> For the complete documentation index, see [llms.txt](https://dev.solid-run.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.solid-run.com/marvell/a38x/sbc-platform/a388-other-articles/accessing-gpio-pins-on-clearfog-a388.md).

# Accessing GPIO Pins on ClearFog A388

**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:

```
# 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:

```
#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
```


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