Re: System time from GPS

[Takashi Matsuzawa <tmatsuzawa@xxxxxxxx>]

I did this sometime ago but my memory is scarce.
I think connman itself also has ntp function which may conflict with nptd or gpsd unless it is disabled?

________________________________________
From: automotive-discussions-bounces@xxxxxxxxxxxxxxxxxxxxxxxxx <automotive-discussions-bounces@xxxxxxxxxxxxxxxxxxxxxxxxx> on behalf of Jan-Simon Möller <jsmoeller@xxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, October 31, 2018 11:28:05 AM
To: automotive-discussions@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: Jason Reich
Subject: Re:  System time from GPS

Hi Jason,

Am Dienstag, 30. Oktober 2018, 21:14:19 CET schrieb Jason Reich:
> Hi,
>
> I'm working on an M3+Kingfisher with Flounder, and our builds are always
> booting with date/time set to the build time (the M3 doesn't have any RTC).
>  For our demo setups I'm trying to get the system time set, using GPS if
> possible.
>
>
> I understand that the eventual architecture is to use the GPS signal to
> acquire a time, rather than using any network time (as described in the AGL
> Requirements Specification).  But I can't see anything in the OS starting
> in this direction.  The KF has a GPS and I can get time from it, but am I
> missing something in the OS or the AGL build that will start to integrate
> GPS time with the system time?

Skimming
http://catb.org/gpsd/gpsd-time-service-howto.html

I assume that you might have to check that:
- kernel modules / options enabled
- ntp configured (or the systemd alternative?)

 For one-time updates maybe check the commands here
 https://raspberrypi.stackexchange.com/questions/11896/set-system-clock-to-value-received-from-gps

Best,
JS


>
> Right now I've got connman configured to perform a network time sync, so
> I've got things functional.  But is there any way in today's FF builds to
> use GPS to set the system time?
>
>
> thanks
>
> Jason.


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