Reply To: Problems with PPS on a Pi0w running raspian and attached to a BerryGPS-IMUv3

[Mark Williams]

I have never see any information in the PPS field.   I also see this in the man documentation;

BUGS AND LIMITATIONS
The PPS Offset field will never be updated when running in client mode, even if you can see PPS events in the packet window. This limitation may be fixed in a future
release.

Regarding PPS test, I was able to get it working right away;

1.  Cabled up GPIO18 (Physical  pin 12) to TP pin on GPS
2. added dtoverlay=pps-gpio,gpiopin=18  to config.txt
3. rebooted

 

pi@raspberrypi:~ $ sudo ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1554704895.005692570, sequence: 320 - clear 0.000000000, sequence: 0
source 0 - assert 1554704896.005720448, sequence: 321 - clear 0.000000000, sequence: 0
source 0 - assert 1554704897.005717314, sequence: 322 - clear 0.000000000, sequence: 0
source 0 - assert 1554704898.005742168, sequence: 323 - clear 0.000000000, sequence: 0

 

Are you using GPIO18 for anything else?

Mark --OzzMaker.com --