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author | Eric S. Raymond <esr@thyrsus.com> | 2005-02-14 02:52:12 +0000 |
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committer | Eric S. Raymond <esr@thyrsus.com> | 2005-02-14 02:52:12 +0000 |
commit | 51c14f1b1b101d27ad6a9c8442cb6d3a6f1a4319 (patch) | |
tree | cdb3935e1d509af4c920afd15430b28e6b18ed41 /HACKING | |
parent | 0b6fad5d2ee5112b101e2fc28679d0844d252e5a (diff) | |
download | gpsd-51c14f1b1b101d27ad6a9c8442cb6d3a6f1a4319.tar.gz |
Don't use colons in B command.
Diffstat (limited to 'HACKING')
-rw-r--r-- | HACKING | 7 |
1 files changed, 7 insertions, 0 deletions
@@ -28,6 +28,13 @@ subsecond precision; I recommend using ntpd, which will normally give you about 15 microseconds precision (two orders of magnitude better than GPSes normally report). +Another helpful command is B. Without arguments, it triggers a response +of the form <baudrate> <bits> N <stopbits>, e.g. "4800 8 N 1" describing +the communications parameters of the link to the GPS. If profiling is +enabled, B may be followed by an equals sign and a baud rate; the link +will then change to that rate. This feature is not enabled by default +because it is not secured and can be used to effectively disable the GPS. + The distribution lincludes a Python script, gpsprof, that uses the Z command to collect profiling information from a running GPS instance. You can use this to measure the latency at each stage -- GPS to daemon, |