As far as implementing a new touch driver is concerned. Here's the header file for TouchController.hpp. You can implement init code in init() if you want, or not. It'll get called. TouchGFX HAL will call sampleTouch() on whatever concrete implementation of TouchController is compiled.
#ifndef TOUCHCONTROLLER_HPP
#define TOUCHCONTROLLER_HPP
#include <touchgfx/hal/Types.hpp>
namespace touchgfx
{
/**
* @class TouchController TouchController.hpp platform/driver/touch/TouchController.hpp
*
* @brief Basic Touch Controller interface.
*
* Basic Touch Controller interface.
*/
class TouchController
{
public:
virtual ~TouchController()
{ }
/**
* @fn virtual void TouchController::init() = 0;
*
* @brief Initializes touch controller.
*
* Initializes touch controller.
*/
virtual void init() = 0;
/**
* @fn virtual bool TouchController::sampleTouch(int32_t& x, int32_t& y) = 0;
*
* @brief Checks whether the touch screen is being touched, and if so, what coordinates.
*
* Checks whether the touch screen is being touched, and if so, what coordinates.
*
* @param [out] x The x position of the touch
* @param [out] y The y position of the touch
*
* @return True if a touch has been detected, otherwise false.
*/
virtual bool sampleTouch(int32_t& x, int32_t& y) = 0;
};
} // namespace touchgfx
#endif // TOUCHCONTROLLER_HPP
If we take the touch controller from the STM32F769-DISCO kit, you can see here that we're simply:
- Evaluating if touch is detected or not.
- If yes, read and set the current state of x and y and return true/false for touch/no touch.
void OTM8009TouchController::init()
{
BSP_TS_Init(BSP_LCD_GetXSize(), BSP_LCD_GetYSize());
}
bool OTM8009TouchController::sampleTouch(int32_t& x, int32_t& y)
{
TS_StateTypeDef state;
BSP_TS_GetState(&state);
if (state.touchDetected)
{
x = state.touchX[0];
y = state.touchY[0];
return true;
}
return false;
}
A lot of the logic is hidden inside BSP_TS_GetState() in this case. You'll just roll your own.
/Martin
