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 1uint8_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;        }}