#include <avr_layout.hh>

class Keyboard{
  
public:
  Keyboard(){ timer =0;};
  ~Keyboard(){};

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

  inline void led_switch(short value){
    avr->ddrB = SET;
    avr->portB ^= value; //let see if it works
    //if we do not XOR we have to do a AND to resae and a OR to 
    //write the bits : avr->portB |= value; avr->portB &= value;  
  };

  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  
    avr->mcu |= (1<<3) | (1<<2);
  };
  

  //page 34 stop the timer
  inline void clock_stop(){
     avr->tc0_control_reg &= ( 0<<2 | 0<<1 | 0<<0 );
     timer=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) | (1<<0) ;
    avr->tc0_control_reg &=  ~(1<<1);
  };

  inline void key_event() {
    //BUTTON3 Pressed
    //mcu bit 3 and 2 
    //1 0  falling
    //1 1  rising

//    avr->portB ^= 1;//debug
    if (avr->mcu & (1<<2)) {
      avr->mcu &= ~(1<<2);
      clock_stop();
//    avr->portB ^= 2;//debug
      avr->portB |= 8; 
    } else {
      avr->mcu |= (1<<2);
      clock_start();
//   avr->portB ^= 4; //debug
    }
  }

//  private:
  LAYOUT *avr;
  unsigned int timer;
};

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

Keyboard k;

//wrapper
void key_int(){
  k.key_event();
};

void timer_int(){
  k.timer++;
  if(k.timer == 54){
    k.timer = 0;
    k.clock_stop();
    k.avr->portB ^=8;
  }

  k.avr->portB ^= 16;
};
// interruption handlers 

extern "C"{

  void __vector_2 (void) __attribute__((signal));
  void __vector_2 (void) {
    key_int();
  };
  
  void __vector_7 (void) __attribute__((signal));
  void __vector_7 (void) {
    timer_int();
  };

};

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

/*
MAIN
*/

int main(){
  k.init();
  k.led_switch(NONE);
  k.clock_stop();
  k.enable_int();

  while(true);
              
};