#include "avr8.h"

class RRInterrupt_KeyBoard {
    private:
    
        AT90S * at90s;
        int count; // Timer/Counter0 Overflow counter
        
    public:
    
        RRInterrupt_KeyBoard ()  {
        
            AT90S * at90s = reinterpret_cast<AT90S *>(0);
            
            //at90s->ddrb = 0xff; // configure as output
	    asm ("out 0x17, %0" : : "r" (0xff));
            //at90s->portb = 0xff; // turn all leds off
	    asm ("out 0x18, %0" : : "r" (0xff));
            //at90s->ddrd = 0x0; // configure as input
	    asm ("out 0x11, %0" : : "r" (0x00));
            
	     //at90s->sreg |= 1<<7; // Global Interrupt enable
	    asm ("out 0x3f, %0" : : "r" (0x80));
            //at90s->gimsk |= 1<<6; // External Interrupt Request 0 enable
	    asm ("out 0x3b, %0" : : "r" (0x40));
            //at90s->timsk |= 1<<1; // Timer/Counter0 Overflow Interrupt enable
	    asm ("out 0x39, %0" : : "r" (0x02));
            //at90s->mcucr |= 0xfe; // the falling edge of INT0 generates an interrupt request
	    asm ("out 0x35, %0" : : "r" (0xfe));
            
            count = 0;
        }
        
        void handleIRQ0 () {
            count = 0;
            if (at90s->mcucr == 0xfe) {
	        //at90s->tccr0 = 0x05; // start Timer/Counter0 with prescale CK/1024
		asm ("out 0x33, %0" : : "r" (0x05));
		//at90s->mcucr |= 0xff; // the rising edge of INT0 generates an interrupt request
		asm ("out 0x35, %0" : : "r" (0xff));
            } else {
	        //at90s->mcucr |= 0xfe; // the falling edge of INT0 generates an interrupt request
		asm ("out 0x35, %0" : : "r" (0xfe));
		//at90s->tccr0 = 0x0; // stop Timer/Counter0
		asm ("out 0x33, %0" : : "r" (0x00));
		//at90s->portb |= 1<<2; // turn off led 2
		asm ("out 0x18, %0" : : "r" (0x04));
            }
        }
        
        void handleTimer0Overflow () {
            count++;
            if (count == 35) {
	        //at90s->portb &= ~(1<<2); // turn on led 2
		asm ("out 0x18, %0" : : "r" (0xfb));
                //at90s->tccr0 = 0x0; // stop Timer/Counter0
		asm ("out 0x33, %0" : : "r" (0x00));
            }
        }
};

RRInterrupt_KeyBoard rri_kb;

int main()
{	
    while(1) {}
    return 0;	
}

extern "C" {

	void EXT_INT0 (void) SIGNAL;
	void TIM0_OVF (void) SIGNAL;
}

void EXT_INT0 (void) {
  rri_kb.handleIRQ0();
}

void TIM0_OVF (void) {
  rri_kb.handleTimer0Overflow();
}