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#include <avr/io.h>#include <avr/interrupt.h>int state1;int state2;SIGNAL(SIG_INTERRUPT0){        if ((PINA >> PA0) & 1)!=state1) {                PORTD ^=(1<<PD6);                state1 ^=1;        }        if ((PINA >> PA1) & 1)!=state1) {                PORTD ^=(1<<PD5);                state1 ^=1;        }}int main(void){        state1 = 1;        state2=1;        GICR=0xC0;        MCUCR=0x01;        sei();        DDRD |= (1 << PD6);        DDRD |= (1 << PD5);        PORTD |= (1 << PD2);        PORTA |= (1 << PA0);        PORTA |= (1 << PA1);        while (1) {        }        return 0;}