1 files changed, 62 insertions, 0 deletions
diff --git a/stmhal/stm32f4xx_hal_msp.c b/stmhal/stm32f4xx_hal_msp.c
index 6ab992a63c..f5611e1082 100644
--- a/stmhal/stm32f4xx_hal_msp.c
+++ b/stmhal/stm32f4xx_hal_msp.c
@@ -94,6 +94,68 @@ void HAL_MspDeInit(void) {
 }
 
 /**
+  * @brief RTC MSP Initialization 
+  *        This function configures the hardware resources used in this example
+  * @param hrtc: RTC handle pointer
+  * 
+  * @note  Care must be taken when HAL_RCCEx_PeriphCLKConfig() is used to select 
+  *        the RTC clock source; in this case the Backup domain will be reset in  
+  *        order to modify the RTC Clock source, as consequence RTC registers (including 
+  *        the backup registers) and RCC_BDCR register are set to their reset values.
+  *             
+  * @retval None
+  */
+void HAL_RTC_MspInit(RTC_HandleTypeDef *hrtc)
+{
+  RCC_OscInitTypeDef        RCC_OscInitStruct;
+  RCC_PeriphCLKInitTypeDef  PeriphClkInitStruct;
+  
+  /* To change the source clock of the RTC feature (LSE, LSI), You have to:
+     - Enable the power clock using __PWR_CLK_ENABLE()
+     - Enable write access using HAL_PWR_EnableBkUpAccess() function before to 
+       configure the RTC clock source (to be done once after reset).
+     - Reset the Back up Domain using __HAL_RCC_BACKUPRESET_FORCE() and 
+       __HAL_RCC_BACKUPRESET_RELEASE().
+     - Configure the needed RTc clock source */
+  
+  /*##-1- Configue LSE as RTC clock soucre ###################################*/ 
+  RCC_OscInitStruct.OscillatorType =  RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
+  RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
+  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+  { 
+    //Error_Handler();
+    return;
+  }
+  
+  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
+  PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
+  if(HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
+  { 
+    //Error_Handler();
+    return;
+  }
+  
+  /*##-2- Enable RTC peripheral Clocks #######################################*/ 
+  /* Enable RTC Clock */ 
+  __HAL_RCC_RTC_ENABLE(); 
+}
+
+/**
+  * @brief RTC MSP De-Initialization 
+  *        This function frees the hardware resources used in this example:
+  *          - Disable the Peripheral's clock
+  * @param hrtc: RTC handle pointer
+  * @retval None
+  */
+void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc)
+{
+  /*##-1- Reset peripherals ##################################################*/
+   __HAL_RCC_RTC_DISABLE();
+}
+
+/**
   * @}
   */