In order for Screen to be able to detect
events from your touch controller, you need to provide a driver for your
touch controller.
Your driver is required to provide the following:
- Provide the required callback functions
- Your driver must provide implementation for the callback functions:
get_coords(), get_contact_id(), and
is_contact_down(). Other callback functions that need to be
implemented depend on the capabilities that you have specfied being supported by your
driver.
- Connect to the Input Events library
-
You need to specify the appropriate callback functions and the
mtouch driver parameters for your touch controller. Once the
callback functions and parameters have been set, you can connect to
the Input Events library by calling the function
mtouch_driver_attach().
- Communicate with the hardware
-
You need to communicate directly with the hardware via the hardware
interface (e.g., I2C, SPI, USB, etc.).
- Implement initialization and cleanup callback functions
- Your driver must provide implementation for the callback functions:
mtouch_driver_init() and
mtouch_driver_fini(). These functions are your driver's
insertion and exit points, respectively, for Screen.
- Disconnect from the Input Events library
-
You need to perform the appropriate cleanup of resources and disconnect
from the Input Events library by calling the function
mtouch_driver_detach().