#include <system.h>

// _LVP_OFF disables Low Voltage Programming, enabling use of the RB3 output.
#pragma DATA _CONFIG, _CP_OFF & _PWRTE_OFF & _WDT_OFF & _HS_OSC & _LVP_OFF

#pragma CLOCK_FREQ 20000000

#define a porta.0   // Define porta.0,1.2 as variable a,b,c
#define b porta.1   // These will be used as the input variables
#define c porta.2

void main(void)
{
char i;                     // introduce I as a variable for the flash
                            // - turn portb inputs that we are using into digital mode.
    adcon1 = 0b00000110;    //digital
    trisb = 0x00;           //Output
    trisc = 0x00;           // Output
    trisa = 0xFF;           // Turn Porta A as an Input
           
    while( 1 )
    {
        for(i=0;i!=0;i<<=1){
            portb = i;
            delay_ms( 50 );
        }
        portb = 0;
        delay_ms( 15 );
    
        if(a){
        for(i=0;i!=0;i>>=1) {
            portb = i;
            delay_ms ( 50 );
        }                                                                            
        portb = 0;
        delay_ms ( 50 );
        }
    }
}