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Compute Module • Re: Configuring CM4 with HW-658 GPS Module

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Thanks
1. Yes /dev/ttyAMA0 exists.
2. not sure how to check whether it is used for any other purpose.
3.

Code:

sudo apt install picom
correctly installs v3.1-4+b1
running

Code:

picocom -b 9600 /dev/ttyyAMA0 
outputs a stream of NMEA messages each second
however

Code:

xgps
returns xgps: host localhost port 2947,
then displays the circular plot view of the 'sky', but populates no satellites onto it, no matter how long I wait.

for info:
the HW-658 GPS module LED is flashing once per second
running

Code:

sudo hwclock --show
produces 'sudo: hwclock: command not found'
running

Code:

sudo ppstest /dev/pps0 
produces the output above every second...

Statistics: Posted by davesedar — Sun Jan 04, 2026 3:28 pm



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