38 lines
1.4 KiB
Plaintext
38 lines
1.4 KiB
Plaintext
# SHM refclock is shared memory driver, it is populated by GPSd and read by chrony
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# it is SHM 0
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# refid is what we want to call this source = NMEA
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# offset = 0.000 means we do not yet know the delay
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# precision is how precise this is. not 1e-3 = 1 millisecond, so not very precision
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# poll 0 means poll every 2^0 seconds = 1 second poll interval
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# filter 3 means take the average/median (forget which) of the 3 most recent readings. NMEA can be jumpy so we're averaging here
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refclock SHM 0 refid NMEA offset 0.000 precision 1e-3 poll 0 filter 3
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# PPS refclock is PPS specific, with /dev/pps0 being the source
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# refid PPS means call it the PPS source
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# lock NMEA means this PPS source will also lock to the NMEA source for time of day info
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# offset = 0.0 means no offset... this should probably always remain 0
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# poll 3 = poll every 2^3=8 seconds. polling more frequently isn't necessarily better
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# trust means we trust this time. the NMEA will be kicked out as false ticker eventually, so we need to trust the combo
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refclock PPS /dev/pps0 refid PPS lock NMEA offset 0.0 poll 3 trust
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# enable RTC refclock
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refclock PHC /dev/rtc0 poll 2 offset 0
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# also enable logging by uncommenting the logging line
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log tracking measurements statistics
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# Update RTC from system clock periodically
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makestep 1 3
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# allow local connections to ntp
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allow 10.0.0.0/24
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# manual
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manual
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# tell clients im the big dog
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local stratum 1
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# Good Time Servers
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pool time.cloudflare.com iburst
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