GPIO info

I’m working on the GPIO, with .NET Core, but I’m testing sysfs right now. I’ve no problem to output signal to pin, but it seems I can’t read GPIO pin (always return 0).
I’ve exported pin and set direction (pin gpio79 for test).
What I’m doing wrong? ALT functions on the pins unsettled?

hello Cavedano,

suggest you refer to Topic 1029697, and Topic 1030443 to have more details about GPIOs.

Thank you for info, but I discovered the problem. I have a rpi hat that has two buttons. They are pulled up with 10Kohm. On Rpi this is enough for a high level (1) read, but on Nano the pull up need to be a lot stronger, like 1Kohm.