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Interrupts Help

 
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gekin
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Interrupts Help
PostPosted: Mon Jun 02, 2008 7:33 am     Reply with quote
Hi, I am currently trying to complete a project which would be best if interrupts were used. However, in trying to create a simple interrupts program in which an LED on pin C6 is blinking in a loop for the main code and whenever an interrupt occurs, an LED on pin C7 will blink once. However, the LED on pin C7 will blink constantly as if an interrupt is constantly being triggered. I contacted CCS and they told me to read port B, which is the port I am using to interrupt (int_RB). However, all that this seemed to do was make C7 blink a few times and then no light changes state for what seems like an arbitrary amount of time.

Code:


#include "C:\Documents and Settings\BrianTi\My Documents\My Projects\Distributorless Ignition Module\Interrupts\StepOne.h"\

int dummy;

#int_RB
void RB_isr(void)
{
 dummy = input_b(); // Read Port B
 output_high(PIN_C6);  // Blink light once
 delay_ms(200);
 output_low(PIN_C6);
 delay_ms(200);
}



void main()
{
   SET_TRIS_C( 0x00 );
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_spi(FALSE);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_comparator(FALSE);
   setup_vref(FALSE);
   enable_interrupts(INT_RB);
   enable_interrupts(GLOBAL);
   setup_oscillator(False);

  while(1)
  {
  output_toggle(PIN_C7);
  delay_ms(200);
  }
}



[header file]
#include <16F677.h>
#device adc=8

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES RC_IO                    //Resistor/Capacitor Osc
#FUSES PROTECT                  //Code protected from reads
#FUSES BROWNOUT                 //Reset when brownout detected
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOCPD                    //No EE protection
#FUSES NOPUT                    //No Power Up Timer
#FUSES IESO                     //Internal External Switch Over mode enabled
#FUSES FCMEN                    //Fail-safe clock monitor enabled

#use delay(clock=20000000)

[/header]
Douglas Kennedy



Joined: 07 Sep 2003
Posts: 755
Location: Florida

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PostPosted: Mon Jun 02, 2008 8:25 am     Reply with quote
A very good practice is to never never ever get in the habit of putting delays in interrupts.
Instead set a global flag in the interrupt and in main use the flag to control your LED.
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