#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdint.h>
#include <avr/sfr_defs.h>
#include <util/delay.h>
#define F_CPU 4000000
#define STOP 0
#define RUN 1
#define OUTPUT 1
#define INPUT 0

volatile uint8_t state;
volatile uint8_t ledCount = 0;

void enableAllStops(){
        PORTB |=(1<<PB0)|(1<<PB1)|(1<<PB2)|(1<<PB3);
}
void disableAllStops(){
        PORTB &=~(1<<PB0)&~(1<<PB1)&~(1<<PB2)&~(1<<PB3);
}
void enableRun(){
        PORTD |=(1<<PD4);
}
void disableRun(){
        PORTD &=~(1<<PD4);
}
void enableMCURunning(){
        PORTD |=(1<<PD5);
}

SIGNAL(SIG_INTERRUPT0){
        ledCount=1;
        //RESET
        if(bit_is_set(PINC,PC6) && state==STOP){
                enableRun();
                disableAllStops();
                //PORTD |=(1<<PD4);
                state=RUN;
        }
        //SW1
        if(bit_is_set(PINC,PC5) && state==RUN){
                PORTD &=~(1<<PD4);
                disableRun();
                PORTB |=(1<<PB0);
                state=STOP;
        }
        //SW2
        if(bit_is_set(PINA,PA2) && state==RUN){
                disableRun();
                PORTD |=(1<<PD4);
                state=STOP;
        }
}


int main(void){

        state=STOP;
        GICR=0xC0;
        MCUCR=0x01;
        sei();
        DDRD |= (OUTPUT<<PD6)|(OUTPUT<<PD5)|(OUTPUT<<PD4)|(OUTPUT<<PD7);
        DDRB |= (OUTPUT<<PB0)|(OUTPUT<<PB1)|(OUTPUT<<PB2)|(OUTPUT<<PB3);
        DDRA = (INPUT << PA0 | INPUT << PA1 |INPUT << PA2 |INPUT << PA3 |INPUT << PA4 |INPUT << PA5 |INPUT << PA6 |INPUT << PA7);
        DDRC = 0x00; //PORTC == INPUT PORT
        //      PORTD &=~(1 << PD2);
        PORTA = 0x00; //pullup 0  pa alla pinnar
        PORTC = 0xFF;

        enableMCURunning();
        enableAllStops();
        disableRun();
        while (1) {
        }
        return 0;
}