/*
* ======== switchToWatchdogTimer ========
*
* Use 250ms watchdog timer interrupt to drive the Clock tick
* Stop the default Timer_A then start the watchdog timer.
*/
static void switchToWatchdogTimer()
{
Clock_TimerProxy_Handle clockTimer;
static Hwi_Handle wdtHwi = NULL;
/* Stop Timer_A currrently being used by Clock */
clockTimer = Clock_getTimerHandle();
Clock_TimerProxy_stop(clockTimer);
MAP_WDT_A_holdTimer();
if (wdtHwi == NULL) {
/* Create watchdog Timer Hwi */
wdtHwi = Hwi_create(19, clockTickFxn, NULL, NULL);
/* set WDT to use 32KHz input, 250ms period */
MAP_WDT_A_initIntervalTimer(WDT_A_CLOCKSOURCE_XCLK, WDT_A_CLOCKITERATIONS_8192);
}
/* don't allow deeper than DEEPSLEEP1 */
Power_setConstraint(PowerMSP432_DISALLOW_DEEPSLEEP_1);
/* Start watchdog Timer */
MAP_WDT_A_clearTimer();
MAP_WDT_A_startTimer();
/* hence, Clock_tick() will be called from 250ms watchdog timer interrupt */
}
/*
* ======== Clock_tickStop ========
*/
Void Clock_tickStop()
{
if (CLOCK_TICK_SOURCE == Clock_TickSource_TIMER) {
if (CLOCK_TICK_MODE != Clock_TickMode_DYNAMIC) {
Clock_TimerProxy_stop(Clock_module->timer);
}
}
}
