PCINT7Seg.c

/*
 * PCINT7Seg.c
 *
 * Created: 30/4/2561 21:44:33
 * Author : peath
 */ 

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

const unsigned char LOOKUPTB[] = {
	0b00111111,
	0b00000110,
	0b01011011,
	0b01001111,
	0b01100110,
	0b01101101,
	0b01111101,
	0b00000111,
	0b01111111,
	0b01101111,
	0b01110111,
	0b01111100,
	0b00111001,
	0b01011110,
	0b01111001,
	0b01110001
};

void update7Seg() {
	unsigned char num = (PINB & 0b00111110) >> 1;
	
	unsigned char unit = num % 10;
	unsigned char tenth = num / 10;
	
	PORTC = ~LOOKUPTB[tenth];
	PORTD = ~LOOKUPTB[unit];
}

ISR(PCINT0_vect) {
	update7Seg();
}

int main(void)
{
  // DipSW is at PB1-5 = PCINT1-5
	DDRB = 0b00000000;
	// Enable pull-up resistor (optional)
	PORTB = 0b00111110;
	
	// 7-seg is at PD0-6 & PC0-6
	DDRC = 0b01111111;
	DDRD = 0b01111111;

	// Enable PCINT0
	PCICR = (1 << PCIE0);
	// Care about PCINT1-5
	PCMSK0 = 0b00111110;

	update7Seg();
	
	sei();
	
    while (1) 
    {
    }
}