t-hmi add touchhandler class

src/TouchHandler.cpp

@@ -0,0 +1,66 @@
+#include "drivers/displays/display.h"
+#include "TouchHandler.h"
+
+// Global variable declaration
+extern unsigned int lowerScreen;
+
+
+TouchHandler::~TouchHandler() {
+}
+
+TouchHandler::TouchHandler(TFT_eSPI& tft, uint8_t csPin, uint8_t irqPin, SPIClass& spi)
+  : tft(tft), csPin(csPin), irqPin(irqPin), spi(spi), lastTouchTime(0),
+  screenSwitchCallback(nullptr), touch(spi, csPin, irqPin) {
+
+}
+
+void TouchHandler::begin(uint16_t xres, uint16_t yres) {
+    spi.begin(TOUCH_CLK, TOUCH_MISO, TOUCH_MOSI);
+    touch.begin(xres, yres);
+}
+
+void TouchHandler::setScreenSwitchCallback(void (*callback)()) {
+  screenSwitchCallback = callback;
+}
+
+uint16_t TouchHandler::isTouched() {
+  // XXX - move touch_x, touch_y to private and min_x, min_y,max_x, max_y
+  uint16_t touch_x, touch_y, code = 0;
+
+  if (touch.pressed()) {
+    touch_x = touch.RawX();
+    touch_y = touch.RawY();
+
+    // Perform actions based on touch coordinates
+    // if (y < y_min + (y_max - y_min) / 4) {
+    if (touch_x < 200 + (1700 - 200) / 4) {
+      // bottom
+      code = 1;
+      if (debounce())
+        lowerScreen = 3 - lowerScreen;
+    } else {
+      // top
+      code = 2;
+      if (debounce() && screenSwitchCallback) {
+        screenSwitchCallback();
+      }
+    }
+
+    if (code) {
+      if (code == 1)
+        Serial.print("Touch bottom\n");
+      else
+        Serial.print("Touch top\n");
+    }
+  }
+  return code;
+}
+
+bool TouchHandler::debounce() {
+  unsigned long currentTime = millis();
+  if (currentTime - lastTouchTime >= 2000) {
+    lastTouchTime = currentTime;
+    return true;
+  }
+  return false;
+}

src/TouchHandler.h

@@ -0,0 +1,30 @@
+#ifndef _TOUCHHANDLER_H_
+#define _TOUCHHANDLER_H_
+
+#include <TFT_eSPI.h>  // TFT display library
+#include <xpt2046.h>   // https://github.com/liangyingy/arduino_xpt2046_library
+
+
+class TouchHandler {
+public:
+  TouchHandler();
+  ~TouchHandler();
+  TouchHandler(TFT_eSPI& tft, uint8_t csPin, uint8_t irqPin, SPIClass& spi);
+  void begin(uint16_t xres, uint16_t yres);
+  uint16_t isTouched();
+  void setScreenSwitchCallback(void (*callback)());
+
+private:
+  bool debounce();
+  TFT_eSPI& tft;
+  XPT2046 touch;
+  uint8_t csPin;
+  uint8_t irqPin;
+  SPIClass& spi;
+  unsigned long lastTouchTime;
+  // unsigned int lower_switch;
+  void (*screenSwitchCallback)();
+};
+
+
+#endif