Re: Using GPS as a reference clock for NTP?
- From: hmurray@xxxxxxxxxxxxxxx (Hal Murray)
- Date: Wed, 28 Sep 2005 16:45:09 -0500
In article <1127940389.193662.28030@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
jchludzinski@xxxxxxxxx writes:
>I have a GPS device on my box and would like to use its PPS (I believe
>it's the $GPRMC message) as a reference clock for ntpd? I assume it's
>possible? Currently, there is no driver for the GPS device, I'm
>getting position updates by opening the ttyS0 comm port and reading
>$GPGLL messages.
What type of GPS device do you have?
Look at the NMEA driver, #20
If you can setup your box to send $GPRMC messages every second
or few, the rest should be easy.
The $GPGLL messages do have a time time stamp. It should work if you
say something like "ttl 4" on your server line. (The documentation
needs updating.)
The PPS signal is a separate wire, usually connected to DCD,
maybe requiring some external level shifting.
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- From: jchludzinski
- Using GPS as a reference clock for NTP?
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