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

["Charles Muggen" <BeamPower@xxxxxxxx>]

I changed my chrony.conf file as suggested.

##### chrony.conf
driftfile /var/lib/chrony/chrony.drift

log tracking measurements statistics
logdir /var/log/chrony

# Stop bad estimates upsetting machine clock.
maxupdateskew 100.0

dumponexit
dumpdir /var/lib/chrony

local stratum 8
manual
smoothtime 400 0.01
makestep .1 -1

allow
logchange 0.5
rtcsync

# set larger delay to allow the NMEA source to overlap with
# the other sources and avoid the falseticker status
refclock SHM 0 offset 0.5 delay 0.2 refid NMEA noselect
refclock PPS /dev/pps0 lock NMEA refid GPS

now it seems to lock on PPS1, but I don't think PPS1 is not a valid source.
here's the results for chronyc sources:

210 Number of sources = 2
MS Name/IP address         Stratum Poll Reach LastRx Last sample               
===============================================================================
#? GPS                           0   4     0  1192   -43.4s[ -43.7s] +/-  200ms
#* PPS1                          7   4   377    20     +9ns[ +773ns] +/-  629ns





> Sent: Monday, February 05, 2018 at 6:03 AM
> From: "Miroslav Lichvar" <mlichvar@xxxxxxxxxx>
> To: chrony-users@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [chrony-users] getting chrony to work with gpsd on raspbian jessie with gps hat
>
> 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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