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Re: [gpsd-dev] [PATCH] [RFC] gpsmon: add PPS monitoring at -D2 debug lev

From: Beat Bolli
Subject: Re: [gpsd-dev] [PATCH] [RFC] gpsmon: add PPS monitoring at -D2 debug level
Date: Sat, 02 Nov 2013 00:26:48 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:24.0) Gecko/20100101 Thunderbird/24.1.0

On 02.11.13 00:24, Greg Troxel wrote:
> Andy Walls <address@hidden> writes:
>> IIRC gpsd has code in it to guess the proper edge based on the
>> relative lengths of the assert and deassert periods.  PPS pulses are
>> short so the beginning edge of the short period should be it.
> Exactly.  But it's interesting to know which is which, for configuring
> ntpd, which does not do this auto-sensing.  So I'd like the debug output
> to print out which way gpsd thinks the pulse is working.
You can have that with -D7 (from the patched gpsmon log):

gpsd:RAW: PPS pps-detect on /dev/ttyS0 changed to 1
gpsd:INFO: PPS cycle:  999860, duration:  899943 @ 1383348322.002365
gpsd:RAW: PPS edge accepted 1Hz leading edge
gpsd:RAW: PPS edge  1383348322.2365000 offset -0.002365000
gpsd:RAW: PPS pps-detect on /dev/ttyS0 changed to 0
gpsd:INFO: PPS cycle:  999940, duration:   99997 @ 1383348322.102362
gpsd:RAW: PPS edge rejected 1Hz trailing edge

mail: echo '<address@hidden>' | tr -d '[A-S]'
pgp: 0x506A903A; 49D5 794A EA77 F907 764F  D89E 304B 93CF 506A 903A
icbm: 47.0452 N, 7.2715 E

"It takes love over gold, and mind over matter" -- Dire Straits

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