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#!/usr/bin/env python
# Script that can read from a serial device and show timestamps.
#
# Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
# Usage:
# scripts/readserial.py /dev/ttyUSB0 115200
import sys, os, time, select, optparse
from python23compat import as_bytes
# Reset time counter after this much idle time.
RESTARTINTERVAL = 60
# Number of bits in a transmitted byte - 8N1 is 1 start bit + 8 data
# bits + 1 stop bit.
BITSPERBYTE = 10
def calibrateserialwrite(outfile, byteadjust):
# Build 4000 bytes of dummy data.
data = "0123456789" * 4 + "012345678" + "\n"
data = data * 80
while 1:
st = time.time()
outfile.write(as_bytes(data))
outfile.flush()
et = time.time()
sys.stdout.write(
"Wrote %d - %.1fus per char (theory states %.1fus)\n" % (
len(data), (et-st) / len(data) * 1000000, byteadjust * 1000000))
sys.stdout.flush()
time.sleep(3)
def calibrateserialread(infile, byteadjust):
starttime = lasttime = 0
totalchars = 0
while 1:
select.select([infile], [], [])
d = infile.read(4096)
curtime = time.time()
if curtime - lasttime > 1.0:
if starttime and totalchars:
sys.stdout.write(
"Calibrating on %d bytes - %.1fus per char"
" (theory states %.1fus)\n" % (
totalchars,
float(lasttime - starttime) * 1000000 / totalchars,
byteadjust * 1000000))
totalchars = 0
starttime = curtime
else:
totalchars += len(d)
lasttime = curtime
def readserial(infile, logfile, byteadjust):
lasttime = 0
while 1:
# Read data
try:
res = select.select([infile, sys.stdin], [], [])
except KeyboardInterrupt:
sys.stdout.write("\n")
return -1
if sys.stdin in res[0]:
# Got keyboard input - force reset on next serial input
sys.stdin.read(1)
lasttime = 0
if len(res[0]) == 1:
continue
d = infile.read(4096)
if not d:
return 0
datatime = time.time()
datatime -= len(d) * byteadjust
# Reset start time if no data for some time
if datatime - lasttime > RESTARTINTERVAL:
starttime = datatime
charcount = 0
isnewline = 1
msg = "\n\n======= %s (adjust=%.1fus)\n" % (
time.asctime(time.localtime(datatime)), byteadjust * 1000000)
sys.stdout.write(msg)
logfile.write(as_bytes(msg))
lasttime = datatime
# Translate unprintable chars; add timestamps
out = as_bytes("")
for c in d:
if isnewline:
delta = datatime - starttime - (charcount * byteadjust)
out += "%06.3f: " % delta
isnewline = 0
oc = ord(c)
charcount += 1
datatime += byteadjust
if oc == 0x0d:
continue
if oc == 0x00:
out += "<00>\n"
isnewline = 1
continue
if oc == 0x0a:
out += "\n"
isnewline = 1
continue
if oc < 0x20 or oc >= 0x7f and oc != 0x09:
out += "<%02x>" % oc
continue
out += c
if (sys.version_info > (3, 0)):
sys.stdout.buffer.write(out)
else:
sys.stdout.write(out)
sys.stdout.flush()
logfile.write(out)
logfile.flush()
def main():
usage = "%prog [options] [<serialdevice> [<baud>]]"
opts = optparse.OptionParser(usage)
opts.add_option("-f", "--file",
action="store_false", dest="serial", default=True,
help="read from unix named pipe instead of serialdevice")
opts.add_option("-n", "--no-adjust",
action="store_false", dest="adjustbaud", default=True,
help="don't adjust times by serial rate")
opts.add_option("-c", "--calibrate-read",
action="store_true", dest="calibrate_read", default=False,
help="read from serial port to calibrate it")
opts.add_option("-C", "--calibrate-write",
action="store_true", dest="calibrate_write", default=False,
help="write to serial port to calibrate it")
opts.add_option("-t", "--time",
type="float", dest="time", default=None,
help="time to write one byte on serial port (in us)")
options, args = opts.parse_args()
serialport = 0
baud = 115200
if len(args) > 2:
opts.error("Too many arguments")
if len(args) > 0:
serialport = args[0]
if len(args) > 1:
baud = int(args[1])
byteadjust = float(BITSPERBYTE) / baud
if options.time is not None:
byteadjust = options.time / 1000000.0
if not options.adjustbaud:
byteadjust = 0.0
if options.serial:
# Read from serial port
try:
import serial
except ImportError:
print("""
Unable to find pyserial package ( http://pyserial.sourceforge.net/ ).
On Linux machines try: yum install pyserial
Or: apt-get install python-serial
""")
sys.exit(1)
ser = serial.Serial(serialport, baud, timeout=0)
if options.calibrate_read:
calibrateserialread(ser, byteadjust)
return
if options.calibrate_write:
calibrateserialwrite(ser, byteadjust)
return
logname = time.strftime("seriallog-%Y%m%d_%H%M%S.log")
f = open(logname, 'wb')
if options.serial:
readserial(ser, f, byteadjust)
else:
# Read from a pipe
while 1:
ser = os.fdopen(os.open(serialport, os.O_RDONLY|os.O_NONBLOCK), 'rb')
res = readserial(ser, f, byteadjust)
ser.close()
if res < 0:
break
if __name__ == '__main__':
main()
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