First Commit

libraries/Adafruit_TouchScreen/TouchScreen.h

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