ds1307.c

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/*
  CodeVisionAVR C Compiler
  (C) 1998-2005 Pavel Haiduc, HP InfoTech S.R.L.

  Dallas Semiconductors DS1307 I2C Bus Real Time Clock functions
*/

#include <i2c.h>
#include <bcd.h>

unsigned char rtc_read(unsigned char address)
{
unsigned char data;
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_start();
i2c_write(0xd1);
data=i2c_read(0);
i2c_stop();
return data;
}

void rtc_write(unsigned char address,unsigned char data)
{
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_write(data);
i2c_stop();
}

void rtc_init(unsigned char rs,unsigned char sqwe,unsigned char out)
{
rs&=3;
if (sqwe) rs|=0x10;
if (out) rs|=0x80;
i2c_start();
i2c_write(0xd0);
i2c_write(7);
i2c_write(rs);
i2c_stop();
}

void rtc_get_time(unsigned char *hour,unsigned char *min,unsigned char *sec)
{
i2c_start();
i2c_write(0xd0);
i2c_write(0);
i2c_start();
i2c_write(0xd1);
*sec=bcd2bin(i2c_read(1));
*min=bcd2bin(i2c_read(1));
*hour=bcd2bin(i2c_read(0));
i2c_stop();
}

void rtc_set_time(unsigned char hour,unsigned char min,unsigned char sec)
{
i2c_start();
i2c_write(0xd0);
i2c_write(0);
i2c_write(bin2bcd(sec));
i2c_write(bin2bcd(min));
i2c_write(bin2bcd(hour));
i2c_stop();
}

void rtc_get_date(unsigned char *date,unsigned char *month,unsigned char *year)
{
i2c_start();
i2c_write(0xd0);
i2c_write(4);
i2c_start();
i2c_write(0xd1);
*date=bcd2bin(i2c_read(1));
*month=bcd2bin(i2c_read(1));
*year=bcd2bin(i2c_read(0));
i2c_stop();
}

void rtc_set_date(unsigned char date,unsigned char month,unsigned char year)
{
i2c_start();
i2c_write(0xd0);
i2c_write(4);
i2c_write(bin2bcd(date));
i2c_write(bin2bcd(month));
i2c_write(bin2bcd(year));
i2c_stop();
}