UCM-iMX95 Yocto Linux: GPIO

Example: controlling pin 2 of header P15

Exporting the pin in sysfs

cd /sys/class/gpio/
echo 517 > export
cd gpio517

Now pin is assigned to sysfs. You can view the newly created entry in gpiochip0 by running:

gpioinfo -c 0

Writing to a pin
Set pin direction to output:

echo out > direction

Set pin value to high or low:

echo 1 > value 
echo 0 > value

Reading from a pin
Set pin direction to input:

echo in > direction

Read the value of the pin from the value file:

cat value