/*
 * keyboard.c
 *
 * Created: 4/16/2019 4:59:58 PM
 *  Author: dspuser
 */

#define F_CPU 14745600UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "keyboard.h"
#include "digit.h"
#include <stdint.h>

void scan_key(){
	uint8_t row=0,column=0;
	DDRB=0x0F;
	PORTB=0x00;

	while(1){
		do{
			PORTB=PORTB|0x0F;
			row=PORTB|0xF0;
		}while(row==0x00);

		do{
			do{
				//_delay_ms(10);
				row=PORTB&0xF0;
			}while(row==0x00);
			//_delay_ms(20);
			row=PORTB&0xF0;
			}while(row==0x00);
		while(1){
			PORTB=PORTB&0xF0;
			PORTB=PORTB|0x01;
			row=PORTB&0xF0;
			if(row!=0x00){
				column=0;
				break;
			}
			PORTB=PORTB&0xF0;
			PORTB=PORTB|0x02;
			row=PORTB&0xF0;
			if(row!=0x00){
				column=1;
				break;
			}
			PORTB=PORTB&0xF0;
			PORTB=PORTB|0x04;
			row=PORTB&0xF0;
			if(row!=0x00){
				column=2;
				break;
			}
			PORTB=PORTB&0xF0;
			PORTB=PORTB|0x08;
			row=PORTB&0xF0;
			if(row!=0x00){
				column=3;
				break;
			}
		}
	 if(row==0x10){
		 display_digit(keyboard[0][column]);
	 }
	 if(row==0x20){
		 display_digit(keyboard[1][column]);
	 }
	 if(row==0x40){
		 display_digit(keyboard[2][column]);
	 }
	 if(row==0x80){
		 display_digit(keyboard[3][column]);
	 }

	 do{
		 _delay_ms(20);
		 PORTB=PORTB|0x0F;
		 row=PORTB&0xF0;
		 }while(row!=0x00);
	}


}