[time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

Chris Albertson albertson.chris at gmail.com
Wed Nov 9 11:41:24 EST 2016

On Tue, Nov 8, 2016 at 11:08 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

> gem at rellim.com said:
> > Who cares if the PPS is inverted?

If the signal is NOT inverted then the raising edge will be within
nanoseconds of the UTC seconds "tick".    The inverted PPS will have the
edge delayed somewhat.   It is not even clear if the length of the delay is

If using the PPS for timing and the PPS is inverted you will have to
measure the delay length an account for in the config file.


Chris Albertson
Redondo Beach, California

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