Ah; I saw an example with .1 where the actual device path was given later with the 'pps' directive in /etc/ntp.conf. I've changed to .0 which must be closer.. many thanks for that.
The result hasn't changed actually but I'll look into it again after I get back to my desk and before I post back.
Cheers guys
PS also apologies for the top-post; just typing on this thing is hard enough!
Sent from my HTC
----- Reply message ----- From: "Alexander Carver" <address@hidden> To: <address@hidden> Subject: [gpsd-users] PPS from kernel into gpsd Date: Wed, Apr 4, 2012 19:45
On 4/4/2012 11:27, Tomalak Geret'kal wrote: > 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 http://catb.org/gpsd/gpsd.html [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.
Looks like you're using the wrong PPS id number. For /dev/pps0 your ntpd config file should be 127.127.22.0. That peer status shows you're using 127.127.22.1 which causes ntpd to look for /dev/pps1 instead.