diff --git a/Inc/stm32f3xx_hal_uart.h b/Inc/stm32f3xx_hal_uart.h
index 73b93fd..2cd30ca 100644
--- a/Inc/stm32f3xx_hal_uart.h
+++ b/Inc/stm32f3xx_hal_uart.h
@@ -1460,11 +1460,11 @@
   */
 
 /* IO operation functions *****************************************************/
-HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout);
+HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size, uint32_t Timeout);
 HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout);
-HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
+HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);
 HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
-HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
+HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size);
 HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size);
 HAL_StatusTypeDef HAL_UART_DMAPause(UART_HandleTypeDef *huart);
 HAL_StatusTypeDef HAL_UART_DMAResume(UART_HandleTypeDef *huart);
@@ -1518,8 +1518,8 @@
   */
 
 /* Peripheral State and Errors functions  **************************************************/
-HAL_UART_StateTypeDef HAL_UART_GetState(UART_HandleTypeDef *huart);
-uint32_t              HAL_UART_GetError(UART_HandleTypeDef *huart);
+HAL_UART_StateTypeDef HAL_UART_GetState(const UART_HandleTypeDef *huart);
+uint32_t              HAL_UART_GetError(const UART_HandleTypeDef *huart);
 
 /**
   * @}
diff --git a/Src/stm32f3xx_hal_uart.c b/Src/stm32f3xx_hal_uart.c
index 32c33bb..331a458 100644
--- a/Src/stm32f3xx_hal_uart.c
+++ b/Src/stm32f3xx_hal_uart.c
@@ -1076,10 +1076,10 @@
   * @param Timeout Timeout duration.
   * @retval HAL status
   */
-HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout)
+HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size, uint32_t Timeout)
 {
-  uint8_t  *pdata8bits;
-  uint16_t *pdata16bits;
+  const uint8_t  *pdata8bits;
+  const uint16_t *pdata16bits;
   uint32_t tickstart;
 
   /* Check that a Tx process is not already ongoing */
@@ -1105,7 +1105,7 @@
     if ((huart->Init.WordLength == UART_WORDLENGTH_9B) && (huart->Init.Parity == UART_PARITY_NONE))
     {
       pdata8bits  = NULL;
-      pdata16bits = (uint16_t *) pData;
+      pdata16bits = (const uint16_t *) pData;
     }
     else
     {
@@ -1247,7 +1247,7 @@
   * @param Size  Amount of data elements (u8 or u16) to be sent.
   * @retval HAL status
   */
-HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
+HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size)
 {
   /* Check that a Tx process is not already ongoing */
   if (huart->gState == HAL_UART_STATE_READY)
@@ -1259,7 +1259,7 @@
 
     __HAL_LOCK(huart);
 
-    huart->pTxBuffPtr  = pData;
+    huart->pTxBuffPtr  = (uint8_t *) pData;
     huart->TxXferSize  = Size;
     huart->TxXferCount = Size;
     huart->TxISR       = NULL;
@@ -1340,7 +1340,7 @@
   * @param Size  Amount of data elements (u8 or u16) to be sent.
   * @retval HAL status
   */
-HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
+HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size)
 {
   /* Check that a Tx process is not already ongoing */
   if (huart->gState == HAL_UART_STATE_READY)
@@ -1352,7 +1352,7 @@
 
     __HAL_LOCK(huart);
 
-    huart->pTxBuffPtr  = pData;
+    huart->pTxBuffPtr  = (uint8_t *) pData;
     huart->TxXferSize  = Size;
     huart->TxXferCount = Size;
 
@@ -2808,7 +2808,7 @@
   *               the configuration information for the specified UART.
   * @retval HAL state
   */
-HAL_UART_StateTypeDef HAL_UART_GetState(UART_HandleTypeDef *huart)
+HAL_UART_StateTypeDef HAL_UART_GetState(const UART_HandleTypeDef *huart)
 {
   uint32_t temp1;
   uint32_t temp2;
@@ -2824,7 +2824,7 @@
   *               the configuration information for the specified UART.
   * @retval UART Error Code
   */
-uint32_t HAL_UART_GetError(UART_HandleTypeDef *huart)
+uint32_t HAL_UART_GetError(const UART_HandleTypeDef *huart)
 {
   return huart->ErrorCode;
 }