Re: COEX GPS (model UBX-M8030 IC) on Raspberry Pi 4 Model B 2018 connection issues

[Gary E. Miller]

Yo Aranza!

On Thu, 22 Jul 2021 21:44:00 -0700
Aranza Shaccid Leon <leon18@pnw.edu> wrote:

> I checked my dmesg just now, ttyACM0 is the GPS while ttyACM1 is the
> flight controller.

Which explains some of your bad results.

> Here is the proof of this:
> 
>  udevadm info -a -p $(udevadm info -q path -n /dev/ttyACM0)

A lot easier to look at dmesg.  Or just look at "lsusb -v'

> I redid the previous commands and here are the results:
> 
> systemctl stop gpsd
> sudo systemctl disable gpsd
> systemctl stop gpsd.socket
> systemctl disable gpsd.socket

If you have truly deafated systemd(dumb) control of port 2947, then you
do not need to keep doing that.

> sudo su -
>  gpsd -n /dev/ttyACM0
> cgps  *(this works now)*

Finally.

Now you know why I kept asking how you are sure about your device names.

> + gpspipe -w -n 2 -x 20
> gpspipe: invalid option -- 'x'

Well, that is still broken, and the next thing to look at.

> root@clover-1060:~# gpsd -nND 4 /dev/ttyACM0

That looks good now.

> gpsd:PROG: NTP: ntpshm_put(/dev/ttyACM0,-20)  1627006166.000000000 @
>  1626925563      .225722496

Your system clock is still way off.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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