ATmega128: T1A - Switchs e LEDs

/* Pretende-se controlar o estados leds D1...D8 utilizando para isso os interruptores SW. O estados dos leds deve obedecer à seguinte tabela:

Interruptor Activo | Leds Ligados
SW1 | D1, D8
SW2 | D2, D7
SW3 | D3, D6
SW4 | D4, D5
SW6 | LEDs desligados */

#include "C:\Program Files\WinAVR-20080610\avr\include\avr\io.h"


int main(void) {
    /* inicializacao das variaveis */
    unsigned char sw1;

    /* PORTA entrada */
    DDRA = 0x00;
    PORTA = 0x00;

    /* PORTC saida */
    DDRC = 0xFF;
    PORTC = 0xFF;

    /* rotina */
    while(1) {
        sw1 = PINA;

        switch(sw1) {
            case 0xFE: PORTC = 0x7E;break; // sw1: 0b11111110 | 0b01111110
            case 0xFD: PORTC = 0xBD;break; // sw2: 0b11111101 | 0b10111101
            case 0xFB: PORTC = 0xDB;break; // sw3: 0b11111011 | 0b11011011
            case 0xF7: PORTC = 0xE7;break; // sw4: 0b11110111 | 0b11100111
            case 0xDF: PORTC = 0xFF;break; // sw6: 0b11011111 | 0b11111111: reset
        }
    }
}