Roadrunner technical documentation
Inside this directory there are two directories called:
To manage a GPIO line you have to know its kernel ID. The Kernel IDs of any Acme Systems SoM are available on:
Check the port available by typing this command:
sudo less /sys/kernel/debug/pinctrl/fc038000.pinctrl-atmel_pinctrl/pinconf-pins
The Microchip chips have the GPIO lines organized by 32 bit port called PA,PB, etc.
Before set or read a port you have to export it. Follow an example on how to set, reset and read the port PA1 (Kernel ID 1) from the command line:
Set the line status of GPIO line PA1
sudo sh -c "echo 1 > /sys/class/gpio/export" sudo sh -c "echo out > /sys/class/gpio/PA1/direction" sudo sh -c "echo 1 > /sys/class/gpio/PA1/value"
Reset the line status of GPIO line PA1
sudo sh -c "echo 0 > /sys/class/gpio/PA1/value"
Read the line status of GPIO line PA1
sudo sh -c "echo in > /sys/class/gpio/PA1/direction" cat /sys/class/gpio/PA1/value
The official documentation about the GPIO Sysfs interface is available on: