Clock.hh

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#ifndef COSA_CLOCK_HH
#define COSA_CLOCK_HH

#include "Cosa/Types.h"
#include "Cosa/Job.hh"

class Clock : public Job::Scheduler {
public:
  Clock() :
    Job::Scheduler(),
    m_msec(0),
    m_sec(0UL),
    m_cal(0)
  {}

  virtual uint32_t time()
  {
    uint32_t res;
    synchronized res = m_sec;
    return (res);
  }

  void time(uint32_t sec)
  {
    synchronized {
      m_msec = 0;
      m_sec = sec;
    }
  }

  uint32_t await()
  {
    uint32_t start = time();
    uint32_t now;
    while (1) {
      now = time();
      if (now != start) return (now);
      yield();
    }
  }

  void tick(uint16_t ms)
  {
    synchronized {
      m_msec += ms;
      if (m_msec >= 1000) {
        do {
          m_msec -= 1000 + m_cal;
          m_sec += 1;
        } while (m_msec >= 1000);
        dispatch();
      }
    }
  }

  void calibration(int16_t ms)
  {
    synchronized m_cal = ms;
  }

  int16_t calibration()
  {
    int16_t res;
    synchronized res = m_cal;
    return (res);
  }

  void adjust(int16_t ms)
  {
    synchronized m_cal += ms;
  }

protected:
  int16_t m_msec;               
  uint32_t m_sec;               
  int16_t m_cal;                
};
#endif