[ntp:questions] Using PPS

Joshua Small JSmall at daraco.com.au
Fri Dec 28 10:00:54 UTC 2012


I've just sorted this out. 

Although I followed the guide I linked mostly, I did read this page regarding "known issues" and used the configure flags recommended there:

That page has bad advice it appears. After recompiling with the originally recommended flags, I get the desired PPS output on ntpq.

It does feel like a bug though. Clearly I missed the flags required for both driver 20 and 22 in my configure script. If I put 22 in my ntp.conf, I got an event telling me, and you know it's broken. With driver 20, it said "ok" and never did anything.

David, I tried alternating 20 and 22, they both work now for me. I didn't do anything special afaik.

From: questions-bounces+jsmall=daraco.com.au at lists.ntp.org [questions-bounces+jsmall=daraco.com.au at lists.ntp.org] on behalf of David Taylor [david-taylor at blueyonder.co.uk.invalid]
Sent: Friday, 28 December 2012 8:26 PM
To: questions at lists.ntp.org
Subject: Re: [ntp:questions] Using PPS

On 28/12/2012 06:53, Kennedy, Paul wrote:
> I use the type 20 driver on my pi, and PPS to the GPIO boards works a
> treat with an $RMC or $ZDA string.
> regards
> pk

That's helpful to know, Paul.  Do you mean "ports" rather than "boards",
or are you using an add-on board?  What modifications did you make to
the kernel to get the PPS detected?
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