[ntp:questions] PPS signal from Garmin GPS 18x LVC

David Taylor david-taylor at blueyonder.co.uk.invalid
Sun Dec 29 17:45:13 UTC 2013


On 29/12/2013 15:18, Adrian P wrote:
> Thank you very much David!
>
> So "o" means PPS is used... In my case, I only have "*" in front of
> the driver IP.... So I suppose NTP is not using the PPS signal... hmm,
> wondering why. This is my output:
>
> server 127.127.20.0 mode 1 minpoll 4 maxpoll 4 prefer
> fudge 127.127.20.0 flag1 1 flag2 0 flag3 1 refid PPS
>
> root at debian:~# ntpq -crv -pn
> associd=0 status=0415 leap_none, sync_uhf_radio, 1 event, clock_sync,
> version="ntpd 4.2.6p5 at 1.2349-o Sat May 12 09:07:18 UTC 2012 (1)",
> processor="i686", system="Linux/3.2.0-4-686-pae", leap=00, stratum=1,
> precision=-19, rootdelay=0.000, rootdisp=39.519, refid=PPS,
> reftime=d66ab9bb.59e07233  Sun, Dec 29 2013 17:09:47.351,
> clock=d66ab9ca.45e6469f  Sun, Dec 29 2013 17:10:02.273, peer=52263, tc=4,
> mintc=3, offset=14.437, frequency=50.557, sys_jitter=23.063,
> clk_jitter=19.669, clk_wander=5.553
>       remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> *127.127.20.0    .PPS.            0 l   15   16  377    0.000   14.437  23.063
[]
> The PPS line discipline is attached as well:
>
> root at debian:~# ps -ef | grep ldattach
> root       493     1  0 09:46 ?        00:00:00 /usr/sbin/ldattach pps
> /dev/ttyS0
> root      2157  2069  0 17:15 pts/0    00:00:00 grep ldattach
> root at debian:~#
>
> What else should I check?
>
> Many thanks again.

Adrian,

Can you try the ppstest utility?  I have some notes on my Raspberry Pi 
page - look for the string: "Checking the PPS is working"  on the page:

   http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html

RPi's Linux is based on Debian....

-- 
Cheers,
David
Web: http://www.satsignal.eu



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