initial commit

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diff --git a/Drivers/STM32U0xx_HAL_Driver/Inc/stm32u0xx_hal_crc_ex.h b/Drivers/STM32U0xx_HAL_Driver/Inc/stm32u0xx_hal_crc_ex.h
new file mode 100644
index 0000000..d876b25
--- /dev/null
+++ b/Drivers/STM32U0xx_HAL_Driver/Inc/stm32u0xx_hal_crc_ex.h
@@ -0,0 +1,188 @@
+/**
+  ******************************************************************************
+  * @file    stm32u0xx_hal_crc_ex.h
+  * @author  MCD Application Team
+  * @brief   Header file of CRC HAL extended module.
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef STM32U0xx_HAL_CRC_EX_H
+#define STM32U0xx_HAL_CRC_EX_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32u0xx_hal_def.h"
+
+/** @addtogroup STM32U0xx_HAL_Driver
+  * @{
+  */
+
+/** @addtogroup CRCEx
+  * @{
+  */
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/** @defgroup CRCEx_Exported_Constants CRC Extended Exported Constants
+  * @{
+  */
+
+/** @defgroup CRCEx_Input_Data_Inversion Input Data Inversion Modes
+  * @{
+  */
+#define CRC_INPUTDATA_INVERSION_NONE               0x00000000U                         /*!< No input data inversion                    */
+#define CRC_INPUTDATA_INVERSION_HALFWORD_BYWORD    (CRC_CR_RTYPE_IN | CRC_CR_REV_IN_0) /*!< Input data half-word-reversal done by word */
+#define CRC_INPUTDATA_INVERSION_BYTE_BYWORD        (CRC_CR_RTYPE_IN | CRC_CR_REV_IN_1) /*!< Input data byte-reversal done by word      */
+#define CRC_INPUTDATA_INVERSION_BIT_BYBYTE         CRC_CR_REV_IN_0                     /*!< Input data bit-reversal done by byte       */
+#define CRC_INPUTDATA_INVERSION_BIT_BYHALFWORD     CRC_CR_REV_IN_1                     /*!< Input data bit-reversal done by half-word  */
+#define CRC_INPUTDATA_INVERSION_BIT_BYWORD         CRC_CR_REV_IN                       /*!< Input data bit-reversal done by word       */
+
+#define CRC_INPUTDATA_INVERSION_BYTE               CRC_INPUTDATA_INVERSION_BIT_BYBYTE     /*!< Definition for compatibility with legacy code */
+#define CRC_INPUTDATA_INVERSION_HALFWORD           CRC_INPUTDATA_INVERSION_BIT_BYHALFWORD /*!< Definition for compatibility with legacy code */
+#define CRC_INPUTDATA_INVERSION_WORD               CRC_INPUTDATA_INVERSION_BIT_BYWORD     /*!< Definition for compatibility with legacy code */
+/**
+  * @}
+  */
+
+/** @defgroup CRCEx_Output_Data_Inversion Output Data Inversion Modes
+  * @{
+  */
+#define CRC_OUTPUTDATA_INVERSION_DISABLE         0x00000000U                            /*!< No output data inversion                       */
+#define CRC_OUTPUTDATA_INVERSION_BIT             CRC_CR_REV_OUT_0                       /*!< Output data bit-reversal                       */
+#define CRC_OUTPUTDATA_INVERSION_HALFWORD        (CRC_CR_RTYPE_OUT | CRC_CR_REV_OUT_0)  /*!< Output data half-word-reversal done by word    */
+#define CRC_OUTPUTDATA_INVERSION_BYTE            (CRC_CR_RTYPE_OUT | CRC_CR_REV_OUT_1)  /*!< Output data byte-reversal done by word         */
+
+#define CRC_OUTPUTDATA_INVERSION_ENABLE          CRC_OUTPUTDATA_INVERSION_BIT           /*!<  Definition for compatibility with legacy code */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/* Exported macro ------------------------------------------------------------*/
+/** @defgroup CRCEx_Exported_Macros CRC Extended Exported Macros
+  * @{
+  */
+
+/**
+  * @brief  Set CRC output bit-reversal
+  * @param  __HANDLE__ CRC handle
+  * @retval None
+  */
+#define  __HAL_CRC_OUTPUTREVERSAL_BIT_ENABLE(__HANDLE__) MODIFY_REG(((__HANDLE__)->Instance->CR),\
+                                                                    (CRC_CR_RTYPE_OUT | CRC_CR_REV_OUT),\
+                                                                    CRC_CR_REV_OUT_0);
+
+/**
+  * @brief  Set CRC output halfword-reversal
+  * @param  __HANDLE__ CRC handle
+  * @retval None
+  */
+#define  __HAL_CRC_OUTPUTREVERSAL_HALFWORD_ENABLE(__HANDLE__) MODIFY_REG(((__HANDLE__)->Instance->CR),\
+                                                                         (CRC_CR_RTYPE_OUT | CRC_CR_REV_OUT),\
+                                                                         (CRC_CR_RTYPE_OUT | CRC_CR_REV_OUT_0));
+
+/**
+  * @brief  Set CRC output byte-reversal
+  * @param  __HANDLE__ CRC handle
+  * @retval None
+  */
+#define  __HAL_CRC_OUTPUTREVERSAL_BYTE_ENABLE(__HANDLE__) MODIFY_REG(((__HANDLE__)->Instance->CR), \
+                                                                     (CRC_CR_RTYPE_OUT | CRC_CR_REV_OUT), \
+                                                                     (CRC_CR_RTYPE_OUT | CRC_CR_REV_OUT_1));
+
+/* Definition for compatibility with legacy code */
+#define  __HAL_CRC_OUTPUTREVERSAL_ENABLE(__HANDLE__)    __HAL_CRC_OUTPUTREVERSAL_BIT_ENABLE(__HANDLE__)
+
+/**
+  * @brief  Unset CRC output reversal
+  * @param  __HANDLE__ CRC handle
+  * @retval None
+  */
+#define __HAL_CRC_OUTPUTREVERSAL_DISABLE(__HANDLE__) ((__HANDLE__)->Instance->CR &= ~(CRC_CR_RTYPE_OUT |\
+                                                      CRC_CR_REV_OUT))
+
+/**
+  * @brief  Set CRC non-default polynomial
+  * @param  __HANDLE__ CRC handle
+  * @param  __POLYNOMIAL__ 7, 8, 16 or 32-bit polynomial
+  * @retval None
+  */
+#define __HAL_CRC_POLYNOMIAL_CONFIG(__HANDLE__, __POLYNOMIAL__) ((__HANDLE__)->Instance->POL = (__POLYNOMIAL__))
+
+/**
+  * @}
+  */
+
+/* Private macros --------------------------------------------------------*/
+/** @defgroup CRCEx_Private_Macros CRC Extended Private Macros
+  * @{
+  */
+
+#define IS_CRC_INPUTDATA_INVERSION_MODE(MODE)     (((MODE) == CRC_INPUTDATA_INVERSION_NONE)            || \
+                                                   ((MODE) == CRC_INPUTDATA_INVERSION_HALFWORD_BYWORD) || \
+                                                   ((MODE) == CRC_INPUTDATA_INVERSION_BYTE_BYWORD)     || \
+                                                   ((MODE) == CRC_INPUTDATA_INVERSION_BIT_BYBYTE)      || \
+                                                   ((MODE) == CRC_INPUTDATA_INVERSION_BIT_BYHALFWORD)  || \
+                                                   ((MODE) == CRC_INPUTDATA_INVERSION_BIT_BYWORD))
+
+#define IS_CRC_OUTPUTDATA_INVERSION_MODE(MODE)    (((MODE) == CRC_OUTPUTDATA_INVERSION_DISABLE)  || \
+                                                   ((MODE) == CRC_OUTPUTDATA_INVERSION_BIT)      || \
+                                                   ((MODE) == CRC_OUTPUTDATA_INVERSION_HALFWORD) || \
+                                                   ((MODE) == CRC_OUTPUTDATA_INVERSION_BYTE))
+
+/**
+  * @}
+  */
+
+/* Exported functions --------------------------------------------------------*/
+
+/** @addtogroup CRCEx_Exported_Functions
+  * @{
+  */
+
+/** @addtogroup CRCEx_Exported_Functions_Group1
+  * @{
+  */
+/* Initialization and de-initialization functions  ****************************/
+HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength);
+HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode);
+HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode);
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* STM32U0xx_HAL_CRC_EX_H */