stratum one on pi 4?
Gary E. Miller
gem at rellim.com
Sat Sep 21 00:59:04 UTC 2019
Yo Paul!
On Fri, 20 Sep 2019 17:49:44 -0700
Paul Theodoropoulos via users <users at ntpsec.org> wrote:
> > Maybe try ubxtool in direct mode?
Did not work?
> So far, I've discovered that one does _not_ want to declare the other
> uart overlays in /boot/config.txt - they just get taken over by our
> beloved systemd as serial devices. So all that's needed in config.txt
> is exactly what's needed on the rpi 3 -
>
> enable_uart=1
> init_uart_baud=115200
> dtoverlay=pps-gpio,gpiopin=4
> dtoverlay=pi3-disable-bt
> dtoverlay=pi3-miniuart-bt
Good to know.
> But, still no PPS - at least not that ntpsec can see.
Did you try gpsd?
> root@ C-NTPsec: ~ # ppstest /dev/pps0
> trying PPS source "/dev/pps0"
> found PPS source "/dev/pps0"
> ok, found 1 source(s), now start fetching data...
> source 0 - assert 1569025998.999693563, sequence: 70 - clear
> 0.000000000, sequence: 0
> source 0 - assert 1569025999.999693151, sequence: 71 - clear
> 0.000000000, sequence: 0
> source 0 - assert 1569026000.999692590, sequence: 72 - clear
> 0.000000000, sequence: 0
That looks good. That is all gpsd needs.
> root@ C-NTPsec: ~ # ntpshmmon
> ntpshmmon: version 3.19-dev
Ah, so you are using gpsd. What was your command line?
Easy check:
pstree -paul | fgrep gpsd
> root@ C-NTPsec: # cat /etc/default/gpsd
> START_DAEMON="true"
> DEVICES="/dev/gpsd0"
> GPSD_OPTIONS="-r -P /var/run/gpsd.pid"
Oh, not good. You forgot "-n /dev/pps0".
> root@ C-NTPsec: ~ # ps -ecf|grep [g]psd
> nobody______ 1039________ 1 TS____ 29 17:37 ?______________ 00:00:01
> /usr/local/sbin/gpsd -r -P /var/run/gpsd.pid /dev/gpsd0
Yup, missing /dev/pps0.
> root@ C-NTPsec: /etc/default # gpsd -V
> gpsd: 3.19-dev (revision dev-3.19a-770-gde7a1c4c)
3.19 has been released. 3.19.1~dev is the current git.
> I have that nagging feeling that I'm missing some trivial little
> thing (as usual).
Or two. "-n", "/dev/pps0".
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem at rellim.com Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can't measure it, you can't improve it." - Lord Kelvin
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