[ntp:questions] More than one PPS source on Raspberry Pi?

Miroslav Lichvar mlichvar at redhat.com
Tue Dec 5 09:01:52 UTC 2017


On Mon, Dec 04, 2017 at 04:25:26PM -0500, Brian Utterback wrote:
> Doesn't adding a second PPS signal mean that the accuracy can only go down?
> If the two PPS signals are really in sync then they will be clocking
> essentially simultaneously. They won't get serviced simultaneously so one
> will either be ignored or will be serviced after a delay.

I think some GPS units can be configured to shift the PPS edge by a
specified offset to avoid two PPS signals triggering an interrupt at
the same time.

-- 
Miroslav Lichvar


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