PIC16F877A, Phase Test

#include <htc.h>
#include <pic16f877a.h>
#include <stdio.h>
#define _XTAL_FREQ 20000000

void wait_for_one_press( )
{
    while(!RB5);
    __delay_ms(250);
    while(RB5); //wait for one press, detect Pin B5
    __delay_ms(250);
}

//--Delay Function--
void delay_ms (unsigned long int ms)
{
    do
    {
        __delay_ms(1); //Delay for 1ms
    }
    while (ms--);
}

//--Main Funtion --
void main (void)
{
    unsigned int delay;
    TRISA=0x01; // Set PORT A0 as an INPUT
    TRISB=0x20; // Set PORT B5 as an INPUT
    TRISC=0xF0; // Set PORT C7-C4 as INPUT / PORT C3-C0 as OUTPUT
    ADCON1=0b01001110;  //Set ADFM (bit 7 of ADCON1) to 0 for left justified
                        //Only RA0 is selected as analog input
    ADCON0=0b11000001;

    wait_for_one_press( );

    while (1)
    {
        ADCON0=ADCON0|1;
        GO = 1; //Start A/D Conversion
        while(GO==1); //Wait end of conversion (conversion complete)
        delay = ADRESH;

        PORTC=2;
        delay_ms(delay);
        PORTC=4;
        delay_ms(delay);
        PORTC=6;
        delay_ms(delay);
        PORTC=8;
        delay_ms(delay);
        PORTC=6;
        delay_ms(delay);
        PORTC=4;
        delay_ms(delay);
        PORTC=2;
        delay_ms(delay);
    }
} //End of Program