summaryrefslogtreecommitdiff
path: root/gpscat
blob: 99808dab8e8d57d71f48bbaf2dcbc169ac10bb28 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
#!/usr/bin/env python
#
# This file is Copyright (c) 2010 by the GPSD project
# BSD terms apply: see the file COPYING in the distribution root for details.
#
# Display GPS output.  Hexify it if necessary.
#
import os, sys, termios, socket, select, getopt, curses.ascii
import gps.packet as sniffer

# The spec says 82, but some receivers (TN-200, GSW 2.3.2) output 86 characters
NMEA_MAX = 86

# Lowest debug level at which packet getter begins to emit messages, minus one
BASELEVEL = sniffer.LOG_IO

highhalf_latch = True

def hexdump(st):
    dmp = ""
    for (_i, ch) in enumerate(st):
        if curses.ascii.isprint(ord(ch)) or curses.ascii.isspace(ord(ch)):
            dmp += ch
        else:
            dmp += "\\x%02x" % ord(ch)
    return dmp

debuglevel = 0

def reporter(errlevel, msg):
    if errlevel <= debuglevel:
        sys.stdout.write(msg)

def printusage():
    sys.stderr.write("usage: gpscat [-s speed] [-p] [-t] [-D debuglevel] serial-port\n")

if __name__ == '__main__':
    buf = ""
    try:
        try:
            (options, arguments) = getopt.getopt(sys.argv[1:], "hps:tD:V")
        except getopt.GetoptError, 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 == '-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 == '-D':
                debuglevel = BASELEVEL + int(val)
            elif switch == '-h':
                printusage()
                raise SystemExit, 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 != 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)

        buf = ""
        if not rawmode:
            getter = sniffer.new()
            sniffer.register_report(reporter)
        seqno = 0
        while True:
            (fd, event) = poller.poll()[0]
            if fd == tty and event == select.POLLIN:
                if rawmode:
                    buf += os.read(tty, NMEA_MAX)
                    sys.stdout.write(hexdump(buf))
                    buf = ""
                else:
                    (length, ptype, packet, counter) = getter.get(tty)
                    seqno += 1
                    if length == 0:
                        break
                    if typeflag:
                        sys.stdout.write(`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: