[LinuxPPS] parallel PPS

[Paul]

Hardly what you were asking, but I picked up on something you said. Is your 
Jupiter Rockwell NMEA really solid? You said that you use time1 1.0, but does 
it sometimes jump a second, requiring time1 2.0 or even time1 0.0? I had 
terrible problems and in the end and only used the PPS from this module. 
Interestingly this has been noted long ago, check out the 'original'  driver 
for the Rockwell module on the NTP site, which also mentions this problem

Paul

On Friday 29 February 2008 14:44, Remco den Besten wrote:
> Hello everyone,
>
> I have LinuxPPS running with kernel 2.6.24 and the 'first' 2.6.24-patch for
> some time now
> and use it in conjuction with a Jupiter Rockwell GPS-module and an Efratom
> Rubidium standard.
>
> Ntpd 4.2.4p2 with the patched NMEA driver (thanks Udo) is used, using a
> time1 of 1.0 for the Jupiter module.
> Connecting the Rubidium standard results in fudge after a while because it
> is not synced to
> second epochs. After this, everything is rock stable (besides my
> systemclock ;-(
>
> When using my Rubidium standard, the PPS precision is only working in
> conjunction with 'another
> driver'. So I 'fooled' ntpd by initializing an NMEA server with a high
> stratum and inserted
> the Rb87 PPS on the DCD pin of the corresponding serial port.
>
> However, I want to try the ACK pin of the parallel port too (for some
> reasons).
> When I read the LinuxPPS wiki I can'f figure out how to use the parallel
> port.
>
> I made the 'character devices' pps0 and 1 via mknod /dev/pps0 c 254 0 or 1
> (so not 253 ?!)
> and from what I understand are these devices are 'activated' as soon as one
> of the serial ports is
> placed into the 'hardpps' mode, as can be seen with 'tree /sys/class/pps'
>
> But.. how to assign the parallel port /dev/pps0 or 1 ?
>
> Kind regards,
>
> Remco
>
>
>
> _______________________________________________
> LinuxPPS mailing list
> LinuxPPS at ml.enneenne.com
> http://ml.enneenne.com/cgi-bin/mailman/listinfo/linuxpps
> Wiki: http://wiki.enneenne.com/index.php/LinuxPPS_support