Mercurial > ~darius > hgwebdir.cgi > pyinst
diff example.py @ 64:4ca9fdf0795a
Add simple scope example
author | Daniel O'Connor <doconnor@gsoft.com.au> |
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date | Fri, 08 Jan 2021 14:10:24 +1030 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/example.py Fri Jan 08 14:10:24 2021 +1030 @@ -0,0 +1,67 @@ +#!/usr/bin/env python + +# Copyright (c) 2009 +# Daniel O'Connor <darius@dons.net.au>. All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. +# + +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("CH1:SCALE?") + vscale = float(u.read(1).split()[1]) + print("Channel 1 scale is %.2f volts/div" % (vscale)) + u.write("HOR:MAIN:SCALE?") + hscale = float(u.read(1).split()[1]) + print("Horizontal scale is %f sec/div" % (hscale)) + + u.write("*WAI") # Make sure the previous commands have been + # executed + 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 (should verify this really..) + dattype = numpy.dtype('>h') # Big endian 16 bit quantity + ary = numpy.fromstring(data, dtype = dattype) + ary = ary / 32768.0 * vscale + pylab.plot(ary) + pylab.show() + +if __name__ == "__main__": + main()