Re: [chrony-users] getting chrony to work with gpsd on raspbian jessie with gps hat

[Miroslav Lichvar <mlichvar@xxxxxxxxxx>]

On Fri, Feb 02, 2018 at 11:35:42PM +0100, Charles Muggen wrote:
> # set larger delay to allow the NMEA source to overlap with
> # the other sources and avoid the falseticker status
> refclock SHM 0 refid GPS precision 1e-1 offset 0.9999 delay 0.2
> refclock SHM 1 refid PPS precision 1e-9

If you are using the SHM 1 source, which is based on PPS with gpsd,
I'd suggest to either remove the first line or add noselect to it.

You could also use the PPS device directly with SHM 0, e.g.

refclock SHM 0 offset 0.5 delay 0.2 refid NMEA noselect
refclock PPS /dev/pps0 lock NMEA refid GPS

> I made a change to my /boot/config.txt
> I had to add a line that says
>     dtoverlay=pps-gpio,gpio=4
> This points the PPS server to pin 4 of the GPS HAT.
> 
> hmmm, maybe the thing is working... but should the PPS show an asterisk "*"?

How is gpsd started? With a GPIO PPS, I think it needs to be started
with both devices: serial (e.g. /dev/ttyS0) and PPS (e.g. /dev/pps0).

-- 
Miroslav Lichvar

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