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Re: [gpsd-dev] Clarifications needed for the time-service HOWTO
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-dev] Clarifications needed for the time-service HOWTO |
Date: |
Sun, 20 Oct 2013 22:00:47 -0700 |
Yo Hal!
On Sat, 19 Oct 2013 21:16:49 -0700
Hal Murray <address@hidden> wrote:
> What do you mean by "KPPS"?
I use KPPS as shorthand for RFC 2783.
> RFC-whatever has two parts. One is to just grab the time stamp when
> the modem control signal changes, and the API to read it. The other
> is to push the whole timekeeping phase locked loop into the kernel.
> Linux doesn't implement the second part.
Uh, no. I suggest you read RFC 2783 again. It just says what you define
as part one. And Linux supports all the mandatory parts.
> On Linux, things like
> cat /sys/class/pps/pps0/assert
> will give you things like:
> 1382242063.999995003#2900635
> The stuff after the # is a counter. The stuff before it is a
> timestamp. Looks like this box is off by 5 microseconds.
That is not RFC 2783, that is linux specific. gpsd does NOT use that
at this time.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
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Re: [gpsd-dev] Clarifications needed for the time-service HOWTO, Gary E. Miller, 2013/10/21