pic12f675 GPIO3 pin

The GPIO3 pin of the pic12f675 is not working as GPIO. The code is compiled with sdcc.

Code:


#include  <pic14/pic12f675.h>

typedef unsigned int word;
word __at 0x2007 __CONFIG = (
_BODEN_OFF &
_CPD_ON &
_CP_ON &
_MCLRE_OFF &
_PWRTE_ON &
_WDT_OFF);

void main(void){
   TRISIO = 0x08; //Poner todos los pines como salidas y activar entrada
   ANSEL=0x00;//desactivar convertidor A/D
   CMCON=0x07;//Desabilitar comparadores
   GPIO = 0x00; //Poner pines en bajo
   while (1)   {
    if(GP3){
      GPIO=0x02;
      delay(100);
    }
    else{
      GPIO=0x01;
      delay(150);
    }
   }
}
void delay(unsigned int tiempo){
unsigned int i,j;

 for(i=0;i<tiempo;i++)
  for(j=0;j<1275;j++);
}




Hi mvillaltaf.

pic12f675 is working ok for me.

Maybe there is some issue in your code.
Many years I don't play with SDCC, but this doesn't look quite good for me:

if(GP3){

Something like this makes more sense to me:
if( GPIO.GP3 ){
or:
if( GPIO.3 ){

I don't remember the correct sintax, but I hope you get the idea.

Hi again.

I'm implementing SDCC Compiler and Debugger for simulide, so I had to recall everything about SDCC.

I was wrong about GP3, I didn't remember it was so easy in SDCC.

And I didn't realize one thing:
The problem in your code is that void delay() is used before defined.
I compiled your code with void delay() defined before void main(void) and it works ok.


Just to show how SDCC compiler/debugger will be in next release: