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#include <../Wire/Wire.h>
#include "DS1307.h"
DS1307::DS1307()
{
Wire.begin();
}
DS1307 RTC=DS1307();
// PRIVATE FUNCTIONS
// Aquire data from the RTC chip in BCD format
// refresh the buffer
void DS1307::read(void)
{
// use the Wire lib to connect to tho rtc
// reset the resgiter pointer to zero
Wire.beginTransmission(DS1307_CTRL_ID);
Wire.write( (unsigned char )0 );
Wire.endTransmission();
// request the 7 bytes of data (secs, min, hr, dow, day, mth, yr)
Wire.requestFrom(DS1307_CTRL_ID, 7);
for(int i=0; i<7; i++)
{
// store data in raw bcd format
rtc_bcd[i]=Wire.read();
}
}
// update the data on the IC from the bcd formatted data in the buffer
void DS1307::save(void)
{
Wire.beginTransmission(DS1307_CTRL_ID);
Wire.write( (unsigned char)0 ); // reset register pointer
for(int i=0; i<7; i++)
{
Wire.write(rtc_bcd[i]);
}
Wire.endTransmission();
}
// PUBLIC FUNCTIONS
void DS1307::get(int *rtc, boolean refresh) // Aquire data from buffer and convert to int, refresh buffer if required
{
if(refresh) read();
for(int i=0;i<7;i++) // cycle through each component, create array of data
{
rtc[i]=get(i, 0);
}
}
int DS1307::get(int c, boolean refresh) // aquire individual RTC item from buffer, return as int, refresh buffer if required
{
if(refresh) read();
int v=-1;
switch(c)
{
case DS1307_SEC:
v=(10*((rtc_bcd[DS1307_SEC] & DS1307_HI_SEC)>>4))+(rtc_bcd[DS1307_SEC] & DS1307_LO_BCD);
break;
case DS1307_MIN:
v=(10*((rtc_bcd[DS1307_MIN] & DS1307_HI_MIN)>>4))+(rtc_bcd[DS1307_MIN] & DS1307_LO_BCD);
break;
case DS1307_HR:
v=(10*((rtc_bcd[DS1307_HR] & DS1307_HI_HR)>>4))+(rtc_bcd[DS1307_HR] & DS1307_LO_BCD);
break;
case DS1307_DOW:
v=rtc_bcd[DS1307_DOW] & DS1307_LO_DOW;
break;
case DS1307_DAY:
v=(10*((rtc_bcd[DS1307_DAY] & DS1307_HI_DAY)>>4))+(rtc_bcd[DS1307_DAY] & DS1307_LO_BCD);
break;
case DS1307_MTH:
v=(10*((rtc_bcd[DS1307_MTH] & DS1307_HI_MTH)>>4))+(rtc_bcd[DS1307_MTH] & DS1307_LO_BCD);
break;
case DS1307_YR:
v=(10*((rtc_bcd[DS1307_YR] & DS1307_HI_YR)>>4))+(rtc_bcd[DS1307_YR] & DS1307_LO_BCD)+DS1307_BASE_YR;
break;
} // end switch
return v;
}
void DS1307::set(int c, int v) // Update buffer, then update the chip
{
switch(c)
{
case DS1307_SEC:
if(v<60 && v>-1)
{
//preserve existing clock state (running/stopped)
int state=rtc_bcd[DS1307_SEC] & DS1307_CLOCKHALT;
rtc_bcd[DS1307_SEC]=state | (((v / 10)<<4) + (v % 10));
}
break;
case DS1307_MIN:
if(v<60 && v>-1)
{
rtc_bcd[DS1307_MIN]=((v / 10)<<4) + (v % 10);
}
break;
case DS1307_HR:
// TODO : AM/PM 12HR/24HR
if(v<24 && v>-1)
{
rtc_bcd[DS1307_HR]=((v / 10)<<4) + (v % 10);
}
break;
case DS1307_DOW:
if(v<8 && v>-1)
{
rtc_bcd[DS1307_DOW]=v;
}
break;
case DS1307_DAY:
if(v<31 && v>-1)
{
rtc_bcd[DS1307_DAY]=((v / 10)<<4) + (v % 10);
}
break;
case DS1307_MTH:
if(v<13 && v>-1)
{
rtc_bcd[DS1307_MTH]=((v / 10)<<4) + (v % 10);
}
break;
case DS1307_YR:
if(v<13 && v>-1)
{
rtc_bcd[DS1307_YR]=((v / 10)<<4) + (v % 10);
}
break;
} // end switch
save();
}
void DS1307::stop(void)
{
// set the ClockHalt bit high to stop the rtc
// this bit is part of the seconds byte
rtc_bcd[DS1307_SEC]=rtc_bcd[DS1307_SEC] | DS1307_CLOCKHALT;
save();
}
void DS1307::start(void)
{
// unset the ClockHalt bit to start the rtc
// this bit is part of the seconds byte
rtc_bcd[DS1307_SEC]=rtc_bcd[DS1307_SEC] & ~DS1307_CLOCKHALT;
save();
}
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