C++ script for Pic18f24k20 microcontroller that illuminates an LED on pin RA1 for approximately 30 seconds

Pic18f24k20 30 second LED script

//******************************************************************************
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// *******************************************************************
// PIC18F45K20 PICkit 3 Debug Express Demo Board Lesson 7 - ADC
//
// This lesson uses the Analog-to-Digital-Converter on the PIC18F45K20
// to convert the potentiometer voltage on pin RA0 to a value used
// to set the speed of the LED rotation.
//
// *******************************************************************
// *    See included documentation for Lesson instructions           *
// *******************************************************************

/** C O N F I G U R A T I O N   B I T S ******************************/

#pragma config FOSC = INTIO67 //, FCMEN = OFF, IESO = OFF                     	// CONFIG1H
#pragma config BOREN = OFF //PWRT = OFF, , BORV = 30                        	// CONFIG2L
#pragma config WDTEN = OFF     
#pragma config MCLRE = OFF, LVP = OFF//, LPT1OSC = OFF, PBADEN = ON, CCP2MX = PORTBE     // CONFIG3H


/** I N C L U D E S **************************************************/
#include "p18f24k20.h"
#include "delays.h"


/** V A R I A B L E S *************************************************/



/** D E C L A R A T I O N S *******************************************/
void high_isr( void );
void low_isr( void );


/** Declare Interrupt Vector Sections ****************************/
#pragma code high_vector=0x08
void interrupt_at_high_vector(void)
{
   _asm goto high_isr _endasm
}

#pragma code low_vector=0x18
void interrupt_at_low_vector (void)
{
    _asm goto low_isr _endasm
}

#pragma code    // declare executable instructions
/*
Purpose: 
 * Turn on 3 LEDs for approximately 30 seconds, then turn them off

                
Flow:
 * initialize chip's pins and allow interrupts.  Next, turn LED output pin 
 *  (pin RA1) on for 30 seconds, then turn it off


 Versions:
 * 0.1 - initial release
    
    
*/


void main (void)
{
   
    char i; //counter

    // Set unused pins as output
    TRISA = 0b10000000; 				// CLKI is input (RA7)

    OSCCONbits.IRCF = 0b111;			// sets oscillator to 16MHz 111
    RCONbits.IPEN = 1;                  // Allow interrupts
    INTCONbits.GIEL = 1;                // Allow low priority interrupts



    // set RA1 as output and turn it on 
    TRISAbits.RA1 = 0;
    PORTAbits.RA1 = 1;
       

    while (1)
    {
        // for LED to light up 30 seconds: 10000*4*109*109/16000000 
        for (i = 0; i <= 109; i++)
        {
            Delay10KTCYx(109);
        }
        // turn RA1 off
        PORTAbits.RA1 = 0;
       
    }
}



/*****************************************************************
* Function  : void high_isr(void)
* Input     : None (triggers from PIR1bits.RCIF 
* Output    : None (but puts values in global variable 'buf'
* Notes     : Triggers during USART reception.  Puts values from USART communication
                into global variable 'buf'.  Once reception is complete (receives ASCII 47 ('/')),
                sets flag = 1 and ParkerCommTransmit function begins.
******************************************************************/
#pragma interrupt high_isr			// declare function as high priority isr
void high_isr(void)
{
	
}

/*****************************************************************
* Function:        void low_isr(void)
* Input:
* Output:
* Overview:
******************************************************************/
#pragma interruptlow low_isr			// declare function as low priority isr
void low_isr(void)
{

}