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Trying to enable interrupt on PIN_B0

 
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seme1
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Trying to enable interrupt on PIN_B0
PostPosted: Mon Apr 13, 2009 6:21 pm     Reply with quote
Version : 4.013
Pic: PIC18F4550

I am trying to enable interrupts on RB0 with no luck so far. It's working fine for pins B4 ,B5,B6, and B7 but not B0. Any idea why ? or how to fix this ?
The code I'm using is the following:


Code:

#int_rb
void myfunc_isr() {
     int8 dd;
customflag=6;   
   dd = input_B();
}

void main()
{

  SET_TRIS_B(0xFF);
  ext_int_edge(L_TO_H);

  port_b_pullups(TRUE);
  clear_interrupt(INT_RB);
  ENABLE_INTERRUPTS(INT_RB);   
  ENABLE_INTERRUPTS(INT_RTCC);
  ENABLE_INTERRUPTS(INT_RDA); 
  ENABLE_INTERRUPTS(GLOBAL);
setup_adc(ADC_OFF);

while (customflag !=-1){
   lcdputc("interrupt_driven");
   customflag =-1;}

}

}
Guest
PostPosted: Mon Apr 13, 2009 6:56 pm     Reply with quote
Hi,

I don't know if this is your problem, but on most PICs, pin B0 is the external interrupt pin. The CCS interrupt handler for this pin is usually INT_EXT rather than INT_RB. In any event, it's an easy thing to test.....

Jeff
Guest
PostPosted: Mon Apr 13, 2009 8:48 pm     Reply with quote
Hi Again,

I checked the datasheet for the 18F4550 and it has three external interrupt pins INT0, INT1, and INT2, so the solution to your problem will be to use the EXT_INT0 interrupt handler.

Jeff
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