isr.c

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

void display_internal(uint8_t mask, uint8_t c)
{
	uint8_t bm = mask == 0x0F ? 0b00000000 : 0b00001000;
	uint8_t sh = mask == 0x0F ? 0 : 4;
	
	if ((c & mask) >> sh == 0x00) {
		PORTK = 0b00000011 | bm;
		PORTF = 0b11111111;
	}
	else if ((c & mask) >> sh == 0x01) {
		PORTK = 0b00000000 | bm;
		PORTF = 0b00000110;
	}
	else if ((c & mask) >> sh == 0x02) {
		PORTK = 0b00000101 | bm;
		PORTF = 0b11111011;
	}
	else if ((c & mask) >> sh == 0x03) {
		PORTK = 0b00000100 | bm;
		PORTF = 0b11111111;
	}
	else if ((c & mask) >> sh == 0x04) {
		PORTK = 0b00000110 | bm;
		PORTF = 0b11110110;
	}
	else if ((c & mask) >> sh == 0x05) {
		PORTK = 0b00000110 | bm;
		PORTF = 0b11111101;
	}
	else if ((c & mask) >> sh == 0x06) {
		PORTK = 0b00000111 | bm;
		PORTF = 0b11111101;
	}
	else if ((c & mask) >> sh == 0x07) {
		PORTK = 0b00000000 | bm;
		PORTF = 0b00000111;
	}
	else if ((c & mask) >> sh == 0x08) {
		PORTK = 0b00000111 | bm;
		PORTF = 0b11111111;
	}
	else if ((c & mask) >> sh == 0x09) {
		PORTK = 0b00000110 | bm;
		PORTF = 0b11111111;
	}
	else if ((c & mask) >> sh == 0x0A) {
		PORTK = 0b00000111 | bm;
		PORTF = 0b11110111;
	}
	else if ((c & mask) >> sh == 0x0B) {
		PORTK = 0b00000111 | bm;
		PORTF = 0b11111100;
	}
	else if ((c & mask) >> sh == 0x0C) {
		PORTK = 0b00000011 | bm;
		PORTF = 0b11111001;
	}
	else if ((c & mask) >> sh == 0x0D) {
		PORTK = 0b00000101 | bm;
		PORTF = 0b11111110;
	}
	else if ((c & mask) >> sh == 0x0E) {
		PORTK = 0b00000111 | bm;
		PORTF = 0b11111001;
	}
	else if ((c & mask) >> sh == 0x0F) {
		PORTK = 0b00000111 | bm;
		PORTF = 0b11110001;
	}
}

void display(uint8_t c) {
	display_internal(0x0F, c);
	_delay_us(1000);
	display_internal(0xF0, c);
	_delay_us(1000);
}

uint8_t counter = 0;

ISR (INT0_vect) {
	PORTA = ~PINA;
	
	counter++;
}

ISR (INT1_vect) {
	PORTA = ~PINA;
	
	counter--;
}

int main()
{
	// led
	DDRA = 0b11111111;
	PORTA = 0b00000000;
	
	// 7 segment
	DDRK = 0xFF;
	DDRF = 0xFF;
	
	cli();
	EIMSK |= (1 << INT0) | (1 << INT1);
	EICRA |= (1 << ISC01) | (1 << ISC00) | (1 << ISC11) | (1 << ISC10);;
	sei();
	
	display(0x00);
	
	while (1) {
		display(counter);
	}
}