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Re: [gpsd-users] PPS from kernel into gpsd

From: Tomalak Geret'kal
Subject: Re: [gpsd-users] PPS from kernel into gpsd
Date: Wed, 04 Apr 2012 19:27:07 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.1) Gecko/20120208 Thunderbird/10.0.1

On 04/04/2012 19:05, Alexander Carver wrote:
On 4/4/2012 11:01, Tomalak Geret'kal wrote:

Now I want to use this PPS to steer ntpd in SHM(1), along with the
NMEA-derived time that's already serving me well in SHM(0).

According to [1], gpsd can use the RFC 2783 kernel PPS API "for extra accuracy". Can I use it as the sole source of PPS? How? Do I add /dev/pps0 to gpsd's device list? [..]

Skip gpsd and use ntpd's ATOM driver (refclock 22) to directly read in /dev/pps0 into ntpd.

Ah.. that appears to make much more sense.

It appears not to be entirely working for me yet:

# ntpq -p
remote refid st t when poll reach delay offset jitter
*SHM(0) .SHM. 0 l 17 16 377 0.000 -6.959 74.995 PPS(1) .PPS. 0 l - 16 0 0.000 0.000 0.008 localhost .INIT. 16 l - 16 0 0.000 0.000 0.000

But I suppose that's a question for another list now.



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