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[gpsd-users] Is GPSD receiving PPS?


From: Jon Brase
Subject: [gpsd-users] Is GPSD receiving PPS?
Date: Thu, 03 Mar 2016 01:32:30 -0600
User-agent: Opera Mail/12.16 (Linux)

Greetings,

I'm running GPSD on a Raspberry Pi with an Adafruit GPS hat. I know that the hardware supports PPS and that I've got the wiring and kernel configuration right because I i get timestamped assert messages with sequence numbers when I run "ppstest /dev/pps0". However, I am not certain that GPSD is actually receiving PPS data. Gpsmon does not indicate that I am getting any PPS data. When I run GPSD itself at debugging level 5 I do not get the carrier detect lines that http://www.catb.org/gpsd/gpsd-time-service-howto.html suggests I should be seeing. If I run CGPS, GPSD starts printing a bunch of lines similar to the following in its output:

gpsd:PROG: Changed mask: {ONLINE|TIME|LATLON|SPEED|TRACK|PACKET|REPORT|PPSTIME} with reliable cycle detection

I'm not sure if the "PPSTIME" bit indicates that I'm getting PPS or not. Is GPSD receiving PPS? If not, what could cause it not to receive PPS when the kernel is receiving PPS? "gpsd -l" indicates that GPSD is compiled with PPS support, and GPSD is being launched as root at boot.

Jon Brase

PS: A previous copy of this message got mangled by my mail client and sent out without a message body. My apologies for any confusion this may have caused.



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