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Interrupt Not Working - 16F690 - CCP1 [solved]

 
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buler



Joined: 27 Apr 2011
Posts: 10

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Interrupt Not Working - 16F690 - CCP1 [solved]
PostPosted: Wed Apr 27, 2011 12:47 pm     Reply with quote
I have a pic eval board that has a couple leds on it and a pic 16F690. I have one led that is set to turn on and off in a continuous loop. I also have a wire going from that led to the capture pin on the 16f690 and am trying to catch the rising edges of the signal. To indicate it has found a rising edge I have it set to turn another LED on (until I get it to work I have it set to remain "ON").

However I am unable to get the LED to turn on (get pin C1 to output high).

Here is my code:
Code:
#include <16F690.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)

#INT_CCP1
void isr()
{
   output_high(pin_C1);
}


void main()
{
   setup_ccp1(CCP_CAPTURE_RE);
   enable_interrupts(INT_CCP1);
   
   while(TRUE){
   
   output_high(pin_C0);
   delay_ms(1000);
   output_low(pin_C0);
   delay_ms(1000);
   }
}


Last edited by buler on Wed Apr 27, 2011 2:05 pm; edited 1 time in total
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Apr 27, 2011 1:20 pm     Reply with quote
You don't have Global interrupts enabled. You need to add that line.
buler



Joined: 27 Apr 2011
Posts: 10

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PostPosted: Wed Apr 27, 2011 1:45 pm     Reply with quote
PCM programmer wrote:
You don't have Global interrupts enabled. You need to add that line.


Thank you, I had that line in earlier but for some reason I had deleted it. It looks like my main reason (when that line of code was present) for this not working was because I was only supplying the board with 3.3V and by the time the signal was reaching the capture port it must have been too low to trigger anything.

I have supplied the board 5V and added in that line of code and it is working perfectly.
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