NRF51822 can not wakeup from sheep mode with RTC interrupt.

[lgj]

I did not use softdevice; //this my code

 void SysClk_LFInit(void)
 {

   NRF_CLOCK->LFCLKSRC    = (CLOCK_LFCLKSRC_SRC_RC <<      CLOCK_LFCLKSRC_SRC_Pos);
   NRF_CLOCK->EVENTS_LFCLKSTARTED  = 0;
   NRF_CLOCK->TASKS_LFCLKSTART     = 1;
   while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
   {
      //Do nothing.
   }
   NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;

   SysClk_Calibration();
}

void  RTC_Init(void)
{
                                     // ?? RTC??.
   NRF_RTC1->PRESCALER     = 32;//COUNTER_PRESCALER ;                  
   NRF_RTC1->CC[0]              = 33;
  // COMPARE_COUNTERTIME * RTC_FREQUENCY;  

// Enable TICK event and TICK interrupt:
//    NRF_RTC1->EVTENSET      = RTC_EVTENSET_TICK_Msk;
//    NRF_RTC1->INTENSET      = RTC_INTENSET_TICK_Msk;

   NRF_RTC1->EVTENSET      = RTC_EVTENCLR_COMPARE0_Msk;
   NRF_RTC1->INTENSET      = RTC_EVTENCLR_COMPARE0_Msk;

   NVIC_SetPriority(RTC1_IRQn,1);
   NVIC_EnableIRQ(RTC1_IRQn);
 }


    void RTC1_IRQHandler(void)
   {
         if(NRF_RTC1->EVENTS_COMPARE[0] != 0 )
        {
                NRF_RTC1->TASKS_CLEAR = 1;
                NRF_RTC1->EVENTS_COMPARE[0] = 0;
                rtc_time_flag = true;	
       }
   }

//this is my loop in main

    while(1)
    {
          if(rtc_time_flag == true)
          {
              rtc_time_flag = false;
          }
          __SEV();
          __WFI();
    }

After into sheep mode by _WFI(),It can not wakeup when the RTC1_IRQ coming. why?

[FormerMember]

In order for the COMPARE0 to trigger an interrupt, the interrupt needs to be enabled:

NRF_RTC1->INTENSET = RTC_INTENSET_COMPARE0_Msk;

In addition, in the the interrupt event should be cleared in the interrupt handler:

NRF_RTC0->EVENTS_COMPARE[0] = 0;

Please check if the above suggestions change anything.