[bsp][stm32] add usart3 driver init for stm32l4r5-nucleo

bsp/stm32/stm32l4r5-st-nucleo/board/CubeMX_Config/Src/stm32l4xx_hal_msp.c

@@ -111,6 +111,30 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
 
   /* USER CODE END LPUART1_MspInit 1 */
   }
+  else if(huart->Instance==USART3)
+  {
+  /* USER CODE BEGIN USART3_MspInit 0 */
+
+  /* USER CODE END USART3_MspInit 0 */
+    /* Peripheral clock enable */
+    __HAL_RCC_USART3_CLK_ENABLE();
+  
+    __HAL_RCC_GPIOD_CLK_ENABLE();
+    /**USART3 GPIO Configuration    
+    PD8     ------> USART3_TX
+    PD9     ------> USART3_RX 
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF7_USART3;
+    HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
+
+  /* USER CODE BEGIN USART3_MspInit 1 */
+
+  /* USER CODE END USART3_MspInit 1 */
+  }
 
 }
 
@@ -140,6 +164,24 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
 
   /* USER CODE END LPUART1_MspDeInit 1 */
   }
+  else if(huart->Instance==USART3)
+  {
+  /* USER CODE BEGIN USART3_MspDeInit 0 */
+
+  /* USER CODE END USART3_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_USART3_CLK_DISABLE();
+  
+    /**USART3 GPIO Configuration    
+    PD8     ------> USART3_TX
+    PD9     ------> USART3_RX 
+    */
+    HAL_GPIO_DeInit(GPIOD, GPIO_PIN_8|GPIO_PIN_9);
+
+  /* USER CODE BEGIN USART3_MspDeInit 1 */
+
+  /* USER CODE END USART3_MspDeInit 1 */
+  }
 
 }