[HAL][UART] Add const qualifier for read only pointers

Inc/stm32l1xx_hal_uart.h

diff --git a/Inc/stm32l1xx_hal_uart.h b/Inc/stm32l1xx_hal_uart.h
index 6a510ae..84679d7 100644
--- a/Inc/stm32l1xx_hal_uart.h
+++ b/Inc/stm32l1xx_hal_uart.h
@@ -719,11 +719,11 @@
   */
 
 /* 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);

Src/stm32l1xx_hal_uart.c

diff --git a/Src/stm32l1xx_hal_uart.c b/Src/stm32l1xx_hal_uart.c
index 8f72496..b82efff 100644
--- a/Src/stm32l1xx_hal_uart.c
+++ b/Src/stm32l1xx_hal_uart.c
@@ -1127,10 +1127,10 @@
   * @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 = 0U;
 
   /* Check that a Tx process is not already ongoing */
@@ -1157,7 +1157,7 @@
     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
     {
@@ -1306,7 +1306,7 @@
   * @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)
@@ -1319,7 +1319,7 @@
     /* Process Locked */
     __HAL_LOCK(huart);
 
-    huart->pTxBuffPtr = pData;
+    huart->pTxBuffPtr = (uint8_t *) pData;
     huart->TxXferSize = Size;
     huart->TxXferCount = Size;
 
@@ -1386,7 +1386,7 @@
   * @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)
 {
   uint32_t *tmp;
 
@@ -1401,7 +1401,7 @@
     /* Process Locked */
     __HAL_LOCK(huart);
 
-    huart->pTxBuffPtr = pData;
+    huart->pTxBuffPtr = (uint8_t *) pData;
     huart->TxXferSize = Size;
     huart->TxXferCount = Size;