interrupts-16-keys.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;
	}
}

ISR (INT3_vect) {
	switch (PORTB) {
		case 0b1101:
		    display_internal(0xF, 0x1);
			break;
		case 0b0111:
		    display_internal(0xF, 0x2);
			break;
		case 0b1011:
		    display_internal(0xF, 0x3);
			break;
		case 0b1110:
		    display_internal(0xF, 0xA);
			break;
	}
}

ISR (INT2_vect) {
	switch (PORTB) {
		case 0b1101:
		    display_internal(0xF, 0x4);
			break;
		case 0b0111:
		    display_internal(0xF, 0x5);
			break;
		case 0b1011:
		    display_internal(0xF, 0x6);
			break;
		case 0b1110:
		    display_internal(0xF, 0xB);
			break;
	}
}

ISR (INT1_vect) {
	switch (PORTB) {
		case 0b1101:
		    display_internal(0xF, 0x7);
			break;
		case 0b0111:
		    display_internal(0xF, 0x8);
			break;
		case 0b1011:
		    display_internal(0xF, 0x9);
			break;
		case 0b1110:
		    display_internal(0xF, 0xC);
			break;
	}
}

ISR (INT0_vect) {
	switch (PORTB) {
		case 0b1101:
		    display_internal(0xF, 0x0);
			break;
		case 0b0111:
		    display_internal(0xF, 0xF);
			break;
		case 0b1011:
		    display_internal(0xF, 0xE);
			break;
		case 0b1110:
		    display_internal(0xF, 0xD);
			break;
	}
}

int main()
{
	// 7 segment
	DDRK = 0xFF;
	DDRF = 0xFF;
	
	// init keyboard
	DDRB = 0xFF;
	DDRD = 0x00;

	// keyboard interrupts
	cli();
	EIMSK |= (1 << INT0) | (1 << INT1) | (1 << INT2) | (1 << INT3);
	EICRA |= (1 << ISC01) | (1 << ISC11) | (1 << ISC21) | (1 << ISC31);
	sei();
	
	// sweep and display
	while (1) {
		PORTB = 0b0111;
		for (int i = 0; i < 5000; i++);
		PORTB = 0b1011;
		for (int i = 0; i < 5000; i++);
		PORTB = 0b1101;
		for (int i = 0; i < 5000; i++);
		PORTB = 0b1110;
		for (int i = 0; i < 5000; i++);
	}
}