/**************************************************************************************************
* @fn macMcuTimer2Isr
*
* @brief Interrupt service routine for timer2, the MAC timer.
*
* @param none
*
* @return none
**************************************************************************************************
*/
HAL_ISR_FUNCTION( macMcuTimer2Isr, T2_VECTOR )
{
uint8 t2irqm;
uint8 t2irqf;
HAL_ENTER_ISR();
t2irqm = T2IRQM;
t2irqf = T2IRQF;
/*------------------------------------------------------------------------------------------------
* Overflow compare interrupt - triggers when then overflow counter is
* equal to the overflow compare register.
*/
if ((t2irqf & TIMER2_OVF_COMPARE1F) & t2irqm)
{
/* call function for dealing with the timer compare interrupt */
macBackoffTimerCompareIsr();
/* clear overflow compare interrupt flag */
T2IRQF = ~TIMER2_OVF_COMPARE1F;
}
/*------------------------------------------------------------------------------------------------
* Overflow compare interrupt - triggers when then overflow counter is
* equal to the overflow compare register.
*/
if ((t2irqf & TIMER2_OVF_PERF) & t2irqm)
{
/* call function for dealing with the timer compare interrupt */
macBackoffTimerPeriodIsr();
/* clear overflow compare interrupt flag */
T2IRQF = ~TIMER2_OVF_PERF;
}
/*------------------------------------------------------------------------------------------------
* Overflow interrupt - triggers when the hardware timer rolls over.
*/
else if ((t2irqf & TIMER2_PERF) & t2irqm)
{
/* call energy detect interrupt function, this interrupt not used for any other functionality */
mcuRecordMaxRssiIsr();
/* clear the interrupt flag */
T2IRQF = ~TIMER2_PERF;
}
CLEAR_SLEEP_MODE();
HAL_EXIT_ISR();
}
/**************************************************************************************************
* @fn macMcuTimer2OverflowWorkaround
*
* @brief For CC2530, T2 interrupt won’t be generated when the current count is greater than
* the comparator. The interrupt is only generated when the current count is equal to
* the comparator. When the CC2530 is waking up from sleep, there is a small window
* that the count may be grater than the comparator, therefore, missing the interrupt.
* This workaround will call the T2 ISR when the current T2 count is greater than the
* comparator.
*
* @param none
*
* @return none
**************************************************************************************************
*/
void macMcuTimer2OverflowWorkaround(void)
{
if (T2IRQM & TIMER2_OVF_COMPARE1F)
{
/* T2 comapre 1 interrupt is enabled but T2 compare 1 intererrupt is not generated */
if (!(T2IRQF & TIMER2_OVF_COMPARE1F))
{
if (MAC_RADIO_BACKOFF_COUNT() > macMcuOverflowGetCompare())
{
/* Set the flag to trigger the timer compare interrupt */
macBackoffTimerCompareIsr();
T2IRQF = ~TIMER2_OVF_COMPARE1F;
}
}
}
}
