Pin Change Interrupt Setup Trouble

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

I'm trying to setup 2 Pin Change interrupts on the Duemilanove. I seem to have one setup on Pin 8 ok but the one for Pin 7 doesn't work. As a matter of fact when drive Pin 7 high it usually causes the controller to reset. Any help with setting up the control registers would be appreciated. Here's what I have. Thanks.

/* Use remaining pin change interrupts for lanes 3 and 4. These must be configured
       a different way.  */
    PCICR = mask_clear_all;  // Clear out the PC Int. Control Registerhhh
    PCICR |= mask_bit0;    // Enable PCIE0 for Lane 3 (pin 8)
    PCICR |= mask_bit2;    // Enable PCIE2 for Lane 4 (pin 7)
    PCMSK0 |= mask_bit0;   // Enable interrupt for Digital Pin #8 
    PCMSK2 |= mask_bit7;   // Enable interrupt for Digital Pin #7

/*
 * Here are my ISRs for the Pin change Interrupts
*/
/*
 * Interrupt Service Routine for lane 3
 */
ISR( PCINT0_vect )
{
  //if( HIGH == digitalRead(lane3Pin) )  
  ts_lanes[LANE3].timestamp = millis();
  if( ts_lanes[LANE3].timestamp > ts_lanes[LANE3].debouncets )
  {
    ts_lanes[LANE3].active = true;
    ts_lanes[LANE3].debouncets = ts_lanes[LANE3].timestamp + 500;  //500ms debounce
  }
}

/*
 * Interrupt Service Routine for lane 4
 */
ISR( PCINT23_vect )
{
  //if( HIGH == digitalRead(lane4Pin) )
  ts_lanes[LANE4].timestamp = millis();
  if( ts_lanes[LANE4].timestamp > ts_lanes[LANE4].debouncets )
  {
    ts_lanes[LANE4].active = true;
    ts_lanes[LANE4].debouncets = ts_lanes[LANE4].timestamp + 500;  //500ms debounce
  }
}
2

I think pin 8 and pin 7 use different vectors. See my code at:-
http://www.thebox.myzen.co.uk/Hardware/Crazy_People.html

3

Thanks for the assistance. Found that I hadn't setup my ISR routine correctly. Here's the bug:

Incorrect: 
ISR(PCINT23_vect)
{....}

Should be:
ISR(PCINT2_vect)
{....}

Found the correct interrupt vectors on page 55 of the AtMega168 reference material.