RTC.h

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#ifndef HARDWARE_AVR_RTC_H
#define HARDWARE_AVR_RTC_H

class RTC {
public:
  RTC() :
    m_millis(0),
    m_time(0)
  {}

  bool tick()
  {
    uint16_t now = millis();
    if (now - m_millis < 1000) return (false);
    uint8_t sreg = SREG;
    __asm__ __volatile__("cli" ::: "memory");
    m_time += 1;
    m_millis = now;
    SREG = sreg;
    __asm__ __volatile__("" ::: "memory");
    return (true);
  }

  time_t get_time()
  {
    uint8_t sreg = SREG;
    __asm__ __volatile__("cli" ::: "memory");
    time_t res = m_time;
    SREG = sreg;
    __asm__ __volatile__("" ::: "memory");
    return (res);
  }

  void set_time(time_t time)
  {
    uint8_t sreg = SREG;
    __asm__ __volatile__("cli" ::: "memory");
    m_time = time;
    SREG = sreg;
    __asm__ __volatile__("" ::: "memory");
  }

  void get_time(struct tm& now)
  {
    time_t time = get_time();
    gmtime_r(&time, &now);
  }

  void set_time(struct tm& now)
  {
    extern long __utc_offset;
    set_time(mktime(&now) + __utc_offset);
  }

protected:
  volatile uint16_t m_millis;

  volatile time_t m_time;
};

#endif