Re: [chrony-users] PPS correction not being applied

[Brian Gieryk <ke6iyc@xxxxxxx>]

Smallish update:

I changed (in chrony.conf) GPS precision to 1e-6 and added PPS precision at 1e-9.

Now chronyc sources is seeing PPS!

I will let it cook awhile.

Thank you!

Brian

Sent from my iPhone

> On Feb 24, 2017, at 01:34, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
> 
>> On Fri, Feb 24, 2017 at 12:00:42AM -0800, Bill Unruh wrote:
>> You are not logging a crucial thing, refclocks logging.
>> Put refclocks into the logging line in chrony.conf
>> 
>> 
>> Note-- it is pps that gines the accuracy. And you need to lock PPS to a
>> working other source of inaccurate time (better than seconds)
> 
> It would be also good to know what GPS receiver is it. Maybe it
> doesn't have PPS or it is not working? gpsd prints some useful
> messages in the debug mode. E.g.
> 
> gpsd -n -N /dev/ttyS0 -D 9 2>&1 | grep PPS
> 
> Anyway, there are several options when configuring chrony to use GPS
> with gpsd. I think the best options are:
> 
> A) refclock SHM 1
> 
> B) refclock SOCK /var/run/chrony.ttyS0.sock
> 
> C) refclock SHM 0 refid NMEA noselect
>   refclock PPS /dev/pps0 lock NMEA
> 
> Only one should be used at a time. B requires chronyd to be started
> before gpsd. C requires gpsd (or ldattach) to be started before
> chronyd. In A the order doesn't matter.
> 
> -- 
> Miroslav Lichvar
> 
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