| Re: [chrony-users] PPS time |
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John Burton wrote:
> I used information from the GPSD web site as far as set up and
> configuration: https://gpsd.gitlab.io/gpsd/gpsd-time-service-howto.html
> This provides a good introduction to setting up a GPS network clock...
> Basically you use GPSD to talk to the GPS receiver, which uses KPPS
> to handle the PPS interrupt. GPSD handles all the details of serial
> port & where the PPS signal is coming from.
Yup. That's the configuration I *used* to have, that I need to
move away from, which is why I'm working to configure /dev/pps0
and have chrony talk to it directly, *without* gpsd handling the
details.
(Why? In my environment, I have GPS reception only intermittently.
I have a high-precision reference clock to keep time, via its own
PPS output, when I have no GPS. But if I feed my reference clock's
PPS into gpsd along with the time messages from my GPS receiver,
then when I have no GPS, gpsd rightly assumes that PPS is no good
either, and stops forwarding it to chrony. Thus the need for a
direct PPS feed into chrony.)
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