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PIC16f877a,,

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wAnted

New Member
my 16F877a can't provide output..


__________________________________________________ __
#include <pic.h>
#include "delay.c"
#include "adc.c"

//CONFIG bits
__CONFIG(XT & WDTDIS & PWRTDIS & UNPROTECT);


unsigned char display = 0;

void init_LEDS(void)
{

TRISB = 0x00;
PORTB = 0x00; //8 LEDS at PORTB

}


void main()
{
unsigned int adc_val; //hold adc value

init_LEDS();
init_ADC();


PORTB = 0X00;
start:
adc_val = read_ADC();
DelayMs(40);
if(adc_val < 573) // 0 - 1V
{
RB6 = 0;
RB5 = 1;
}

if(adc_val >=573 && adc_val <= 860) // 2.8-4.20V
{
RB6 = 1;
RB5 = 0;
}

if(adc_val >=880) //4.3V-above
{
RB6 = 1;
RB5 = 1;
}
DelayMs(20);


goto start;
}
__________________________________________________


when I tried to load this to my friends PIC it works properly but in my PIC, it wont provide an output? whats wrong?
 

Pommie

Well-Known Member
Most Helpful Member
It is probably because your pic isn't running.

Possible causes,
No/wrong crystal or no/wrong capacitors.
MCLR not tied high.
RB3 not tied high as LVP not turned off.
No power.
Pic not programmed.
Etc.

Mike.
 

rearthur2003

New Member
try erasing the pic, when done check the buffer of the pic if it is blank all 0xff then try to fill the buffer with some hex read it again if it is there as u put it, this will confirm if you are able to program the pic
 
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