A simple PIC shift register

/*
 * File:   shift.c
 * Author: Nathan Campos <[email protected]>
 *
 * Created on March 16, 2013, 5:31 PM
 */

#include <pic.h>
#include <pic12f683.h>
#include <stdint.h>

#define _XTAL_FREQ 4000000

// GP0 -> data
// GP1 -> latch
// GP2 -> clock

uint8_t sGPIO = 0;


/*void clear_shift_register() {
    LATCH = 0;
    DATA = 0;

    CLOCK = 1;
    CLOCK = 0;
    CLOCK = 1;
    CLOCK = 0;
    CLOCK = 1;
    CLOCK = 0;
    CLOCK = 1;
    CLOCK = 0;
    CLOCK = 1;
    CLOCK = 0;
    CLOCK = 1;
    CLOCK = 0;
    CLOCK = 1;
    CLOCK = 0;
    CLOCK = 1;
    CLOCK = 0;

    LATCH = 1;
}*/

// GP0 -> data
// GP1 -> latch
// GP2 -> clock
void main(void) {
    TRISIO = 0x00;
    //clear_shift_register();

    while (1) {
        sGPIO ^= 0b000001;
        GPIO = sGPIO;
        sGPIO ^= 0b000100;
        GPIO = sGPIO;

        sGPIO ^= 0b000000;
        GPIO = sGPIO;
        sGPIO ^= 0b000100;
        GPIO = sGPIO;

        sGPIO ^= 0b000001;
        GPIO = sGPIO;
        sGPIO ^= 0b000100;
        GPIO = sGPIO;

        sGPIO ^= 0b000001;
        GPIO = sGPIO;
        sGPIO ^= 0b000110;
        GPIO = sGPIO;

        __delay_ms(500);
    }
}