/*
 * Key_Matrix.c
 *
 * Created: 16.05.2012 18:44:37
 *  Author: Röwschan, Raphael, Christoph
 */ 


#include <avr/io.h>

int main(void)

{
	DDRA = 0xff;                                                            // Set PINA0 - PINA7 as OUTPUT;
    PORTA = 0xff;
	
   while(1){
   
			
			DDRB = 0b00001111;      // Set PINB4 - PINB7 as INPUT ;
			
				
			PORTB =0b00001110;      // Set PINB0 as LOW and PIN1 - PIN3 as HIGH;
	
	
				if(!(PINB & (1<<PINB4))){PORTA=0b11000000;}				     // Key  "1";   Display "0";
				   if(!(PINB & (1<<PINB5))){PORTA=0b10011001;}			     // Key  "5";   Display "4";
					   if(!(PINB & (1<<PINB6))){PORTA=0b10000000;}		     // Key  "9";   Display "8";
						    if(!(PINB & (1<<PINB7))){PORTA=0b11000110;}	     // Key "13";   Display "C";
		
			PORTB = 0b00001101;
			
				if(!(PINB & (1<<PINB4))){PORTA=0b11111001;}					 // Key "2";    Display "1";
					if(!(PINB & (1<<PINB5))){PORTA=0b10010010;}				 // Key "6";    Display "5";
						if(!(PINB & (1<<PINB6))){PORTA=0b10010000;}			 // Key "10";   Display "9";
							if(!(PINB & (1<<PINB7))){PORTA=0b10100001;}		 // Key "14";   Display "D";
		
			PORTB = 0b00001011;
		
				if(!(PINB & (1<<PINB4))){PORTA=0b10100100;}					 // Key "3";    Display "2";
					if(!(PINB & (1<<PINB5))){PORTA=0b10000010;}				 // Key "7";    Display "6";
						if(!(PINB & (1<<PINB6))){PORTA=0b10001000;}			 // Key "11";   Display "A";
							if(!(PINB & (1<<PINB7))){PORTA=0b10000110;}		 // Key "15";   Display "E";
		
			PORTB = 0b00000111;
		
				if(!(PINB & (1<<PINB4))){PORTA=0b10110000;}					 // Key "4";    Display "3";
					if(!(PINB & (1<<PINB5))){PORTA=0b11111000;}				 // Key "8";    Display "7";
						if(!(PINB & (1<<PINB6))){PORTA=0b10000011;}			 // Key "12";   Display "B";
							if(!(PINB & (1<<PINB7))){PORTA=0b10001110;}		 // Key "16";   Display "F"; 
		
	       }
		   
		    }