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#include<avr/io.h>
#include<avr/interrupt.h>
//#include<avr/delay.h>
#define F_CPU 1000000U;

volatile char x;
volatile char i;

ISR(INT0_vect){
	PORTC=x;
	/*
		if(i==4){
			if(x == 0b00001110)PORTB = 0x00; //0
			if(x == 0b00001101)PORTB = 0x20; //4
			if(x == 0b00001011)PORTB = 0x10; //8
			if(x == 0b00000111)PORTB = 0x30; //12
		}
		if(i==5){
			if(x == 0b00001110)PORTB = 0x80; //1
			if(x == 0b00001101)PORTB = 0xA0; //5
			if(x == 0b00001011)PORTB = 0x90; //9
			if(x == 0b00000111)PORTB = 0xB0; //13
		}
		if(i==6){
			if(x == 0b00001110)PORTB = 0x40; //2
			if(x == 0b00001101)PORTB = 0x60; //6
			if(x == 0b00001011)PORTB = 0x50; //10
			if(x == 0b00000111)PORTB = 0x70; //14
		}
		if(i==7){
			if(x == 0b00001110)PORTB = 0xC0; //3
			if(x == 0b00001101)PORTB = 0xE0; //7
			if(x == 0b00001011)PORTB = 0xD0; //11
			if(x == 0b00000111)PORTB = 0xf0; //15
		}
*/


}


int main(void){
    DDRA = 0xF0;
    DDRC = 0xFF;

	GICR|= (1<<INT0);
	//MCUCR |= (1<<ISC00) | (1<<ISC01);
	sei();

char x;
	PORTC=0;
	while(1){
	for (i= 4 ; i<8 ; i++){
		PORTA = ~(_BV(i));
		//_delay_ms(1);
		x = PINA;

		/*
		if(i==4){
			if(x == 0b00001110)PORTB = 0x00; //0
			if(x == 0b00001101)PORTB = 0x20; //4
			if(x == 0b00001011)PORTB = 0x10; //8
			if(x == 0b00000111)PORTB = 0x30; //12
		}
		if(i==5){
			if(x == 0b00001110)PORTB = 0x80; //1
			if(x == 0b00001101)PORTB = 0xA0; //5
			if(x == 0b00001011)PORTB = 0x90; //9
			if(x == 0b00000111)PORTB = 0xB0; //13
		}
		if(i==6){
			if(x == 0b00001110)PORTB = 0x40; //2
			if(x == 0b00001101)PORTB = 0x60; //6
			if(x == 0b00001011)PORTB = 0x50; //10
			if(x == 0b00000111)PORTB = 0x70; //14
		}
		if(i==7){
			if(x == 0b00001110)PORTB = 0xC0; //3
			if(x == 0b00001101)PORTB = 0xE0; //7
			if(x == 0b00001011)PORTB = 0xD0; //11
			if(x == 0b00000111)PORTB = 0xf0; //15
		}
		*/
	}

	}
}