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Detecting a change of state 16F877A

 
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eiby



Joined: 07 Oct 2008
Posts: 3

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Detecting a change of state 16F877A
PostPosted: Sun Nov 09, 2008 8:44 pm     Reply with quote
Hi. I have a problem with detection. I need to know how make the code for detecting that a bit is changing less than every 2 seconds, but without using interrupts, because this part of the code have to activate a while statement that is reading the same bits and incrementing a variable.
If the bits change state in more than 2 seconds the while statement have to be finished to go on with the rest of the code.
Do I make myself clear ?

Hope you can help. This is a part of the code:
Code:

#include <16F877A.h>

#define fila1 input_state(pin_a1)
#define fila2 input_state(pin_a2)
#define fila3 input_state(pin_a3)

cont_fast:

while(??????????){
  lcd_gotoxy(1,2);
  printf(lcd_putc,"%Lu",cuenta);

  if(fila1==1){
     ++cuenta;
     output_low(fila2);
     output_low(fila3);
     delay_ms(10); //tiempo de caida para filas 2 y 3
   }

  if(fila2==1){
     ++cuenta;
     output_low(fila3);
     delay_ms(5);
    }

  if(fila3==1){
    ++cuenta;
   }

_________________
Best regards,,

Abraham Guerrero
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