wdt_ex1_intervalMode.c

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/*******************************************************************************
 * MSP430i2xx Watchdog Timer - Interval Mode
 *
 * Description: In this example, the Watchdog Timer is setup in interval with
 * ACLK as a source. The WDT divides ACLK by 32768 so that it interrupts in
 * 1s intervals. The LED is toggled in the WDT ISR to show that the ISR
 * has been reached.
 *
 *
 *                MSP430i2041
 *             ------------------
 *         /|\|                  |
 *          | |                  |
 *          --|RST               |
 *            |              P1.4|-->LED
 *            |                  |
 *            |                  |
 *            |                  |
 *            |                  |
 *
 * Author: Zack Lalanne
 ******************************************************************************/
 
#include "driverlib.h"
 
int main(void) {
 
    // Stop the WDT
    WDT_hold(WDT_BASE);
 
    // Setup DCO to use internal resistor. DCO calibrated at 16.384 MHz
    CS_setupDCO(CS_INTERNAL_RESISTOR);
 
    // Configure interval to ACLK / 32768 = 1s
    WDT_initIntervalTimer(WDT_BASE,
                          WDT_CLOCKSOURCE_ACLK,
                          WDT_CLOCKDIVIDER_32K);
    WDT_resetTimer(WDT_BASE);
 
    // LED for monitoring interval
    GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN4);
 
    // Start the WDT and enter LPM0 with interrupts enabled
    SFR_clearInterrupt(SFR_WATCHDOG_INTERRUPT);
    SFR_enableInterrupt(SFR_WATCHDOG_INTERRUPT);
    WDT_start(WDT_BASE);
    __bis_SR_register(LPM0_bits | GIE);
}
 
 
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=WDT_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(WDT_VECTOR)))
#endif
void WDT_ISR(void) {
    // Toggle LED
    GPIO_toggleOutputOnPin(GPIO_PORT_P1, GPIO_PIN4);
}