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Userspace library to access APU2/3 gpios

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APU2/3 GPIO access library
==========================

This is library for accessing the GPIO's of APU2/3 devices. Currently it
supports accessing the GPIO's controlling the LED1,2,3, MODESW signal and
SIMSWAP signal (apu3 only).

This library could be used as an example.

Required tools to build
-----------------------

* gcc
* cmake

How to compile
--------------

By default compiles statically linked library and some examples.

```
mkdir build
cd build
cmake ..
make
```

Example
-------

After compilation. Examples are in dir `build/example`.
* `blinky` - it blinks the LED2 and LED3 on APU.
* `simswap` - changes the simswap pin value. Usage:
    * `./simswap`   - shows current pin state
    * `./simswap 1` - sets the simswap pin value to 1
    * `./simswap 0` - sets the simswap pin value to 0
* `apu2_gpiod` - a daemon that is only built on OpenBSD
    to be run from rc.securelevel to control the LEDs

Library API
-----------

Short API summary:

* `const char *apu_gpio_version(void)` - returns library version string
* `int apu_gpio_init(void)` - initializes the library and maps the gpio space
* `int apu_gpio_get_dir(unsigned offset)` - gets gpio direction (1 - out, 0 - in)
* `int apu_gpio_set_dir(unsigned offset, unsigned direction)` - sets gpio direction (1 - out, 0 - in)
* `int apu_gpio_get_val(unsigned offset)` - gets gpio state
* `int apu_gpio_set_val(unsigned offset, unsigned value)` - sets gpio value

Issues
-----------

If you have any trouble or find any bug, please report an issue in 
[this location](https://github.com/pcengines/apu2-documentation/issues). To 
create the issue, from the list of available templates select the one, that fits 
best the nature of the issue (bug, feature, question or task) and fill it.

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