Problems with simple flashing LED program

[saad]

I have written code in my PIC compiler "WIZ-C"

I am using simple program flashing LED on all ports but it did not work

although its simulation is 100% correct and show exactly output what i required

Programmer is also programming PIC16F877 correctly no error exist

watchdog timer=off, brown out rest=off

XT is the oscillator type i also tried RC circuit
in RC circuit i used RC is the oscillator type
Mclr pin is connected to 5V

Oscillator is working properly i checked it on OSCILLOSCOPE

I have different types of oscillator 4MHz , 10MHz and 12MHz are all in good conditions and working properly i also checked it in Oscilloscope

when i use red wire of function generator to CLKIN pin and floating ground pin it work properly but if i grounded the black wire led does'nt flash

I also tried RC circuit 11.36KΩ with 22pF capacitor but also failed what can i do

i tried different configuration of oscilator and burned the PIC but after insert in bradboard i failed to execute the circit

Plz provide me the solution
I shall be very thankful to you

 

[Peder]

Re: Please Help me

Did you set the port A pins to digital?

Make sure you have this in your code:

MOVLW 0x06 ; Configure all pins
MOVWF ADCON1 ; as digital inputs

 

[alexz]

Re: Please Help me

Did you set yor TRISx registers to output?
Are you using LATx registers to output values?

 

[comsians]

Re: Please Help me

I have done it but problem is same actually saad is my group member

 

[alexz]

Re: Please Help me

Can you post the code please?

 

[mzeitoun2002]

Re: Please Help me

Salam,

try making a flasher for one pin only (RB0) so as to know if the problem in harware or software.

i don't think that u can supply all this current

please submit the schematic & code

hope that helps

 

[comsians]

Re: Please Help me

#include <displays.h>
#include <delays.h>
#include<P16F877.h>

#__config _CP_OFF & _BODEN_ON & _WDT_OFF & _PWRTE_ON & _RC_OSC & _LVP_OFF

//////////////configuration register=0x3F73 PortB is disable to pull up

void main ()
{

#pragma asm
CLRWDT;
#pragma asmend



ADCON1=7;

TRISA=0x00;
PORTA = 0;

TRISB=0x00;
PORTB = 0;

TRISC=0x00;
PORTC = 0;

TRISD=0x00;
PORTD = 0;

TRISE=0x00;
PORTE = 0;


while(1)
{
Wait(100);
PORTA = 0;
PORTB = 0;
PORTC = 0;
PORTD = 0;
PORTE = 0;

Wait(100);
PORTA = 255;
PORTB = 255;
PORTC = 255;
PORTD = 255;
PORTE = 255;

} // end of while
}//end of main


Pin#1 (MCLR) is connected to +5V
Both vdd is connected to +5V
Both Vss is ground
For OSC1/CLKIN
+5V
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\
/
\ 3.3KΩ
/
OSC1/CLKIN_____\
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______
______ 100pF (1.5MHz)
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|
___
= Ground

 

[alexz]

Re: Please Help me

What compiler are you using?
Have you tried simply turn on 1 LED from a one pin without all the delays and other stuff?
Try to use XT osc option

 

[pasicr]

Re: Please Help me

I think you have problem with hardwere. I make code in basic for you for 877A and one led on portb.0 this led blink every one second. Pic is ruuning on 4 MHz. I send you hex file. Only put this file in pic with programmer,
if OK you's hardware is probably OK
Best regards