/*
 *  ======== Timer_isrStub ========
 */
Void Timer_isrStub(UArg arg)
{
    ti_catalog_arm_peripherals_timers_TimerRegsM4 *timer;
    Timer_Object *obj = (Timer_Object *)arg;

    timer = (ti_catalog_arm_peripherals_timers_TimerRegsM4 *)
        Timer_module->device[obj->id].baseAddr;

    /* clear all timer interrupt status bits */
    Timer_write(obj->altclk, &timer->GPTMICR, 0xFFFFFFFF);

    /* for DYNAMIC, mode latch prevThreshold and detect rollovers */
    if (obj->runMode == Timer_RunMode_DYNAMIC) {
        /* 
         * if the current threshold is greater than the prevThreshold
         * then a rollover has occurred.
         */
        if (obj->prevThreshold < timer->GPTMTAMATCHR) {
            obj->rollovers += 1;
        }
        obj->prevThreshold = timer->GPTMTAMATCHR;
    }

    obj->tickFxn(obj->arg);
}

/*
 *  ======== Timer_periodicStub ========
 */
Void Timer_periodicStub(UArg arg)
{
    Timer_Object *obj = (Timer_Object *)arg;
    volatile UInt32 dummy;

    dummy = Hwi_nvic.STCSR; /* read to ack the interrupt */
    Hwi_nvic.ICSR = 0x02000000; /* clear SysTick pending */

    obj->tickFxn(obj->arg);
}

/*
 *  ======== Timer_stub ========
 */
Void Timer_stub(UArg arg)
{
    Timer_Object *obj = (Timer_Object *)arg;
    TimerRegs *timer;

    timer = (TimerRegs *)Timer_module->device[obj->id].baseAddr;

    /* acknowledge the interrupt */
    timer->tisr = obj->tier;

    /* call the user's ISR */
    obj->tickFxn(obj->arg);
}

/*
 *  ======== Timer_dynStub ========
 */
Void Timer_dynStub(UArg arg)
{
    Timer_Object *obj = (Timer_Object *)arg;
    TimerRegs *timer;
    UInt irqStatus;

    timer = (TimerRegs *)Timer_module->device[obj->id].baseAddr;

    /* get interrupt status flags */
    irqStatus = timer->tisr;

    /* if this is a rollover (overflow) interrupt ... */
    if (irqStatus & TIMER_IRQSTATUS_OVF_IT_FLAG) {

        /* acknowledge the interrupt */
        timer->tisr |= TIMER_IRQSTATUS_OVF_IT_FLAG;

        obj->rollovers++;
    }

    /* if this is a threshold match interrupt ... */
    if (irqStatus & TIMER_IRQSTATUS_MAT_IT_FLAG) {

        /* acknowledge the interrupt */
        timer->tisr |= TIMER_IRQSTATUS_MAT_IT_FLAG;

        /* save previous threshold value */
        obj->prevThreshold = timer->tmar;

        /* set compare threshold for next periodic interrupt */
        timer->tmar += obj->period;

        /* call the user's ISR */
        obj->tickFxn(obj->arg);
    }
}