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#!/usr/bin/env python
#
# Display GPS output. Hexify it if necessary.
#
import os, sys, termios, select, getopt, curses.ascii
NMEA_MAX = 82
def hexdump(str):
dmp = ""
for (i, ch) in enumerate(str):
if curses.ascii.isprint(ord(ch)):
dmp += ch
elif ch == '\r' and i+1 < len(str) and str[i+1] == '\n':
dmp += ch
elif ch == '\n' and i-1 >= 0 and str[i-1] == '\r':
dmp += ch
else:
dmp += "\\x%02x" % ord(ch)
return dmp
if __name__ == '__main__':
buf = ""
try:
try:
(options, arguments) = getopt.getopt(sys.argv[1:], "hs:V")
except getopt.GetoptError, msg:
print "gpscat: " + str(msg)
raise SystemExit, 1
speed = None
parity = None
stopbits = None
for (switch, val) in options:
if switch == '-s':
if val[-2] in ('N', 'E', 'O'):
parity = val[-2]
stopbits = int(val[-1])
val = val[:-2]
speed = int(val)
elif switch == '-h':
sys.stderr.write("usage: gpscat [-s] serial-port\n")
raise SystemExit, 0
elif switch == '-V':
sys.stderr.write("gpscat at svn revision $Rev$\n")
raise SystemExit, 0
tty = os.open(arguments[0], os.O_RDWR)
if speed != 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])
poller = select.poll()
poller.register(tty, select.POLLIN)
while True:
(fd, event) = poller.poll()[0]
if fd == tty and event == select.POLLIN:
buf += os.read(tty, NMEA_MAX)
if not buf.endswith("\r"):
sys.stdout.write(hexdump(buf))
buf = ""
except KeyboardInterrupt:
sys.stdout.write("\n")
raise SystemExit, 0
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