diff --git a/Inc/stm32f3xx_hal_cec.h b/Inc/stm32f3xx_hal_cec.h
index 2bd4e69..4aee685 100644
--- a/Inc/stm32f3xx_hal_cec.h
+++ b/Inc/stm32f3xx_hal_cec.h
@@ -163,7 +163,7 @@
 
   CEC_InitTypeDef         Init;           /*!< CEC communication parameters */
 
-  uint8_t                 *pTxBuffPtr;    /*!< Pointer to CEC Tx transfer Buffer */
+  const uint8_t           *pTxBuffPtr;    /*!< Pointer to CEC Tx transfer Buffer */
 
   uint16_t                TxXferCount;    /*!< CEC Tx Transfer Counter */
 
@@ -660,8 +660,8 @@
   */
 /* I/O operation functions  ***************************************************/
 HAL_StatusTypeDef HAL_CEC_Transmit_IT(CEC_HandleTypeDef *hcec, uint8_t InitiatorAddress, uint8_t DestinationAddress,
-                                      uint8_t *pData, uint32_t Size);
-uint32_t HAL_CEC_GetLastReceivedFrameSize(CEC_HandleTypeDef *hcec);
+                                      const uint8_t *pData, uint32_t Size);
+uint32_t HAL_CEC_GetLastReceivedFrameSize(const CEC_HandleTypeDef *hcec);
 void HAL_CEC_ChangeRxBuffer(CEC_HandleTypeDef *hcec, uint8_t *Rxbuffer);
 void HAL_CEC_IRQHandler(CEC_HandleTypeDef *hcec);
 void HAL_CEC_TxCpltCallback(CEC_HandleTypeDef *hcec);
@@ -675,8 +675,8 @@
   * @{
   */
 /* Peripheral State functions  ************************************************/
-HAL_CEC_StateTypeDef HAL_CEC_GetState(CEC_HandleTypeDef *hcec);
-uint32_t HAL_CEC_GetError(CEC_HandleTypeDef *hcec);
+HAL_CEC_StateTypeDef HAL_CEC_GetState(const CEC_HandleTypeDef *hcec);
+uint32_t HAL_CEC_GetError(const CEC_HandleTypeDef *hcec);
 /**
   * @}
   */
diff --git a/Src/stm32f3xx_hal_cec.c b/Src/stm32f3xx_hal_cec.c
index beae1ae..65d48fb 100644
--- a/Src/stm32f3xx_hal_cec.c
+++ b/Src/stm32f3xx_hal_cec.c
@@ -694,7 +694,7 @@
   * @retval HAL status
   */
 HAL_StatusTypeDef HAL_CEC_Transmit_IT(CEC_HandleTypeDef *hcec, uint8_t InitiatorAddress, uint8_t DestinationAddress,
-                                      uint8_t *pData, uint32_t Size)
+                                      const uint8_t *pData, uint32_t Size)
 {
   /* if the peripheral isn't already busy and if there is no previous transmission
      already pending due to arbitration lost */
@@ -749,7 +749,7 @@
   * @param hcec CEC handle
   * @retval Frame size
   */
-uint32_t HAL_CEC_GetLastReceivedFrameSize(CEC_HandleTypeDef *hcec)
+uint32_t HAL_CEC_GetLastReceivedFrameSize(const CEC_HandleTypeDef *hcec)
 {
   return hcec->RxXferSize;
 }
@@ -829,7 +829,7 @@
       __HAL_CEC_LAST_BYTE_TX_SET(hcec);
     }
     /* In all cases transmit the byte */
-    hcec->Instance->TXDR = *hcec->pTxBuffPtr;
+    hcec->Instance->TXDR = (uint8_t)*hcec->pTxBuffPtr;
     hcec->pTxBuffPtr++;
     /* clear Tx-Byte request flag */
     __HAL_CEC_CLEAR_FLAG(hcec, CEC_FLAG_TXBR);
@@ -957,7 +957,7 @@
   *              the configuration information for the specified CEC module.
   * @retval HAL state
   */
-HAL_CEC_StateTypeDef HAL_CEC_GetState(CEC_HandleTypeDef *hcec)
+HAL_CEC_StateTypeDef HAL_CEC_GetState(const CEC_HandleTypeDef *hcec)
 {
   uint32_t temp1, temp2;
   temp1 = hcec->gState;
@@ -972,7 +972,7 @@
   *              the configuration information for the specified CEC.
   * @retval CEC Error Code
   */
-uint32_t HAL_CEC_GetError(CEC_HandleTypeDef *hcec)
+uint32_t HAL_CEC_GetError(const CEC_HandleTypeDef *hcec)
 {
   return hcec->ErrorCode;
 }