[ntp:questions] problem with ntpd refclock and pps via parallel port

unruh unruh at wormhole.physics.ubc.ca
Mon Feb 1 17:54:21 UTC 2010


On 2010-02-01, Chris Adams <cmadams at hiwaay.net> wrote:
> Once upon a time, David Lord  <dlord at lordynet.org> said:
>>problem with ntpd refclock and  pps via parallel port
>
> Just as an FYI: I'm using a GPS (SVeeSix) with PPS into a parallel port
> under Linux (using user-mode SHMPPS instead of PPS kernel), and it works
> fine.  I typically see offsets from network clock sources under 1 ms.

I use the parallel port as well ( my own interrupt service routine, and
shmpps to deliver the time to ntp) and get typically 1-10usec accuracy.

>




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