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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.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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