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#!/usr/bin/env python
#
"Display GPS output. Hexify it if necessary."
# This file is Copyright (c) 2010 by the GPSD project
# SPDX-License-Identifier: BSD-2-clause
# This code runs compatibly under Python 2 and 3.x for x >= 2.
# Preserve this property!
from __future__ import absolute_import, print_function, division
import getopt
import os
import select
import socket
import sys
import termios
import curses.ascii
import gps
import gps.packet as sniffer
gps_version = '3.19-dev'
if gps.__version__ != gps_version:
sys.stderr.write("gpscat: ERROR: need gps module version %s, got %s\n" %
(gps_version, gps.__version__))
sys.exit(1)
# The spec says 82, but some receivers (TN-200, GSW 2.3.2) output 86 characters
# the Skyrtaq S2525F8 emits 100 chars
NMEA_MAX = 102
# Lowest debug level at which packet getter begins to emit messages, minus one
BASELEVEL = sniffer.LOG_IO
highhalf_latch = True
def hexdump(st):
"Convert string to hex string"
dmp = ""
for ch in bytearray(st): # bytearray gets array of ints in Python 2 and 3
if curses.ascii.isprint(ch) or curses.ascii.isspace(ch):
dmp += chr(ch)
else:
dmp += "\\x%02x" % ch
return dmp
debuglevel = 0
def reporter(errlevel, mesg):
"Report errors, depending on log level"
if errlevel <= debuglevel:
sys.stdout.write(mesg)
def printusage():
"Print usage"
sys.stderr.write("usage: gpscat [-D debuglevel] [-h] [-p] [-s speed] [-t] "
"[-V] serial-port\n")
if __name__ == '__main__':
try:
try:
(options, arguments) = getopt.getopt(sys.argv[1:], "hps:tD:V")
except getopt.GetoptError as msg:
print("gpscat: " + str(msg))
raise SystemExit(1)
speed = None
parity = None
stopbits = None
rawmode = True
typeflag = False
for (switch, val) in options:
if switch == '-D':
debuglevel = BASELEVEL + int(val)
elif switch == '-h':
printusage()
raise SystemExit(0)
elif switch == '-p':
rawmode = False
elif switch == '-s':
if val[-2] in ('N', 'E', 'O'):
parity = val[-2]
stopbits = int(val[-1])
val = val[:-2]
speed = int(val)
elif switch == '-t':
typeflag = True
rawmode = False
elif switch == '-V':
sys.stderr.write("gpscat: Version %s\n" % gps_version)
sys.exit(0)
if len(arguments) != 1:
printusage()
raise SystemExit(1)
if "rfcomm" in arguments[0]: # Bluetooth special case
s = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_STREAM,
socket.BTPROTO_RFCOMM)
s.connect((arguments[0], 1))
tty = s.fileno()
else: # Ordinary device
tty = os.open(arguments[0], os.O_RDWR)
if speed is not None:
(iflag, oflag, cflag, lflag, ispeed, ospeed, cc) = \
termios.tcgetattr(tty)
try:
ispeed = ospeed = eval("termios.B%d" % speed)
except AttributeError:
sys.stderr.write("gpscat: unknown baud rate %d\n" % speed)
raise SystemExit(1)
if stopbits:
cflag &= ~termios.CSIZE
cflag |= (termios.CS8, termios.CS7)[stopbits - 1]
if parity:
if parity == 'N':
iflag &= ~termios.PARENB
iflag &= ~termios.INPCK
elif parity == 'O':
iflag |= termios.INPCK
cflag |= termios.PARENB
cflag |= termios.PARODD
elif parity == 'E':
iflag |= termios.INPCK
cflag |= termios.PARENB
cflag &= ~termios.PARODD
termios.tcsetattr(tty, termios.TCSANOW,
[iflag, oflag, cflag, lflag, ispeed, ospeed, cc])
if not rawmode:
getter = sniffer.new()
sniffer.register_report(reporter)
seqno = 0
while True:
rlist, wlist, xlist = select.select([tty], [], [])
if rlist == [tty]:
if rawmode:
buf = os.read(tty, NMEA_MAX)
if not buf:
break
sys.stdout.write(hexdump(buf))
else:
(length, ptype, packet, counter) = getter.get(tty)
seqno += 1
if length == 0:
break
if typeflag:
sys.stdout.write(repr(ptype) + " (" + repr(length) +
"@" + repr(counter - length) + "): " +
hexdump(packet))
sys.stdout.write("\n")
else:
sys.stdout.write(hexdump(packet) + "\n")
except KeyboardInterrupt:
if rawmode:
sys.stdout.write("\n")
raise SystemExit(0)
# Local variables:
# mode: python
# end:
|
