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

Scott Stobbe scott.j.stobbe at gmail.com
Wed Nov 9 11:57:30 EST 2016


FWIW, the 16450 uart can interrupt on any modem line change, whether it be
rising or falling.

On Wed, Nov 9, 2016 at 11:41 AM, Chris Albertson <albertson.chris at gmail.com>
wrote:

> 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
> constant.
>
> 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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