0_string(s)
s: string

1.17.2) conv_1_0_string_to_packed_binary_string ()
Type
Description

Usage
Parameters
Examples
Note

Function
'10101111' -> ('\xAF', False)
Basically the inverse of conv_packed_binary_string_to_1_0_string, but also returns a
flag indicating if we had to pad with leading zeros to get to a multiple of 8.
ofdm_packet_util. conv_1_0_string_to_packed_binary_string (s)
s: string

1.17.3) make_packet ()
Type
Description
Usage
Parameters

Function
Build a packet, given access code, payload, and whitener offset. Packet will have access
code at the beginning, followed by length, payload and finally CRC-32.
ofdm_packet_util. make_packet(payload, samples_per_symbol, bits_per_symbol,
pad_for_usrp=True, whitener_offset=0, whitening=True)
payload: packet payload, len [0, 4096]
samples_per_symbol: samples per symbol (needed for padding calculation)
type samples_per_symbol: int
bits_per_symbol:
(needed for padding calculation)
type bits_per_symbol:
int
whitener_offset : offset into whitener string to use [0-16)
pad_for_usrp: If true, packets are padded such that they end up a multiple of 128
samples
whitening: Turn whitener on or off
type whitening: bool

Examples
Note

1.17.4) unmake_packet ()
Type
Description
Usage

Function
Return (ok, payload)
ofdm_packet_util. unmake_packet(whitened_payload_with_crc, whitener_offset=0,
dewhitening=True)

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Parameters

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whitened_payload_with_crc: string
whitener_offset : offset into whitener string to use [0-16)
dewhitening: Turn whitener on or off
type dewhitening: bool

Examples
Note

1.17.5) _npadding_bytes ()
Type
Description

Usage
Parameters

Function
Generate sufficient padding such that each packet ultimately ends up being a multiple of
512 bytes when sent across the USB. We send 4-byte samples across the USB (16-bit I
and 16-bit Q), thus we want to pad so that after modulation the resulting packet is a
multiple of 128 samples.
Returns number of bytes of padding to append.
ofdm_packet_util. _npadding_bytes(pkt_byte_len, samples_per_symbol,
bits_per_symbol)
ptk_byte_len: len in bytes of packet, not including padding.
samples_per_symbol: samples per bit (1 bit / symbolwidth GMSK)
type samples_per_symbol: int
bits_per_symbol: bits per symbol (log2(modulation order))
type bits_per_symbol: int

Examples
Note

1.18)

gnuradio/ modulation_utils.py

Type
Description

Python file
Miscellaneous utilities for managing modulations and demodulations, as well as other
items useful in dealing with generalized handling of different modulations and demods.

Examples
Note

1.18.1) type_1_mods ()
Type
Description
Usage
Parameters
Examples
Note

Function
Type 1 modulators accept a stream of bytes on their input and produce complex
baseband output
modulation_utils.type_1_mods()
See tunnel.py
Needs more documentation

1.18.2) type_1_demods ()
Type
Description

Usage

Function
Type 1 demodulators accept complex baseband input and produce a stream of bits,
packed1 bit / byte as their output. Their output is completely unambiguous. There is no
Needsto resolve phase or polarity ambiguities.
modulation_utils.type_1_demods()

Simple Gnuradio User Manual

Parameters
Examples
Note

1.19)

Examples
Note

NO LONGER USED

Python file
Add support for unit testing

gnuradio/eng_option.py

Type
Description
Examples
Note

1.22)

Python file
Simple class for allowing local definition of a calibration function for raw samples coming
from the RA detector chain. Each observatory is different, and rather than hacking up
the main code in usrp_ra_receiver we define the appropriate function here. For example,
one could calibrate the output in Janskys, rather than dB.

gnuradio/gr_unittest.py

Type
Description
Examples
Note

1.21)

See tunnel.py
Needs more documentation

gnuradio/ local_calibrator.py

Type
Description

1.20)

Page 140 of 208

Python file
Add support for engineering notation to optparse.OptionParser

gnuradio/eng_notation.py

Type
Description
Examples
Note

Python file
Change engineering notation (example 5e-9 <==> 5n )

1.22.1) num_to_str ()
Type
Description
Usage
Parameters
Examples
Note

Function
Convert a number to a string in engineering notation. E.g., 5e-9 -> 5n
eng_notation.num_to_str(n)

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1.22.2) str_to_num ()
Type
Description
Usage
Parameters
Examples
Note

1.23)

Function
Convert a string in engineering notation to a number. E.g., '15m' -> 15e-3
eng_notation.str_to_num(value)

gnuradio/audio_oss.py

Type
Description

Python file
Open Sound System (oss) sound interface for audio sink and source.This file was
automatically generated by SWIG

Examples
Note

1.24)

gnuradio/audio_alsa.py

Type
Description

Python file
Advanced Linux Sound Architecture (ALSA) sound interface for audio sink and
source.This file was automatically generated by SWIG

Examples
Note

1.25)

gnuradio/audio.py

Type
Description

Python file
This is the 'generic' audio or soundcard interface. known_modules = ( 'audio_alsa',
'audio_oss', 'audio_osx', 'audio_jack', 'audio_portaudio'). The behavior of this module is
controlled by the [audio] audio_module configuration parameter. If it is 'auto' we attempt
to import modules from the known_modules list, using the first one imported
successfully. If [audio] audio_module is not 'auto', we assume it's the name of an audio
module and attempt to import it.

Examples
Note

1.25.1) source ()
Type
Description
Usage
Parameters

Examples
Note

Function
Audio source. Output signature is one or two streams of floats. Output samples will be in
the range [-1,1].
audio.source(sampling_rate, device_name=””, ok_to_block=true)
sampling_rate : integer
device_name : string
ok_to_block : bool

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1.25.2) sink ()
Type
Description
Usage
Parameters

Examples
Note

1.26)

gnuradio/atsc.py

Type
Description
Examples
Note

1.27)

Function
Audio sink. Input signature is one or two streams of floats. Input samples must be in the
range [-1, 1].
audio.sink(sampling_rate, device_name=””, ok_to_block=true)
sampling_rate : integer
device_name : string
ok_to_block : bool
sink = audio.sink(sample_rate, "plughw:0,0")

Python file
Support for ATSC signal handling. This file was automatically generated by SWIG.
Needs more documentation

gnuradio/usrp.py

Type
Description
Examples
Note

Python file
Configuration interface for the USRP

1.27.1) source_x()
Type
Description

Usage

Function
interface to Universal Software Radio Peripheral Rx path
source_c() : complex data source
source_s() : short interleaved data source
usrp.source_x(which=0, decim_rate=64, nchan=1, mux=0x32103210, mode=0,
fusb_block_size=0, fusb_nblocks=0,
fpga_filename="", firmware_filename="")

Parameters
Examples
Note

1.27.1.1)
Type
Description

Usage
Parameters

tune()
Sub Function
Set the center frequency we're interested in.
Tuning is a two step process. First we ask the front-end to tune as close to the desired
frequency as it can. Then we use the result of that operation and our target_frequency to
determine the value for the digital down converter.
Returns False if failure else tune_result
usrp.source_x.tune(u, chan, subdev, target_freq)
u: instance of usrp.source_*
chan: DDC number

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type chan: int
subdev: daughterboard subdevice
target_freq: frequency in Hz
Examples
Note

1.27.1.2)

has_rx_halfband()

Type
Description

Sub Function
To check if the FPGA implement a final Rx half-band filter? If it doesn't, the maximum
decimation factor with proper gain is 1/2 of what it would otherwise be.
usrp.source_x.has_rx_halfband()

Usage
Parameters
Examples
Note

1.27.1.3)

nddcs()

Type
Description
Usage
Parameters
Examples
Note

Sub Function
Return number of Digital Down Converters implemented in FPGA, this will be 0, 1, 2, or
4.
usrp.source_x.nddcs()

1.27.2) sink_x()
Type
Description

Usage

Function
Interface to Universal Software Radio Peripheral Tx path
sink_c() : complex data source
sink _s() : short interleaved data source
usrp.sink _x(which=0, interp_rate=128, nchan=1, mux=0x98,
fusb_block_size=0, fusb_nblocks=0,
fpga_filename="", firmware_filename="")

Parameters
Examples
Note

1.27.2.1) tune()
Type
Description

Usage
Parameters

Sub Function
Set the center frequency we're interested in. Tuning is a two step process. First we ask
the front-end to tune as close to the desired frequency as it can. Then we use the result
of that operation and our target_frequency to determine the value for the digital down
converter.
Returns False if failure else tune_result
usrp.sink_x.tune(u, chan, subdev, target_freq)
u: instance of usrp.sink_*
chan: DUC number

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type chan: int
subdev: daughterboard subdevice
target_freq: frequency in Hz
Examples
Note

Needs more documentation

1.27.2.2) has_tx_halfband()
Type
Description
Usage
Parameters
Examples
Note

Sub Function
To check if the FPGA implement a final Tx half-band filter?
usrp.sink_x.has_tx_halfband()

1.27.2.3) nducs()
Type
Description
Usage
Parameters
Examples
Note

Sub Function
Return number of Digital up Converters implemented in FPGA, this will be 0,1,or 2,.
usrp.sink_x.nducs()

1.27.3) determine_rx_mux_value ()
Type
Description

Usage
Parameters

Examples
Note

Function
A utility to determine appropriate Rx mux value as a function of the subdevice choosen
and thecharacteristics of the respective daughterboard.
Returns:
the Rx mux value
Figure out which A/D's to connect to the DDC. Each daughterboard consists of 1 or 2
subdevices. (At this time, all but the Basic Rx have a single subdevice. The Basic Rx
has two independent channels, treated as separate subdevices). subdevice 0 of a
daughterboard may use 1 or 2 A/D's. We determine this by checking the is_quadrature()
method. If subdevice 0 uses only a single A/D, it's possible that the daughterboard has a
second subdevice, subdevice 1, and it uses the second A/D. If the card uses only a
single A/D, we wire a zero into the DDC Q input.
(side, 0) says connect only the A/D's used by subdevice 0 to the DDC.
(side, 1) says connect only the A/D's used by subdevice 1 to the DDC.
usrp.determine_rx_mux_value(u, subdev_spec)
u: Instance of USRP source
subdev_spec: Tuple represent (side, subdev).
type subdev_spec: (side, subdev), where side is 0 or 1 and subdev is 0 or 1

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1.27.4) tune_result ()
Type
Description
Usage

Function
Container for intermediate tuning information. Return tunning informations
tune_result.baseband_freq : Return the resultant baseband frequency
tune_result .dxc_freq : Return the used DDC or DUC frequency
tune_result.residual_freq : Return the residual frequency after tunning
tune_result .inverted : Return True if the spectrum is inverted, otherwise return False

Parameters
Examples
Note

1.27.5) determine_tx_mux_value ()
Type
Description

Usage
Parameters

Function
A utility to determine the appropriate Tx mux value as a function of the subdevice
choosen.
Returns: The Tx mux value
This is simpler than the rx case. Either you want to talk to side A or side B. If you want
to talk to both sides at once, determine the value manually.
usrp.determine_tx_mux_value(u, subdev_spec):
u:
instance of USRP sink
subdev_spec: Tuple represent (side, subdev). .
type subdev_spec: (side, subdev), where side is 0 or 1 and subdev is 0

Examples
Note

1.27.6) selected_subdev ()
Type
Description
Usage
Parameters

Function
A utility to return the user specified daughterboard subdevice.
Returns: An instance derived from db_base.
usrp.selected_subdev (u, subdev_spec)
u: Instance of USRP sink or source
subdev_spec: Tuple represent (side, subdev)
type subdev_spec: (side, subdev), where side is 0 or 1 and subdev is 0 or 1

Examples
Note

1.27.7) calc_dxc_freq ()
Type
Description

Usage

Function
A utility to calculate the frequency to be used for setting the digital up or down converter.
Return: 2-tuple (ddc_freq, inverted) where ddc_freq is the value for the ddc and inverted
is True if we're operating in an inverted Nyquist zone
usrp.calc_dxc_freq(target_freq, baseband_freq, fs)

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Parameters

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target_freq: desired RF frequency (Hz)
type target_freq: number
baseband_freq: The RF frequency that corresponds to DC in the IF.
type baseband_freq: number
fs: converter sample rate
type fs: number

Examples
Note

1.27.8) pick_rx_subdevice()
Type
Description

Usage
Parameters
Examples
Note

Function
If the user didn't specify an rx subdevice on the command line, try for one of these, in
order: FLEX_400, FLEX_900, FLEX_1200, FLEX_1800, FLEX_2400, TV_RX, DBS_RX,
and BASIC_RX, whatever's on side A.
Return a subdev_spec
usrp.pick_rx_subdevice(u)
u: Instance of USRP source

1.27.9) pick_tx_subdevice()
Type
Description

Usage
Parameters
Examples
Note

1.27.10)
Type
Description
Usage
Parameters

Function
If the user didn't specify a tx subdevice on the command line, try for one of these, in
order: FLEX_400, FLEX_900, FLEX_1200, FLEX_1800, FLEX_2400, BASIC_TX,
whatever's on side A.
Return a subdev_spec
usrp.pick_rx_subdevice(u)
u: Instance of USRP source

pick_ subdev()
Function
Pick whatever in side A
Return: subdev specification
usrp.pick_subdev(u, candidates)
u:
usrp instance sink or source
candidates: list of usrp dbids which are :
usrp_dbid.BASIC_TX
= 0x0000
usrp_dbid.BASIC_RX
= 0x0001
usrp_dbid.DBS_RX
= 0x0002
usrp_dbid.TV_RX
= 0x0003
usrp_dbid.FLEX_400_RX
= 0x0004
usrp_dbid.FLEX_900_RX
= 0x0005
usrp_dbid.FLEX_1200_RX = 0x0006
usrp_dbid.FLEX_2400_RX = 0x0007
usrp_dbid.FLEX_400_TX
= 0x0008
usrp_dbid.FLEX_900_TX
= 0x0009
usrp_dbid.FLEX_1200_TX = 0x000a
usrp_dbid.FLEX_2400_TX = 0x000b
usrp_dbid.TV_RX_REV_2
= 0x000c
usrp_dbid.DBS_RX_REV_2_1 = 0x000d

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usrp_dbid.LF_TX
= 0x000e
usrp_dbid.LF_RX
= 0x000f
usrp_dbid.FLEX_400_RX_MIMO_A = 0x0014
usrp_dbid.FLEX_900_RX_MIMO_A = 0x0015
usrp_dbid.FLEX_1200_RX_MIMO_A = 0x0016
usrp_dbid.FLEX_2400_RX_MIMO_A = 0x0017
usrp_dbid.FLEX_400_TX_MIMO_A = 0x0018
usrp_dbid.FLEX_900_TX_MIMO_A = 0x0019
usrp_dbid.FLEX_1200_TX_MIMO_A = 0x001a
usrp_dbid.FLEX_2400_TX_MIMO_A = 0x001b
usrp_dbid.FLEX_400_RX_MIMO_B = 0x0024
usrp_dbid.FLEX_900_RX_MIMO_B = 0x0025
usrp_dbid.FLEX_1200_RX_MIMO_B = 0x0026
usrp_dbid.FLEX_2400_RX_MIMO_B = 0x0027
usrp_dbid.FLEX_400_TX_MIMO_B = 0x0028
usrp_dbid.FLEX_900_TX_MIMO_B = 0x0029
usrp_dbid.FLEX_1200_TX_MIMO_B = 0x002a
usrp_dbid.FLEX_2400_TX_MIMO_B = 0x002b
usrp_dbid.FLEX_1800_RX = 0x0030
usrp_dbid.FLEX_1800_TX = 0x0031
usrp_dbid.FLEX_1800_RX_MIMO_A = 0x0032
usrp_dbid.FLEX_1800_TX_MIMO_A = 0x0033
usrp_dbid.FLEX_1800_RX_MIMO_B = 0x0034
usrp_dbid.FLEX_1800_TX_MIMO_B = 0x0035
usrp_dbid.TV_RX_REV_3
= 0x0040
usrp_dbid.WBX_LO_TX
= 0x0050
usrp_dbid.WBX_LO_RX
= 0x0051
Examples
Note

1.28)

gnuradio/usrp1.py

Type
Description
Examples
Note

Python file
Configuration interface for the USRP Rev 1 and later

1.28.1) source_x()
Type
Description

Usage

Function
Interface to Universal Software Radio Peripheral Rx path
source_c() : complex data source
source_s() : short interleaved data source
usrp.source_x(which=0, decim_rate=64, nchan=1, mux=0x32103210, mode=0,
fusb_block_size=0, fusb_nblocks=0,
fpga_filename="", firmware_filename="")

Parameters
Examples
Note

1.28.1.1) set_decim_rate()
Type
Description

Sub Function
Set decimator rate. Rate must be EVEN and in [8, 256]. The final complex sample rate
across the USB is adc_freq () / decim_rate () *nchannels()

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Usage
Parameters
Examples
Note

Page 148 of 208

usrp.source_x.set_decim_rate(rate)
rate : unsigned integer represents the decimation rate

1.28.1.2) set_nchannels()
Type
Description
Usage
Parameters
Examples
Note

Sub Function
Set number of active ddc channels. Nchannels must be 1, 2, 3 or 4.
usrp.source_x.set_nchannels(nchan)
nchan : integer

1.28.1.3) set_mux()
Type
Description

Sub Function
This determines which ADC (or constant zero) is connected to each DDC input. There
are 4 DDCs. Each has two inputs.
Mux value:
3
2
1
10987654321098765432109876543210
+-------+-------+-------+-------+-------+-------+-------+-------+
| Q3 | I3 | Q2 | I2 | Q1 | I1 | Q0 | I0 |
+-------+-------+-------+-------+-------+-------+-------+-------+

Usage
Parameters
Examples
Note

Each 4-bit I field is either 0,1,2,3
Each 4-bit Q field is either 0,1,2,3 or 0xf (input is const zero)
All Q's must be 0xf or none of them may be 0xf
usrp.source_x.set_mux(mux)
mux : integer
To specify an integer value using hex format using gru.hexint() function

1.28.1.4) set_rx_freq()
Type
Description

Usage
Parameters

Sub Function
Set the center frequency of the digital down converter. Channel must be in the range
[0,3]. freq is the center frequency in Hz. freq may be either negative or postive. The
frequency specified is quantized. Use rx_freq to retrieve the actual value used.
usrp.source_x.set_rx_freq(channel,freq)
channel: which ddc channel [0, 3]
freq : double, the frequency

Examples
Note

1.28.1.5) set_ddc_phase()
Type
Description
Usage
Parameters

Sub Function
Set the digital down converter phase register.
usrp.source_x.set_ddc_phase(channel,phase)
channel: which ddc channel [0, 3]
phase : 32-bit integer phase value.

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Examples
Note

1.28.1.6) set_fpga_mode()
Type
Description
Usage
Parameters

Sub Function
Set fpga special modes
usrp.source_x.set_fpga_mode(mode)
mode : one of
FPGA_MODE_NORMAL , FPGA_MODE_LOOPBACK, FPGA_MODE_COUNTING,
FPGA_MODE_COUNTING_32BIT

Examples
Note

1.28.1.7) set_verbose()
Type
Description
Usage
Parameters
Examples
Note

Sub Function
Print usrp configuration
usrp.source_x.set_verbose(verbose)
verbose : bool true or false

1.28.1.8) set_pga()
Type
Description

Sub Function
Set A/D Programmable Gain Amplifier (PGA). Gain is rounded to closest setting
supported by hardware.
Return true if sucessful
usrp.source_x.set_pga(which, gain_in_db)
which : which A/D [0,3]
gain_in_db : double gain value (linear in dB) in range [0.0,20.0]

Usage
Parameters
Examples
Note

1.28.1.9) pga()
Type
Description
Usage
Parameters
Examples
Note

1.28.1.10)
Type
Description

Sub Function
Return programmable gain amplifier gain setting in dB.
usrp.source_x.pga (which)
which : which A/D [0,3]

pga_min()
Sub Function
Return minimum legal PGA setting in dB.

Simple Gnuradio User Manual

Usage
Parameters
Examples
Note

1.28.1.11)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.12)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.13)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.14)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.15)
Type
Description
Usage
Parameters
Examples

usrp.source_x.pga_min()

pga_max()
Sub Function
Return maximum legal PGA setting in dB.
usrp.source_x.pga_max()

pga_db_per_step()
Sub Function
Return hardware step size of PGA (linear in dB).
usrp.source_x.pga_db_per_step()

fpga_master_clock_freq()
Sub Function
Return fpga master clock frequency
usrp.source_x.fpga_master_clock_freq()

converter_rate()
Sub Function
Return A/D converter rate
usrp.source_x.converter_rate()

decim_rate()
Sub Function
Return decimation rate
usrp.source_x.decim_rate()

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Note

1.28.1.16)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.17)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.18)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.19)
Type
Description

Usage
Parameters
Examples
Note

1.28.1.20)
Type
Description
Usage
Parameters

nchannels()
Sub Function
Return number of active ddc channels
usrp.source_x.nchannels()

mux()
Sub Function
Return mux setting
usrp.source_x.mux()

rx_freq()
Sub Function
Return channels ddc frequency
usrp.source_x.rx_freq(channel)
channel : which ddc channel [0,3]

daughterboard_id()
Sub Function
Return daughterboard ID for given Rx daughterboard slot. Slot A =0, Slot B=1.
daughterboard id >= 0 if successful
-1 if no daugherboard
-2 if invalid EEPROM on daughterboard
usrp.source_x.daughterboard_id(which_dboardl)
which_dboard : Which slot o or 1

write_aux_dac()
Sub Function
Write auxiliary digital to analog converter.
usrp.source_x. write_aux_dac ( which_dboard, which_dac, value )
which_dboard: [0,1] which slot , SLOT_TX_A and SLOT_RX_A share the same AUX

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DAC's. SLOT_TX_B and SLOT_RX_B share the same AUX DAC's.
which_dac: [2,3] TX slots must use only 2 and 3.
value : in range of [0,4095]
Examples
Note

1.28.1.21)
Type
Description
Usage
Parameters

read_aux_dac()
Sub Function
Read auxiliary analog to digital converter.
Return value in the range [0, 4095] if successful, else READ_FAILED.
usrp.source_x. read_aux_dac ( which_dboard, which_adc )
which_dboard : [0,1] which slot
which_adc : [0,1]

Examples
Note

1.28.1.22)
Type
Description
Usage
Parameters

write_eeprom()
Sub Function
Write EEPROM on motherboard or any daughterboard.
Return true if successful
usrp.source_x. write_eeprom(i2c_addr, eeprom_offset, buf)
i2c_addr : I2C bus address of EEPROM
eeprom_offset : byte offset in EEPROM to begin writing
buf : the data to write

Examples
Note

1.28.1.23)
Type
Description
Usage
Parameters

read_eeprom()
Sub Function
Read bytes from EEPROM on motherboard or any daughterboard.
Return the data read if successful, else a zero length string.
usrp.source_x. read_eeprom(i2c_addr, eeprom_offset, len)
i2c_addr : I2C bus address of EEPROM
eeprom_offset : byte offset in EEPROM to begin reading
buf : number of bytes to read

Examples
Note

1.28.1.24)
Type
Description
Usage
Parameters

write_i2c()
Sub Function
Write to I2C peripheral. Writes are limited to a maximum of of 64 bytes.
Return true ff successful.
usrp.source_x. write_i2c(i2c_addr, buf)
i2c_addr : I2C bus address (7-bits)
buf : The data to write

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Examples
Note

1.28.1.25)
Type
Description
Usage
Parameters

read_i2c()
Sub Function
Read from I2C peripheral. Reads are limited to a maximum of of 64 bytes.
Return the data read if successful, else a zero length string.
usrp.source_x.read_i2c(i2c_addr, len)
i2c_addr : I2C bus address (7-bits)
len : number of bytes to read

Examples
Note

1.28.1.26)
Type
Description
Usage
Parameters

set_adc_offset()
Sub Function
Set ADC offset correction.
usrp.source_x.set_adc_offset(which, offset)
which : which ADC[0,3]:
offset: 16-bit value to subtract from raw ADC input.

Examples
Note

1.28.1.27)
Type
Description
Usage
Parameters

set_dac_offset()
Sub Function
Set DAC offset correction.
usrp.source_x.set_dac_offset(which, offset, offset_pin)
which : which DAC[0,3]
offset: 10-bit offset value (ambiguous format: See AD9862 datasheet).
offset_pin: 1-bit value. If 0 offset applied to -ve differential pin; If 1 offset applied to +ve
differential pin.

Examples
Note

1.28.1.28)
Type
Description
Usage
Parameters

Examples
Note

set_adc_buffer_bypass()
Sub Function
Control ADC input buffer.
usrp.source_x.set_adc_buffer_bypass(which, bypass)
which : which ADC [0,3]
bypass : if non-zero, bypass input buffer and connect input directly to switched cap SHA
input of RxPGA.

Simple Gnuradio User Manual

1.28.1.29)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.30)
Type
Description

Usage
Parameters

serial_number()
Sub Function
Return the usrp's serial number. Return non-zero length string iff successful.
usrp.source_x.serial_number()

_write_oe()
Sub Function
Write direction register (output enables) for pins that go to daughterboard. Each d'board
has 16-bits of general purpose i/o. Setting the bit makes it an output from the FPGA to
the d'board.This register is initialized based on a value stored in the d'board EEPROM. In
general, you shouldn't be using this routine without a very good reason. Using this
method incorrectly will kill your USRP motherboard and/or daughterboard.
usrp.source_x._write_oe(which_dboard, value, mask)
which_dboard : [0,1] which d'board
value : value to write into register
mask : which bits of value to write into reg

Examples
Note

1.28.1.31)
Type
Description
Usage
Parameters

write_io()
Sub Function
Write daughterboard i/o pin value.
usrp.source_x.write_io(which_dboard, value, mask)
which_dboard : [0,1] which d'board
value : value to write into register
mask : which bits of value to write into reg

Examples
Note

1.28.1.32)
Type
Description
Usage
Parameters
Examples
Note

Page 154 of 208

read_io()
Sub Function
Read daughterboard i/o pin value.
Return register value if successful, else READ_FAILED
usrp.source_x.read_io(which_dboard)
which_dboard : [0,1] which d'board

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1.28.1.33)
Type
Description

Usage
Parameters

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set_dc_offset_cl_enable()
Sub Function
Enable/disable automatic DC offset removal control loop in FPGA. If the corresponding
bit is set, enable the automatic DC offset correction control loop. The 4 low bits are
significant:
ADC0 = (1 << 0)
ADC1 = (1 << 1)
ADC2 = (1 << 2)
ADC3 = (1 << 3)
By default the control loop is enabled on all ADC's.
usrp.source_x.set_dc_offset_cl_enable(bits, mask)
bits : which control loops to enable
mask : which bits to pay attention to

Examples
Note

1.28.1.34)
Type
Description

Usage
Parameters
Examples
Note

1.28.1.35)
Type
Description
Usage
Parameters

Examples
Note

1.28.1.36)

set_format()
Sub Function
Specify Rx data format. Rx data format control register
3 2 1 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 +----------------------------------------+-+-+---------+-------+ | Reserved (Must be zero) |B|Q| WIDTH | SHIFT | +----------------------------------------+-+-+---------+-------+
SHIFT specifies arithmetic right shift [0, 15] WIDTH specifies bit-width of I & Q samples
across the USB [1, 16] (not all valid) Q if set deliver both I & Q, else just I B if set bypass
half-band filter.
Right now the acceptable values are:
B Q WIDTH SHIFT 0 1 16 0 0 1 8 8
More valid combos to come.
Default value is 0x00000300 16-bits, 0 shift, deliver both I & Q.
usrp.source_x.set_format( format)
format : unsigned integer format specifier
See usrp_fft.py

make_format()
Sub Function
Make data format.
usrp.source_x.makeformat(width=16, shift=0, want_q=true,bypass_halfband=false)
width : integer
shift : integer
want_q : bool true or false, Do you want data Q channel or only the I Channel?.
bypass_halfband : bool true or false
See usrp_fft.py

format()

Simple Gnuradio User Manual

Type
Description
Usage
Parameters
Examples
Note

1.28.1.37)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.38)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.39)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.40)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.41)
Type
Description
Usage
Parameters

Sub Function
Return current data format.
usrp.source_x.format()

format_width()
Sub Function
Retuen format data width
usrp.source_x.format_width(format)

format_shift()
Sub Function
Return format data shift
usrp.source_x.format_shift(format)

format_want_q()
Sub Function
Return format want_q. Do you want Q samples?!
usrp.source_x.format_want_q(format)

format_bypass_halfband()
Sub Function
Retuen format bypass halfband filter
usrp.source_x.format_bypass_halfband(format)

_write_fpga_reg()
Sub Function
Write FPGA register.
Return True if successful
usrp.source_x._write_fpga_reg(regno,value)
regno : 7-bit register number

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value : 32-bit value
Examples
Note

1.28.1.42)
Type
Description
Usage
Parameters

_write_fpga_reg_masked()
Sub Function
Write FPGA register masked.
Return True if successful
usrp.source_x._write_fpga_reg_masked(regno, value, mask)
regno : 7-bit register number
value : 16-bit value
mask : 16 bit mask

Examples
Note

1.28.1.43)
Type
Description
Usage
Parameters
Examples
Note

1.28.1.44)
Type
Description
Usage
Parameters

_read_fpga_reg()
Sub Function
Read FPGA registers.
Return register value if successful, else READ_FAILED
usrp.source_x._read_fpga_reg(regno)
regno : 7-bit register number
READ_FAILED = -99999

_write_9862()
Sub Function
Write AD9862 register.
Return true if successful
usrp.source_x._write_9862(which_codec, regno, value)
which_codec : 0 or 1
regno : 6-bit register number
value : 8-bit value

Examples
Note

1.28.1.45)
Type
Description
Usage
Parameters

_read_9862()
Sub Function
Read AD9862 registers.
Return register value if successful, else READ_FAILED
usrp.source_x._read_9862(which_codec, regno)
which_codec : 0 or 1

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regno : 6-bit register number
Examples
Note

1.28.1.46)

_write_spi()

Type
Description

Sub Function
Write data to SPI bus peripheral.
SPI == "Serial Port Interface". SPI is a 3 wire bus plus a separate enable for each
peripheral. The common lines are SCLK,SDI and SDO. The FX2 always drives SCLK
and SDI, the clock and data lines from the FX2 to the peripheral. When enabled, a
peripheral may drive SDO, the data line from the peripheral to the FX2.
The SPI_READ and SPI_WRITE commands are formatted identically.
Each specifies which peripherals to enable, whether the bits should be transmistted Most
Significant Bit first or Least Significant Bit first, the number of bytes in the optional
header, and the number of bytes to read or write in the body.
The body is limited to 64 bytes. The optional header may contain 0, 1 or 2 bytes. For an
SPI_WRITE, the header bytes are transmitted to the peripheral followed by the the body
bytes. For an SPI_READ, the header bytes are transmitted to the peripheral, then len
bytes are read back from the peripheral.(see : usrp_spi_defs.h file). If format specifies
that optional_header bytes are present, they are written to the peripheral immediately
prior to writing buf.
Return true if successful. Writes are limited to a maximum of 64 bytes.
usrp.source_x._write_spi(optional_header, enables, format, buf)
optional_header: 0,1 or 2 bytes to write before buf.
enables: bitmask of peripherals to write.
format: transaction format. SPI_FMT_*
buf : the data to write

Usage
Parameters

Examples
Note

1.28.1.47)

_read_spi()

Type
Description
Usage
Parameters

Sub Function
Read data from SPI bus peripheral.
Return the data read if successful, else a zero length string.
usrp.source_x._read_spi(optional_header, enables, format, len)
optional_header : 0,1 or 2 bytes to write before buf.
enables : bitmask of peripherals to write.
format : transaction format. SPI_FMT_*
len : number of bytes to read.

Examples
Note

1.28.2) sink_x()
Type
Description

Function
interface to Universal Software Radio Peripheral Rx path
sink_c() : complex data source
sink_s() : short interleaved data source

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Usage

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usrp.sink_x(which=0, interp_rate=128, nchan=1, mux=0x98,
fusb_block_size=0, fusb_nblocks=0,
fpga_filename="", firmware_filename="")

Parameters
Examples
Note

1.28.2.1)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.2)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.3)
Type
Description

set_interp_rate()
Sub Function
Set interpolator rate. Rate must be in [4, 512] and a multiple of 4. The final complex
sample rate across the USB is dac_freq () / interp_rate () * nchannels ()
usrp.sink_x.set_interp_rate(rate)
rate : unsigned integer

set_nchannels()
Sub Function
Set number of active duc channels, nchannels must be 1 or 2.
usrp.sink_x.set_nchannels(nchan)
nchan : integer

set_mux()
Sub Function
This determines which DAC is connected to each DUC input. There are 2 DUCs. Each
has two inputs.
Mux value:
3
2
1
10987654321098765432109876543210
+-------------------------------+-------+-------+-------+-------+
|
| DAC3 | DAC2 | DAC1 | DAC0 |
+-------------------------------+-------+-------+-------+-------+
There are two interpolators with complex inputs and outputs.
There are four DACs.
Each 4-bit DACx field specifies the source for the DAC and whether or not that DAC is
enabled. Each subfield is coded like this:
3210
+-+-----+
|E| N |
+-+-----+
Where E is set if the DAC is enabled, and N specifies which interpolator output is
connected to this DAC.
N which interp output

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--0
1
2
3
Usage
Parameters
Examples
Note

1.28.2.4)
Type
Description

Usage
Parameters

------------------chan 0 I
chan 0 Q
chan 1 I
chan 1 Q

usrp.sink_x.set_mux(mux)
mux : integer

set_tx_freq()
Sub Function
Set the frequency of the digital up converter, channel must be 0,1and freq is the center
frequency in Hz. It must be in the range [-44M, 44M]. The frequency specified is
quantized. Use tx_freq to retrieve the actual value used.
usrp.sink_x.set_tx_freq(channel,freq)
channel: which duc channel [0, 1]
freq : double

Examples
Note

1.28.2.5)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.6)
Type
Description

Usage
Parameters

set_verbose()
Sub Function
Print usrp configuration
usrp.sink_x.set_verbose(verbose)
verbose : bool true or false

set_pga()
Sub Function
Set D/A Programmable Gain Amplifier (PGA). Gain is rounded to closest setting
supported by hardware. Note that DAC 0 and DAC 1 share a gain setting as do DAC 2
and DAC 3. Setting DAC 0 affects DAC 1 and vice versa. Same with DAC 2 and DAC 3.
Return true if sucessful
usrp.sink_x.set_pga(which, gain_in_db)
which : which D/A [0,3]
gain_in_db : double gain value (linear in dB) in range [0.0,20.0]

Examples
Note

1.28.2.7)
Type
Description

pga()
Sub Function
Return programmable gain amplifier gain setting in dB.

Simple Gnuradio User Manual

Usage
Parameters
Examples
Note

1.28.2.8)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.9)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.10)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.11)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.12)
Type
Description
Usage
Parameters

usrp.sink_x.pga(which)
which : which D/A [0,3]

pga_min()
Sub Function
Return minimum legal PGA setting in dB.
usrp.sink_x.pga_min()

pga_max()
Sub Function
Return maximum legal PGA setting in dB.
usrp.sink_x.pga_max()

pga_db_per_step()
Sub Function
Return hardware step size of PGA (linear in dB).
usrp.sink_x.pga_db_per_step()

fpga_master_clock_freq()
Sub Function
Return fpga master clock frequency
usrp.sink_x.fpga_master_clock_freq()

converter_rate()
Sub Function
Return D/A converter rate
usrp.sink_x.converter_rate()

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Simple Gnuradio User Manual

Examples
Note

1.28.2.13)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.14)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.15)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.16)
Type
Description
Usage
Parameters
Examples
Note

interp_rate()
Sub Function
Return interpolation rate
usrp.sink_x.interp_rate()

nchannels()
Sub Function
Return number of active duc channels
usrp.sink_x.nchannels()

mux()
Sub Function
Return mux setting
usrp.sink_x.mux()

tx_freq()
Sub Function
Return channels duc frequency
usrp.sink_x.tx_freq(channel)
channel : which duc channel [0,3]

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1.28.2.17)
Type
Description

Usage
Parameters
Examples
Note

1.28.2.18)
Type
Description
Usage
Parameters

Page 163 of 208

daughterboard_id()
Sub Function
Return daughterboard ID for given Rx daughterboard slot. Slot A =0, Slot B=1.
daughterboard id >= 0 if successful
-1 if no daugherboard
-2 if invalid EEPROM on daughterboard
usrp.sink_x.daughterboard_id(which_dboardl)
which_dboard : o or 1, Slot number

write_aux_dac()
Sub Function
Write auxiliary digital to analog converter.
usrp.sink_x. write_aux_dac ( which_dboard, which_dac, value )
which_dboard : [0,1] which slot , SLOT_TX_A and SLOT_RX_A share the same AUX
DAC's. SLOT_TX_B and SLOT_RX_B share the same AUX DAC's.
which_dac : [2,3] TX slots must use only 2 and 3.
value : in range of [0,4095]

Examples
Note

1.28.2.19)
Type
Description
Usage
Parameters

read_aux_dac()
Sub Function
Read auxiliary analog to digital converter.
Return value in the range [0,4095] if successful, else READ_FAILED.
usrp.sink_x. read_aux_dac ( which_dboard, which_adc )
which_dboard : [0,1] which slot
which_adc : [0,1]

Examples
Note

1.28.2.20)
Type
Description
Usage
Parameters

Examples
Note

write_eeprom()
Sub Function
Write EEPROM on motherboard or any daughterboard.
Return true if successful
usrp.sink_x. write_eeprom(i2c_addr, eeprom_offset, buf)
i2c_addr : I2C bus address of EEPROM
eeprom_offset : byte offset in EEPROM to begin writing
buf : the data to write

Simple Gnuradio User Manual

1.28.2.21)
Type
Description
Usage
Parameters

Page 164 of 208

read_eeprom()
Sub Function
Read bytes from EEPROM on motherboard or any daughterboard.
Return the data read if successful, else a zero length string.
usrp.sink_x. read_eeprom(i2c_addr, eeprom_offset, len)
i2c_addr : I2C bus address of EEPROM
eeprom_offset : byte offset in EEPROM to begin reading
buf : number of bytes to read

Examples
Note

1.28.2.22)
Type
Description
Usage
Parameters

write_i2c()
Sub Function
Write to I2C peripheral.
Return true ff successful. Writes are limited to a maximum of of 64 bytes.
usrp.sink_x. write_i2c(i2c_addr, buf)
i2c_addr : I2C bus address (7-bits)
buf : the data to write

Examples
Note

1.28.2.23)
Type
Description

Usage
Parameters

read_i2c()
Sub Function
Read from I2C peripheral.
Return the data read if successful, else a zero length string. Reads are limited to a
maximum of of 64 bytes.
usrp.sink_x.read_i2c(i2c_addr, len)
i2c_addr : I2C bus address (7-bits)
len : number of bytes to read

Examples
Note

1.28.2.24)
Type
Description
Usage
Parameters

set_adc_offset()
Sub Function
Set ADC offset correction.
usrp.sink_x.set_adc_offset(which, offset)
which : which ADC[0,3]:
offset : 16-bit value to subtract from raw ADC input.

Examples
Note

1.28.2.25)
Type
Description
Usage
Parameters

set_dac_offset()
Sub Function
Set DAC offset correction.
usrp.sink_x.set_dac_offset(which, offset, offset_pin)
which : which DAC[0,3]

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offset : 10-bit offset value (ambiguous format: See AD9862 datasheet).
offset_pin : 1-bit value. If 0 offset applied to -ve differential pin; If 1 offset applied to +ve
differential pin.
Examples
Note

1.28.2.26)
Type
Description
Usage
Parameters

set_adc_buffer_bypass()
Sub Function
Control ADC input buffer.
usrp.sink_x.set_adc_buffer_bypass(which, bypass)
which : which ADC [0,3]
bypass : if non-zero, bypass input buffer and connect input directly to switched cap SHA
input of RxPGA.

Examples
Note

1.28.2.27)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.28)
Type
Description

Usage
Parameters

serial_number()
Sub Function
Return the usrp's serial number. Return non-zero length string iff successful.
usrp.sink_x.serial_number()

_write_oe()
Sub Function
Write direction register (output enables) for pins that go to daughterboard. Each d'board
has 16-bits of general purpose i/o. Setting the bit makes it an output from the FPGA to
the d'board.This register is initialized based on a value stored in the d'board EEPROM. In
general, you shouldn't be using this routine without a very good reason. Using this
method incorrectly will kill your USRP motherboard and/or daughterboard.
usrp.sink_x._write_oe(which_dboard, value, mask)
which_dboard : [0,1] which d'board
value : value to write into register
mask : which bits of value to write into reg

Examples
Note

1.28.2.29)
Type
Description
Usage
Parameters

write_io()
Sub Function
Write daughterboard i/o pin value.
usrp.sink_x.write_io(which_dboard, value, mask)
which_dboard : [0,1] which d'board

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value : value to write into register
mask : which bits of value to write into reg
Examples
Note

1.28.2.30)
Type
Description
Usage
Parameters
Examples
Note

1.28.2.31)
Type
Description
Usage
Parameters

read_io()
Sub Function
Read daughterboard i/o pin value.
Return register value if successful, else READ_FAILED
usrp.sink_x.read_io(which_dboard)
which_dboard : [0,1] which d'board
READ_FAILED =-99999

_write_fpga_reg()
Sub Function
Write FPGA register.
Return True if successful
usrp.sink_x._write_fpga_reg(regno,value)
regno : 7-bit register number
value : 32-bit value

Examples
Note

1.28.2.32)
Type
Description
Usage
Parameters

_write_fpga_reg_masked()
Sub Function
Write FPGA register masked.
Return True if successful
usrp.sink_x._write_fpga_reg_masked(regno, value, mask)
regno : 7-bit register number
value : 16-bit value
mask : 16 bit mask

Examples
Note

1.28.2.33)
Type
Description
Usage

_read_fpga_reg()
Sub Function
Read FPGA registers.
Return register value if successful, else READ_FAILED
usrp.sink_x._read_fpga_reg(regno)

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Parameters
Examples
Note
1.28.2.34)
Type
Description
Usage
Parameters

Page 167 of 208

regno : 7-bit register number

_write_9862()
Sub Function
Write AD9862 registers.
Return true if successful
usrp.sink_x._write_9862(which_codec, regno, value)
which_codec : 0 or 1
regno : 6-bit register number
value : 8-bit value

Examples
Note

1.28.2.35)
Type
Description
Usage
Parameters

_read_9862()
Sub Function
Read AD9862 registers.
Return register value if successful, else READ_FAILED
usrp.sink_x._read_9862(which_codec, regno)
which_codec : 0 or 1
regno : 6-bit register number

Examples
Note

1.28.2.36)
Type
Description

Usage
Parameters

Examples
Note

_write_spi()
Sub Function
Write data to SPI bus peripheral.
SPI == "Serial Port Interface". SPI is a 3 wire bus plus a separate enable for each
peripheral. The common lines are SCLK,SDI and SDO. The FX2 always drives SCLK
and SDI, the clock and data lines from the FX2 to the peripheral. When enabled, a
peripheral may drive SDO, the data line from the peripheral to the FX2.
The SPI_READ and SPI_WRITE commands are formatted identically.
Each specifies which peripherals to enable, whether the bits should be transmistted Most
Significant Bit first or Least Significant Bit first, the number of bytes in the optional
header, and the number of bytes to read or write in the body.
The body is limited to 64 bytes. The optional header may contain 0, 1 or 2 bytes. For an
SPI_WRITE, the header bytes are transmitted to the peripheral followed by the the body
bytes. For an SPI_READ, the header bytes are transmitted to the peripheral, then len
bytes are read back from the peripheral.(see : usrp_spi_defs.h file). If format specifies
that optional_header bytes are present, they are written to the peripheral immediately
prior to writing buf.
Return true if successful. Writes are limited to a maximum of 64 bytes.
usrp.sink_x._write_spi(optional_header, enables, format, buf)
optional_header : 0,1 or 2 bytes to write before buf.
enables : bitmask of peripherals to write.
format : transaction format. SPI_FMT_*
buf : the data to write

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1.28.2.37)
Type
Description
Usage
Parameters

Page 168 of 208

_read_spi()
Sub Function
Read data from SPI bus peripheral.
Return the data read if successful, else a zero length string.
usrp.sink_x._read_spi(optional_header, enables, format, len)
optional_header : 0,1 or 2 bytes to write before buf.
enables : bitmask of peripherals to write.
format : transaction format. SPI_FMT_*
len : number of bytes to read.

Examples
Note

1.29)

gnuradio/usrp_multi.py

Type
Description

Examples
Note

Python file
With this code you can connect two or more usrps (with a locked clock) and get
synchronised samples.You must connect a (flat)cable between a dboard on the master in
RXA and a dboard on the slave in RXA.You then put one usrp in master mode, put the
other in slave mode.
Warning, allways FIRST enable the slave before you enable the master This is to be
sure you don't have two masters connecting to each other Otherwise you could ruin your
hardware because the two sync outputs would be connected together.
You determine which is the master by master_serialno (this is a text string a hexadecimal
number).If you enter a serial number which is not found it will print the serial numbers
which are available.If you give no serial number (master_serialno=None), the code will
pick a Master for you.
The gnuradio-examples/python/multi_usrp directory contains examples
To Synchroniza master and slave clocks, connect the 64MHz clocks between the boards
with a short sma coax cable.(See the wiki on how to enable clock-out and clock-in
http://gnuradio.org/trac/wiki/USRPClockingNotes )
You Needsone board with a clock out and one board with a clock in. You can choose any
of the two boards as master or slave; this is not dependant on which board has the clockout or in.
In the experiments, we had fewer problems when the board that has the clock-in will be
the master board. You can use a standard 16-pole flatcable to connect tvrx, basic-rx or
dbsrx boards. Of this 16pin flatcable only two pins are used (io15 and ground)
For all new daughterboards which use up a lot of io pins you have to use a cable with
fewer connections. The savest is using a 2pin headercable connected to io15,gnd (a
cable like the ones used to connect frontpanel leds to the mainboard of a PC)
If using basic rx board:
Connect a 16-pole flatcable from J25 on basicrx/dbs_rx in rxa of the master usrp to J25
on basicrx/dbsrx in RXA of the slave usrp
Don't twist the cable (Make sure the pin1 marker (red line on the flatcable) is on the
same side of the connector (at io-8 on the master and at io8 on the slave.))
For basic_rx this means the marker should be on the side of the dboard with the sma
connectors.
For dbs_rx this means the marker should be on the side of the dboard with the two little
chips. In other words, don't twist the cable; you will burn your board if you do.
You can also connect a flatcable with multiple connectors from master-J25 to slave1-J25
to slave2-J25 to ...
You will however have to think of something to create a common 64Mhz clock for more
then two usrps.
For all other daughterboards, connect a 2wire cable from masterRXA J25 io15, gnd to
slaveRXA J25 io15, gnd. Now the hardware is setup.

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1.29.1) multi_source_align ()
Type
Description

Usage

Parameters

Function
Align multiple sources (USRPs) using sample numbers in the first channel. Takes two
ore more sources producing interleaved shorts.
Produces: nchan * nsources gr_complex output streams.
usrp_multi.multi_source_align(fg,
master_serialno,decim,nchan=2,pga_gain=0.0,cordic_freq=0.0,mux=None,align_int
erval=-1)
nchan: number of interleaved channels in source 2 or 4.
align_interval: number of samples to minimally skip between alignments.
default =
-1 which means align only once per work call.
master_serial_no: Serial_no of the usrp which should be the MASTER

Examples
Note

1.29.1.1)
Type
Description
Usage
Parameters
Examples
Note

1.29.1.2)
Type
Description
Usage
Parameters
Examples
Note

1.29.1.3)
Type
Description

Usage
Parameters
Examples
Note

get_master_usrp ()
Sub Function
Get the instance of the master USRP
usrp_multi.multi_source_align.get_master_usrp()

get_slave_usrp ()
Sub Function
Get the instance of the slave USRP
usrp_multi.multi_source_align.get_slave_usrp()

get_master_source_c ()
Sub Function
Get the instance of the master USRP source channels. When we connect this instance,
we can use the port number to get the channels from the master one
(usrp_multi.multi_source_align.get_master_source_c(),1),
(usrp_multi.multi_source_align.get_master_source_c(),2),
usrp_multi.multi_source_align.get_master_source_c()

These blocks have multiple outputs.
output 0 is the sample counter (high bits in I, low bits in Q)
You normally don't Needsthe samplecounters so you can ignore output 0
output 1 is the first aligend output channel (if you enable 2 or 4 channels)
output 2 is the second output channel (only if you enable 4 channels)

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1.29.1.4)
Type
Description

Usage
Parameters
Examples
Note

1.29.1.5)
Type
Description

Usage
Parameters
Examples
Note

1.29.1.6)
Type
Description
Usage
Parameters
Examples
Note

1.29.1.7)
Type
Description
Usage
Parameters
Examples
Note

Page 170 of 208

get_slave_source_c ()
Sub Function
Get the instance of the slave USRP source channels. When we connect this instance,
we can use the port number to get the channels from the slave one
(usrp_multi.multi_source_align.get_slave_source_c(),1),
(usrp_multi.multi_source_align.get_slave_source_c(),2),
usrp_multi.multi_source_align.get_slave_source_c()

These blocks have multiple outputs.
output 0 is the sample counter (high bits in I, low bits in Q)
You normally don't Needsthe samplecounters so you can ignore output 0
output 1 is the first aligend output channel (if you enable 2 or 4 channels)
output 2 is the second output channel (only if you enable 4 channels)

sync ()
Sub Function
Called to synchroniza master and slave USRPs. You must call sync() at least once
AFTER the flowgraph has started running.(This will synchronise the streams of the two
usrps)
usrp_multi.multi_source_align.sync()

print_db_info ()
Sub Function
Print master and slave daughterboards side and name
usrp_multi.multi_source_align.print_db_info()

tune_all_rx ()
Sub Function
Tune all master and slave USRP 4 receive daughterboards to certen frequency.
usrp_multi.multi_source_align.tune_all_rx(target_freq)

This will only work reliably when you have all the same daughterboards.Otherwise set all
freqs and gains individually.

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1.29.1.8)
Type
Description
Usage
Parameters
Examples
Note

1.30)

Note

Python file
Debug tool for Tx. Transmit debugger.
tx_debug_gui.tx_debug_gui(tx_subdev, title="Tx Debug")
To show the frame :
debugger = tx_debug_gui.tx_debug_gui(subdev)
debugger.Show(True)

Python file
Debug tool for flexrf boards.
flexrf_debug_gui.flexrf_debug_gui(flexrf, title="Flexrf Debug")
flexrf: USRP source instance
To show the frame :
debugger = flexrf_debug_gui.flexrf_debug_gui(flexrf)
debugger.Show(True)

Python file
This is the abstract base class for all daughterboards.This defines the required
operations and interfaces for all d'boards.
All functions in this file will be mapped into daughterboards details as seen below.

gnuradio/db_basic.py

Type
Description
Note

This will only work reliably when you have all the same daughterboards.Otherwise set all
freqs and gains individually.

gnuradio/db_base.py

Type
Description

1.33)

Sub Function
Set the gain for all master and slave USRP 4 receive daughterboards.
usrp_multi.multi_source_align. set_gain_all_rx(gain)

gnuradio/flexrf_debug_gui.py

Type
Description
usage
Parameters
Examples
Note

1.32)

set_gain_all_rx ()

gnuradio/tx_debug_gui.py

Type
Description
usage
Examples
Note

1.31)

Page 171 of 208

Python file
Handler for Basic Tx, Basic Rx, Low frequency TX, and Low frequency RX
daughterboards

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1.33.1) db_basic_tx ()
Type
Description
Usage
Parameters
Examples
Note

1.33.1.1)
Type
Description
Usage
Parameters
Examples
Note

1.33.1.2)
Type
Description
Usage
Parameters
Examples
Note

1.33.1.3)
Type
Description
Usage
Parameters
Examples
Note

Function
Handler for Basic Tx daughterboards
db_basic.db_basic_tx(usrp,which)
usrp: instance of usrp.sink
which: which side: 0 or 1 corresponding to TX_A or TX_B respectively
Board Technical specifications :
Min gain : 0 dB
Max gain :20 dB
Gain steps : 0.08 dB
Min frequency : -1e09 Hz
Max frequency : 1e09 Hz
Frequency Step : 1e-6 Hz

dbid ()
Sub Function
Return daughter board ID
db_basic.db_basic_tx.dbid()

name ()
Sub Function
Return daughter board name
db_basic.db_basic_tx.name()

side_and_name ()
Sub Function
Return daughter board side and name
db_basic.db_basic_tx.side_and_name()

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1.33.1.4)
Type
Description
Usage
Parameters
Examples
Note

1.33.1.5)
Type
Description

Usage
Parameters

Page 173 of 208

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type is tuple.
db_basic.db_basic_tx.freq_range()

set_freq ()
Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
db_basic.db_basic_tx.set_freq(target_freq)
taget_freq: target RF frequency in Hz
type target_freq: float

Examples
Note

1.33.1.6)
Type
Description
Usage
Parameters
Examples
Note

1.33.1.7)
Type
Description
Usage
Parameters
Examples
Note

1.33.1.8)
Type
Description

Usage

gain_range ()
Sub Function
Return range of gain that can be set by this d'board.
Returns (min_gain, max_gain, step_size), where gains are expressed in decibels
db_basic.db_basic_tx.gain_range()

set_gain ()
Sub Function
Set the gain.
Returns True/False
db_basic.db_basic_tx.set_gain(gain)
gain: gain in decibels

is_quadrature ()
Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
return True if this board requires both I & Q analog channels.
For this board, return True
db_basic.db_basic_tx.is_quadrature()

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Parameters
Examples
Note

1.33.2) db_basic_rx ()
Type
Description
Usage
Parameters

Examples
Note

1.33.2.1)
Type
Description
Usage
Parameters
Examples
Note

1.33.2.2)
Type
Description
Usage
Parameters
Examples
Note

1.33.2.3)
Type
Description
Usage
Parameters
Examples
Note

Function
Handler for Basic Rx daughterboards
db_basic.db_basic_rx(usrp,which,subdev)
usrp: instance of usrp.source
which: which side: 0 or 1 corresponding to RX_A or RX_B respectively
subdev: which analog i/o channel: 0 or 1
Board Technical specifications :
Min gain : 0 dB
Max gain :20 dB
Gain steps : 1 dB
Min frequency : -1e09 Hz
Max frequency : 1e09 Hz
Frequency Step : 1e-6 Hz

dbid ()
Sub Function
Return daughter board ID
db_basic.db_basic_rx.dbid()

name ()
Sub Function
Return daughter board name
db_basic.db_basic_rtx.name()

side_and_name ()
Sub Function
Return daughter board side and name
db_basic.db_basic_rx.side_and_name()

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1.33.2.4)
Type
Description
Usage
Parameters
Examples
Note

1.33.2.5)
Type
Description

Usage
Parameters

Page 175 of 208

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
db_basic.db_basic_rx.freq_range()

set_freq ()
Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
db_basic.db_basic_rx.set_freq(target_freq)
target_freq: target RF frequency in Hz
type target_freq: float

Examples
Note

1.33.2.6)
Type
Description
Usage
Parameters
Examples
Note

1.33.2.7)
Type
Description
Usage
Parameters
Examples
Note

gain_range ()
Sub Function
Return range of gain that can be set by this d'board.
Returns (min_gain, max_gain, step_size), where gains are expressed in decibels
db_basic.db_basic_rx.gain_range()

set_gain ()
Sub Function
Set the gain.
Returns True/False if successful.
db_basic.db_basic_rx.set_gain(gain)
gain: gain in decibels

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1.33.2.8)

Page 176 of 208

is_quadrature ()

Type
Description

Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
return True if this board requires both I & Q analog channels.
For this board, return False.
db_basic.db_basic_rx.is_quadrature()

Usage
Parameters
Examples
Note

1.33.3) db_lf_rx ()
Type
Description
Usage
Parameters

Examples
Note

1.33.3.1)
Type
Description
Usage
Parameters
Examples
Note

1.33.3.2)
Type
Description
Usage
Parameters
Examples
Note

1.33.3.3)
Type
Description
Usage

Function
Handler for Low frequency Rx daughterboards
db_basic.db_lf_rx(usrp,which,subdev)
usrp: instance of usrp.source
which: which side: 0 or 1 corresponding to RX_A or RX_B respectively
subdev: which analog i/o channel: 0 or 1
Board Technical specifications :
Min gain : 0 dB
Max gain :20 dB
Gain steps : 1 dB
Min frequency : -32e06 Hz
Max frequency : 32e06 Hz
Frequency Step : 1e-6 Hz

dbid ()
Sub Function
Return daughter board ID
db_basic.db_ lf _rx.dbid()

name ()
Sub Function
Return daughter board name
db_basic.db_ lf _rtx.name()

side_and_name ()
Sub Function
Return daughter board side and name
db_basic.db_ lf _rx.side_and_name()

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Parameters
Examples
Note

1.33.3.4)
Type
Description

Usage
Parameters
Examples
Note

1.33.3.5)
Type
Description

Usage
Parameters

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
We cover the first nyquist zone only
db_basic.db_ lf _rx.freq_range()

set_freq ()
Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
db_basic.db_ lf _rx.set_freq(target_freq)
target_freq: target RF frequency in Hz
type freq: float

Examples
Note

1.33.3.6)
Type
Description
Usage
Parameters
Examples
Note

1.33.3.7)
Type
Description
Usage
Parameters
Examples
Note

gain_range ()
Sub Function
Return range of gain that can be set by this d'board.
returns (min_gain, max_gain, step_size), where gains are expressed in decibels
db_basic.db_ lf _rx.gain_range()

set_gain ()
Sub Function
Set the gain.
Returns True/False if successful.
db_basic.db_ lf _rx.set_gain(gain)
gain: gain in decibels

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1.33.3.8)

Page 178 of 208

is_quadrature ()

Type
Description

Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
return True if this board requires both I & Q analog channels.
For this board, return False
db_basic.db_ lf _rx.is_quadrature()

Usage
Parameters
Examples
Note

1.33.4) db_lf_tx ()
Type
Description
Usage
Parameters
Examples
Note

1.33.4.1)
Type
Description
Usage
Parameters
Examples
Note

1.33.4.2)
Type
Description
Usage
Parameters
Examples
Note

Function
Handler for Low frequency Tx daughterboards
db_basic.db_lf_tx(usrp,which)
usrp: instance of usrp.sink
which: which side: 0 or 1 corresponding to TX_A or TX_B respectively
Board Technical specifications :
Min gain : 0 dB
Max gain :20 dB
Gain steps : 0.08 dB
Min frequency : -32e06 Hz
Max frequency : 32e06 Hz
Frequency Step : 1e-6 Hz

dbid ()
Sub Function
Return daughter board ID
db_basic.db_ lf _tx.dbid()

name ()
Sub Function
Return daughter board name
db_basic.db_ lf _tx.name()

Simple Gnuradio User Manual

1.33.4.3)
Type
Description
Usage
Parameters
Examples
Note

1.33.4.4)
Type
Description
Usage
Parameters
Examples
Note

1.33.4.5)
Type
Description

Usage
Parameters

Page 179 of 208

side_and_name ()
Sub Function
Return daughter board side and name
db_basic.db_ lf _tx.side_and_name()

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
db_basic.db_ lf _tx.freq_range()

set_freq ()
Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
db_basic.db_ lf _tx.set_freq(target_freq)
target_freq: target RF frequency in Hz
type freq: float

Examples
Note

1.33.4.6)
Type
Description
Usage
Parameters
Examples
Note

1.33.4.7)
Type
Description
Usage
Parameters
Examples
Note

gain_range ()
Sub Function
Return range of gain that can be set by this d'board.
Returns (min_gain, max_gain, step_size), where gains are expressed in decibels
db_basic.db_ lf _tx.gain_range()

set_gain ()
Sub Function
Set the gain.
Returns True/False if successful.
db_basic.db_ lf _tx.set_gain(gain)
gain: gain in decibels

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1.33.4.8)
Type
Description

Usage
Parameters
Examples
Note

1.34)

Page 180 of 208

is_quadrature ()
Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
return True if this board requires both I & Q analog channels.
For this board, return True
db_basic.db_ lf _tx.is_quadrature()

gnuradio/db_dbs_rx.py

Type
Description
Note

Python file
Control DBS receiver based USRP daughterboard.

1.34.1) db_dbs_rx ()
Type
Description
Usage
Parameters
Examples
Note

1.34.1.1)
Type
Description
Usage
Parameters
Examples
Note

1.34.1.2)
Type
Description
Usage
Parameters
Examples

Function
Control DBS receiver based USRP daughterboard.
db_ dbs_rx.db_dbs_rx(usrp,which)
usrp: instance of usrp source
which: which side: 0 or 1 corresponding to side A or side B respectively
Board Technical specifications :
Min gain : 0 dB
Max gain :104 dB
Gain steps : 1 dB
Min frequency : 500e06 Hz
Max frequency : 2600 e06 Hz
Frequency Step : 1e6 Hz

dbid ()
Sub Function
Return daughter board ID
db_ dbs_rx.db_ dbs _rx.dbid()

name ()
Sub Function
Return daughter board name
db_ dbs_rx.db_ dbs _rtx.name()

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Note

1.34.1.3)
Type
Description
Usage
Parameters
Examples
Note

1.34.1.4)
Type
Description
Usage
Parameters
Examples
Note

1.34.1.5)
Type
Description

Usage
Parameters

side_and_name ()
Sub Function
Return daughter board side and name
db_ dbs_rx.db_ dbs _rx.side_and_name()

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
db_ dbs_rx.db_ dbs _rx.freq_range()

set_freq ()
Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
db_ dbs_rx.db_ dbs _rx.set_freq(target_freq)
taget_freq: target RF frequency in Hz
type freq: float

Examples
Note

1.34.1.6)
Type
Description
Usage
Parameters
Examples
Note

gain_range ()
Sub Function
Return range of gain that can be set by this d'board.
Returns (min_gain, max_gain, step_size), where gains are expressed in decibels
db_ dbs_rx.db_ dbs _rx.gain_range()

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1.34.1.7)
Type
Description
Usage
Parameters
Examples
Note

1.34.1.8)
Type
Description

Usage
Parameters
Examples
Note

1.34.1.9)
Type
Description
Usage
Parameters
Examples
Note

1.35)

set_gain ()
Sub Function
Set the gain.
Returns True/False if successful
db_ dbs_rx.db_ dbs _rx.set_gain(gain)
gain: gain in decibels

is_quadrature ()
Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
return True if this board requires both I & Q analog channels.
For this board, return True.
db_ dbs_rx.db_ dbs _rx.is_quadrature()

set_bw ()
Sub Function
Set the bandwidth for the receive channel. Bandwidth should be more than or equal
1MHz and less than 33 MHz
db_ dbs_rx.db_ dbs _rx.set_bw(bw)

gnuradio/db_flexrf.py
gnuradio/db_flexrf_mimo.py

Type
Description
Note

Python files
Interface functions for all flexrf USRP daughter boards

1.35.1) db_flexrf_xxxx_tx ()
db_flexrf_xxxx_tx_mimo_x()
Type
Description

Function
Handler for flexrf Tx daughterboards :
flex_400_tx
flex_900_tx
flex_1200_tx
flex_1800_tx
flex_2400_tx
flex_400_tx_mimo_a
flex_900_tx_mimo_a
flex_1200_tx_mimo_a

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flex_1800_tx_mimo_a
flex_2400_tx_mimo_a
flex_400_tx_mimo_b
flex_900_tx_mimo_b
flex_1200_tx_mimo_b
flex_1800_tx_mimo_b
flex_2400_tx_mimo_b
db_flexrf.db_flexrf_xxxx_tx(usrp,which)
or
db_flexrf.db_flexrf_xxxx_tx_mimo_x(usrp,which)
usrp: instance of usrp.sink
which: which side: 0 or 1 corresponding to TX_A or TX_B respectively

Usage

Parameters
Examples
Note
Dboard
flex_400_tx
flex_900_tx
flex_1200_tx
flex_1800_tx
flex_2400_tx
flex_400_tx_mimo_a
flex_900_tx_mimo_a
flex_1200_tx_mimo_a
flex_1800_tx_mimo_a
flex_2400_tx_mimo_a
flex_400_tx_mimo_b
flex_900_tx_mimo_b
flex_1200_tx_mimo_b
flex_1800_tx_mimo_b
flex_2400_tx_mimo_b

1.35.1.1)
Type
Description
Usage
Parameters
Examples
Note

1.35.1.2)
Type
Description
Usage
Parameters
Examples
Note

RF TX power
100mW (20 dBm)
200 mW (23 dBm)
200 mW (23 dBm)
100 mW (20 dBm)
50 mW (17 dBm)
100mW (20 dBm)
200 mW (23 dBm)
200 mW (23 dBm)
100 mW (20 dBm)
50 mW (17 dBm)
100mW (20 dBm)
200 mW (23 dBm)
200 mW (23 dBm)
100 mW (20 dBm)
50 mW (17 dBm)

Min Frequency
400 MHz
750 MHz
1150 MHz
1500 MHz
2300 MHz
400 MHz
750 MHz
1150 MHz
1500 MHz
2300 MHz
400 MHz
750 MHz
1150 MHz
1500 MHz
2300 MHz

Max Frequency
500 MHz
1050 MHz
1450 MHz
2100 MHz
2900 MHz
500 MHz
1050 MHz
1450 MHz
2100 MHz
2900 MHz
500 MHz
1050 MHz
1450 MHz
2100 MHz
2900 MHz

Frequency Step
1 MHz
4 MHz
4 MHz
4 MHz
4 MHz
1 MHz
4 MHz
4 MHz
4 MHz
4 MHz
1 MHz
4 MHz
4 MHz
4 MHz
4 MHz

dbid ()
Sub Function
Return daughter board ID
subdev.dbid()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

name ()
Sub Function
Return daughter board name
subdev.name()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)

Simple Gnuradio User Manual

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where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

1.35.1.3)
Type
Description
Usage
Parameters
Examples
Note

1.35.1.4)
Type
Description
Usage
Parameters
Examples
Note

1.35.1.5)
Type
Description

Usage
Parameters
Examples
Note

side_and_name ()
Sub Function
Return daughter board side and name
subdev.side_and_name()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
subdev.freq_range()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_freq ()
Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
subdev.set_freq(target_freq)
target_freq: target RF frequency in Hz
type freq: float
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

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1.35.1.6)
Type
Description

Usage
Parameters
Examples
Note

1.35.1.7)
Type
Description
Usage
Parameters
Examples
Note

1.35.1.8)
Type
Description
Usage
Parameters
Examples
Note

is_quadrature ()
Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
Return True if this board requires both I & Q analog channels.
For this board, return True
subdev.is_quadrature()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_auto_tr ()
Sub Function
Enable automatic Transmit/Receive switching (ATR).
subdev.set_auto_tr(on)
on : bool True or False
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_enable ()
Sub Function
Enable /Disable RF Transmitter
subdev.set_enable(on)
on : bool True or False
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

1.35.2) db_flexrf_xxxx_rx ()
db_flexrf_xxxx_rx_mimo_x()
Type
Description

Function
Handler for flexrf Rx daughterboards :
flex_400_rx
flex_900_rx

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flex_1200_rx
flex_1800_rx
flex_2400_rx
flex_400_rx_mimo_a
flex_900_rx_mimo_a
flex_1200_rx_mimo_a
flex_1800_rx_mimo_a
flex_2400_rx_mimo_a
flex_400_rx_mimo_b
flex_900_rx_mimo_b
flex_1200_rx_mimo_b
flex_1800_rx_mimo_b
flex_2400_rx_mimo_b
db_flexrf.db_flexrf_xxxx_rx(usrp,which)
or
db_flexrf.db_flexrf_xxxx_rx_mimo_x(usrp,which)
usrp: instance of usrp source
which: which side: 0 or 1 corresponding to RX_A or RX_B respectively

Usage

Parameters
Examples
Note
Dboard
flex_400_rx
flex_900_rx
flex_1200_rx
flex_1800_rx
flex_2400_rx
flex_400_rx_mimo_a
flex_900_rx_mimo_a
flex_1200_rx_mimo_a
flex_1800_rx_mimo_a
flex_2400_rx_mimo_a
flex_400_rx_mimo_b
flex_900_rx_mimo_b
flex_1200_rx_mimo_b
flex_1800_rx_mimo_b
flex_2400_rx_mimo_b

1.35.2.1)
Type
Description
Usage
Parameters
Examples
Note

1.35.2.2)
Type
Description
Usage
Parameters

Max
Gain
65
90
90
90
90
65
90
90
90
90
65
90
90
90
90

Gain
Step
.035
.05
.05
.05
.05
.035
.05
.05
.05
.05
.035
.05
.05
.05
.05

Min Frequency

Max Frequency

Frequency Step

400 MHz
750 MHz
1150 MHz
1500 MHz
2300 MHz
400 MHz
750 MHz
1150 MHz
1500 MHz
2300 MHz
400 MHz
750 MHz
1150 MHz
1500 MHz
2300 MHz

500 MHz
1050 MHz
1450 MHz
2100 MHz
2900 MHz
500 MHz
1050 MHz
1450 MHz
2100 MHz
2900 MHz
500 MHz
1050 MHz
1450 MHz
2100 MHz
2900 MHz

1 MHz
4 MHz
4 MHz
4 MHz
4 MHz
1 MHz
4 MHz
4 MHz
4 MHz
4 MHz
1 MHz
4 MHz
4 MHz
4 MHz
4 MHz

dbid ()
Sub Function
Return daughter board ID
subdev.dbid()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

name ()
Sub Function
Return daughter board name
subdev.name()

Simple Gnuradio User Manual

Examples
Note

1.35.2.3)
Type
Description
Usage
Parameters
Examples
Note

1.35.2.4)
Type
Description
Usage
Parameters
Examples
Note

1.35.2.5)
Type
Description

Usage
Parameters
Examples
Note

Page 187 of 208

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

side_and_name ()
Sub Function
Return daughter board side and name
subdev.side_and_name()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
subdev.freq_range()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_freq ()
Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
subdev.set_freq(target_freq)
target_freq: target RF frequency in Hz
type freq: float
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

Simple Gnuradio User Manual

1.35.2.6)
Type
Description
Usage
Parameters
Examples
Note

1.35.2.7)
Type
Description
Usage
Parameters
Examples
Note

1.35.2.8)
Type
Description

Usage
Parameters
Examples
Note

1.35.2.9)
Type
Description
Usage

Page 188 of 208

gain_range ()
Sub Function
Return range of gain that can be set by this d'board.
Returns (min_gain, max_gain, step_size), where gains are expressed in decibels
subdev.gain_range()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_gain ()
Sub Function
Set the gain.
Returns True/False if successful.
subdev.set_gain(gain)
gain: gain in decibels
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

is_quadrature ()
Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
return True if this board requires both I & Q analog channels.
For this board, return True
subdev.is_quadrature()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_auto_tr ()
Sub Function
Enable automatic Transmit/Receive switching (ATR).
subdev.set_auto_tr(on)

Simple Gnuradio User Manual

Parameters
Examples
Note

1.35.2.10)
Type
Description
Usage
Parameters
Examples
Note

1.35.2.11)
Type
Description
Usage
Parameters
Examples
Note

1.36)

1.37)

on : bool True or False
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

select_rx_antenna ()
Sub Function
Specify which antenna port to use for reception. Choose either 'TX/RX' or 'RX2'
subdev.select_rx_antenna(which_antenna)
which_antenna: either 'TX/RX' or 'RX2'
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

i_and_q_swapped ()
Sub Function
Return True if this is a quadrature device and ADC 0 is Q.
subdev.i_and_q_swapped()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

gnuradio/db_instantiator.py

Type
Description
Note

Python files
Instantiator for accessing USRP daughter boards

gnuradio/db_tv_rx.py

Type
Description
Note

Page 189 of 208

Python file
Control Microtune 4937 based USRP daughterboard

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Page 190 of 208

1.37.1) db_tv_rx ()
Type
Description

Usage
Parameters
Examples
Note

Function
Control Microtune 4937 based USRP daughterboard. Three version are invented so far,
TV_RX, First IF = 43.75 MHz, second IF = 5.75e6 MHz with second downconversion.
TV_RX_REV_2, First IF =44 MHz, second IF = 20 MHz without second downconversion
TV_RX_REV_3, First IF = 44 MHz, second IF = 20 MHz without second downconve The
The TV_RX 43.75 MHz version has inverted spectrum
db_ tv_rx.db_tv_rx(usrp,which,first_IF,second_IF)
usrp: instance of usrp source
which: which side: 0 or 1 corresponding to side A or side B respectively
Board Technical specifications :
Min gain : 0 dB
Max gain :115 dB
Gain steps : 1 dB
Min frequency : 50e06 Hz
Max frequency : 860 e06 Hz
Frequency Step : 10e03 Hz

1.37.1.1) dbid ()
Type
Description
Usage
Parameters
Examples
Note

1.37.1.2)

Sub Function
Return daughter board ID
db_ tv_rx.db_ tv _rx.dbid()

name ()

Type
Description
Usage
Parameters
Examples
Note

Sub Function
Return daughter board name
db_ tv _rx.db_ tv _rtx.name()

1.37.1.3) side_and_name ()
Type
Description
Usage
Parameters
Examples
Note

Sub Function
Return daughter board side and name
db_ tv _rx.db_ tv _rx.side_and_name()

Simple Gnuradio User Manual

1.37.1.4)

freq_range ()

Type
Description
Usage
Parameters
Examples
Note

1.37.1.5)

Page 191 of 208

Sub Function
Return range of frequencies in Hz that can be tuned by this d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
db_ tv _rx.db_ tv _rx.freq_range()

set_freq ()

Type
Description

Usage
Parameters

Sub Function
Set the frequency.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
db_ tv _rx.db_ tv _rx.set_freq(target_freq)
targhet_freq: target RF frequency in Hz
type freq: float

Examples
Note

1.37.1.6)

gain_range ()

Type
Description
Usage
Parameters
Examples
Note

1.37.1.7)

set_gain ()

Type
Description
Usage
Parameters
Examples
Note

1.37.1.8)
Type
Description

Usage

Sub Function
Return range of gain that can be set by this d'board.
Returns (min_gain, max_gain, step_size), where gains are expressed in decibels
db_ tv _rx.db_ tv _rx.gain_range()

Sub Function
Set the gain.
Returns True/False if successful
db_ tv _rx.db_ tv _rx.set_gain(gain)
gain: gain in decibels

is_quadrature ()
Sub Function
Return True if this daughterboard does quadrature up or down conversion. That is,
return True if this board requires both I & Q analog channels.
For this board, return False
db_ tv _rx.db_ tv _rx.is_quadrature()

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Page 192 of 208

Parameters
Examples
Note

1.38)

gnuradio/db_wbx.py

Type
Description

Python file
This board is half-duplex. I.e., transmit and receive are mutually exclusive.There is a
single LO for both the Tx and Rx sides. The shared control signals are hung off of the Rx
side. The shared io controls are duplexed onto the Rx side pins. The wbx_high d'board
always needs to be in 'auto_tr_mode'

Note

1.38.1) db_wbx_lo_rx ()
Type
Description
Usage
Parameters
Examples
Note

1.38.1.1)
Type
Description
Usage
Parameters
Examples
Note

Function
Handlers for db_wbx_lo_rx dboard
db_wbx. db_wbx_lo_rx (usrp,which)
usrp: instance of usrp source
which: which side: 0 or 1 corresponding to side A or side B respectively
Board Technical specifications :
Min gain : 0 dB
Max gain :65 dB
Gain steps : .05dB
Min frequency : 50e06 Hz
Max frequency : 1000 e06 Hz
Frequency Step : 16e03 Hz

dbid ()
Sub Function
Return db_wbx_lo_rx daughter board ID
subdev.dbid()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

Simple Gnuradio User Manual

1.38.1.2)
Type
Description
Usage
Parameters
Examples
Note

1.38.1.3)
Type
Description
Usage
Parameters
Examples
Note

1.38.1.4)
Type
Description
Usage
Parameters
Examples
Note

1.38.1.5)
Type
Description

Usage

Page 193 of 208

name ()
Sub Function
Return db_wbx_lo_rx daughter board name
subdev.name()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

side_and_name ()
Sub Function
Return db_wbx_lo_rx daughter board side and name
subdev.side_and_name()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this db_wbx_lo_rx d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
subdev.freq_range()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_freq ()
Sub Function
Set the db_wbx_lo_rx frequency.
returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
subdev.set_freq(target_freq)

Simple Gnuradio User Manual

Parameters
Examples
Note

1.38.1.6)
Type
Description
Usage
Parameters
Examples
Note

1.38.1.7)
Type
Description
Usage
Parameters
Examples
Note

1.38.1.8)
Type
Description

Usage
Parameters
Examples
Note

Page 194 of 208

target_freq: target RF frequency in Hz
type freq: float
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

gain_range ()
Sub Function
Return range of gain that can be set by this db_wbx_lo_rx d'board.
Returns (min_gain, max_gain, step_size), where gains are expressed in decibels
subdev.gain_range()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_gain ()
Sub Function
Set the gain of db_wbx_lo_rx.
Returns True/False if successful.
subdev.set_gain(gain)
gain: gain in decibels
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

is_quadrature ()
Sub Function
Return True if this db_wbx_lo_rx daughterboard does quadrature up or down
conversion. That is, return True if this board requires both I & Q analog channels.
For this board, return True
subdev.is_quadrature()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

Simple Gnuradio User Manual

1.38.1.9)
Type
Description
Usage
Parameters
Examples
Note

1.38.1.10)
Type
Description
Usage
Parameters
Examples
Note

1.38.1.11)
Type
Description
Usage
Parameters
Examples
Note

set_auto_tr ()
Sub Function
Enable automatic Transmit/Receive switching (ATR).
subdev.set_auto_tr(on)
on : bool True or False
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

select_rx_antenna ()
Sub Function
Specify which antenna port to use for reception. Choose either 'TX/RX' or 'RX2'
subdev.select_rx_antenna(which_antenna)
which_antenna: either 'TX/RX' or 'RX2'
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

i_and_q_swapped ()
Sub Function
Return True if this is a quadrature device and ADC 0 is Q.
subdev.i_and_q_swapped()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP source instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

1.38.2) db_wbx_lo_tx ()
Type
Description
Usage
Parameters

Page 195 of 208

Function
Handlers for db_wbx_lo_tx dboard
db_wbx. db_wbx_lo_tx (usrp,which)
usrp: instance of usrp source

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which: which side: 0 or 1 corresponding to side A or side B respectively
Examples
Note

1.38.2.1)
Type
Description
Usage
Parameters
Examples
Note

1.38.2.2)
Type
Description
Usage
Parameters
Examples
Note

1.38.2.3)
Type
Description
Usage
Parameters
Examples
Note

Board Technical specifications :
Min gain : -56 dB
Max gain :0 dB
Gain steps : .1dB
Min frequency : 50e06 Hz
Max frequency : 1000 e06 Hz
Frequency Step : 16e03 Hz

dbid ()
Sub Function
Return db_wbx_lo_tx daughter board ID
subdev.dbid()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

name ()
Sub Function
Return db_wbx_lo_tx daughter board name
subdev.name()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

side_and_name ()
Sub Function
Return db_wbx_lo_tx daughter board side and name
subdev.side_and_name()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

Simple Gnuradio User Manual

1.38.2.4)
Type
Description
Usage
Parameters
Examples
Note

1.38.2.5)
Type
Description

Usage
Parameters
Examples
Note

1.38.2.6)
Type
Description

Usage
Parameters
Examples
Note

Page 197 of 208

freq_range ()
Sub Function
Return range of frequencies in Hz that can be tuned by this db_wbx_lo_tx d'board.
Returns (min_freq, max_freq, step_size), return type tuple.
subdev.freq_range()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_freq ()
Sub Function
Set the frequency of db_wbx_lo_tx.
Returns (ok, actual_baseband_freq)
where:
ok :bool True or False and indicates success or failure,
actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
subdev.set_freq(target_freq)
target_freq: target RF frequency in Hz
type freq: float
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

is_quadrature ()
Sub Function
Return True if this db_wbx_lo_tx daughterboard does quadrature up or down
conversion. That is, return True if this board requires both I & Q analog channels.
For this board, return True
subdev.is_quadrature()

subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

Simple Gnuradio User Manual

1.38.2.7)

set_auto_tr ()

Type
Description
Usage
Parameters
Examples
Note

1.38.2.8)

Page 198 of 208

Sub Function
Enable automatic Transmit/Receive switching (ATR).
subdev.set_auto_tr(on)
on : bool True or False
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

set_enable ()

Type
Description
Usage
Parameters
Examples
Note

Sub Function
Enable /Disable RF Transmitter
subdev.set_enable(on)
on : bool True or False
subdev is the flexrf daughterboard and can be get by :
subdev = usrp.selected_subdev(u, subdev_spec)
where :
u : is the USRP sink instance.
subdev_spec: is the tuple (side, subdev), where side is 0 (Side A) or 1 (Side B) and
subdev is 0 (Input I) or 1 (input Q)

2) usrpm package
Description

2.1) usrpm/usrp_dbid.py
Type
Description

Python file
This file contains all USRP daughter boards ID’s invented yet. These are :
BASIC_TX
= 0x0000
BASIC_RX
= 0x0001
DBS_RX
= 0x0002
TV_RX
= 0x0003
FLEX_400_RX
= 0x0004
FLEX_900_RX
= 0x0005
FLEX_1200_RX = 0x0006
FLEX_2400_RX = 0x0007
FLEX_400_TX
= 0x0008
FLEX_900_TX
= 0x0009
FLEX_1200_TX = 0x000a
FLEX_2400_TX = 0x000b
TV_RX_REV_2
= 0x000c
DBS_RX_REV_2_1 = 0x000d

Simple Gnuradio User Manual

LF_TX
= 0x000e
LF_RX
= 0x000f
FLEX_400_RX_MIMO_A = 0x0014
FLEX_900_RX_MIMO_A = 0x0015
FLEX_1200_RX_MIMO_A = 0x0016
FLEX_2400_RX_MIMO_A = 0x0017
FLEX_400_TX_MIMO_A = 0x0018
FLEX_900_TX_MIMO_A = 0x0019
FLEX_1200_TX_MIMO_A = 0x001a
FLEX_2400_TX_MIMO_A = 0x001b
FLEX_400_RX_MIMO_B = 0x0024
FLEX_900_RX_MIMO_B = 0x0025
FLEX_1200_RX_MIMO_B = 0x0026
FLEX_2400_RX_MIMO_B = 0x0027
FLEX_400_TX_MIMO_B = 0x0028
FLEX_900_TX_MIMO_B = 0x0029
FLEX_1200_TX_MIMO_B = 0x002a
FLEX_2400_TX_MIMO_B = 0x002b
FLEX_1800_RX = 0x0030
FLEX_1800_TX = 0x0031
FLEX_1800_RX_MIMO_A = 0x0032
FLEX_1800_TX_MIMO_A = 0x0033
FLEX_1800_RX_MIMO_B = 0x0034
FLEX_1800_TX_MIMO_B = 0x0035
TV_RX_REV_3
= 0x0040
WBX_LO_TX
= 0x0050
WBX_LO_RX
= 0x0051
EXPERIMENTAL_TX = 0xfffe
EXPERIMENTAL_RX = 0xffff
Note

2.2) usrpm/usrp_prims.py
Type
Description
Note

Python file
This file was automatically generated by SWIG

2.3) usrpm/usrp_fpga_regs.py
Type
Description

Python file
This file contains all USRP fpga registers. These are :
FR_TX_SAMPLE_RATE_DIV
FR_RX_SAMPLE_RATE_DIV
FR_MASTER_CTRL
bmFR_MC_ENABLE_TX
bmFR_MC_ENABLE_RX
bmFR_MC_RESET_TX
bmFR_MC_RESET_RX
FR_OE_0
FR_OE_1
FR_OE_2
FR_OE_3
FR_IO_0
FR_IO_1
FR_IO_2
FR_IO_3

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FR_MODE
bmFR_MODE_NORMAL
bmFR_MODE_LOOPBACK
bmFR_MODE_RX_COUNTING
bmFR_MODE_RX_COUNTING_32BIT
FR_DEBUG_EN
bmFR_DEBUG_EN_TX_A
bmFR_DEBUG_EN_RX_A
bmFR_DEBUG_EN_TX_B
bmFR_DEBUG_EN_RX_B
FR_DC_OFFSET_CL_EN
FR_ADC_OFFSET_0
FR_ADC_OFFSET_1
FR_ADC_OFFSET_2
FR_ADC_OFFSET_3
FR_ATR_MASK_0
FR_ATR_TXVAL_0
FR_ATR_RXVAL_0
FR_ATR_MASK_1
FR_ATR_TXVAL_1
FR_ATR_RXVAL_1
FR_ATR_MASK_2
FR_ATR_TXVAL_2
FR_ATR_RXVAL_2
FR_ATR_MASK_3
FR_ATR_TXVAL_3
FR_ATR_RXVAL_3
FR_ATR_TX_DELAY
FR_ATR_RX_DELAY
FR_INTERP_RATE
FR_DECIM_RATE
FR_RX_FREQ_0
FR_RX_FREQ_1
FR_RX_FREQ_2
FR_RX_FREQ_3
FR_RX_MUX
FR_TX_MUX
FR_TX_A_REFCLK
FR_RX_A_REFCLK
FR_TX_B_REFCLK
FR_RX_B_REFCLK
bmFR_REFCLK_EN
bmFR_REFCLK_DIVISOR_MASK
FR_RX_PHASE_0
FR_RX_PHASE_1
FR_RX_PHASE_2
FR_RX_PHASE_3
FR_TX_FORMAT
bmFR_TX_FORMAT_16_IQ
FR_RX_FORMAT
bmFR_RX_FORMAT_SHIFT_MASK
bmFR_RX_FORMAT_SHIFT_SHIFT
bmFR_RX_FORMAT_WIDTH_MASK
bmFR_RX_FORMAT_WIDTH_SHIFT
bmFR_RX_FORMAT_WANT_Q
bmFR_RX_FORMAT_BYPASS_HB
FR_USER_0
FR_USER_1
FR_USER_2
FR_USER_3
FR_USER_4
FR_USER_5
FR_USER_6
FR_USER_7

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Simple Gnuradio User Manual

FR_USER_8
FR_USER_9
FR_USER_10
FR_USER_11
FR_USER_12
FR_USER_13
FR_USER_14
FR_USER_15
FR_USER_16
FR_USER_17
FR_USER_18
FR_USER_19
FR_USER_20
FR_USER_21
FR_USER_22
FR_USER_23
FR_USER_24
FR_USER_25
FR_USER_26
FR_USER_27
FR_USER_28
FR_USER_29
FR_USER_30
FR_USER_31
FR_RX_MASTER_SLAVE
bmFR_RX_SYNC
bmFR_RX_SYNC_MASTER
bmFR_RX_SYNC_SLAVE
bmFR_RX_SYNC_INPUT_IOPIN
bmFR_RX_SYNC_OUTPUT_IOPIN
FR_RB_IO_RX_A_IO_TX_A
FR_RB_IO_RX_B_IO_TX_B
FR_RB_CAPS
bmFR_RB_CAPS_NDDC_MASK
bmFR_RB_CAPS_NDDC_SHIFT
bmFR_RB_CAPS_RX_HAS_HALFBAND
bmFR_RB_CAPS_NDUC_MASK
bmFR_RB_CAPS_NDUC_SHIFT
bmFR_RB_CAPS_TX_HAS_HALFBAND
Note

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Index
A
adaptive_fir_ccf...................................................................................................................................................................................77
add_const_vxx ....................................................................................................................................................................................80
add_const_xx.......................................................................................................................................................................................80
add_vxx .................................................................................................................................................................................................79
add_xx ...................................................................................................................................................................................................79
agc_xx..................................................................................................................................................................................................107
align_on_samplenumbers_ss........................................................................................................................................................102
am_demod_cf ................................................................................................................................................................................19, 42
analysis_filterbank .......................................................................................................................................................................25, 48
argmax_xx ............................................................................................................................................................................................80

B
bartlett..................................................................................................................................................................................................127
basic_block ..........................................................................................................................................................................................87
bin_statistics_f ..................................................................................................................................................................................126
binary_slicer_fb.................................................................................................................................................................................122
blackman2...........................................................................................................................................................................................127
blackman3...........................................................................................................................................................................................128
blackman4...........................................................................................................................................................................................128
blackmanharris..................................................................................................................................................................................128
block.......................................................................................................................................................................................................87
block_detail ..........................................................................................................................................................................................87
buffer......................................................................................................................................................................................................86
buffer_reader .......................................................................................................................................................................................86
bytes_to_syms ..................................................................................................................................................................................101

C
calc_dxc_freq.....................................................................................................................................................................................145
channel_model ..............................................................................................................................................................................20, 42
char_to_float ......................................................................................................................................................................................100
check_counting_s...............................................................................................................................................................................98
check_crc32 .........................................................................................................................................................................................70
check_lfsr_32k_s ................................................................................................................................................................................98
chunks_to_symbols _xx ...................................................................................................................................................................80
clock_recovery_mm_xx ..................................................................................................................................................................113
cma_equalizer_cc ...............................................................................................................................................................................77
complex_to_arg.................................................................................................................................................................................103
complex_to_float ..............................................................................................................................................................................102
complex_to_imag..............................................................................................................................................................................102
complex_to_interleaved_short......................................................................................................................................................103
complex_to_mag...............................................................................................................................................................................102
complex_to_mag_squared .............................................................................................................................................................103
complex_to_real................................................................................................................................................................................102
conjugate_cc......................................................................................................................................................................................112
constellation_decoder_cb ..............................................................................................................................................................122
constellation_sink...............................................................................................................................................................................63
conv_1_0_string_to_packed_binary_string.......................................................................................................................136, 138
conv_packed_binary_string_to_1_0_string.......................................................................................................................135, 138
converter_rate............................................................................................................................................................................150, 161
correlate_access_code_bb ............................................................................................................................................................122
costas_loop_cc .................................................................................................................................................................................120
cpm_mod ........................................................................................................................................................................................20, 43
ctcss_squelch_ff...............................................................................................................................................................................125
cvsd_decode........................................................................................................................................................................................41
cvsd_encode........................................................................................................................................................................................41

D
d8psk_demod ................................................................................................................................................................................21, 44
d8psk_mod .....................................................................................................................................................................................21, 44
daughterboard_id .....................................................................................................................................................................151, 163

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db_basic_rx........................................................................................................................................................................................174
db_basic_tx ........................................................................................................................................................................................172
db_dbs_rx ...........................................................................................................................................................................................180
db_flexrf_xxxx_rx .............................................................................................................................................................................185
db_flexrf_xxxx_rx_mimo_x ............................................................................................................................................................185
db_flexrf_xxxx_tx..............................................................................................................................................................................182
db_flexrf_xxxx_tx_mimo_x ............................................................................................................................................................182
db_lf_rx................................................................................................................................................................................................176
db_lf_tx................................................................................................................................................................................................178
db_tv_rx ..............................................................................................................................................................................................190
db_wbx_lo_rx.....................................................................................................................................................................................192
db_wbx_lo_tx.....................................................................................................................................................................................195
dbid................................................................................................................................172, 174, 176, 178, 180, 183, 186, 190, 192, 196
dbpsk_demod ................................................................................................................................................................................23, 45
dbpsk_mod.....................................................................................................................................................................................22, 45
dd_mpsk_sync_cc............................................................................................................................................................................113
decim_rate ..........................................................................................................................................................................................150
decode_bs ............................................................................................................................................................................................68
decode_ps ............................................................................................................................................................................................67
deinterleave........................................................................................................................................................................................106
delay.....................................................................................................................................................................................................107
demod_10k0a3e_cf.......................................................................................................................................................................19, 42
demod_200kf3e_cf........................................................................................................................................................................26, 49
demod_20k0f3e_cf........................................................................................................................................................................26, 49
demod_pkts....................................................................................................................................................................................33, 54
design_filter ...................................................................................................................................................................................39, 59
determine_rx_mux_value................................................................................................................................................................144
determine_tx_mux_value................................................................................................................................................................145
diff_decoder_bb ................................................................................................................................................................................123
diff_encoder_bb ................................................................................................................................................................................123
diff_phasor_cc...................................................................................................................................................................................122
dispatcher .............................................................................................................................................................................................89
divide_xx...............................................................................................................................................................................................81
dpll_bb.................................................................................................................................................................................................114
dqpsk_demod ................................................................................................................................................................................24, 46
dqpsk_mod.....................................................................................................................................................................................23, 46

E
enable_realtime_scheduling ............................................................................................................................................................91
encode_sb ............................................................................................................................................................................................68
encode_sp ............................................................................................................................................................................................67
error_handler .......................................................................................................................................................................................89
exponential .........................................................................................................................................................................................128

F
fake_channel_decoder_pp .............................................................................................................................................................109
fake_channel_encoder_pp .............................................................................................................................................................109
feedforward_agc_cc.........................................................................................................................................................................125
feval ......................................................................................................................................................................................................123
feval_xx ...............................................................................................................................................................................................124
fft _filter_xx...........................................................................................................................................................................................76
fft_sink_x.........................................................................................................................................................................................61, 62
fft_vcc ....................................................................................................................................................................................................99
fft_vfc .....................................................................................................................................................................................................99
file_descriptor_sink............................................................................................................................................................................94
file_descriptor_source.......................................................................................................................................................................94
file_error_handler ...............................................................................................................................................................................90
file_sink .................................................................................................................................................................................................93
file_sink_base......................................................................................................................................................................................93
file_source ............................................................................................................................................................................................93
filter_delay_fc ......................................................................................................................................................................................76
fir_filter_xxx .........................................................................................................................................................................................77
firdes.band_pass ..............................................................................................................................................................................104
firdes.band_reject.............................................................................................................................................................................105
firdes.complex_band_pass ............................................................................................................................................................104
firdes.gaussian ..................................................................................................................................................................................106
firdes.high_pass................................................................................................................................................................................104
firdes.hilbert .......................................................................................................................................................................................105

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firdes.low_pass .................................................................................................................................................................................103
firdes.root_raised_cosine...............................................................................................................................................................105
firdes.window.....................................................................................................................................................................................106
flex_demod ...........................................................................................................................................................................................68
float_to_complex ................................................................................................................................................................................98
float_to_short.....................................................................................................................................................................................100
float_to_uchar....................................................................................................................................................................................100
fm_deemph.....................................................................................................................................................................................27, 49
fm_demod_cf .................................................................................................................................................................................26, 48
fm_preemph ...................................................................................................................................................................................27, 50
format...................................................................................................................................................................................................155
format_bypass_halfband ................................................................................................................................................................156
format_shift ........................................................................................................................................................................................156
format_want_q...................................................................................................................................................................................156
format_width ......................................................................................................................................................................................156
fpga_master_clock_freq..........................................................................................................................................................150, 161
fractional_interpolator_xx ................................................................................................................................................................76
framer_sink_1 ....................................................................................................................................................................................123
freq_range....................................................................................................................173, 175, 177, 179, 181, 184, 187, 191, 193, 197
freq_xlating_fir_filter_xxx.................................................................................................................................................................78
frequency_modulator_fc.................................................................................................................................................................101
freqz........................................................................................................................................................................................................70
fsm........................................................................................................................................................................................................130

G
gain_range.................................................................................................................................. 173, 175, 177, 179, 181, 188, 191, 194
gen_and_append_crc32....................................................................................................................................................................70
get_master_source_c ......................................................................................................................................................................169
get_master_usrp ...............................................................................................................................................................................169
get_slave_source_c .........................................................................................................................................................................170
get_slave_usrp ..................................................................................................................................................................................169
glfsr_source_x...................................................................................................................................................................................126
gmsk_demod .................................................................................................................................................................................29, 51
gmsk_mod ......................................................................................................................................................................................28, 51
gnuplot_freqz.......................................................................................................................................................................................71
goertzel_fc ............................................................................................................................................................................................77
gri_agc_xx ..........................................................................................................................................................................................107
gri_agc2_xx ........................................................................................................................................................................................108

H
hamming .............................................................................................................................................................................................126
hanning................................................................................................................................................................................................127
has_rx_halfband................................................................................................................................................................................143
has_tx_halfband................................................................................................................................................................................144
head........................................................................................................................................................................................................97
hexint .....................................................................................................................................................................................................72
hier_block2 ...........................................................................................................................................................................................88
high_pass ...........................................................................................................................................................................................137
hilbert_fc ...............................................................................................................................................................................................76

I
i_and_q_swapped.....................................................................................................................................................................189, 195
iir_filter_ffd ...........................................................................................................................................................................................75
interleave.............................................................................................................................................................................................106
interleaved_short_to_complex......................................................................................................................................................103
interleaver ...........................................................................................................................................................................................131
interp_fir_filter_xxx ............................................................................................................................................................................78
interp_rate...........................................................................................................................................................................................162
io_signature .........................................................................................................................................................................................86
is_quadrature..............................................................................................................173, 176, 178, 180, 182, 185, 188, 191, 194, 197

K
kaiser....................................................................................................................................................................................................129
keep_one_in_n ....................................................................................................................................................................................99
kludge_copy.......................................................................................................................................................................................121

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L
lfsr_32k_source_s ..............................................................................................................................................................................98
list_revers .............................................................................................................................................................................................72
lms_dfe_xx .........................................................................................................................................................................................114
lmx2306 .................................................................................................................................................................................................72
low_pass .............................................................................................................................................................................................137

M
make_format ......................................................................................................................................................................................155
make_packet ..............................................................................................................................................................................136, 138
map_bb................................................................................................................................................................................................123
max_xx ..................................................................................................................................................................................................82
message ................................................................................................................................................................................................88
message_from_string........................................................................................................................................................................88
message_handler................................................................................................................................................................................89
message_sink......................................................................................................................................................................................95
message_source.................................................................................................................................................................................95
microtune_4702_eval_board............................................................................................................................................................94
microtune_4937_eval_board............................................................................................................................................................94
microtune_xxxx_eval_board............................................................................................................................................................94
mod_pkts ........................................................................................................................................................................................33, 54
mpsk_receiver_cc.............................................................................................................................................................................109
msg_queue ...........................................................................................................................................................................................89
multi_source_align...........................................................................................................................................................................169
multiply_const_vxx ............................................................................................................................................................................83
multiply_const_xx...............................................................................................................................................................................82
multiply_vxx .........................................................................................................................................................................................82
multiply_xx ...........................................................................................................................................................................................82
mute_xx.................................................................................................................................................................................................83
mux...............................................................................................................................................................................................151, 162

N
name..............................................................................................................................172, 174, 176, 178, 180, 183, 186, 190, 193, 196
nbfm_rx ...........................................................................................................................................................................................29, 52
nbfm_tx............................................................................................................................................................................................30, 52
nchannels ...................................................................................................................................................................................151, 162
nddcs ...................................................................................................................................................................................................143
nducs ...................................................................................................................................................................................................144
nlog10_ff .............................................................................................................................................................................................109
noise_source_x ...................................................................................................................................................................................83
nop..........................................................................................................................................................................................................96
npadding_bytes.........................................................................................................................................................................137, 139
null_sink................................................................................................................................................................................................97
null_source...........................................................................................................................................................................................97
num_to_str .........................................................................................................................................................................................140
number_sink_x ..............................................................................................................................................................................63, 64
nuttall ...................................................................................................................................................................................................128

O
ofdm_ mapper_bcv...........................................................................................................................................................................118
ofdm_bpsk_demapper.....................................................................................................................................................................118
ofdm_bpsk_mapper .........................................................................................................................................................................117
ofdm_correlator.................................................................................................................................................................................117
ofdm_cyclic_prefixer .......................................................................................................................................................................117
ofdm_demod ..................................................................................................................................................................................31, 53
ofdm_frame_sink ..............................................................................................................................................................................119
ofdm_insert_preamble.....................................................................................................................................................................119
ofdm_mod.......................................................................................................................................................................................30, 53
ofdm_qam_mapper...........................................................................................................................................................................118
ofdm_qpsk_mapper .........................................................................................................................................................................118
ofdm_receiver ......................................................................................................................................................................................32
ofdm_sampler....................................................................................................................................................................................119
ofdm_sync_fixed.................................................................................................................................................................................31
ofdm_sync_ml .....................................................................................................................................................................................31
ofdm_sync_pn .....................................................................................................................................................................................32
ofdm_sync_pnac.................................................................................................................................................................................32

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os_read_exactly ..................................................................................................................................................................................73
oscope_sink_f......................................................................................................................................................................................95

P
pa_2x2_phase_combiner ................................................................................................................................................................120
packed_to_unpacked _xx .................................................................................................................................................................81
packet_sink ........................................................................................................................................................................................114
parzen ..................................................................................................................................................................................................127
peak_detector_xb ...............................................................................................................................................................................83
pga................................................................................................................................................................................................149, 160
pga_db_per_step ......................................................................................................................................................................150, 161
pga_max......................................................................................................................................................................................150, 161
pga_min.......................................................................................................................................................................................149, 161
phase_modulator_fc ........................................................................................................................................................................101
pick_ subdev......................................................................................................................................................................................146
pick_rx_subdevice............................................................................................................................................................................146
pick_tx_subdevice............................................................................................................................................................................146
pll_carriertracking_cc......................................................................................................................................................................115
pll_freqdet_cf .....................................................................................................................................................................................115
pll_refout_cc ......................................................................................................................................................................................115
pn_correlator_cc...............................................................................................................................................................................116
ppio.........................................................................................................................................................................................................95
prefs .....................................................................................................................................................................................................121
print_db_info......................................................................................................................................................................................170
probe_avg_mag_sqrd_xx ...............................................................................................................................................................116
probe_signal_f...................................................................................................................................................................................116
pwr_squelch_xx ................................................................................................................................................................................124

Q
qam16_demod ...............................................................................................................................................................................36, 56
qam16_mod....................................................................................................................................................................................35, 56
qam256_demod .............................................................................................................................................................................38, 58
qam256_mod..................................................................................................................................................................................37, 58
qam64_demod ...............................................................................................................................................................................37, 57
qam64_mod....................................................................................................................................................................................36, 57
qam8_demod .................................................................................................................................................................................34, 55
qam8_mod ......................................................................................................................................................................................34, 55
quadrature_demod_cf .......................................................................................................................................................................97

R
ra_fft_sink_x...................................................................................................................................................................................65, 66
radar .....................................................................................................................................................................................................135
radar_rx ...............................................................................................................................................................................................135
radar_tx ...............................................................................................................................................................................................135
rational_resampler........................................................................................................................................................................38, 59
rational_resampler_base_xxx..........................................................................................................................................................79
read_9862....................................................................................................................................................................................157, 167
read_aux_dac.............................................................................................................................................................................152, 163
read_eeprom ..............................................................................................................................................................................152, 164
read_fpga_reg............................................................................................................................................................................157, 166
read_i2c.......................................................................................................................................................................................153, 164
read_io.........................................................................................................................................................................................154, 166
read_spi.......................................................................................................................................................................................158, 168
regenerate_bb....................................................................................................................................................................................120
riemann................................................................................................................................................................................................128
rms_xx .................................................................................................................................................................................................108
rx_freq..................................................................................................................................................................................................151

S
sample_and_hold_xx .........................................................................................................................................................................84
scope_sink_x .................................................................................................................................................................................62, 63
sdr_1000................................................................................................................................................................................................73
sdr_1000_base.....................................................................................................................................................................................95
select_rx_antenna ....................................................................................................................................................................189, 195
selected_subdev ...............................................................................................................................................................................145
serial_number............................................................................................................................................................................154, 165

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set_adc_buffer_bypass ...........................................................................................................................................................153, 165
set_adc_offset ...........................................................................................................................................................................153, 164
set_auto_tr.................................................................................................................................................................. 185, 188, 195, 198
set_bw..................................................................................................................................................................................................182
set_dac_offset ...........................................................................................................................................................................153, 164
set_dc_offset_cl_enable .................................................................................................................................................................155
set_ddc_phase ..................................................................................................................................................................................148
set_decim_rate ..................................................................................................................................................................................147
set_enable...................................................................................................................................................................................185, 198
set_format...........................................................................................................................................................................................155
set_fpga_mode ..................................................................................................................................................................................149
set_freq.........................................................................................................................173, 175, 177, 179, 181, 184, 187, 191, 193, 197
set_gain....................................................................................................................................... 173, 175, 177, 179, 182, 188, 191, 194
set_gain_all_rx ..................................................................................................................................................................................171
set_interp_rate...................................................................................................................................................................................159
set_mux.......................................................................................................................................................................................148, 159
set_nchannels............................................................................................................................................................................148, 159
set_pga ........................................................................................................................................................................................149, 160
set_rx_freq..........................................................................................................................................................................................148
set_tx_freq..........................................................................................................................................................................................160
set_verbose................................................................................................................................................................................149, 160
short_ to_float....................................................................................................................................................................................100
side_and_name ..........................................................................................................172, 174, 176, 179, 181, 184, 187, 190, 193, 196
sig_source_x........................................................................................................................................................................................84
simple_correlator..............................................................................................................................................................................101
simple_framer....................................................................................................................................................................................101
simple_sequelch_cc.........................................................................................................................................................................107
single_pole_iir_filter_xx....................................................................................................................................................................76
single_threaded_scheduler..............................................................................................................................................................88
sink .......................................................................................................................................................................................................142
sink_s...................................................................................................................................................................................................130
sink_uc ................................................................................................................................................................................................130
sink_x...........................................................................................................................................................................................143, 158
skiphead................................................................................................................................................................................................97
sounder ...............................................................................................................................................................................................134
sounder_rx .........................................................................................................................................................................................134
sounder_tx..........................................................................................................................................................................................134
source ..................................................................................................................................................................................................141
source_x......................................................................................................................................................................................142, 147
squelch_base_xx ..............................................................................................................................................................................124
standard_squelch .........................................................................................................................................................................39, 60
str_to_num .........................................................................................................................................................................................141
stream_mux........................................................................................................................................................................................111
stream_to_streams...........................................................................................................................................................................111
stream_to_vector ........................................................................................................................................................................99, 111
streams_to_stream...........................................................................................................................................................................111
streams_to_vector............................................................................................................................................................................111
stripchar_sink_x..................................................................................................................................................................................67
sub_xx ...................................................................................................................................................................................................85
sync ......................................................................................................................................................................................................170
sync_block ...........................................................................................................................................................................................90
sync_decimator...................................................................................................................................................................................90
sync_interpolator................................................................................................................................................................................90
synthesis_filterbank.....................................................................................................................................................................25, 47

T
tcp_connect_or_die............................................................................................................................................................................74
test........................................................................................................................................................................................................121
threshold_ff ........................................................................................................................................................................................112
throttle .................................................................................................................................................................................................109
top_block ..............................................................................................................................................................................................90
trellis_encoder_xx ............................................................................................................................................................................131
trellis_metrics_x................................................................................................................................................................................132
trellis_permutation ...........................................................................................................................................................................131
trellis_siso_f.......................................................................................................................................................................................131
trellis_viterbi_combined_xx...........................................................................................................................................................132
trellis_viterbi_x ..................................................................................................................................................................................132
tune...............................................................................................................................................................................................142, 143
tune_all_rx ..........................................................................................................................................................................................170
tune_result..........................................................................................................................................................................................145

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tx_freq..................................................................................................................................................................................................162
type_1_demods .................................................................................................................................................................................139
type_1_mods......................................................................................................................................................................................139

U
uchar_to_float....................................................................................................................................................................................100
udp_connect_or_die ..........................................................................................................................................................................74
udp_sink................................................................................................................................................................................................96
udp_source...........................................................................................................................................................................................96
unmake_packet .........................................................................................................................................................................136, 138
unpack_k_bits_bb.............................................................................................................................................................................121
unpacked_to_packed _xx .................................................................................................................................................................81

V
vco_f.....................................................................................................................................................................................................112
vector_sink_x.......................................................................................................................................................................................85
vector_source_x..................................................................................................................................................................................85
vector_to_ streams...........................................................................................................................................................................112
vector_to_stream ........................................................................................................................................................................99, 112
video_sdl_sink_s ..............................................................................................................................................................................129
video_sdl_sink_uc............................................................................................................................................................................129

W
waterfall_sink_x ............................................................................................................................................................................64, 66
welch ....................................................................................................................................................................................................127
wfm_rcv...........................................................................................................................................................................................40, 60
wfm_rcv_pll ....................................................................................................................................................................................40, 61
wfm_tx .............................................................................................................................................................................................40, 61
write_9862...................................................................................................................................................................................157, 167
write_aux_dac............................................................................................................................................................................151, 163
write_eeprom .............................................................................................................................................................................152, 163
write_fpga_reg...........................................................................................................................................................................156, 166
write_fpga_reg_masked..........................................................................................................................................................157, 166
write_i2c ......................................................................................................................................................................................152, 164
write_io ........................................................................................................................................................................................154, 165
write_oe.......................................................................................................................................................................................154, 165
write_spi......................................................................................................................................................................................158, 167
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