Hi, at my this post i will introduce a port interrupt to you. It is so simple.

First of all you should your interrupt pin then enable it and define it’s interrupt edge (hi to low or low low high). You can define your ISR (interrupt service routine) as you wish. At my ISR it blink a LED. Also i defined a button to get out of ISR.

Best wishes.

 

//P2.1 is the interrupt exit button
//P2.4 Interrupt pin
//P2.5 Led Output

#include <msp430.h>
void main(void) {

WDTCTL = WDTPW + WDTHOLD;// Stop WDT
BCSCTL1 = CALBC1_1MHZ;
DCOCTL = CALDCO_1MHZ;

P2DIR |= BIT5; // Set P2.5 to output direction
P2IE |= 0x10; // P2.4 interrupt enabled 
P2IES |= 0x10; // P2.4 Hi/lo edge
P2OUT = 0x00;
}


// Port 2 interrupt service routine
#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
{
P2OUT = 0x00;
while((P2IN & ~BIT1) != BIT1){ // Button at P2.1 is high active
P2OUT ^= BIT5;
__delay_cycles(100000);
}
P2OUT = 0x00;
P2IFG &= ~0x10; // P1.4 IFG cleared
}