MSP430FR5949 PORT4 Interrupt Vector

Hi all

I am having trouble with servicing routines on VECTOR4 of the MSP430FR5949 ucontroller.

I am using the experimenter board MSP-EXP430FR5949 and I am trying to setup the switch on P4.5 to fire an interrupt and toggle the LED on P4.6

I use the following settings.

  P4OUT = BIT5;                             // Pull-up resistor on P4.5
  P4REN = BIT5;                             // Select pull-up mode for P4.5
  P4DIR = BIT6;                             // Set all but P4.6 to input direction
  P4IES = BIT5;                             // P4.5 Hi/Lo edge
  P4IFG = 0;                                // Clear all P4 interrupt flags
  P4IE = BIT5;                              // P4.5 interrupt enabled

I then have the following interrupt routing which never seems to be called when pressing the switch.

// Port 4 interrupt service routine
#pragma vector=PORT4_VECTOR
__interrupt void Port_4(void)
{
  P4IFG = 0;                            // Clear P4 IFG
 
  switch(P4IV)
    {
    case 0:
      break; // No Interrupt
   
    case 2:
      break; // P4.0
   
    case 4:  // P4.1
      break;
     
    case 6:  // P4.2
      break;
   
    case 8:  // P4.3
      break;
   
    case 10: // P4.4
      break;
   
    case 12: // P4.5
     
      if (ucCalON==0) 
      {
        ucCalON = 1;
        P4OUT = BIT6;
      }
      else
      {
        ucCalON = 0;
        P4OUT = 0;
      }
     
      break;
   
    case 14: // P4.6
      break;
   
    case 16: // P4.7
      break;
    }
}

Any ideas what's going on here people? The manual P4IV is serviced the same way as P1 and that works fine