Button.h

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#ifndef BUTTON_H
#define BUTTON_H

#include "GPIO.h"

template<BOARD::pin_t PIN, uint16_t DEBOUNCE = 50>
class Button {
public:
  Button() :
    m_timestamp(0),
    m_state(true)
  {
    m_pin.input().pullup();
  }

  bool ischanged()
  {
    // Check if debounce time limit has elapsed
    if (millis() - m_timestamp < DEBOUNCE) return (false);
    m_timestamp = millis();

    // Check for the pin state has changed
    bool state = m_pin;
    if (state == m_state) return (false);
    m_state = state;
    return (true);
  }

  bool read()
  {
    return (m_state);
  }

  operator bool()
    __attribute__((always_inline))
  {
    return (read());
  }

  uint16_t timestamp()
  {
    return (m_timestamp);
  }

protected:
  GPIO<PIN> m_pin;

  uint16_t m_timestamp;

  bool m_state;
};

#endif