[ntp:hackers] u-blox reference clock driver

[Gary E. Miller]

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

Incomplete.

> 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.

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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