2 # Script that can read from a serial device and show timestamps.
4 # Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net>
6 # This file may be distributed under the terms of the GNU GPLv3 license.
9 # tools/readserial.py /dev/ttyUSB0 115200
16 # Reset time counter after this much idle time.
18 # Alter timing reports based on how much time would be spent writing
21 # Number of bits in a transmitted byte - 8N1 is 1 start bit + 8 data
25 def readserial(infile, logfile, baudrate):
29 byteadjust = float(BITSPERBYTE) / baudrate
33 res = select.select([infile, sys.stdin], [], [])
34 except KeyboardInterrupt:
35 sys.stdout.write("\n")
37 if sys.stdin in res[0]:
38 # Got keyboard input - force reset on next serial input
44 datatime = time.time()
46 datatime -= len(d) * byteadjust
48 # Reset start time if no data for some time
49 if datatime - lasttime > RESTARTINTERVAL:
53 msg = "\n\n======= %s (adjust=%d)\n" % (
54 time.asctime(time.localtime(datatime)), ADJUSTBAUD)
59 # Translate unprintable chars; add timestamps
63 delta = datatime - starttime - (charcount * byteadjust)
64 out += "%06.3f: " % delta
68 datatime += byteadjust
79 if oc < 0x20 or oc >= 0x7f and oc != 0x09:
90 print "Usage:\n %s [<serialdevice> [<baud>]]" % (sys.argv[0],)
99 serialport = sys.argv[1]
100 if len(sys.argv) > 2:
101 baud = int(sys.argv[2])
103 ser = serial.Serial(serialport, baud, timeout=0)
105 logname = time.strftime("seriallog-%Y%m%d_%H%M%S.log")
106 f = open(logname, 'wb')
107 readserial(ser, f, baud)
109 if __name__ == '__main__':