Re: Recommendation for GPS dongle

[Chris Kuethe]

It doesn't need to be using a 3rd party converter. You're right to say
that it has no "speed" because it's an ACM device; by the same logic
if you're using some terrible software that demands you enter a speed,
plug in "115200" and be on your merry way. I just plugged in a ublox7
and minicom produces the exact same output at 115200 or 9600. GPSD
does too.

Maybe they figure that trying to transport PPS over a shared, polled,
variably loaded bus like USB is bogus and if you're doing that you
don't actually care about timing precision? Alas, my one contact at
u-blox no longer works there otherwise I'd ask them why. I see you've
also attempted to inquire on the forums...


On Thu, Dec 30, 2021 at 12:27 PM Gary E. Miller <gem@rellim.com> wrote:
>
> Yo Chris!
>
> On Thu, 30 Dec 2021 12:12:22 -0800
> Chris Kuethe <chris.kuethe@gmail.com> wrote:
>
> > On Thu, Dec 30, 2021 at 11:19 AM Gary E. Miller <gem@rellim.com>
> > wrote:
> > > PPS was part of the original requirement.
> > >
> > > Why do they not output PPS?  It is just a one wire change!
> >
> > I would guess that they're using the native ublox chipset USB support
> > which doesn't seem to support transporting timepulses over USB... at
> > least, I see nothing in the manual that indicates that this is
> > possible, only that it can be configured on specific pins.
>
> Their web page says 115,200 baud.  The u-blox native USB has no
> "speed".  So it has to be using a serial to USB converter.  Thus
> easy to add the PPS pin to RI.
>
> And why do the u-blox native USB parts not support PPS?  u-blox
> lives in a bubble.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         gem@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



--
GDB has a 'break' feature; why doesn't it have 'fix' too?