Mercurial > ~darius > hgwebdir.cgi > pyinst
view example.py @ 6:85dfc0babc36
Add basic RSIB parser and example program.
There are still a few questions about this stuff..
author | Daniel O'Connor <darius@dons.net.au> |
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date | Sat, 16 May 2009 23:30:59 +0930 |
parents | 51d1fc44a753 |
children | 813e183cfd49 |
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#!/usr/bin/env python import usb488 import matplotlib.pylab as pylab import numpy import time def main(): u = usb488.USB488Device() print "Found device" u.write("*IDN?") print "IDN reports " + u.read() u.write("DATA:ENC RIB") # Big endian signed u.write("DATA:WIDTH 2") # 2 bytes wide u.write("SELECT:CH1 ON") # Turn channel 1 on u.write("DATA:SOURCE CH1") # Set the curve source to channel 1 u.write("CURVE?") # Ask for the curve data then = time.time() result = u.read(1.0) # Takes the CRO a while for this now = time.time() print "CURVE read took %f milliseconds" % ((now - then) * 1000.0) data = result[13:] # Chop off the header dattype = numpy.dtype('>h') # Big endian 16 bit quantity ary = numpy.fromstring(data, dtype = dattype) pylab.plot(ary) pylab.show() if __name__ == "__main__": main()