#include <avr/io.h>    			

void i2c_initSlave(unsigned char slaveAddress)
{
  TWCR = 0x04;				
  TWAR = slaveAddress;			
  TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWEA);
}

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

unsigned char i2c_receive(unsigned char isLast)
{
  if (isLast == 0)		
    TWCR = (1<< TWINT)|(1<<TWEN)|(1<<TWEA);
  else				
    TWCR = (1<< TWINT)|(1<<TWEN);

  while ((TWCR & (1 <<TWINT))==0);	
  return (TWDR);
}

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

void i2c_listen()
{
  while ((TWCR & (1 <<TWINT))==0);	
}

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

int main (void)
{
  DDRA = 0xFF;
  i2c_initSlave(0x10);		
			
				
  i2c_listen();			
  PORTA = i2c_receive(1);	
  while(1);			
  return 0;
}