[time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

Edesio Costa e Silva time-nuts at tardis.net.br
Wed Oct 25 12:02:18 UTC 2017


You could also look at NavSpark
(http://navspark.mybigcommerce.com/navspark-arduino-compatible-development-board-with-gps/). It
has a serial NMEA output, a PPS digital output AND a trigger pin for
timestamp capture.



On Wed, Oct 25, 2017 at 07:45:49AM +0100, Iain Young wrote:
> Hi Michael,
> You Wrote:
> >We are using BeagleBone Black + GPS 1 pps etc in our time-transfer system
> >
> >You can see the overlays in
> >https://github.com/openttp/openttp/tree/develop/software/system/device-tree-overlays
> Very interesting, I will have to clone the git repo, and have a closer
> look.
> I have my own 'fleet' of Beaglebone Blacks and Greens monitoring LORAN and
> GPS. Working to add my small rubidiums and some LF and HF Clocks as
> well. One day I will get the time to document the entire thing!
> I am using the PRUSS to do Time Interval Measurements (details can be
> found in the list archive), and feeding a PPS via TIMER4, and the highly
> accurate timer that the Beaglebones have onboard.
> Is there a particular reason you used the GPIO rather than TIMER4 ?
> (If your google for Dan Drown DMTIMER, you will find the Linux Driver)
> He also has coded up the TCLKIN pin, so that you can clock the
> Beaglebone from an external reference, which also may be of interest.
> (That bit I still need to do - I have the code enabled, just need to
> plug a reference in to the Beaglebones!)
> FreeBSD also has a driver for the TIMER4 input
> Iain
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