SaveTriggers.py

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1. !/usr/bin/env python

import serial import sys, signal, time from datetime import datetime

1. Be sure to set this to the correct device! Under linux, it is something
2. like /dev/ttyACM0. On OSX, it will be /dev/ttyUSBNNNN, where NNNN is
3. some cryptic number. On windows, it will be a COM port (e.g., COM4).

device = '/dev/ttyACM0'

running = True

def handler(signum, frame):

   global running
   running = False

1. Set the signal handler to allow clean exit with a TERM signal

signal.signal(signal.SIGTERM, handler)

if __name__ == "__main__":

   filename = sys.argv[1]
   timeRef = datetime.now()
   with open(filename, 'a') as f:
       f.write('%% Reference time: %s\n' % str(timeRef))
       ser = serial.Serial(device, 115200, timeout=1)
       time.sleep(0.1)
       # Send a trigger pulse to start scanning
       ser.write('[t]\n');
       # Display the firmware greeting
       out = ser.readlines()
       for l in out: print(l),
       # Send the command to enable input pulses
       ser.write('[p]\n');

       while running:
           n = ser.inWaiting()
           if n>0:
             s = ser.read(n)
             if s[0]=='p':
               ts = datetime.now() - timeRef
               totalSeconds = (ts.microseconds + (ts.seconds + ts.days * 24 * 3600) * 10**6) / float(10**6)
               # Print the time stamp as an offset from the reference time, in milliseconds.
               f.write('%0.9f\n' % totalSeconds)

       ser.close()

exit(0)