STM32f769 RTC亚秒寄存器平移失败

只看该作者 · 2018-7-14 16:46

我需要做一个在捕获GPS的pps信号时通过平移操作来同步RTC时钟和GPS PPS信号的上升沿，但是平移操作无法成功，通过函数发现在判断
RTC_CR寄存器REFCKON位时条件始终无法满足，初始化添加了清除此位的操作还是一样，查看代码没有发现将此位置位的操作，有没有遇到
同样问题的
平移函数HAL_StatusTypeDef HAL_RTCEx_SetSynchroShift(RTC_HandleTypeDef* hrtc, uint32_t ShiftAdd1S, uint32_t ShiftSubFS)
{
  uint32_t tickstart = 0;

  /* Check the parameters */
  assert_param(IS_RTC_SHIFT_ADD1S(ShiftAdd1S));
  assert_param(IS_RTC_SHIFT_SUBFS(ShiftSubFS));

  /* Process Locked */
  __HAL_LOCK(hrtc);

  hrtc->State = HAL_RTC_STATE_BUSY;

  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

  /* Get tick */
  tickstart = HAL_GetTick();

/* Wait until the shift is completed*/
while((hrtc->Instance->ISR & RTC_ISR_SHPF) != RESET)
{
   if((HAL_GetTick() - tickstart ) > RTC_TIMEOUT_VALUE)
   {
      /* Enable the write protection for RTC registers */
      __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

      hrtc->State = HAL_RTC_STATE_TIMEOUT;

      /* Process Unlocked */
      __HAL_UNLOCK(hrtc);
      return HAL_TIMEOUT;
   }
}

/* Check if the reference clock detection is disabled */
if((hrtc->Instance->CR & RTC_CR_REFCKON) == RESET)
{
   /* Configure the Shift settings */
   hrtc->Instance->SHIFTR = (uint32_t)(uint32_t)(ShiftSubFS) | (uint32_t)(ShiftAdd1S);

   /* If  RTC_CR_BYPSHAD bit = 0, wait for synchro else this check is not needed */
   if((hrtc->Instance->CR & RTC_CR_BYPSHAD) == RESET)
   {
      if(HAL_RTC_WaitForSynchro(hrtc) != HAL_OK)
      {
      /* Enable the write protection for RTC registers */
      __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

      hrtc->State = HAL_RTC_STATE_ERROR;

      /* Process Unlocked */
      __HAL_UNLOCK(hrtc);
      return HAL_ERROR;
      }
   }
}
else
{
   /* Enable the write protection for RTC registers */
   __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

   /* Change RTC state */
   hrtc->State = HAL_RTC_STATE_ERROR;

   /* Process Unlocked */
   __HAL_UNLOCK(hrtc);
   return HAL_ERROR;
}

  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

  /* Change RTC state */
  hrtc->State = HAL_RTC_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hrtc);

  return HAL_OK;
}

初始化清除RTC_CR寄存器REFCKON位
但是在平移操作判断if((hrtc->Instance->CR & RTC_CR_REFCKON) == RESET)始终RTC_CR 寄存器REFCKON位为1
导致平移失败

STM32f769 RTC亚秒寄存器平移失败

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