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Problem with Interrupt

 
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Problem with Interrupt
PostPosted: Wed Feb 27, 2008 8:59 am     Reply with quote
Hi,
I have a little problem with interrupt.
I want to set PIN_A5 to low for 4 minutes. Then I want to set PIN_A5 to lhigh for 6 minutes. Unfortunately it doesn't work. I use a PIC 16F818. Below a part of my code:
Code:
#define INTS_PER_SECOND 61                   // (8000000/(4*128*256))
#int_rtcc                                    // This function is called every time
void clock_isr() {                           // the RTCC (timer0) overflows (255->0).
                                             // For this program this is apx 61 times
    if(--int_count==0) {                     // per second.
      ++seconds;
      int_count=INTS_PER_SECOND;
    }

}

void main() {

   int_count=INTS_PER_SECOND;
   set_timer0(0);
   setup_counters( RTCC_INTERNAL, RTCC_DIV_128 | RTCC_8_BIT);
   enable_interrupts(INT_RTCC);
   enable_interrupts(GLOBAL);

output_low(PIN_A5);

while(TRUE)
      {

        if(seconds == 240)
         {
          output_high(PIN_A5);               
         }

        if(seconds == 600)
         {
          output_low(PIN_A5);               
          seconds = 0;
         }

      }
}

Thanks!
tipoldo



Joined: 01 Feb 2006
Posts: 14
Location: Palma Mallorca

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PostPosted: Wed Feb 27, 2008 9:40 am     Reply with quote
Do you set the watchdog time dissable?
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Wed Feb 27, 2008 9:50 am     Reply with quote
Quote:

I want to set PIN_A5 to low for 4 minutes. Then I want to set PIN_A5 to lhigh for 6 minutes. Unfortunately it doesn't work. I use a PIC 16F818.


In this device PIN_A5 is an INPUT pin ONLY.
Use another pin with I/O capability.


Humberto
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