blink led program in c18 compiler

[hemnath]

Hi, I'm using c18 compiler, 18F8722 microcontroller, cystal 20Mhz.

#include<p18f8722.h>                                                    
#pragma config  OSC = HS, IESO = OFF, FCMEN = OFF, WDT = OFF
/*  ***************  TIMER *************** */
void delayzz(void)
{             
	int i, j;
	for(i=0;i<1000;i++)
	{
		for(j=0;j<2;j++)
		{         
			  /* Well its Just a Timer */            
		}    
	}   
}
                           

                /* ****************** MAIN ****************** */

void main(void)
{
	TRISD= 0x00;                  // PORT B Setting: Set all the pins in port B to Output.

	while(1)  
	{
		LATDbits.LATD0 = 1;   // RB-1 to High  

		Delay10KTCYx(250);
		
//		delayzz();
		
		LATDbits.LATD0 = 0;    // RB-0 to LOW

		Delay10KTCYx(250);
		
//		delayzz();
	}
}

Trying to blink the led which is conneced on pin D0. But it is not blinking. What could be the problem?
Please help.

 

[milan.rajik]

What is happening ? Does the LED turn ON but not OFF ? Maybe delays are not proper.

 

[hemnath]

It is not at all blinking. When I changed the configuration settings to IESO = ON. It is blinking.

I thought that crystal 20Mhz could be damaged. But already i have changed it to new crystal also.

 

[milan.rajik]

Zip and post the MPLAB project files.

 

[hemnath]

#include<p18f8722.h>                                                    
#pragma config  OSC = HS, IESO = OFF, FCMEN = OFF, WDT = OFF

void main(void)
{
	TRISD= 0x00;                  

	while(1)  
	{
		LATDbits.LATD0 = 1;   // RB-1 to High  
	}
}

Very simple code to glow the LED. It is not working with configuration settings IESO = OFF. LED glows once i changed to IESO = ON

- - - Updated - - -

But i want to use the external oscillator. Please find the zip file.

 

[FvM]

Very simple code to glow the LED. It is not working with configuration settings IESO = OFF. LED glows once i changed to IESO = ON

Proves that the external oscillator is not working. This is a hardware rather than a coding problem.

By the way, why are you always using HTML code tags for C code?

 

[milan.rajik]

Are you testing on breadboard ? If yes, try on a soldered board or atleast solder the oscillator circuit and try.

 

[hemnath]

I'm not testing on breadboard. I have a development board. Since there could be a chance of bad crystal. So i have replaced it with new 20Mhz crystal and 22pf capacitors. I have also double checked the connections from oscillator to micro-controller pins.

But still led doesn't turn ON.

 

[milan.rajik]

Use 27pf or 33pf Ceramic Capacitors for Oscillator circuit.

 

[hemnath]

Thank you. I'll change the capacitor value and post the results soon.