watchdog interval

#include "msp430x14x.h"

volatile int counter = 0;
volatile int seconds = 0;

void setIntervalTime(int sec) {
    seconds = 31 * sec;
}

int main() {
    WDTCTL = WDTPW + WDTTMSEL; //select the timer mode
    BCSCTL1 |= XTS | DIVA1 | DIVA0;

    do {
        IFG1 &= ~OFIFG;
        for (int i = 0; i < 255; i++);
    }
    while ((IFG1 & OFIFG));

    WDTCTL = WDTPW | WDTTMSEL | WDTCNTCL | WDTSSEL;

    IE1 = WDTIFG; //enable the interrupt
    P2DIR = BIT1;
    _EINT();
    setIntervalTime(5);
    while (1);
}

#pragma vector = WDT_VECTOR
__interrupt void wdttimer(void) {
    counter++;
    if (counter == seconds) {
        P2OUT ^= BIT1;
        IFG1 &= ~WDTIFG;
        counter &= 0;
    }
}