Delta Electronics orporated PH8-P GSM/GPRS/UMTS/HSPA Module User Manual 5 Swich

Delta Electronics Incorporated GSM/GPRS/UMTS/HSPA Module 5 Swich

User Manual

DNI Smart Grid Data Collector SGDC-D22 User Manual Rev. 1.9 2017/01/19 Notice: 1. Delta Networks Inc. reserves the right to change specifications detailed in this document at any time without notice, and assumes no responsibility for any errors within this document. 2. This document contains proprietary technical information in which is the property of the Delta Networks Inc. and shall not be disclosed to others in whole or in part, reproduced, copied, or used as the basis for design, manufacturing, or sale of apparatus without written permission of Delta Networks Inc.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. i Table of Contents 1. Introduction ............................................................................................................................................................ 1 1.1. GENERAL DESCRIPTION ................................................................................................................................................... 1 1.2. TARGET APPLICATIONS .................................................................................................................................................... 1 1.3. PRODUCT INFORMATION .................................................................................................................................................. 1 1.4. REGULATION DECLARATION ............................................................................................................................................. 2 2. Platform Description ............................................................................................................................................... 3 2.1. HARDWARE INFORMATION ............................................................................................................................................... 3 2.2. SOFTWARE INFORMATION ................................................................................................................................................ 5 3. Tool Chain Installation ............................................................................................................................................ 7 3.1. ENVIRONMENT................................................................................................................................................................. 7 3.2. INSTALLING STLINUX ON UBUNTU .................................................................................................................................. 7 3.3. ADD TOOL CHAIN PATH ................................................................................................................................................... 8 4. Getting Started ........................................................................................................................................................ 9 4.1. CONNECT TO PC .............................................................................................................................................................. 9 4.2. SIM CARD AND SD CARD INSTALLATION .......................................................................................................................11 4.3. LOGIN DATA COLLECTOR ............................................................................................................................................... 12 5. The First Program ................................................................................................................................................. 14 5.1. COMPILE HELLOWORLD.C .............................................................................................................................................. 14 5.2. SEND FILES TO DATA COLLECTOR .................................................................................................................................. 14 5.3. EXECUTE PROGRAM AT DATA COLLECTOR ..................................................................................................................... 14 6. Communication Settings ........................................................................................................................................ 15 6.1. STATIC IP ON ETH0 ......................................................................................................................................................... 15 6.2. DHCPD AND DHCP CLIENT ......................................................................................................................................... 15 6.3. 3G ................................................................................................................................................................................. 16 6.4. PPPOE OVER ETH0 ......................................................................................................................................................... 17 7. Daemons & Utilities............................................................................................................................................... 20 7.1. RAMDISK ....................................................................................................................................................................... 20 7.2. NFS (NETWORK FILE SYSTEM) ..................................................................................................................................... 21 7.3. TELNET & SSH SERVICE ................................................................................................................................................ 22
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. ii 7.4. FTP & SCP .................................................................................................................................................................... 24 7.5. HTTP ............................................................................................................................................................................ 25 7.6. NTP & RTC ................................................................................................................................................................... 27 7.7. SSL ............................................................................................................................................................................... 28 7.8. SENDMAIL VIA SMTP .................................................................................................................................................... 29 8. I/O Control ............................................................................................................................................................ 30 8.1. DATA COLLECTOR ID ..................................................................................................................................................... 30 8.2. SYSTEM READY LED ..................................................................................................................................................... 30 8.3. BUZZER ......................................................................................................................................................................... 30 8.4. RESET BUTTON .............................................................................................................................................................. 30 8.5. RS-232 & RS-485 ......................................................................................................................................................... 30 8.6. SD CARD ....................................................................................................................................................................... 31 8.7. COMBINE WDT INTO YOUR PROGRAM .......................................................................................................................... 31 9. Linux Kernel Upgrade & Backup .......................................................................................................................... 33 10. Reference .............................................................................................................................................................. 35
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. iii Revision History Version Date Author Description 1.0 2012/5/9 DNI SG Team  Initial Release. 1.1 2012/5/23 DNI SG Team  Add Linux Kernel Upgrade & Backup section. 1.2 2012/6/4 DNI SG Team  Add & modify sections below - Communication Settings - Daemons & Utilities - I/O Control 1.3 2012/10/12 DNI SG Team  Modify some configurations. 1.4 2013/11/29 DNI SG Team  Add SIM & SD card installation. 1.5 2014/4/29 DNI SG Team  Add ZigBee feature for SGDC-D23. 1.6 2014/11/4 DNI SG Team  Add SGDC-D24. 1.7 2016/9/2 Jacky Lai  Update to standard format  Remove 2G(GPRS) for certification 1.8 2017/1/5 Jacky Lai  Added FCC description in 1.4 1.9 2017/1/19 Jacky Lai  Added RF Exposure, 2.1091description in 1.4
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 1 1. Introduction 1.1. General Description DNI data collector SGDC-D22 is a 3G version ARM9 based embedded system with 3G for WAN communication and Ethernet port, RS-232 and RS-422/485 interfaces for LAN communication as well to collect data from devices via LAN communication and forward to data center via WAN communication. The communication capability can fulfill the requirements in smart metering and distributed energy monitoring applications as well as the sensor network and internet of things applications. Figure 1, DNI data collector applications. 1.2. Target Applications DNI data collector is an embedded system designed for smart grid applications as well as the IoT related applications. 1.3. Product Information Model Name Description SGDC-D22 Data collector with 3G communication board.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 2 1.4. Regulation declaration The changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. To comply with the FCC RF exposure compliance requirements, this device and its antenna must not be co-located or operating to conjunction with any other antenna or transmitter. Note: This equipment has been tested and found to comply with the limits for a Class B Digital Device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction, may cause harmful interference to radio communication. However, there is no grantee that interference will not occur in a particular installation. If this equipment dose cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: --Reorient or relocate the receiving antenna. --Increase the separation between the equipment and receiver. --Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. --Consult the dealer or an experienced radio/TV technician for help. This device should have at least 20 cm separation distance to persons.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 3 2. Platform Description 2.1. Hardware Information DNI data collector incorporates the following hardware components as shown in Figure 2. Figure 2, DNI data collector hardware components. Feature Description Main Board With CPU, memory and major interfaces of data collector. 3G Daughter Board With 3G module and LED indicators. CPU ST SPEAr 320S Flash 32MB (16MB  2) DDR-II 64MB 3G Module1 3G: (model name: SGDC-D22)  Five band: UMTS/HSPA+ 1900MHz  HSPA 3GPP Release 6, 7  UMTS 3GPP release 4  Output power: - Class 3 (+24dBm +1/-3dB) for UMTS 1900,WCDMA FDD BdII
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 4 The interfaces of data collector are illustrated as following table. Interface Description Note Power A 3-pin terminal block to connect 12-48VDC V+, V and GND. Reset Button Hardware reset button. Support back to factory default setting function. Ethernet Port RJ45 port for Ethernet connection. Antenna External antenna with SMA connector. Console Port Local port for direct connecting to concentrator (RJ45 connector). Wall Mount 2 L shape parts for wall mount installation. RS-232 Male DB9 connector for RS-232 connection. PIN 2: RXD PIN 3: TXD PIN 5: GND RS-422/485 Female DB9 connector for RS-422/485 connection. Support switching RS-485 or RS-422 modes by software. Please find the pin define in separate table. GPIO 2x5-pin digital I/O for applications. PIN 1: GND PIN 2: GND PIN 3: DI3 PIN 4: DO3 PIN 5: DI2 PIN 6: DO2 PIN 7: DI1 PIN 8: DO1 PIN 9: DI0 PIN 10: DO0
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 5 Interface Description Note SIM Card & SD Card Slots1 RS-485 pin define: Serial Port Device Name Software Switch Command Hardware PIN Definition RS-485 (2-wire) /dev/ttyM1 setport 1 PIN 1: GND PIN 2: DATA(A) PIN 3: DATA(B)+ RS-422 (4-wire) /dev/ttyM1 setport 0 PIN 1: GND PIN 2: RX PIN 3: RX+ PIN 4: TX+ PIN 5: TX LED display: Feature Description Note Power Power indicator Turn on when power on. Ready Get the system ready information and turn on the ready LED when data collector connect to data center and get response from communication server. Turn on when connect to data center. RS-232 TxD × 1, RxD × 1 Blink when communication. RS-485 TxD × 1, RxD × 1 Blink when communication. 3G 3G connection indicator. Turn on when 3G connected. 3G Signal Strength1 5 levels for ZigBee signal strength indicators. LAN10 / LAN100 2 for 10/100Mbps speed indicators Blink when communication. 2.2. Software Information Software Package STLinux 2.3 or above Operation System Linux kernel 2.6.37 or above
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 6 Utilities Busybox 1.19.3 File System type Jffs2 Toolchain Gcc v4.2.4, Glibc v2.6.1, GDB v6.3
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 7 3. Tool Chain Installation 3.1. Environment  Host OS: Ubuntu 10.04  STLinux image file: STLinux-2.3-spear-20091209.iso http://ftp.stlinux.com/pub/stlinux/2.3/iso/ 3.2. Installing STLinux on Ubuntu Please refer to the installation guide at http://www.stlinux.com/faq?q=node/361. Installation steps:  Make /bin/sh bash  Installing RPM on Ubuntu  Populating the RPM databases with "Provides" Download “STLinux_deps” rpm file at http://www.stlinux.com/sites/default/files/stlinux23-host-STLinux_deps-0.1-5.i386.rpm then install it.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 8  Install STLinux Mount image file “STLinux-2.3-spear-20091209.iso” then install it. After installation completed, STLinux package would be place at /opt/STM/STLinux-2.3/. 3.3. Add Tool Chain Path  Add tool chain path at ~/.bashrc then re-login.  Test tool chain
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 9 4. Getting Started 4.1. Connect to PC DNI data collector provides two interfaces for PC to login, configure and maintenance. Users can connect to a PC through a serial console port (RS-232) or by using SSH utility over the network connection. This section will describe how to connect DNI data collector to PC through these two interfaces. 4.1.1. Serial Console Port (RS-232) When using the serial console port to connect, first, make sure the console cable is correctly connected between DNI data collector and a host PC. Then open a serial port terminal emulator (e.g. Hyper Terminal or PuTTY) and fill the port settings as shown in the following table. Baud Rate 115200 bps Parity None Data Bits 8 Stop Bit 1 Flow Control None Figure 3, Hyper Terminal Com Port Properties.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 10 Figure 4, PuTTY Configuration for Serial Connection. 4.1.2. SSH Utility (Network) By default, DNI data collector enables the SSH service to support remote log in. The default network IP of DNI data collector is 192.168.1.100. Please also make sure that the IP used by PC is also in the 192.168.1.x subnet. The network cable can be connected directly between a PC and a DNI data collector. Figure 5, PuTTY Configuration for SSH Connection.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 11 4.2. SIM Card and SD Card Installation The SIM card and SD card slots are behind the left side cover gate of the SGDC-D22. Please refer to the following picture and instructions to install SIM card and SD card. 1. Open the cover gate by rotating the screw in anti-clockwise way. 2. Insert the SIM card and SD card into the slot in correct direction. (The unfilled corner is on the right side.) 3. Close the cover gate by rotating the screw in clockwise direction, and be sure the gate is closed when the device is power-on. Figure 6, SIM card and SD card installation
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 12 4.3. Login Data Collector Once the connection (either serial or SSH) is established, a prompt for login will be shown in the window. The default account for log in is root. The default password for root is ‘dnidni’. First time to log in through SSH, some terminal emulator may show alerts that the host key is unknown, please accept it and continue the log in procedure. Figure 7, Data collector Log In Example Output (Serial). Figure 8, Putty Security Alert.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 13 Figure 9, Data collector Log In Example Output (SSH).
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 14 5. The First Program 5.1. Compile helloworld.c Use cross compiler at host to compile the program for data collector. Use “file” command to check the program after compiling. # arm-linux-gcc helloworld.c -o helloworld # file helloworld Result: 5.2. Send Files to Data Collector Use “scp” command at host to send the file to data collector. # scp helloworld root@192.168.1.10:/var Result: 5.3. Execute Program at Data Collector Execute the program at the data collector. Result:
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 15 6. Communication Settings 6.1. Static IP on eth0 To set the static IP for DCU in eth0, please edit /etc/network/interfaces # vi /etc/network/interfaces auto eth0 iface eth0 inet static address 192.168.1.100 network 192.168.1.0 netmask 255.255.255.0 broadcast 192.168.1.255 gateway 192.168.1.254 And you can apply this configuration by executing the following command: # set-static-ip 6.2. DHCPD and DHCP Client DCU can act as a DHCP server to assign IP to the client in the same network. Enable DHCPD: # udhcpd Edit the /etc/udhcpd.conf if needed. # vi /etc/udhcpd.conf start 192.168.1.20 end 192.168.1.99 interface eth0 opt router 192.168.1.254 option subnet 255.255.255.0 option lease 600 # 10min opt dns 168.95.1.1 168.95.192.1 #static_lease 00:13:96:03:a7:ed 192.168.1.30 #static_lease 00:13:96:03:a5:f0 192.168.1.31 DCU also can act as a DHCP client to get IP configuration from DHCP server. # dhcpip
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 16 To act as dhcp server or client on booting, it can be configured in /etc/rc.d/rc.local. 6.3. 3G Before using 3G communication, please insert a SIM card into the slot on the 3G module. The position of the SIM slot and the direction of SIM card please refer to the section 4.2. DNI data collector uses pppd to handle the 3G connection. 3G service providers have their own setting such as APN and dial number. Please contact the provider to get the correct values. The APN value is defined in /etc/ppp/ppp-on-dialer. And the dial number is in /usr/sbin/3g-connect. Figure 10, Change APN.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 17 Figure 11, Change Dial Number. After confirm the APN and the dial number, use the following command to connect a 3G service. # 3g-connect You also can get RSSI value and reflash the signal strength led status by using the following command. # get-rssi-ber To get imsi code, use the command below. # getimsi Use the command below to disconnect the 3G service. # 3g-disconnect 6.4. PPPoE over eth0 To access Internet via the service form your ISP, e.g. ADSL, you can use PPPoE to connect to your ISP. Before using PPPoE, you need to request your ISP to setup an ADSL modem in your house and get some information, e.g. username and password, which is needed on setting your connection.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 18 When ADSL modem is ready to use, please use Ethernet cable to connect DCU and ADSL modem and execute the following command to connect to your ISP. First, you need to setup the parameters for the PPPoE connection. # pppoe-setup Please answer the following questions: >>> Enter your PPPoE user name: your_username >>> Enter the Ethernet interface connected to the DSL modem: (default eth0): eth0 >>> Enter the demand value (default no): no >>> Enter the DNS information here: server (Please enter a specific DNS server IP when ISP has provided it to you.) >>> Please enter your PPPoE password: your_password >>> Choose a type of firewall (0-2): 0 >>> Accept these settings and adjust configuration files (y/n)? y After setting up parameters, use the following command to conect to the remote server: # pppoe-start When the connection is built up, there will be a message “… Connected! ” on the console. Figure 12, Connect and disconnect with PPPoE.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 19 When you want to disconnect, use the following command to disconnect the PPPoE connection. # pppoe-stop
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 20 7. Daemons & Utilities 7.1. Ramdisk To mount a virtual disk on the memory, you can execute the following command to create a ramdisk. Create a directory for ramdisk: # mkdir –p /var/ramdisk Allocate a specific memory size and mount it to the ramdisk: # mount –t tmpfs none /var/ramdisk –o size=16M Finally, you can use df command to check the information of the ramdisk you created. # df Figure 13, Mount a ramdisk with 16MB size. If you want to umount the ramdisk, use the command below: # umount /var/ramdisk
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 21 7.2. NFS (Network File System) Before using NFS, a NFS server is needed. To create a NFS server on your PC, please refer to: Linux: http://tldp.org/HOWTO/NFS-HOWTO/server.html Windows: http://sourceforge.net/projects/freenfs/ When your NFS server is ready, please execute the following commands to connect to your NFS server. Create a directory for NFS: # mkdir -p /mnt/nfs Mount NFS server directory to your local directory: # mount -t nfs -o nolock server_IP:/directory /mnt/nfs Finally, you can use df command to check the information of NFS directory you mounted. # df Figure 14, Mount a remote directory to the local one via NFS. If you want to disconnect and umount from the NFS server, use the command below: # umount /mnt/nfs
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 22 7.3. Telnet & SSH Service Telnet and SSH can be used to remote login to the DCU. SSH uses encryption transportation, and the transportation on Telnet is only by ACSII code. You can turn on those services on the /etc/inetd.conf to make them as auto-run daemon after booting. # vi /etc/inetd.conf ftp stream tcp nowait root /usr/local/sbin/pure-ftpd pure-ftpd -H & telnet stream tcp nowait root /usr/sbin/telnetd telnetd -i ssh stream tcp nowait root /usr/bin/dropbear dropbear -i #www stream tcp nowait root /usr/sbin/httpd httpd -i -h /home/htdocs The default port of telnet service will be port 23. The default port of SSH service will be port 22. You can use PuTTY or other terminal programs to login DCU via those protocols. Figure 15, Use Putty to create a telnet or SSH connection.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 23 There will be a notification to user to update the key on your PC, when SSH protocol is used. Press “Yes” to allow this operation. Figure 16, Notification for key updating. Figure 17, Login to the DCU via telnet or SSH. Default username/password: root/dnidni After login, you can operate the DCU remotely.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 24 7.4. FTP & SCP FTP and SCP can be used for file transmission to the DCU. Ftp is the normal way to transmit file on the internet, and SCP is a file transmission way on the SSH protocol. You can turn on those services on the /etc/inetd.conf to make them as auto-run daemon after booting. # vi /etc/inetd.conf ftp stream tcp nowait root /usr/local/sbin/pure-ftpd pure-ftpd -H & telnet stream tcp nowait root /usr/sbin/telnetd telnetd -i ssh stream tcp nowait root /usr/bin/dropbear dropbear -i #www stream tcp nowait root /usr/sbin/httpd httpd -i -h /home/htdocs The default port of ftp service will be port 21. SCP: SCP can be used correctly when SSHd is turned on. FTP/SCP client on PC: FTP: http://filezilla-project.org/download.php SCP: http://winscp.net/ FTP/SCP client on DCU FTP: # ftpget –u username –p password HOST_IP [LOCAL_FILE] REMOTE_FILE # ftpput –u username –p password HOST_IP REMOTE_FILE [LOCAL_FILE] SCP: # scp root@HOST_IP:/REMOTE_FILE LOCAL_FILE # scp LOCAL_FILE root@HOST_IP:/REMOTE_FILE
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 25 7.5. HTTP DCU can act as a simple HTTP WEB server, and you can follow the command below to build up your own web server. Create a folder for WEB server and create a homepage. # mkdir –p /home/htdocs # echo "<html><body><h1>It works!</h1></body></html>" >> /home/htdocs/index.html You can turn on those services on the /etc/inetd.conf to make them as auto-run daemon after booting. # vi /etc/inetd.conf ftp stream tcp nowait root /usr/local/sbin/pure-ftpd pure-ftpd -H & telnet stream tcp nowait root /usr/sbin/telnetd telnetd -i ssh stream tcp nowait root /usr/bin/dropbear dropbear -i www stream tcp nowait root /usr/sbin/httpd httpd -i -h /home/htdocs Figure 18, Create a simple web server.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 26 You can use browser to show the page you created if the httpd is running well. Figure 19, Web page from Http server.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 27 7.6. NTP & RTC NTP protocol is used to synchronize the time between DCU and the time server. You need to find a NTP server and use the following command to adjust the time on DCU. # ntpdate <ntpserver_ip> If there is no NTP server that DCU can reach, you can also adjust Linux system time manually. # date MMDDhhmmYYYY After adjusting Linux system time, you need to save the correct time to the HW RTC. Please execute the following command to save time to RTC. # hwclock -w –u Figure 20, Time synchronization with ntp server and write back to the RTC.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 28 7.7. SSL OpenSSL is used to encrypt and decrypt on different algorithm for different purpose. You can use the command to check what kind of command and algorithm are supported. # openssl –h Figure 21, OpenSSL commands and algorithms supported.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 29 7.8. Sendmail via SMTP Sendmail is used to send a mail via SMTP protocol, the following command is an example to send a mail from DCU to Gmail SMTP server, and Gmail SMTP server will help you to send the mail to the receiver’s mail server. Use vi to create an example mail: # vi /var/mailtest Subject: This is a mail test CC: xxxx@gmail.com To: yyyy@gmail.com From: zzzz@gmail.com This is a test After editing the test mail content, please use the following command to send it out. (Noted: make sure that the DCU can access Internet.) # sendmail -f zzzz@gmail.com -v -H 'openssl s_client -connect smtp.gmail.com:465 -quiet' -auUSERNANE -apPASSWORD < /var/mailtest
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 30 8. I/O Control 8.1. Data Collector ID To get DCU id, execute the following command. # getuid 8.2. System Ready LED To get turn on or turn off the ready led, execute the following command. # sysrd-led-on # sysrd-led-off 8.3. Buzzer To control the buzzer, execute the following command with the unit in millisecond. # buzzer <msec> 8.4. Reset Button The action of the reset button is programmable. The default action is: < 5 seconds: Reset the device. > 5 seconds: Recovery to the default settings. 8.5. RS-232 & RS-485 RS-232 port is mapped to the Linux device /dev/ttyM0, and RS485 is /dev/ttyM1. RS-485 can support 2-wire and 4-wire mode, you need to select the correct mode before you use it. To select the RS-485 mode, execute the following command. 2-wire mode: # setport 1 4-wire mode: # setport 0
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 31 8.6. SD Card SD card is designed to be mounted automatically. When a SD card is inserted into the SD card slot, there will be directory on /var/sd. The mount point will be removed when the SD card is removed. 8.7. Combine WDT Into Your Program DNI data collector provides a watchdog timer which has a 32- bit down counter with a programmable timeout value. On timeout it generates an interrupt and reset signal. The WDT is intended to be used to generate a system reset if a software failure (or a system hang) occurs. The WDT driver provides a set of ioctls to the user. Through this interface user can configure, program and refresh the WDT. The device node of WDT is /dev/watchdog. The following code snippets demonstrate how to use the WDT. To open the WDT interface: char wdt_dev[] = "/dev/watchdog" int fd; fd = open(wdt_dev, O_RDWR); if (fd < 0) { printf("Error in opening device\n"); } To control the WDT and set the timeout as 45 seconds: int ret = 0; int timeleft=0; struct watchdog_info ident; int timeout = 45; /* in seconds */ /* to find out supported options in watchdog */ ret = ioctl(fd, WDIOC_GETSUPPORT, &ident); /* to set time out */ ioctl(fd, WDIOC_SETTIMEOUT, &timeout); /* to find out how much time is left before reset */ ret = ioctl(fd, WDIOC_GETTIMEOUT, &timeleft); /* Refresh watchdog timer at every 10 secs to prevent reset */ while (1) { ioctl(fd, WDIOC,KEEPALIVE, 0); sleep(10); }
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 32 The WDT interface IOCTL options: IOCTL Code Usages WDIOC_GETSUPPORT The fields returned in the ident structure are: identity: A string identifying the watchdog driver firmware_version: the firmware version of the card if available. options: A flags describing what the device supports. WDIOC_KEEPALIVE This ioctl does exactly the same thing as a write to the watchdog device and hence refreshes the timer WDIOC_SETTIMEOUT Set time out in seconds, after which reset would be generated (if WDT is not refreshed) WDIOC_GETTIMEOUT Query the current timeout
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 33 9. Linux Kernel Upgrade & Backup Upgrade: Use FTP or SCP to put your kernel image into the device directory /var and execute the following command on the device to upgrade the kernel image. # flashcp –v /var/<imagename> /dev/mtd3 Figure 22, Upgrade Linux kernel image. When it is done, please reboot your device to apply the kernel image you upgraded. Backup: Execute the following command to backup the current kernel image on the device to the /var directory. # dd if=/dev/mtd3 of=/var/kernel.img
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 34 Figure 23, Backup Linux kernel image from DCU. When it is done, you can restore the kernel.img via FTP or SCP to your remote computer.
Doc #: 1ANSU-160004 DNI SGDC-D22 User Manual i. 35 10. Reference  ST Microelectronics: http://www.st.com/internet/com/home/home.jsp  NXP: http://www.nxp.com/#/homepage

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