I am having some issues running Chrony with only GPS+PPS (coming from the
GPS) on RPi 4. At the startup gpsd starts running with no particular issue
and I got GPS and PPS solution with no problem checking gpsmon. I have
installed chrony to use the GPS and PPS as a time sources to keep the clock
in
On Mon, Feb 28, 2022 at 1:12 PM Miroslav Lichvar
wrote:
> On Mon, Feb 28, 2022 at 10:37:09AM +0100, Gabriele Coppi wrote:
> > On Mon, Feb 28, 2022 at 8:46 AM Miroslav Lichvar
> > wrote:
> > > On Fri, Feb 25, 2022 at 12:10:40PM +0100, Gabriele Coppi wrote:
> > >
On Mon, Feb 28, 2022 at 8:46 AM Miroslav Lichvar
wrote:
> On Fri, Feb 25, 2022 at 12:10:40PM +0100, Gabriele Coppi wrote:
> > I am having some issues running Chrony with only GPS+PPS (coming from the
> > GPS) on RPi 4. At the startup gpsd starts running with no particular
> i
binary mode timing is not consistent. The gpsd folks
> apparently believe that the arrival time of serial data is untrustworthy and
> should not be used.
>
> I don't understand gpsd internals; version 3.20 didn't show this behavior.
>
> Steve Sommars
>
>
>
keep
>> pretty good time.
>>
>> ( and why would your gps signal go down for a significant time? Are you using
>> your rpi underground somewhere?
>>
>>
>> William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
>> Physics _|___ Advanced R
Hello,
I am currently using *chrony* (v4.0.8) on a RPi4. Due to my application, I
need to use only GPS, PPS and RTC for time keeping. The RTC is necessary to
preserve the time when GPS coverage drops or at boot when the GPS lock is
not immediate.
I have this current *chrony.conf *directives
*directive.
In my mind the RTC should be used by chrony during this blackout periods
Also the RTC that I am using is 3.5 ppm, so it should be 1s over few days
--
Dr. Gabriele Coppi
Marie Curie Skłodowska Fellow,
Department
Ok it seems that using the SHM 1 without the lock works. I will turn it off
tonight and I will check again tomorrow morning to be sure
--
Dr. Gabriele Coppi
Marie Curie Skłodowska Fellow,
Department of Physics
