[Linuxpps] Duplicated sequence numbers
Rodolfo Giometti
giometti at linux.it
Tue May 30 10:07:51 CEST 2006
On Mon, May 29, 2006 at 11:54:30PM +0100, Adam James wrote:
>
> Thanks for your remarkably quick reply, it is much appreciated!
>
> I now get the following output from ppstest:
>
> # ./ppstest
> found PPS source #0 "pps_8250_0" on "/dev/ttyS0"
> assert 1148941843.001278000, sequence: 7357 - clear 1148941843.101270000, sequence: 7357
> assert 1148941844.001280675, sequence: 7358 - clear 1148941843.101270000, sequence: 7357
> assert 1148941844.001280675, sequence: 7358 - clear 1148941844.101272000, sequence: 7358
> assert 1148941845.001293675, sequence: 7359 - clear 1148941844.101272000, sequence: 7358
> assert 1148941845.001293675, sequence: 7359 - clear 1148941845.101272000, sequence: 7359
> assert 1148941846.001297675, sequence: 7360 - clear 1148941845.101272000, sequence: 7359
> assert 1148941846.001297675, sequence: 7360 - clear 1148941846.101274000, sequence: 7360
> assert 1148941847.001278675, sequence: 7361 - clear 1148941846.101274000, sequence: 7360
> assert 1148941847.001278675, sequence: 7361 - clear 1148941847.101275000, sequence: 7361
>
> As the timestamps are duplicated along with the sequence numbers, I
> presume that the PPS signal is being received correctly.
Ok.
> Could you shed any light on the following message output by ntpd:
>
> ntpd[7024]: refclock_nmea: time_pps_kcbind failed: Operation not supported
>
> Is this a limitation of the current implentation, on a problem at my
> end?
The function time_pps_kcbind() is an «optional» PPS function. As
described by RFC 2783:
An implementation MUST provide this function, but it may be
implemented as a function that always return an EOPNOTSUPP error,
possibly on a per-source basis:
- time_pps_kcbind()
And LinuxPPS always returns EOPNOTSUPP:
case PPS_KC_BIND : {
/* Feature currently not supported */
nlpps->ret = -EOPNOTSUPP;
break;
}
Ciao,
Rodolfo
--
GNU/Linux Solutions e-mail: giometti at enneenne.com
Linux Device Driver giometti at gnudd.com
Embedded Systems giometti at linux.it
UNIX programming phone: +39 349 2432127
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