Miscellany

#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

uint8_t state;
volatile uint8_t ledCount = 0;

void enableAllStops(){
        PORTD |=(1<<PD6)|(1<<PD4);
}
void disableAllStops(){
        PORTD &=~(1<<PD6)&~(1<<PD4);
}
void enableRun(){
}
void disableRun(){
        PORTD &=~(1<<PD5);
}

SIGNAL(SIG_INTERRUPT0){
        ledCount=1;
        //RESET
        if(bit_is_set(PINA,PA0) && state==STOP){
                disableAllStops();
                PORTD |=(1<<PD5);
                state=RUN;
        }
        //SW1
        if(bit_is_set(PINA,PA1) && state==RUN){
                disableRun();
                PORTD |=(1<<PD6);
                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 |= (1<<PD6)|(1<<PD5)|(1<<PD4);
        DDRB |= (1<<PB0);
        DDRA = 0x00; //alla pinnar i porta som input riktning
        PORTD |= (1 << PD2);
        PORTA = 0x00; //pullup 0  pa alla pinnar
        PORTB |=(1<<PB0);
        enableAllStops();
        while (1) {
                if(ledCount==1){
                        PORTB &=~(1<<PB0);
                        _delay_ms(400);
                        ledCount=0;
                }
                else{
                        PORTB |=(1<<PB0);
                }
                return 0;
        }
}