To control on the GPIO pins:
The external GPIOs are available under the /sys/class/gpio folder in Linux.
To control on the GPIO pins you need to calculate the GPIO number XX and run the commands below:
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# Export GPIO XX
echo XX > /sys/class/gpio/export
# Set GPIO pin Direction
echo "out" > /sys/class/gpio/gpioXX/direction
or
echo "in" > /sys/class/gpio/gpioXX/direction
# Set the value of an output pin
echo 1 > /sys/class/gpio/gpioXX/value
or
echo 0 > /sys/class/gpio/gpioXX/value
# Get the value of an input pin
cat > /sys/class/gpio/gpioXX/value
# Unexport GPIO XX
echo XX > /sys/class/gpio/unexport |
This is an example code for accessing the GPIOs on the ClearFog Base/Pro:
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Example#An example for gpio 22 # Export GPIO XX cd /sys/class/gpio/ echo 22 > export cd gpio22/ # Set GPIO pin Direction echo out > direction # Set the value of an output pin echo 0 > value |