Debounce.h

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#ifndef DEBOUNCE_H
#define DEBOUNCE_H

template<int PIN, void (*CALLBACK)()>
class Debounce {
public:
  static void setup()
  {
    pinMode(PIN, INPUT_PULLUP);
  }
  static void loop()
  {
    const unsigned int DEBOUNCE = 50;
    int state = digitalRead(PIN);
    while (1) {
      await(digitalRead(PIN) != state);
      unsigned int start = millis();
      if (state) CALLBACK();
      unsigned int ms = millis() - start;
      if (ms < DEBOUNCE) delay(DEBOUNCE - ms);
      state = !state;
    }
  }
};

#endif