PIC problem 101

config.h

/* Microchip Technology Inc. and its subsidiaries.  You may use this software 
 * and any derivatives exclusively with Microchip products. 
 * 
 * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS".  NO WARRANTIES, WHETHER 
 * EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED 
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 * PARTICULAR PURPOSE, OR ITS INTERACTION WITH MICROCHIP PRODUCTS, COMBINATION 
 * WITH ANY OTHER PRODUCTS, OR USE IN ANY APPLICATION. 
 *
 * IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, 
 * INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND 
 * WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS 
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 * IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF 
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/* 
 * File:   
 * Author: 
 * Comments:
 * Revision history: 
 */

// This is a guard condition so that contents of this file are not included
// more than once.  
#ifndef XC_HEADER_TEMPLATE_H
#define	XC_HEADER_TEMPLATE_H

#include <xc.h> // include processor files - each processor file is guarded.  

// TODO Insert appropriate #include <>

// TODO Insert C++ class definitions if appropriate

// TODO Insert declarations

// Comment a function and leverage automatic documentation with slash star star
/**
    <p><b>Function prototype:</b></p>
  
    <p><b>Summary:</b></p>

    <p><b>Description:</b></p>

    <p><b>Precondition:</b></p>

    <p><b>Parameters:</b></p>

    <p><b>Returns:</b></p>

    <p><b>Example:</b></p>
    <code>
 
    </code>

    <p><b>Remarks:</b></p>
 */
// TODO Insert declarations or function prototypes (right here) to leverage 
// live documentation

#ifdef	__cplusplus
extern "C" {
#endif /* __cplusplus */

    // TODO If C++ is being used, regular C code needs function names to have C 
    // linkage so the functions can be used by the c code. 

#ifdef	__cplusplus
}
#endif /* __cplusplus */

#endif	/* XC_HEADER_TEMPLATE_H */


// [ PIC16F877A ] Configuration Bit Settings
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
 
// CONFIG
#pragma config FOSC = XT  // Oscillator Selection bits (XT oscillator)
#pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON // Power-up Timer Enable bit (PWRT enabled)
#pragma config BOREN = ON // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = OFF  // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit
                          // (RB3 is digital I/O, HV on MCLR must be used for programming)
#pragma config CPD = OFF  // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF  // Flash Program Memory Write Enable bits 
                          // (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF   // Flash Program Memory Code Protection bit (Code protection off)
 
#include <xc.h>

main.c

#include <xc.h>
#include "config.h"
#define _XTAL_FREQ 4000000

void main(void) {
    TRISC1 = 0;
    TRISC2 = 0;
    RC1 = 0;
    RC2 = 0;
    
    TRISB0 = 1;
    INTEDG = 1;
    
    INTE = 1;
    GIE = 1;
    
    
    while (1) {
        RC2 = 1;
        __delay_ms(1000);
        RC2 = 0;
        __delay_ms(1000);
    }
}

void __interrupt () isr(void) {
    if(INTF) {
        RC1 = ~RC1;
        INTF = 0;
    }
}