Hello everyone!
I need to put on the internet a service my friends can access so I cleaned the dust from my Raspberry Pi 4b ready to put it to work.
Previously such service was implemented on Fedora 34, for security’s sake I thought an update was needed.
Installing and setting up f42 Server edition went smooth but now I’m having issues implementing a basic fan control.
I have a three pin fan, one ground, one voltage and the other control (blue cable in GPIO10 pin).
With f34, inside /boot/efi/control.txt i simply added:
dtoverlay=gpio-fan,gpiopin=10,temp=65000
Which allowed the fan to start spinning when 65° celsius is reached.
Now the same configuration doesn’t work, the fan’s always on while the temp reported is 45°.
First I tried moving the line from under [pi4] to [all] or even before those two: doesn’t work.
Then I tried changing kernel because I thought config.txt was being skipped. It isn’t: a bad config.txt file doesnt allow the system to boot.
I checked with raspi-config or ways to make it work with fedora to no avail.
I checked with sudo gpioinfo how’s the status and noticed that there was no gpio10, rather an SPI port.
So i went to config.txt with dtparam trying to disable spi all together but no matter the settings, there was no way to have the pin as GPIO10, only SPI.
I moved the blue cable from GPIO10 to 17, updated config.txt: nothing.
gpioinfo was showing GPIO17 as input, with the line
gpio=17=op,dh
I changed it to “output” thinking this was the problem, the fan is always on.
The only command i found working was
sudo gpioset -c gpiochip0 17=0
Without the -c i get the error
gpioset: invalid line value: 'gpiochip0'
There is a gpio-fan file inside /boot/efi/overlays so i think that’s implemented.
With the command
dmesg | grep -i fan
I get nothing.
WIth the command
sudo dmesg | grep gpio
I get
[ 2.161331] pinctrl-bcm2835 fe200000.gpio: GPIO_OUT persistence: no
I’m out of options, anyone can help me?
Thanks!