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Re: gpsd losing connection to ublox

From: Gary E. Miller
Subject: Re: gpsd losing connection to ublox
Date: Fri, 12 Nov 2021 12:05:02 -0800

Yo Niall!

On Fri, 12 Nov 2021 09:47:17 -0800
Niall Parker <> wrote:

> On 2021-11-11 6:31 p.m., Gary E. Miller wrote:
> > Yo Niall!
> >  
> >>     |-gpsd,18077,nobody -n -s 115200 /dev/ttyTHS1 /dev/pps0  
> > I'm xtill concerned that auto-baud is not working for you, and
> > others with similar boards.
> >
> > What kind of driver creates /dev/ttyTHS1?  
> I think it is the serial-tegra 
> ( as the
> hardware is an Nvidia Jetson Xavier NX with tegra194 SOC. Kernel was
> built with SDK and the driver is not a module.

That looks normal in the log.  gpsd does detect it as a normal tty.

> > If you can send me a -D4 log I can maybe see why.  Like this:
> >
> > gpsd -nND 4 /dev/ttyTHS1 > tmp.log 2>&1
> >
> > Let it run a minute and send the log here.  
> A minute's worth attached. Looks like it initially worked but then
> lost track of the speed as I was seeing before.

Odd.  It was working fine, then your GPS just stoppind sending
data for 5 secconds:

gpsd:PROG: UBX-NAV-VELECEF: iTOW=495388000 ECEF vx=0.00 vy=0.00 vz=0.01 
gpsd:PROG: TIMEGPS: time= 1636738570.000014077 mask={TIME}
gpsd:PROG: NAV-EOE: iTOW=495388000
gpsd:PROG: UBX: cycle end x0161 iTOW 495388000
gpsd:PROG: gpsd_multipoll(5) DEVICE_UNCHANGED for 5
gpsd:INFO: SER: fd 5 current speed 230400, 8N1

Any idea why your device stopped sending for 5 seconds?

Have you verified that your device is using 3.3V logic signals?

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  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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