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Re: 3.22 not sending PPS to SHM


From: Greg Troxel
Subject: Re: 3.22 not sending PPS to SHM
Date: Tue, 12 Jan 2021 09:41:31 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (berkeley-unix)

David Taylor <gm8arv@yahoo.co.uk> writes:

> So in the case of the Raspberry Pi, with no DCD or whatever serial PPS
> signal, the only source of PPS is the GPIO pin 18 (in my
> case). ntpshmmon shows just NTP0.  When I use servers 127.127.28.0 and
> 127.127.28.1, SHM0 shows a valid non-zero offset (serial output
> delay), but SHM1 shows no connection:

Does the RPI's operating system provide a /dev/ppsN device associated
with that GPIO pin?   Did you pass that device  on the command line?

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