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annotate logpps.py @ 62:ffc9292eb00b

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Use edge detection to log time differences between edges
author Daniel O'Connor <doconnor@gsoft.com.au>
date Fri, 08 Jan 2021 14:06:52 +1030
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children 7386f2888508
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62
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2021
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4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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5 #
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6 # Redistribution and use in source and binary forms, with or without
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7 # modification, are permitted provided that the following conditions
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8 # are met:
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9 # 1. Redistributions of source code must retain the above copyright
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10 # notice, this list of conditions and the following disclaimer.
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11 # 2. Redistributions in binary form must reproduce the above copyright
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12 # notice, this list of conditions and the following disclaimer in the
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13 # documentation and/or other materials provided with the distribution.
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14 #
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15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 # SUCH DAMAGE.
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26 #
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27 # Expected DB schema
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28 # CREATE TABLE ppslog (
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29 # name TEXT,
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30 # time TIMESTAMP WITH TIME ZONE,
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31 # delta NUMERIC(15, 12)
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32 # );
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33
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34 import datetime
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35 import matplotlib.pylab as pylab
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36 import numpy
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37 import psycopg2
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38 #import sqlite3
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39 import sys
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40 import time
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41 # Should try this code instead: https://github.com/python-ivi/python-usbtmc
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42 import usb488
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43
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44 def main():
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45 u = usb488.USB488Device()
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46 print('Found device')
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47
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48 # See "TDS2000 Programmer.pdf"
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49 res = u.ask('*IDN?')
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50 print('IDN reports ' + res)
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51
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52 #dbh = sqlite3.connect('logpps.db')
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53 dbh = psycopg2.connect('host=vm11 user=ppslog dbname=ppslog')
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54 test(u, dbh, 'ncu-iono2-tx')
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55
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56 def test(u, dbh = None, name = None):
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57 if dbh != None:
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58 cur = dbh.cursor()
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59
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60 u.write('ACQ:MODE SAMPLE')
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61 u.write('ACQ:STATE STOP')
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62
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63 #u.write('DATA:ENC RIB') # Big endian signed
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64 #u.write('DATA:WIDTH 2') # 2 bytes wide
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65
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66 vscale1 = float(u.ask('CH1:SCALE?').split()[1])
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67 print(('Channel 1 scale is %.2f volts/div' % (vscale1)))
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68
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69 vscale2 = float(u.ask('CH2:SCALE?').split()[1])
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70 print(('Channel 2 scale is %.2f volts/div' % (vscale2)))
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71
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72 hscale = float(u.ask('HOR:MAIN:SCALE?').split()[1])
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73 print(('Horizontal scale is %.5f nsec/div' % (hscale * 1e9)))
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74 # TEK2024B doesn't grok HOR:DIV? so hard code 10 (has 8 vertically)
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75 acqwindow = hscale * 10.0
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76
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77 while True:
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78 ary1, ary2 = acquire(u, vscale1, vscale2)
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79 #pylab.plot(ary1)
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80 #pylab.plot(ary2)
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81 #pylab.show()
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82 sampletime = acqwindow / len(ary1)
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83 d = getpdiffedge(ary1, ary2) * sampletime
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84
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85 print('Delta is %.1f nsec' % (d * 1e9))
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86 if dbh != None:
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87 now = datetime.datetime.now()
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88 cur.execute('INSERT INTO ppslog(name, time, delta) VALUES(%s, %s, %s)', (name, now, d))
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89 dbh.commit()
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90
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91 def getchannel(u, ch, vscale):
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92 u.write('DAT:SOU CH%d' % (ch)) # Set the curve source to desired channel
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93 result = u.ask('CURVE?', 1.0) # Ask for the curve data
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94 data1 = result[13:] # Chop off the header (should verify this really..)
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95 ary = numpy.frombuffer(data1, dtype = '>h')
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96 ary = ary / 32768.0 * vscale # Scale to volts
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97 return ary
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98
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99 def acquire(u, vscale1, vscale2):
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100 u.write('ACQ:STATE 1') # Do a single acquisition
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101 u.write('*OPC?')
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102 u.read(2.0) # Wait for it to complete
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103
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104 ary1 = getchannel(u, 1, vscale1)
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105 ary2 = getchannel(u, 2, vscale2)
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106
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107 return ary1, ary2
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108
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109 def getpdiffedge(ary1, ary2):
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110 '''Return phase difference in samples between two signals by edge detection'''
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111
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112 # Rescale to 0-1
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113 ary1 = ary1 - ary1.min()
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114 ary1 = ary1 / ary1.max()
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115 ary2 = ary2 - ary2.min()
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116 ary2 = ary2 / ary2.max()
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117
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118 # Find rising edge of each
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119 ary1pos = numpy.argmax(ary1 > 0.2)
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120 ary2pos = numpy.argmax(ary2 > 0.2)
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121
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122 return ary1pos - ary2pos
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123
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124 if __name__ == '__main__':
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125 main()