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

[Tomalak Geret'kal]

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.

Thanks

Tom