Can't get GPS/PPS to work
Philipp Ammann
philipp.ammann at posteo.de
Fri May 20 10:55:20 UTC 2022
Hi Hal,
Am 19.05.22 um 03:34 schrieb Hal Murray:
> I don't see anything obviously wrong.
>
> If I was chasing this, I would turn on clockstats. You may want to remove the
> minpoll/maxpoll, to reduce logging clutter. That will also simplify things
> slightly.
>
> clockstats will give you a line of counters every polling interval. I forget
> what they mean, but the details are in the documentation. (and/or code)
>
> On Linux, you can sanity check the PPS with:
> cat /sys/devices/virtual/pps/pps0/assert
> cat /sys/devices/virtual/pps/pps0/clear
> One should count, the other should be stopped (ntpd turns it off).
Thank you for the hint. Will try that if I need further debugging :)
>
> Does the uBlox Neo-7M default to 9600 baud and NMEA?
The Neo-7M supports only 9600 Baud.
> Is ttyAMA0 tangled up with Bluetooth on the Pi 4? (I forget how to kill Bluetooth.)
Bluetooth is disabled using "dtoverlay=disable-bt" in config.txt. AMA
seems to be an ARM-specific name for a serial port.
Thanks
Philipp
>
>
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