#include <avr_layout.h>


inline void init(){
  avr = (struct LAYOUT * ) IO_MEMORY_OFFSET; 
}; 

inline void led_on(short value){
  avr->ddrB = SET;
  avr->portB = value;
};

//the input for the led method is the pressed
//key in the input D port
inline void listen(){
   led_on( avr->inD );
};

inline void enable_int(){
	avr->status_reg = (1<<7) ;   //global interruption enable bit
	avr->gen_int_mask = (1<<7) ; //external INT1 enable, software interruption
	avr->portD = (1<<3);         //enable portD int1
  avr->tc_int_mask = (1<<1);   //interrupt generator
};
  //page 34 stop the timer
inline void clock_stop(){
   avr->tc0_control_reg = ( 0<<2 | 0<<1 | 0<<0 );
};
  //page 34 enable the timer clock as CK/1024 
inline void clock_start(){
	//we neet to set the overflow time
  avr->tc0_control_reg = ( (1<<2) | (0<<1) | (1<<0) );
};

	
// interruption handlers 

void __vector_2 (void) __attribute__((signal));
void __vector_2 (void) {
	clock_start();
};
unsigned int timer=0;

void __vector_7 (void) __attribute__((signal));
void __vector_7 (void) {
	//led_on(NONE);
	timer++;
	if(timer == 81){
		timer = 0;
		led_on(LED3);
	}
		
}



/*
MAIN
*/

int main(){

  init();
	clock_stop();
	enable_int();

  while(TRUE);
              
};