ds1307 rtc ram read and write issue

[raman00084]

the s1307 rtc has 56x8 ram. please send sample program for writing and reading in ram. i am using pic ccs complier
kindly send sample program are algorithim

 

[Surender Reddy]

Here is sample code for pic18f by using C18 compiler. Before this, once go through the ds1307 data sheet and pic i2c registers
How to start & stop i2c.......

void  rtc_setTime()
{
//i2c_Wait();
i2c_start();
i2c_write(0xa2);
i2c_write(0x02);
i2c_write (0x00) ; //set sec
i2c_write( 0x00);  //min
i2c_write(0x10);   //hou      10:59:00;
i2c_stop();
}
void  rtc_getTime()
{
i2c_Wait();
i2c_start ( ) ; //transmit  START  condition

i2c_write (0xa2) ;
i2c_write (0x02);
i2c_stop();

i2c_start ( ) ;
i2c_write(0xa3);

seconds =  i2c_read(1) ;
minutes =  i2c_read(1) ;
hours  =  i2c_read(0);
i2c_stop ( ) ;

seconds=seconds&0x7f;
minutes =minutes &0x7f;
hours  = hours &0x3f;

  seconds  =  ((seconds & 0xf0) >> 4)*10 + (seconds & 0x0F);  // Transform seconds
  minutes  =  ((minutes & 0xf0) >> 4)*10 + (minutes & 0x0F);  // Transform minutes
  hours    =  ((hours & 0xf0)  >> 4)*10  + (hours & 0x0F);    // Transform hours

hexmin=minutes;
  LCDCmd(0xCC);
  LCDWriteInt( seconds,2);
    LCDCmd(0xCB);
  LCDWriteString(":");
  LCDCmd(0xC9);
  LCDWriteInt( minutes,2);
  LCDCmd(0xC8);
  LCDWriteString(":");
  LCDCmd(0xC6);
  LCDWriteInt( hours,2);
}