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[SOLVED] PIC16F877A basic LED-BLINKING circuit

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mansiz

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Hi all!!

I tried to blink a led and I can't as expected. I use CCS C. The hex file is working with ISIS properly. The code and the circuit are attached below. Can anybody tell me the mistakes??

Thanks in advance...

Code: 
#include <16F877A.H>
#use delay (clock = 20000000)
void main(void) {

while (1) {
output_high(PIN_A0);
delay_ms(1000); // Delay 1s
output_low(PIN_A0);
delay_ms(1000); // Delay 1s

}
  }

 

A0 is usually an analog input. You might have to change it to a digital one by setting tristates.
OR you can simply put the LED into any of the pins on port D(like pin D1) and change your code accordingly.
 

Hi,
Try this:
Code: 
#include <16F877A.H>
#use delay (clock = 20000000)
void main(void) {
TRISA = 0;
ADCON1 = 7;

while (1) {
output_high(PIN_A0);
delay_ms(1000); // Delay 1s
output_low(PIN_A0);
delay_ms(1000); // Delay 1s

}
  }

I don't really know CCS but try it and set the configuration bits accordingly. Turn Watchdog timer off, set appropriate oscillator setting, etc. I don't know how to do that in CCS, but configure these.

Hope this helps.
Tahmid.

Added after 35 seconds:

I see you have a 20MHz crystal, so set oscillator as "HS"
 

    M

    mansiz

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    V

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Changing the configuration bits with adding the code following line worked!!! The LED is blinking...

#fuses HS,NOWDT,NOLVP,NODEBUG,PUT,BROWNOUT

Thanks for your help!!!
 
hi,
Please what exactly are u referring to as configuration bits?
 

Configuration Register is a 16 bit register in the controller with each bit having different functions.Refer page no: 144 of the data sheet for PIC16F87XA.It is explained beautifully over there.
Regards,
Jerin.
 

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