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README 2012-05-29 5.4 kB 11 weekly downloads
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This is the OpenGPIB library, written from scratch by rickyrockrat (gpib at rickyrockrat dot com). What is amazing is that most of it works and actually produces useful data. There are other efforts out there but none that really supported Linux. Notable sites such as http://www.ke5fx.com (Windows only) and http://www.ko4bb.com/ (RF site) should be referenced. There was some attempt to write a wrapper for the graphics library for the GPIB Toolkit the ke5fx offers, however it would have taken a lot of testing using a Windows box, and I have very little patience with Windows these days. Besides, I had to get some work done (i.e. data out of my test equipment). The web page is http://opengpib.sourceforge.net. All the tools should accept -h for a usage page. Here are some useful invocations of the tools: Network Analyzer /networkanalyzer -a s9 -a a18 -d s/dev/ttyUSB0 -d a/dev/ttyUSB1 -f s1 -f e2000 -i 1000 -m c -l s10 -f f -c cablecal10.cal Signal generator on /dev/ttyUSB0, address 9, Analyzer on /dev/ttyUSB1, address 18 Start frequency 1Mhz, end frequency 2000Mhz, increment of 1000kHz, mode is calibration, level is 10dbm The -f f sets a follow mode (see usage). Extract a 1655x waveform: Get the trace. ./get_hp_16555_waveform -d /dev/ttyUSB2 -t foo.dat Get the configuration: ./get_hp_16555_waveform -d /dev/ttyUSB2 -c foo.cfg Parse the trace file into a format la2vcd can use: ./parse_16500_config -d foo.dat -f foo.la Convert the trace to a vcd: la2vcd -td 2ns -r 16 -b 32 -sf 31 CLK -sf 29-24 RED -sf 11 STVD -sf 10 STVU -sf 9 CLKV -sf 7 OE -sf 5 LD -sf 3 POL -sf 1 DIO2 -sf 0 DIO1 foo.la -o foo.vcd Extract a Tek 2440 waveform (extracts to base.ch1 base.ch2 base.cursors): ./get_tek_waveform -a 9 -c ch1 -c ch2 -c cursors -d /dev/ttyUSB1 -o base Manipulate and display the tek data: tek2gplot This will add additional plots using a function. Available functions as of 0.1 are: diff max-y min-y pk-pk see makepng for an invocation that will generate a png. Leave terminal type off for and Xwindow. This has only been tested on a 64-bit Linux operating system, and only 2 controllers are supported thus far. It's prettty easy to write new controller interfaces. Look at hp16500ip.c/h or prologixs.c/h (device implemntation) and gpib.c/h. You add the open, read, write, close, and control function implementation, then the define for the new controller, and it should "just work". Here are the steps to adding another controller: 1) The functions in the dev implementation need to be duplicated (hp16500ip.c/h or prologixs.c/h). 2) The interface type needs to be added to the enum in gpib.h (GPIB_CTL_*). 3) Add the entry in the table at the top of gpib.c (supported_dev). 4) Add the entry to the case in open_gpib. See get_hp_16555_waveform.c to see how the option works from the table in supported_dev. There are 2 functions that work on this table, one displays supported controllers, the other validates the option and returns the device type. Have now added get_hp_1653xx_scope, which talks to hp16530,16532,and 16534 scope cards. The setup with 2 '32 cards in master-slave and 2 '34 cards in master-slave works, and I am able to match the data between the '32 and the '34 cards, which gives me an 8-channel o-scope. I am using an external trigger from a tek positive-hi TTL signal using a simple TTL-ECL converter like so: GND | C | IN---+---||----R100-+-B-PNP | C104 | | R50 R1K--+---OUT | GND Where R50=50 ohm, R100=100ohm and R1K is 1k ohm PNP is MMBT4401, and C104 is .1uF cap. BFQ19/BFS17A/BFR93A can also be used. Delay is around 60-70nS OUT is tied to the inputs of both master cards. These connectors are SMB microwave connectors, and I managed to find some SMB jumpers on ebay for $5 USD. REALLY useful scripts: ********** setup_16532 *************** ex - save setup - automatically appends -cardtype.set to the file name. setup_16532 -s 13 -s 14 -g my_settings_file -restore setup setup_16532 -s 13 -s 14 -p my_settings_file - load a config file on the HP16500, then setup the settings (in this case, the channel skew file - saved earlier): setup_16532 -l 14PSKEW -s 13 -s 14 -p my_settings_file ************* get_hp_plot ************* - grab the data from both the 14 and 13 card types, put the data in base filenames 'mybase', set the gnuplot output type to x11, both grab the data and plot it, and - add the title 'mytitle' to the plot: get_hp_plot -t 14 -t 13 -b "mybase" -k x11 -m all -p "-t mytitle" This generates (with 2 '32 cards and 2 '34 cards) mybase-13.ch1,ch2,ch3,ch4, mybase-14.ch1,ch2,ch3,ch4, and mybase.plot. If you set the type to -k png, it will also generated mybase.png. If you change -m all to -m plot, it will only plot the files, not grab them from the HP16500 again. This is useful in conjunction with -k x11 to validate the plot before dumping it to png. the -p "-z optz -y opty" sends the commands to plot-file, which is the one actually doing the plotting. if you specify, for example -p "-x 5:7 -t mytitle", you will put 'mytitle' at the top of the graph, and limit the x range to between 5 and 7, useful for zooming in and out on the plot. Feel free to e mail me at g p i b a t rickyrockrat d o t n e t.
Source: README, updated 2012-05-29