GPIO problem

[Baxi]

Hello

 

I'm running the NAS on Orange PI 5. I've run Armbian with EDK2 from https://github.com/armbian/build/pull/5900. The system starts from SSD disk connected via PCIE card with 4 SATA ports. I wanted to run simple fan control via GPIO, but setting the value 1 or 0 on GPIO has no effect and the multimeter connected to GPIO always shows 2.85V. How I did it. I installed wiringOP as the manual says. I selected GPIO 0 and entered the commands
gpio mode 0 out
gpio write 0 0
I connected a multimeter to GPIO 0 but it always shows 2.85V
when I did
gpio write 0 1
the multimeter also shows 2.85V
gpio readall
shows 1 in column V when "gpio write 0 1" command is
shows 0 in column V when "gpio write 0 0" command is
Does anyone have an idea what I'm doing wrong?

[ning]

you can't use GPIO as power supply for fan, this will break the gpio bank.

 

you can use GPIO as ON/OFF switch for fan, you should use "gpio-fan" driver.

 

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Documentation/devicetree/bindings/hwmon/gpio-fan.txt?h=v6.7.8

 

by this you can use /sys/class/thermal/cooling_deviceX/state control you fan, but if you want to system automatically enable your fan at certan temperature,

you need register the fan as a cooling device, for cpu/gpu or hard driver.

 

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml

[Baxi]

Thank you for your answer.

Sorry, I didn't write this, but GPIO is sterring the fan through a transistor. 

I will check it on a newer version of the distribution, the one I have is the beta version. Maybe that's the problem.

 

 

[Baxi]

Firmware update solved the problem.