81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
// Touch screen library with X Y and Z (pressure) readings as well
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// as oversampling to avoid 'bouncing'
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// (c) ladyada / adafruit
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// Code under MIT License
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#ifndef _ADAFRUIT_TOUCHSCREEN_H_
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#define _ADAFRUIT_TOUCHSCREEN_H_
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#include <stdint.h>
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#if (defined(__AVR_ATmega328P__) || defined(__AVR_ATmega32U4__) || \
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defined(TEENSYDUINO) || defined(__AVR_ATmega2560__) || \
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defined(__AVR_ATmega4809__)) && \
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!defined(__IMXRT1062__)
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typedef volatile uint8_t RwReg;
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#elif defined(ARDUINO_STM32_FEATHER)
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typedef volatile uint32 RwReg;
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#elif defined(NRF52_SERIES) || defined(ESP32) || defined(ESP8266) || \
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defined(ARDUINO_ARCH_STM32) || defined(__IMXRT1062__)
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typedef volatile uint32_t RwReg;
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#else
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typedef volatile uint32_t RwReg;
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#endif
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#if defined(__AVR__) || defined(TEENSYDUINO) || defined(ARDUINO_ARCH_SAMD)
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#define USE_FAST_PINIO
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#endif
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/** Object that encapsulates the X,Y, and Z/pressure measurements for a touch
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* event. */
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class TSPoint {
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public:
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TSPoint(void);
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TSPoint(int16_t x, int16_t y, int16_t z);
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bool operator==(TSPoint);
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bool operator!=(TSPoint);
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int16_t x, ///< state variable for the x value
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y, ///< state variable for the y value
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z; ///< state variable for the z value
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};
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/** Object that controls and keeps state for a touch screen. */
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class TouchScreen {
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public:
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/**
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* @brief Construct a new Touch Screen object
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*
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* @param xp X+ pin. Must be an analog pin
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* @param yp Y+ pin. Must be an analog pin
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* @param xm X- pin. Can be a digital pin
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* @param ym Y- pin. Can be a digital pin
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* @param rx The resistance in ohms between X+ and X- to calibrate pressure
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* sensing
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*/
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TouchScreen(uint8_t xp, uint8_t yp, uint8_t xm, uint8_t ym, uint16_t rx);
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/**
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* @brief **NOT IMPLEMENTED** Test if the screen has been touched
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*
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* @return true : touch detected false: no touch detected
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*/
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bool isTouching(void);
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uint16_t pressure(void);
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int readTouchY();
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int readTouchX();
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TSPoint getPoint();
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int16_t pressureThreshhold; ///< Pressure threshold for `isTouching`
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private:
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uint8_t _yp, _ym, _xm, _xp;
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uint16_t _rxplate;
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#if defined(USE_FAST_PINIO)
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volatile RwReg *xp_port, *yp_port, *xm_port, *ym_port;
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RwReg xp_pin, xm_pin, yp_pin, ym_pin;
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#endif
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};
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#endif
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