#include <avr/io.h>    		

void i2c_write(unsigned char data)
{
  TWDR = data ;
  TWCR = (1<< TWINT)|(1<<TWEN);
  while ((TWCR & (1 <<TWINT)) == 0);
}

//**********************************************************

void i2c_start(void)
{
  TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
  while ((TWCR & (1 << TWINT)) == 0);
}

//**********************************************************

void i2c_stop()
{
  TWCR = (1<< TWINT)|(1<<TWEN)|(1<<TWSTO);
}

//**********************************************************

void i2c_init(void)
{
  TWSR=0x00;			
  TWBR=0x47;			
  TWCR=0x04;			
}

//**********************************************************

int main (void)
{
  i2c_init();	
  i2c_start();			
  i2c_write(0b11010000);	
  i2c_write(0b11110000);	
  i2c_stop();			
  while(1);			
  return 0;
}