CoreMatrix Button 按键

#include <M5Unified.h>

static void drawButtons(const bool pressed[3])
{
  M5.Display.startWrite();
  M5.Display.fillScreen(TFT_BLACK);

  for (int i = 0; i < 3; ++i) {
    const int x = 1 + i * 5;
    M5.Display.drawRect(x, 3, 4, 10, TFT_WHITE);
    if (pressed[i]) {
      M5.Display.fillRect(x + 1, 4, 2, 8, TFT_WHITE);
    }
  }

  M5.Display.endWrite();
  M5.Display.display();
}

void setup()
{
  auto cfg = M5.config();
  cfg.serial_baudrate = 115200;
  M5.begin(cfg);

  M5.Display.setColorDepth(8);
  M5.Display.setRotation(1);
  M5.Display.setBrightness(128);

  const bool pressed[3] = {false, false, false};
  drawButtons(pressed);
}

void loop()
{
  M5.update();

  const bool pressed[3] = {
    M5.BtnA.isPressed(),
    M5.BtnB.isPressed(),
    M5.BtnC.isPressed(),
  };

  static bool lastPressed[3] = {false, false, false};
  bool changed = false;
  for (int i = 0; i < 3; ++i) {
    if (pressed[i] != lastPressed[i]) {
      changed = true;
      lastPressed[i] = pressed[i];
    }
  }
  if (changed) {
    drawButtons(pressed);
  }

  if (M5.BtnA.wasPressed()) Serial.println("KEY1 pressed");
  if (M5.BtnB.wasPressed()) Serial.println("KEY2 pressed");
  if (M5.BtnC.wasPressed()) Serial.println("KEY3 pressed");

  if (M5.BtnA.wasClicked()) Serial.println("KEY1 clicked");
  if (M5.BtnB.wasClicked()) Serial.println("KEY2 clicked");
  if (M5.BtnC.wasClicked()) Serial.println("KEY3 clicked");

  delay(10);
}