DS1307.hh

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#ifndef COSA_DS1307_HH
#define COSA_DS1307_HH

#include "Cosa/TWI.hh"
#include "Cosa/IOStream.hh"
#include "Cosa/Time.hh"

class DS1307 : private TWI::Driver {
public:
  union control_t {
    uint8_t as_uint8;           
    struct {                    
      uint8_t rs:2;             
      uint8_t reserved1:2;      
      uint8_t sqwe:1;           
      uint8_t reserved2:2;      
      uint8_t out:1;            
    };

    operator uint8_t()
    {
      return (as_uint8);
    }

    control_t()
    {
      as_uint8 = 0;
    }
  };

  enum Rate {
    RS_1_HZ = 0,
    RS_4096_HZ = 1,
    RS_8192_HZ = 2,
    RS_32768_HZ = 3
  } __attribute__((packed));

  struct timekeeper_t {
    time_t clock;               
    control_t control;          
  };

  const static uint8_t RAM_START = sizeof(timekeeper_t);

  const static uint8_t RAM_END = 0x3f;

  const static uint8_t RAM_MAX = RAM_END - RAM_START + 1;

  DS1307() : TWI::Driver(0x68) {}

  int read(void* ram, uint8_t size = sizeof(time_t), uint8_t pos = 0);

  int write(void* ram, uint8_t size = sizeof(time_t), uint8_t pos = 0);

  bool get_time(time_t& now)
    __attribute__((always_inline))
  {
    return (read(&now) == sizeof(now));
  }

  bool set_time(time_t& now)
    __attribute__((always_inline))
  {
    return (write(&now) == sizeof(now));
  }

  bool enable(Rate rs = RS_1_HZ);

  bool disable();
};

#endif