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Help me with Capture Module in PIC16F887

 
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pk178



Joined: 10 Mar 2010
Posts: 10

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Help me with Capture Module in PIC16F887
PostPosted: Thu Apr 01, 2010 8:31 pm     Reply with quote
Hi everybody !

I want to use capture module in PIC16F887, this is my simple code :

Code:
#include <16f887.h>
#use delay(clock = 4000000)
#fuses LP,XT,EC_IO,INTRC,NOWDT,WDT,NOPUT,PUT
#use fast_io(d)
//******************************************************************************
int i = 0;
//******************************************************************************
#int_ccp1
void ccp1_isr(){
   for(i = 0; i < 10; i++){
      output_d(0xFF);
      delay_ms(200);
      output_d(0x00);
      delay_ms(200);
   }
}

void main(){
   setup_oscillator(OSC_4MHZ);
   output_d(0x00);
   set_tris_d(0x00);   
   SETUP_CCP1(CCP_CAPTURE_FE);
   SETUP_TIMER_1(T1_INTERNAL);
   enable_interrupts(int_ccp1);
   enable_interrupts(global);
   while(1);
}


I want PORTD will blinking if on CCP1 pin has falling edge pulse, but when I test, both falling pulse and rise pulse make PORTD blinking.

Please help me solve this prroblem. Thanks very much !
John P



Joined: 17 Sep 2003
Posts: 331

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PostPosted: Sat Apr 03, 2010 7:58 am     Reply with quote
How are you generating that rising/falling edge? If it's with a pushbutton, you may well be seeing the contacts bounce when it changes state. So whichever way the button is going, there is at least one lowgoing electrical edge.
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