Re: 3.22 not sending PPS to SHM

[David Taylor]

On 13/01/2021 19:13, Gary E. Miller wrote:
> Yo David!
>
> On Wed, 13 Jan 2021 09:40:17 +0000
> David Taylor<gm8arv@yahoo.co.uk>  wrote:
>
> > Let me put a simple question.  In my configuration (and, yes, there
> > is an RTC on the Raspberry Pi HAT) I have two connections:
> >
> > - a serial port connection sending NMEA/UBX data.
> >
> > - a GPIO connection for the PPS data.
> Like the Uputronics board.  Having an RTC is nice.
>
> Did you fix the issue I reported to you?
>
> > Is it acceptable practice to use a type 22 driver for NTP to get its
> > PPS,
> Not here on the gpsd email list.  Here we use the SHM NTP driver.
>
> > and at the same time to use a 28.0 driver to get GPSD's coarse
> > time data?
> It can be done, but all you do is confuse the NTP cluster algorithm.
>
> > This appears to work correctly.
> The problem is only one program can read the serial device at a time.
> So without some plumbing that can not work.
>
> RGDS
> GARY

Accept that only one device can read the serial, but in this case the 
PPS isn't coming over the serial.

I have this working well at the moment, with NTP reading PPS from type 
22, and getting coarse time from GPSD, so I'm minded to leave it.

Cheers,
David
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