| Re: [chrony-users] getting chrony to work with gpsd on raspbian jessie with gps hat |
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#####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 refid GPS precision 1e-1 offset 0.9999 delay 0.2
refclock SHM 1 refid PPS precision 1e-9
#####chronyc sources
210 Number of sources = 2
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#* GPS 0 4 377 17 -6540us[ -11ms] +/- 200ms
#? PPS 0 4 0 - +0ns[ +0ns] +/- 0ns
#####chronyc tracking
Reference ID : 47505300 (GPS)
Stratum : 1
Ref time (UTC) : Fri Feb 02 22:19:35 2018
System time : 0.003947824 seconds slow of NTP time
Last offset : -0.004957667 seconds
RMS offset : 0.010333695 seconds
Frequency : 19.195 ppm slow
Residual freq : -1.445 ppm
Skew : 25.232 ppm
Root delay : 0.200000003 seconds
Root dispersion : 0.100304745 seconds
Update interval : 16.0 seconds
Leap status : Normal
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 "*"?
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