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# Usage — Linux-GPIO
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## Usage
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Any accessed GPIO device need at least read permission (which is enough even
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for writing). Typically, only the root user has access, hence permissions need
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to be set. For instance, for device 0 on a Raspberry Pi (user `pi`) :
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```bash
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$ chown root:pi /dev/gpiochip0
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$ chmod g+r /dev/gpiochip0
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```
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The [javadoc](https://javadoc.io/doc/io.helins/linux-gpio) provide all details.
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Have a look at the [examples](../tree/masterexamples).
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Run an example where `$EXAMPLE` is the name of an example such as
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`AlternatingLeds` :
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```bash
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$ ./gradlew :examples:$EXAMPLE:run
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```
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Run tests :
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```bash
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$ ./gradlew test
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```
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Run tests on the Raspberry Pi 3 (or similar), will test some IO :
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```bash
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$ ./gradlew test -DonRaspberry=true
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``` |
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\ No newline at end of file |
