Ocean Optics SeaBreeze Sea Breeze Manual Core

User Manual:

Open the PDF directly: View PDF .
Page Count: 7

Download
Open PDF In Browser	View PDF

Ocean Optics SeaBreeze

1

Introduction

SeaBreeze is a simplified device driver intended for use with Ocean Optics spectrometers
and other devices. This document describes SeaBreeze and compares it to other Ocean
Optics device drivers. Note that SeaBreeze is not a spectral math library and provides
only limited spectral correction or manipulation. SeaBreeze is intended for use by
experienced C/C++ programmers and may not be suitable for all audiences. It is
provided as a starting point for developers that would otherwise have to create an
equivalent device interface themselves because OmniDriver is too large or complex for
their application. SeaBreeze does not support every Ocean Optics device, feature, or
target platform at this time, but it is extensible so other developers can add required
enhancements themselves.
This archive is provided as-is, without any warranty, express or implied. Use the
enclosed files at your own risk. Ocean Optics is not obliged to provide any support for
these files or any notification of defects. These files are not licensed for further
redistribution, but resulting or derived compiled products or libraries may be freely
distributed. Some included files (in the windows-support directory) are copyrighted
by and licensed from Microsoft (as part of redistribution of the DDK) and can be
redistributed according to Microsoft’s license. Any use of the files in this archive implies
understanding of and agreement with these terms.
The remainder of this document is organized as follows. Section 2 presents the design
goals for SeaBreeze and an overview of the software architecture that was created to meet
these requirements. Section 3 provides a comparison of SeaBreeze to OmniDriver.
Section 4 describes how to use the SeaBreeze distribution. Section 5 discusses known
limitations.

2

Design Goals and Architecture

SeaBreeze was designed to address specific limitations of existing driver products. The
general principles that guided the design to avoid these limitations are provided below.
 SeaBreeze should be small. Prior Ocean Optics drivers required a Java Virtual
Machine (JVM) to operate, which when installed would require 40-70MiB of disk
space and significant memory when executed. SeaBreeze is implemented in C++
which does not require a special runtime on most platforms, and can be built into
a library that is smaller than 700KiB. As a result, SeaBreeze is suitable for
embedded platforms. Where source code is available, developers can also remove
functionality they do not require to further reduce the code size.
 SeaBreeze should be fast. OmniDriver is complex, and on some computers, does
not easily reach the fastest cycle time of some Ocean Optics spectrometers.
SeaBreeze is intended to have minimal overhead between requesting and reading
out data.











2.1

SeaBreeze should be flexible. Ocean Optics devices communicate via USB,
Ethernet, RS232, and other buses. SeaBreeze was designed to communicate with
devices using different protocols and buses. This is accomplished by allowing
any number of protocols and buses to be defined for a particular device, and
letting the combination of these to be determined at run-time.
SeaBreeze should be extensible. SeaBreeze is designed and organized such that
support for new features within existing devices can be added easily, and new
devices that do not resemble anything already supported can also be added
without difficulty or conflict.
SeaBreeze should be portable. Most of the code in SeaBreeze is generic C++,
and where it interfaces to a specific computer bus, an abstract bus interface is
used. SeaBreeze can be ported to new platforms simply by providing a native
implementation of the bus interfaces for the target.
SeaBreeze should provide uniform support for all aspects of a device. In prior
device drivers, the device was assumed to be a spectrometer with some other
related functionality (e.g. thermo-electric cooler, GPIO). In SeaBreeze, devices
are treated simply as a collection of features, which may or may not include a
spectrometer. This provides a more uniform interface to these features.
SeaBreeze should be designed for and used by experienced C/C++ developers
only. OmniDriver and OOIWinIP provide numerous language interfaces (e.g.
LabVIEW, Visual Basic) that require very little programming experience to use.
No such language interfaces are planned for SeaBreeze, though calling functions
in a SeaBreeze library (e.g. DLL) may be possible from other languages.
SeaBreeze is intended for use by experienced programmers that are proficient
with object oriented programming, exception handling, threading, and other
modern programming language features.

Architectural Overview

SeaBreeze provides four layers of abstraction between application code and the device
being controlled: device, feature, protocol, and bus. Each layer deals with different kinds
of information and has different responsibilities. Data and control always move between
these layers in a consistent manner. The provided SeaBreezeWrapper API provides
access to the device layer in a simplified manner, and operating system functionality may
reside below the bus layer. The relationship between these layers and the rest of the
system is as follows:

User Application
API

Simplified interface between SeaBreeze and user
application

Device

Representation of a physical device; a collection of
usable features

Feature

A single device capability, such as TEC, EEPROM,
spectrometer, strobe/lamp enable, GPIO

Protocol

A command set or encoding of parameters and data
necessary to interact with a specific device feature

Bus

Representation of a hardware bus capable of sending
and/or receiving arbitrary bit or byte sequences

Operating System

Low-level control of hardware to accomplish data
transfers

A separate document containing a detailed UML description of the architecture should
accompany this introduction.

3

Comparison to Other Drivers

SeaBreeze is not intended to be a universal replacement for OmniDriver or its
predecessor, OOIWinIP (OOIDrv32.DLL). SeaBreeze and OmniDriver address different
needs. The following table provides a side-by-side comparison of these drivers to
illustrate where each is best used.
Attribute
Required resources

Language interfaces
Device support

OmniDriver
Requires a Java Runtime
Environment (JRE) which
is typically 40+ MiB on
disk and has a memory
overhead when executed
Java, C, C++, Delphi,
Visual Basic, C#,
LabVIEW
All Ocean Optics USB
spectrometers

SeaBreeze
Links to the C++ runtime
that is available on most
operating systems. Can be
compiled into a library that
is less than 700KiB.
C/C++
No support for discount
spectrometers, e.g. RedTide
or Amadeus; only most
popular devices supported

Device feature support

Every major feature of
Ocean Optics USB devices
is supported

Operating system support

Windows 98, ME, 2000,
XP, Vista, and 7 (32- and
64-bit), Linux (32-bit and
64-bit), MacOSX 10.3-10.5
(PPC and Intel)
Application developers or
novice programmers
Workstations

Audience
Target platforms

4

Only the most commonly
used device features are
supported to minimize total
code size
Windows XP, Vista, and 7
(32-bit and 64-bit), Linux,
MacOSX; extensible to
other platforms
OEMs and system
integrators
Embedded systems

Installation and Use

SeaBreeze currently supports three development environments: Linux, Windows, and
MacOSX. Each of these has specific requirements that are described below. A sample
program has been provided for each operating system that illustrates the use of an API
class, SeaBreezeWrapper. This API should be used if possible as it will greatly
simplify the process of acquiring data from Ocean Optics spectrometers as compared to
calling the underlying classes directly. SeaBreezeWrapper also provides a working
example of how to use the rest of the architecture if needed.

4.1

Linux

SeaBreeze requires the libusb library to be installed on the development system,
including the header files (e.g. usb.h). Most modern Linux distributions provide a
suitable version of this library. A typical compiler toolchain (g++, ld, ar, make) is
required. Running make in the top-level directory should be sufficient to build
libseabreeze.so which can then be linked against by a user application. The toplevel Makefile can be modified to disable debugging symbols and enable optimization
(e.g. remove the –ggdb3 flag and add –O2 from the CFLAGS). This should be done
prior to redistribution of the compiled library as it will improve performance and reduce
its size. Note that the Makefile does not always detect when dependencies have
changed, to it may be necessary to delete libseabreeze.so prior to running make
each time to ensure a proper result.
A test program is located in test/seabreeze_test_linux.c that should connect
to a supported device and acquire data. This will be built along with
libseabreeze.so above. Note that if errors are displayed indicating that a device
cannot be claimed, it is likely that the user does not have sufficient privileges. Running
the program as root is one solution, or a udev script can be installed if the Linux
system uses udev to detect newly connected devices. A sample udev script (linuxsupport/10-oceanoptics.rules) has been included and should be placed in or
around /etc/udev/rules.d as appropriate.

4.2

Windows

SeaBreeze communicates with USB devices in Windows using the WinUSB API
provided by Microsoft. This API is supported by default in Windows Vista and
Windows 7, both 32-bit and 64-bit, though user approval of the driver may be required.
Windows XP can also use the WinUSB API if it is installed. Note that there may be a
conflict between the .INF files required to use an Ocean Optics device with WinUSB and
the .INF files formerly used by Ocean Optics software to communicate via USB (the
ezusb.sys and ooiusb.inf files). Only one of these may be used on a system at a
time. It is expected that WinUSB will be used for future support of Windows, and
ezusb.sys will be phased out. Support for ezusb.sys in SeaBreeze is possible but
not currently available.
The windows-support directory contains .INF files for each of the supported Ocean
Optics devices (and some that are not), and “CoInstaller” bundles for 32-bit and 64-bit
systems. These files are required when first connecting the spectrometer to the system.
The recommended way to install the driver is to get to the Windows Device Manager and
to reinstall or update the driver. If the user browses to this windows-support
directory to find the .INF file, then the rest of the files should be found automatically.
Note that if existing Ocean Optics driver files (e.g. ooiusb.inf and ezusb.sys) are
found on the system, there may be a conflict. Windows seems to give these older drivers
priority, so it may be necessary to remove (or rename) them completely prior to using the
included drivers. The enclosed drivers should appear with “(WinUSB)” in the name
when presented by the device manager, which should help to identify them.
To develop with SeaBreeze in Windows, the latest Windows DDK is required. This can
be downloaded for free from Microsoft (once an account is created) and is provided with
an MSDN subscription. The DDK version used to develop Windows support for
SeaBreeze was 6001.18001. To set up a Visual Studio project to use this DDK, it is
necessary to specify the following include directories within the DDK installation:
 inc\ddk
 inc\api
The following external library (.lib) files must also be specified:
 winusb.lib
 setupapi.lib
The library directory must also be specified. The correct setting depends on the build
target. For 32-bit targets, these are probably located in the following directory relative to
the DDK:
 lib\wxp\i386
For 64-bit targets, these are probably located in the following directory relative to the
DDK:
 lib\wlh\amd64
Note that some files provided with the SeaBreeze distribution are intended for Linux and
will not compile with Visual Studio. In particular, the NativeUSB.c file in
src\native\usb\linux should not be included in any Visual Studio project as

many of its included header files (e.g. usb.h) are not available in Windows. Further,
the test program test\seabreeze_test_linux.c contains Linux-only code and
will not compile under Visual Studio.
The sample program, seabreeze_test_windows.c, illustrates how to do simple
spectrometer control and data acquisition. This has been tested using Visual Studio 2005
on a Windows Vista 32-bit operating system set up as described above. This is not
intended to be a comprehensive demonstration program, but should show how to use the
SeaBreezeWrapper API as a starting point.

4.3

MacOSX

SeaBreeze communicates with USB devices in OSX through the IOKit framework. As a
result, no extra system files are necessary. The OSX driver has been tested using Snow
Leopard but it should work for any version of OSX (Intel or PPC). No steps have been
taken to make a universal binary out of the dynamic library yet, so any attempt to make a
single executable that will work in both Intel and PPC, 32-bit and 64-bit may require
some changes to the compiler and linker settings.
To build SeaBreeze for OSX, it is sufficient to run make in the top-level directory of the
source tree provided that gcc has been installed and is in the path. It should be possible
to compile this in XCode, but no project for XCode is provided. Linux and OSX both
use the same Makefiles to build SeaBreeze, and make will determine what to do for
each. As with the Linux build (see Section 4.1 above), it may be desirable to remove
debugging (-ggdb3 flag) and add optimization (-O2 flag) to CFLAGS prior to a release.
When built, a program called seabreeze_test_macosx will be created in the test
directory. This will attempt to open connected devices and perform some simple
interactions with them.
Additional operating systems can be supported provided that native interfaces for the
required communication buses are created. The existing native interfaces can be found in
the native directories in the top-level src and include directories.

4.4

Organization

The source code for SeaBreeze is laid out as follows. There are two top-level directories,
include and src, that both have the same organization (shown below). Header (.h)
files are located in the include directory tree, and all other files (e.g. .cpp) are located
in the src tree. Within these directories, files are organized as follows:
 api
(simplified interface for applications to use)
 common
(base classes, macros, and general definitions)
o buses
(abstract definitions of the bus layer)
o devices
(abstract definitions of the device layer)
o exceptions
(C++ exception types that may be thrown)
o features
(abstract definitions of the feature layer)




5

o protocols
native
vendors
o OceanOptics
 …

(abstract definitions of the protocol layer)
(bus interface implementations for target platforms)
(device-specific definitions)
(definitions for Ocean Optics devices)
(classes derived from those in common)

Limitations

SeaBreeze is a relatively new project and it may contain coding errors. Source code is
provided so that any such errors can quickly be resolved by the developer. Device and
feature support is also limited. The following Ocean Optics USB spectrometers are
supported by SeaBreeze at present:
 HR2000, HR2000+, HR4000, USB2000, USB2000+, USB4000, Maya2000,
MayaPro2000, QE65000, NIRQuest 256, NIRQuest 512, STS
For these devices, SeaBreeze can do the following:
 Set integration time
 Acquire and decode a spectrum
 Set strobe/lamp enable state
 Read EEPROM slots, including serial number
 Compute wavelengths for spectrometer pixels based on calibration stored in
EEPROM
 Enable/disable thermoelectric cooler on equipped spectrometers, set target
temperature, read current detector temperature in degrees Celsius, and read out
the default settings for these parameters
 Set trigger mode
 For some spectrometers, read an irradiance calibration from the device
At present, SeaBreeze does not perform any spectral corrections, such as electric dark
correction, boxcar smoothing, multi-scan averaging, linearity correction, or stray light
correction. Since source code is provided, required functionality can be added as needed.
Sample code that will do linearity and electric dark correction is provided in the test
directory, but is above the level of the API.



---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.5
Linearized                      : No
Page Count                      : 7
Create Date                     : 2011:06:13 13:42:50-04:00
Modify Date                     : 2011:06:13 13:42:50-04:00
Title                           : Ocean Optics SeaBreeze
Author                          : Aaron Gage
Creator                         : Nitro PDF Word Add-in
Producer                        : BCL easyPDF 6.00 (0320)

EXIF Metadata provided by EXIF.tools