Svenska ElektronikForumet

Kod: Markera allt

const unsigned char knapp[16] = {0x77,0x7B,0x7D,0x7E,0xB7,0xBB,0xBD,0xBE,0xD7,0xDB,0xDD,0xDE,0xE7,0xEB,0xED,0xEE};
const unsigned char ascii[16] = {'1','2','3','A','4','5','6','B','5','6','7','C',0x08,'0',0x0D,'D'}; //declareras globalt

unsigned char get_key()
{
	unsigned char tecken, knapp1, knapp2, pos;

	for(pos=0; pos<16; pos++)
	{
		knapp1 = knapp[pos];
		PORTB = knapp1|PULL_UP;

		knapp2 = PINB;
		knapp2 = PINB;

		if(knapp2 == knapp1)
		{
			tecken = ascii[pos]; //hämtar samma pos i ascii tabellen men den verkar inte funka...
			return tecken;
		}	
	}

	return 0;
}	

Kod: Markera allt

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

#define F_CPU 8000000
#include <util/delay.h>

#define PULL_UP 0x0F

const unsigned char knapp[16] = {0x77,0x7B,0x7D,0x7E,0xB7,0xBB,0xBD,0xBE,0xD7,0xDB,0xDD,0xDE,0xE7,0xEB,0xED,0xEE};
const unsigned char ascii[16] = {'1','2','3','A','4','5','6','B','5','6','7','C',0x08,'0',0x0D,'D'};
unsigned char value, value1;

void init();
unsigned char get_key();

ISR(PCINT0_vect) //interrupt för portB 
{
	cli();

	value = get_key(); //stutsavkodning
	_delay_ms(5);
	value1 = get_key();

	if(value == value1)
		PORTD = value;
	
	sei();

	return;
}


int main()
{
	cli(); //disable interrupt

	init();

	sei(); //enable interrupts
	
	while(1) 	{;}
}

void init()
{
	DDRD = 0xFF; //alla portar utgångar
	PORTD = 0x00; //sätter portarna till 0V
	DDRB = 0xF0; //Ut 4-7 in 0-3
	PORTB = 0x0F; //pullup aktiverat
	
	PCICR = 0x01; //enable pinchange interrupt
	PCMSK0 = 0x0F; //på portB pin 0-3
}

unsigned char get_key()
{
	unsigned char tecken, knapp1, knapp2, pos;

	for(pos=0; pos<16; pos++)
	{
		knapp1 = knapp[pos];
		PORTB = knapp1|PULL_UP;

		knapp2 = PINB;
		knapp2 = PINB;

		if(knapp2 == knapp1)
		{
			tecken = ascii[pos];
			return tecken;
		}	
	}

	return 0;
}