MSP430 LaunchPad Timer_0 Interrupt

Using Timer_0 Interrupt to Toggle LED on MSP430 LaunchPad


#include <msp430.h>

#define OUTPUT_PIN  BIT0
/*
 * main.c
 *
 *  Testing timer_0 interrupt to toggle LED (P1.0)
 */

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;   // Stop watchdog timer

    P1DIR |= OUTPUT_PIN; // Set P1.0 and P1.6 to output direction
    P1OUT |= OUTPUT_PIN;
    P1OUT ^= (OUTPUT_PIN);


    BCSCTL1 = CALBC1_8MHZ;
    DCOCTL = CALDCO_8MHZ;

    CCTL0 = CCIE;
    TACTL = TASSEL_2 + ID_3 + MC_1;     // Set the timer A to SMCLCK, UP to TACCR0, Input Divider: /8
    TACCR0 = 50000-1;       // 50ms @(8MHz/8)

    __enable_interrupt();

    __bis_SR_register(LPM0 + GIE); // LPM0 with interrupts enabled
    while(1);
}

// Timer A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
{
    static unsigned char ucCount = 0;
    if(ucCount++ >= 20){
        P1OUT ^= OUTPUT_PIN;
        ucCount = 0;
    }

}