forked from Bodmer/TFT_eSPI
Bodmer
8209c00316
Added 24 bit colour handling alphaBlend to reduce precision loss in multiple blend stages (e.g. in 2D colour gradients). Added option for alpha dither to reduce colour banding in gradients with 16 bit colours. Get rid of compile warnings.
38 lines
2.0 KiB
C++
38 lines
2.0 KiB
C++
// Coded by Bodmer 10/2/18, see license in root directory.
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// This is part of the TFT_eSPI class and is associated with the Touch Screen handlers
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public:
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// Get raw x,y ADC values from touch controller
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uint8_t getTouchRaw(uint16_t *x, uint16_t *y);
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// Get raw z (i.e. pressure) ADC value from touch controller
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uint16_t getTouchRawZ(void);
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// Convert raw x,y values to calibrated and correctly rotated screen coordinates
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void convertRawXY(uint16_t *x, uint16_t *y);
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// Get the screen touch coordinates, returns true if screen has been touched
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// if the touch cordinates are off screen then x and y are not updated
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uint8_t getTouch(uint16_t *x, uint16_t *y, uint16_t threshold = 600);
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// Run screen calibration and test, report calibration values to the serial port
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void calibrateTouch(uint16_t *data, uint32_t color_fg, uint32_t color_bg, uint8_t size);
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// Set the screen calibration values
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void setTouch(uint16_t *data);
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private:
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// Legacy support only - deprecated TODO: delete
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void spi_begin_touch();
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void spi_end_touch();
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// Handlers for the touch controller bus settings
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inline void begin_touch_read_write() __attribute__((always_inline));
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inline void end_touch_read_write() __attribute__((always_inline));
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// Private function to validate a touch, allow settle time and reduce spurious coordinates
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uint8_t validTouch(uint16_t *x, uint16_t *y, uint16_t threshold = 600);
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// Initialise with example calibration values so processor does not crash if setTouch() not called in setup()
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uint16_t touchCalibration_x0 = 300, touchCalibration_x1 = 3600, touchCalibration_y0 = 300, touchCalibration_y1 = 3600;
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uint8_t touchCalibration_rotate = 1, touchCalibration_invert_x = 2, touchCalibration_invert_y = 0;
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uint32_t _pressTime; // Press and hold time-out
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uint16_t _pressX, _pressY; // For future use (last sampled calibrated coordinates)
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