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I have been scouring the web for a few hours now and I cannot seem to fix the problem. I am using RPi 4B 8GB RAM with Ubuntu 22.04 server.

When trying to run C++ code with wiringPi to activate PWM I get this error

pinMode PWM: Unable to do this when using /dev/gpiomem. Try sudo?

I am running my executable through ROS2 and hence cannot give it root privileges. I have already tried:

  • sudo adduser pi gpio
  • sudo usermod -a -G gpio $USER
  • sudo chown root.gpio /dev/gpiomem
  • sudo chmod g+rw /dev/gpiomem

and none will do.

Also the output of my ls -l is

crw-rw---- 1 root dialout 506, 0 Feb 19 21:48 /dev/gpiomem
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