[ntp:hackers] u-blox reference clock driver

Gary E. Miller gem at rellim.com
Mon Aug 13 01:01:16 UTC 2018

Yo Achim!

On Sun, 12 Aug 2018 08:27:47 +0200
Achim Gratz via devel <devel at ntpsec.org> wrote:

> Gary E. Miller via devel writes:
> >> And will it work with the Navisys TR units?  
> >
> > Dunno, I have no info on that GPS.  It does need access to the
> > EXTINT0 pin on the u-blox.  I think EXTINT0, for timing, is only
> > available on the FTS variants of the u-blox.  
> No. The EXTINTx function (these inputs are configurable for multiple
> purposes) that is only available on FTS (Frequency & Sync) products is
> using these for feeding in a reference frequency.

I know they can be used for other things.  That is what Lucas used it for.

> You must not have been looking very hard, the uBlox web pages are one
> of the easier ones to navigate when it comes to these things.
> Anyway, I've posted a link to the document containing that list some
> time ago already, here it is again:
> https://www.u-blox.com/sites/default/files/products/documents/u-blox8-M8_ReceiverDescrProtSpec_%28UBX-13003221%29.pdf


> Timestamping is actually supported on all firmware versions and only
> the M8F variant has FTS firmware.  Due to the way the messaging works
> you only get two measurements per second, for the falling and rising
> edge of the same input.

Good, when you get it working, tell us how so we can duplicste.

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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