STM32L0, standby 模式；RTC唤醒准

jasonyu · 发表于 2020-12-4 14:41:00

采用STM32L051C8T6进行低功耗设计。待机模式下采用RTC唤醒，RTC时钟为内部37K时钟，1Hz分频后，程序设置180s唤醒，结果140s就醒了，请教一下是否那里配置有问题下面是进入低功耗模式的配置：
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);  /* ½ûÖ1»½DÑê±Öó¼Æêy */
      HAL_PWR_EnableBkUpAccess(); // μí1|oÄÄ￡ê½ÏÂRTC ÔêDí·ÃÎê ￡¬RTC»½DÑDèòa
      HAL_PWR_DisablePVD();    // ½ûÖ1 PVD
HAL_PWREx_EnableUltraLowPower(); // 1Ø±ÕVREFINT éù3uA
HAL_PWREx_EnableFastWakeUp(); // oöÂÔVREFINT ¼ó¿ìÆô¶ˉËù¶è

HAL_DBGMCU_DisableDBGStopMode();    // // ÔêDí/½ûóÃ μ÷êÔ¶Ë¿ú éù800uA
GPIO_InitTypeDef GPIO_InitStruct={0};

__GPIOA_CLK_DISABLE();
__GPIOB_CLK_DISABLE();
__GPIOC_CLK_DISABLE();
__GPIOH_CLK_DISABLE();

HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);//??????????

WR_WAKEUP_PIN1 connected to PA.00
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc,180, RTC_WAKEUPCLOCK_CK_SPRE_16BITS); // rtc »½DÑ2éóÃLSIê±Öó￡¬μúò»2Îêy￡¬¼Æêyòç3ö»½DÑ￡»μú¶t2Îêy￡o½øDD16·ÖÅä￡¬
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);//?????PA.00?WakeUp Pin
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);//
HAL_PWR_EnterSTANDBYMode();//

下面是RTC配置：

void MX_RTC_Init(void)
{

RTC_TimeTypeDef sTime;
  RTC_DateTypeDef sDate;

/**Initialize RTC Only
*/
  hrtc.Instance = RTC;
  hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
  hrtc.Init.AsynchPrediv = 127;
  hrtc.Init.SynchPrediv = 255;
  hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
  hrtc.Init.OutPutRemap = RTC_OUTPUT_REMAP_NONE;
  hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  if (HAL_RTC_Init(&hrtc) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
  /* USER CODE BEGIN RTC_Init 2 */

  /* USER CODE END RTC_Init 2 */

/**Initialize RTC and set the Time and Date
*/
  sTime.Hours = 0x0;
  sTime.Minutes = 0x0;
  sTime.Seconds = 0x0;
  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sTime.StoreOperation = RTC_STOREOPERATION_RESET;
  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
  /* USER CODE BEGIN RTC_Init 3 */

  /* USER CODE END RTC_Init 3 */

  sDate.WeekDay = RTC_WEEKDAY_MONDAY;
  sDate.Month = RTC_MONTH_JANUARY;
  sDate.Date = 0x1;
  sDate.Year = 0x0;

  if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
  /* USER CODE BEGIN RTC_Init 4 */

  /* USER CODE END RTC_Init 4 */

/**Enable the WakeUp
*/
  if (HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0, RTC_WAKEUPCLOCK_CK_SPRE_16BITS) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
  /* USER CODE BEGIN RTC_Init 5 */
  HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR0,0x32F2);
  /* USER CODE END RTC_Init 5 */

}

其中    HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR0,0x32F2);是什么意思也不是很清楚