Wiki info on how to get non-root RPI GPIO access is wrong

[erkexzcx]

Hi.

Instructions at the bottom of this page -> Wiki called Non-Root GPIO does not work.

For example, I try to run my C app using regular user and get this:
$this->bbcode_second_pass_code('', 'wiringPiSetup: Unable to open /dev/mem or /dev/gpiomem: Permission denied.
Aborting your program because if it can not access the GPIO
hardware then it most certianly won't work
Try running with sudo?')

But if I try as root user - everything works as expected.

Yes, I did add myself to tty group as per instructions, but still does not work. What else I could try?

[ArchGalileu]

It happens to me also.

Very frustrating

Any advice from community?

Best regards
ArchGalileu

[lategoodbye]

A lot of so-called GPIO libraries accesses the IO register of the BCM2835 directly via /dev/mem or indirectly via /dev/gpiomem (requires rpi downstream driver). Both ways are a security nightmare. Every good distribution should avoid this.

The hardware independent way would be to use sysfs or the new libgpiod.