debouncer

gistfile1.txt

class Debouncer {
public:
  int debounce_delay;
  long high_edge_interval;

  long last_transition_at;
  bool last_val;

  bool last_state;
  bool state;

  long last_valid_high_edge_at;
  bool _did_go_high_valid;

  Debouncer(int _debounce_delay=50, int _high_edge_interval=500) {
    debounce_delay = _debounce_delay;
    high_edge_interval = _high_edge_interval;

    last_transition_at = 0;
    last_val = -1;
    last_state = -1;
    state = -1;
  }
    
  void update(bool value) {

    last_state = state;
    if (value != last_val) {
      last_val = value;
      last_transition_at = millis();
    }

    _did_go_high_valid = false;
    if (millis() - last_transition_at > debounce_delay) {
      state = value;
      if (state && !last_state && millis() - last_valid_high_edge_at > high_edge_interval)
        _did_go_high_valid = true;
        last_valid_high_edge_at = millis();
    }
  }

  bool did_go_high_valid() {
    return _did_go_high_valid;
  }

  bool did_change_state() {
    return state != last_state;
  }

  bool get_state() {
    return state;
  }
};