休眠醒一次后电流变大

dozebug 提问时间：2018-3-20 10:05 /

用的是LL的库写的。定时唤醒工作。进入STOP模式后，电流1微安以内，但是醒过一次后电流就达到了10微安，并后面的进入STOP模式也是10。

经过测试，程序启动后先不进入STOP模式，等待一次RTC中断后再进入STOP模式，电流直接达到10。

void RTC_IRQHandler(void)
{
if(LL_RTC_IsActiveFlag_WUT(RTC) )
{
LL_RTC_ClearFlag_WUT(RTC);
}
LL_EXTI_ClearFlag_0_31(LL_EXTI_LINE_20);
}

/* USER CODE BEGIN 1 */
void Start_RTC(void)
{
/* Disable RTC registers write protection */
  LL_RTC_DisableWriteProtection(RTC);

   /* Disable wake up timer to modify it */
  LL_RTC_WAKEUP_Disable(RTC);
while (LL_RTC_IsActiveFlag_WUTW(RTC) != 1)
  {
}

/* Setting the Wakeup time to RTC_WUT_TIME s
   If LL_RTC_WAKEUPCLOCK_CKSPRE is selected, the frequency is 1Hz,
   this allows to get a wakeup time equal to RTC_WUT_TIME s
   if the counter is RTC_WUT_TIME */
  LL_RTC_WAKEUP_SetAutoReload(RTC, 30);
  LL_RTC_WAKEUP_SetClock(RTC, LL_RTC_WAKEUPCLOCK_CKSPRE);

  /* Enable wake up counter and wake up interrupt */
  /* Note: Periodic wakeup interrupt should be enabled to exit the device
   from low-power modes.*/
  LL_RTC_EnableIT_WUT(RTC);
  LL_RTC_WAKEUP_Enable(RTC);

  /* Enable RTC registers write protection */
  LL_RTC_EnableWriteProtection(RTC);

  /* ######## ENTER IN STANDBY MODE ######################################*/
  /** Request to enter STANDBY mode
* Following procedure describe in STM32L1xx Reference Manual
* See PWR part, section Low-power modes, Standby mode
*/
LL_EXTI_EnableIT_0_31(LL_EXTI_LINE_20);
LL_EXTI_EnableRisingTrig_0_31(LL_EXTI_LINE_20);
  /* Reset Internal Wake up flag */
  LL_RTC_ClearFlag_WUT(RTC);

}

有人碰到过这个问题么？？