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16f886 INT_RB not working

 
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JK
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16f886 INT_RB not working
PostPosted: Fri Mar 05, 2010 8:23 pm     Reply with quote
I'm just trying to test PIN_B change interrupt writing program with CCS but it's not working at all.
The system of simple test is, to press button connected to RB7 port (pulled up) LED Light ON on port A1. That's it.

Test code is.....
Code:

#include "c: \ xxxxxxxxxxxxxx "

#int_RB
void  RB_isr(void)
{
  int temp;

  output_bit(pin_A1,1);

  delay_ms(120);
 
  temp = input_b();
}


void main()
{
   set_tris_b(1);
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_CLOCK_DIV_2);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   
   port_b_pullups(true);
 
 
   
   enable_interrupts(INT_RB);
   enable_interrupts(GLOBAL);
//Setup_Oscillator parameter not selected from Intr Oscillator Config tab

   // TODO: USER CODE!!.,8
   output_bit(pin_A1,1);
   delay_ms(500);
   output_bit(pin_A1,0);    //LED blink test is working fine.
   
   while(1)
   {
   }
}

It would be great if someone can help me out. Thank you.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Mar 05, 2010 11:38 pm     Reply with quote
I've modified your program so it should work. If press the button on
pin B7 down, the LED will go on. When you release the button, the LED
will go off.
Code:

#include <16F886.h>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)

#define SW_PIN   PIN_B7
#define LED_PIN  PIN_A1

#int_rb
void rb_isr(void)
{
int8 value;

output_toggle(LED_PIN);
delay_ms(10);

value = input(SW_PIN);
}

//============================
void main()
{
int8 temp;

output_low(LED_PIN);

temp = input(SW_PIN);
clear_interrupt(INT_RB);
enable_interrupts(INT_RB7);
enable_interrupts(GLOBAL);

while(1);
}
JK
Guest
Thank you
PostPosted: Sat Mar 06, 2010 1:10 am     Reply with quote
Thank you very much PCM programmer.
Now it is working perfectly.
I found myself that my understanding with 886 wasn't deep enough.

Thank you again.
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