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E320 how use the E320 as ntp time server using its internal gpsdo as time source

Martin

Fri, Aug 20, 2021 1:40 PM

Hi,

I am trying to setup the E320 so it will synchronise its time to the
internal gpsdo and become a ntp time server.

But I have not been able to find much info. It seems to have been
supported on E310 in 2015.

If I check the E320 OS time it seems to be about 0.2 seconds different
from the usrp gps time. So it seems the host time is not synced to the
gpsdo by default.

usrp_gps_time_now = 2021-08-20 13:21:51.00443925 UTC
host_pc_time_now = 2021-08-20 13:21:51.2055671215057373 UTC

Any hints/links on how to install / configure ntp or chrony and gpsd so
it uses the gpsdo as time source.

root@ni-e320-321D09C:/pub/tests# uname -a
ni-e320-321D09C: Linux ni-e320-321D09C 5.2.28-yocto-standard #1 SMP
PREEMPT Mon Sep 14 02:08:15 UTC 2020 armv7l armv7l armv7l GNU/Linux

I hope to hear from you soon.

Thank you and best regards,
Martin

Hi, I am trying to setup the E320 so it will synchronise its time to the internal gpsdo and become a ntp time server. But I have not been able to find much info. It seems to have been supported on E310 in 2015. If I check the E320 OS time it seems to be about 0.2 seconds different from the usrp gps time. So it seems the host time is not synced to the gpsdo by default. usrp_gps_time_now = 2021-08-20 13:21:51.00443925 UTC host_pc_time_now = 2021-08-20 13:21:51.2055671215057373 UTC Any hints/links on how to install / configure ntp or chrony and gpsd so it uses the gpsdo as time source. root@ni-e320-321D09C:/pub/tests# uname -a ni-e320-321D09C: Linux ni-e320-321D09C 5.2.28-yocto-standard #1 SMP PREEMPT Mon Sep 14 02:08:15 UTC 2020 armv7l armv7l armv7l GNU/Linux I hope to hear from you soon. Thank you and best regards, Martin

thebouleoffools@gmail.com

Wed, Sep 8, 2021 10:40 PM

Assuming you have ntp on your device (default img from ettus doesn’t have it), set /etc/ntp.conf to:

# GPS Serial data reference
server 127.127.28.0 minpoll 4 maxpoll 4
fudge 127.127.28.0 time1 0.0 refid GPS

# GPS PPS reference
server 127.127.28.1 minpoll 4 maxpoll 4 prefer
fudge 127.127.28.1 refid PPS

And enable the ntp service in systemd. If you don't have ntp, you'll have to cross compile it.

Assuming you have ntp on your device (default img from ettus doesn’t have it), set /etc/ntp.conf to: ``` # GPS Serial data reference server 127.127.28.0 minpoll 4 maxpoll 4 fudge 127.127.28.0 time1 0.0 refid GPS # GPS PPS reference server 127.127.28.1 minpoll 4 maxpoll 4 prefer fudge 127.127.28.1 refid PPS And enable the ntp service in systemd. If you don't have ntp, you'll have to cross compile it. ```