blob: ecb4981002358a6342b6c569e2b341c9c0438696 [file] [log] [blame]
Creating New HAL Interfaces
A HAL always includes header file with function declarations for the HAL
functionality in ``/hw/hal/include/hal``. The first argument of all
functions in the interface typically include the virtual device\_id of
the device you are controlling.
For example, in
```hal_gpio.h`` <>`__
the device enumeration is the first argument to most methods and called
.. code-block:: console
void hal_gpio_write(int pin, int val);
The device\_id (in this case called ``pin``) is not a physical device
(actual hardware pin), but a virtual pin which is defined by the
implementation of the HAL (and documented in the implementation of the