text: /**
    ******************************************************************************
    * @file    stm32f1xx_hal_flash_ex.c
    * @author  MCD Application Team
    * @version V1.1.1
    * @date    12-May-2017
    * @brief   Extended FLASH HAL module driver.
    *    
    *          This file provides firmware functions to manage the following 
    *          functionalities of the FLASH peripheral:
    *           + Extended Initialization/de-initialization functions
    *           + Extended I/O operation functions
    *           + Extended Peripheral Control functions 
    *         
    @verbatim
    ==============================================================================
                 ##### Flash peripheral extended features  #####
    ==============================================================================
             
                        ##### How to use this driver #####
    ==============================================================================
    [..] This driver provides functions to configure and program the FLASH memory 
         of all STM32F1xxx devices. It includes
         
          (++) Set/Reset the write protection
          (++) Program the user Option Bytes
          (++) Get the Read protection Level
    
    @endverbatim
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *   1. Redistributions of source code must retain the above copyright notice,
    *      this list of conditions and the following disclaimer.
    *   2. Redistributions in binary form must reproduce the above copyright notice,
    *      this list of conditions and the following disclaimer in the documentation
    *      and/or other materials provided with the distribution.
    *   3. Neither the name of STMicroelectronics nor the names of its contributors
    *      may be used to endorse or promote products derived from this software
    *      without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************  
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f1xx_hal.h"
  
  /** @addtogroup STM32F1xx_HAL_Driver
    * @{
    */
  #ifdef HAL_FLASH_MODULE_ENABLED
  
  /** @addtogroup FLASH
    * @{
    */
  /** @addtogroup FLASH_Private_Variables
   * @{
   */
  /* Variables used for Erase pages under interruption*/
  extern FLASH_ProcessTypeDef pFlash;
  /**
    * @}
    */
  
  /**
    * @}
    */
    
  /** @defgroup FLASHEx FLASHEx
    * @brief FLASH HAL Extension module driver
    * @{
    */
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /** @defgroup FLASHEx_Private_Constants FLASHEx Private Constants
   * @{
   */
  #define FLASH_POSITION_IWDGSW_BIT        FLASH_OBR_IWDG_SW_Pos
  #define FLASH_POSITION_OB_USERDATA0_BIT  FLASH_OBR_DATA0_Pos
  #define FLASH_POSITION_OB_USERDATA1_BIT  FLASH_OBR_DATA1_Pos
  /**
    * @}
    */
  
  /* Private macro -------------------------------------------------------------*/
  /** @defgroup FLASHEx_Private_Macros FLASHEx Private Macros
    * @{
    */
  /**
    * @}
    */ 
  
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /** @defgroup FLASHEx_Private_Functions FLASHEx Private Functions
   * @{
   */
  /* Erase operations */
  static void              FLASH_MassErase(uint32_t Banks);
  void    FLASH_PageErase(uint32_t PageAddress);
  
  /* Option bytes control */
  static HAL_StatusTypeDef FLASH_OB_EnableWRP(uint32_t WriteProtectPage);
  static HAL_StatusTypeDef FLASH_OB_DisableWRP(uint32_t WriteProtectPage);
  static HAL_StatusTypeDef FLASH_OB_RDP_LevelConfig(uint8_t ReadProtectLevel);
  static HAL_StatusTypeDef FLASH_OB_UserConfig(uint8_t UserConfig);
  static HAL_StatusTypeDef FLASH_OB_ProgramData(uint32_t Address, uint8_t Data);
  static uint32_t          FLASH_OB_GetWRP(void);
  static uint32_t          FLASH_OB_GetRDP(void);
  static uint8_t           FLASH_OB_GetUser(void);
  
  /**
    * @}
    */
  
  /* Exported functions ---------------------------------------------------------*/
  /** @defgroup FLASHEx_Exported_Functions FLASHEx Exported Functions
    * @{
    */
    
  /** @defgroup FLASHEx_Exported_Functions_Group1 FLASHEx Memory Erasing functions
   *  @brief   FLASH Memory Erasing functions
    *
  @verbatim   
    ==============================================================================
                  ##### FLASH Erasing Programming functions ##### 
    ==============================================================================
  
      [..] The FLASH Memory Erasing functions, includes the following functions:
      (+) @ref HAL_FLASHEx_Erase: return only when erase has been done
      (+) @ref HAL_FLASHEx_Erase_IT: end of erase is done when @ref HAL_FLASH_EndOfOperationCallback 
          is called with parameter 0xFFFFFFFF
  
      [..] Any operation of erase should follow these steps:
      (#) Call the @ref HAL_FLASH_Unlock() function to enable the flash control register and 
          program memory access.
      (#) Call the desired function to erase page.
      (#) Call the @ref HAL_FLASH_Lock() to disable the flash program memory access 
         (recommended to protect the FLASH memory against possible unwanted operation).
  
  @endverbatim
    * @{
    */
    
  
  /**
    * @brief  Perform a mass erase or erase the specified FLASH memory pages
    * @note   To correctly run this function, the @ref HAL_FLASH_Unlock() function
    *         must be called before.
    *         Call the @ref HAL_FLASH_Lock() to disable the flash memory access 
    *         (recommended to protect the FLASH memory against possible unwanted operation)
    * @param[in]  pEraseInit pointer to an FLASH_EraseInitTypeDef structure that
    *         contains the configuration information for the erasing.
    *
    * @param[out]  PageError pointer to variable  that
    *         contains the configuration information on faulty page in case of error
    *         (0xFFFFFFFF means that all the pages have been correctly erased)
    *
    * @retval HAL_StatusTypeDef HAL Status
    */
  HAL_StatusTypeDef HAL_FLASHEx_Erase(FLASH_EraseInitTypeDef *pEraseInit, uint32_t *PageError)
  {
    HAL_StatusTypeDef status = HAL_ERROR;
    uint32_t address = 0U;
  
    /* Process Locked */
    __HAL_LOCK(&pFlash);
  
    /* Check the parameters */
    assert_param(IS_FLASH_TYPEERASE(pEraseInit->TypeErase));
  
    if (pEraseInit->TypeErase == FLASH_TYPEERASE_MASSERASE)
    {
  #if defined(FLASH_BANK2_END)
      if (pEraseInit->Banks == FLASH_BANK_BOTH)
      {
        /* Mass Erase requested for Bank1 and Bank2 */
        /* Wait for last operation to be completed */
        if ((FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK) && \
            (FLASH_WaitForLastOperationBank2((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK))
        {
          /*Mass erase to be done*/
          FLASH_MassErase(FLASH_BANK_BOTH);
          
          /* Wait for last operation to be completed */
          if ((FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK) && \
              (FLASH_WaitForLastOperationBank2((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK))
          {
            status = HAL_OK;
          }
          
          /* If the erase operation is completed, disable the MER Bit */
          CLEAR_BIT(FLASH->CR, FLASH_CR_MER);
          CLEAR_BIT(FLASH->CR2, FLASH_CR2_MER);
        }
      }
      else if (pEraseInit->Banks == FLASH_BANK_2)
      {
        /* Mass Erase requested for Bank2 */
        /* Wait for last operation to be completed */
        if (FLASH_WaitForLastOperationBank2((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK)
        {
          /*Mass erase to be done*/
          FLASH_MassErase(FLASH_BANK_2);
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperationBank2((uint32_t)FLASH_TIMEOUT_VALUE);
          
          /* If the erase operation is completed, disable the MER Bit */
          CLEAR_BIT(FLASH->CR2, FLASH_CR2_MER);
        }
      }
      else 
  #endif /* FLASH_BANK2_END */
      {
        /* Mass Erase requested for Bank1 */
        /* Wait for last operation to be completed */
        if (FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK)
        {
          /*Mass erase to be done*/
          FLASH_MassErase(FLASH_BANK_1);
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
          
          /* If the erase operation is completed, disable the MER Bit */
          CLEAR_BIT(FLASH->CR, FLASH_CR_MER);
        }
      }
    }
    else
    {
      /* Page Erase is requested */
      /* Check the parameters */
      assert_param(IS_FLASH_PROGRAM_ADDRESS(pEraseInit->PageAddress));
      assert_param(IS_FLASH_NB_PAGES(pEraseInit->PageAddress, pEraseInit->NbPages));
      
  #if defined(FLASH_BANK2_END)
      /* Page Erase requested on address located on bank2 */
      if(pEraseInit->PageAddress > FLASH_BANK1_END)
      {   
        /* Wait for last operation to be completed */
        if (FLASH_WaitForLastOperationBank2((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK)
        {
          /*Initialization of PageError variable*/
          *PageError = 0xFFFFFFFFU;
          
          /* Erase by page by page to be done*/
          for(address = pEraseInit->PageAddress;
              address < (pEraseInit->PageAddress + (pEraseInit->NbPages)*FLASH_PAGE_SIZE);
              address += FLASH_PAGE_SIZE)
          {
            FLASH_PageErase(address);
            
            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperationBank2((uint32_t)FLASH_TIMEOUT_VALUE);
            
            /* If the erase operation is completed, disable the PER Bit */
            CLEAR_BIT(FLASH->CR2, FLASH_CR2_PER);
            
            if (status != HAL_OK)
            {
              /* In case of error, stop erase procedure and return the faulty address */
              *PageError = address;
              break;
            }
          }
        }
      }
      else
  #endif /* FLASH_BANK2_END */
     {
        /* Page Erase requested on address located on bank1 */
        /* Wait for last operation to be completed */
        if (FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE) == HAL_OK)
        {
          /*Initialization of PageError variable*/
          *PageError = 0xFFFFFFFFU;
          
          /* Erase page by page to be done*/
          for(address = pEraseInit->PageAddress;
              address < ((pEraseInit->NbPages * FLASH_PAGE_SIZE) + pEraseInit->PageAddress);
              address += FLASH_PAGE_SIZE)
          {
            FLASH_PageErase(address);
            
            /* Wait for last operation to be completed */
            status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
            
            /* If the erase operation is completed, disable the PER Bit */
            CLEAR_BIT(FLASH->CR, FLASH_CR_PER);
            
            if (status != HAL_OK)
            {
              /* In case of error, stop erase procedure and return the faulty address */
              *PageError = address;
              break;
            }
          }
        }
      }
    }
  
    /* Process Unlocked */
    __HAL_UNLOCK(&pFlash);
  
    return status;
  }
  
  /**
    * @brief  Perform a mass erase or erase the specified FLASH memory pages with interrupt enabled
    * @note   To correctly run this function, the @ref HAL_FLASH_Unlock() function
    *         must be called before.
    *         Call the @ref HAL_FLASH_Lock() to disable the flash memory access 
    *         (recommended to protect the FLASH memory against possible unwanted operation)
    * @param  pEraseInit pointer to an FLASH_EraseInitTypeDef structure that
    *         contains the configuration information for the erasing.
    *
    * @retval HAL_StatusTypeDef HAL Status
    */
  HAL_StatusTypeDef HAL_FLASHEx_Erase_IT(FLASH_EraseInitTypeDef *pEraseInit)
  {
    HAL_StatusTypeDef status = HAL_OK;
  
    /* Process Locked */
    __HAL_LOCK(&pFlash);
  
    /* If procedure already ongoing, reject the next one */
    if (pFlash.ProcedureOnGoing != FLASH_PROC_NONE)
    {
      return HAL_ERROR;
    }
    
    /* Check the parameters */
    assert_param(IS_FLASH_TYPEERASE(pEraseInit->TypeErase));
  
    /* Enable End of FLASH Operation and Error source interrupts */
    __HAL_FLASH_ENABLE_IT(FLASH_IT_EOP | FLASH_IT_ERR);
  
  #if defined(FLASH_BANK2_END)
    /* Enable End of FLASH Operation and Error source interrupts */
    __HAL_FLASH_ENABLE_IT(FLASH_IT_EOP_BANK2 | FLASH_IT_ERR_BANK2);
    
  #endif
    if (pEraseInit->TypeErase == FLASH_TYPEERASE_MASSERASE)
    {
      /*Mass erase to be done*/
      pFlash.ProcedureOnGoing = FLASH_PROC_MASSERASE;
          FLASH_MassErase(pEraseInit->Banks);
    }
    else
    {
      /* Erase by page to be done*/
  
      /* Check the parameters */
      assert_param(IS_FLASH_PROGRAM_ADDRESS(pEraseInit->PageAddress));
      assert_param(IS_FLASH_NB_PAGES(pEraseInit->PageAddress, pEraseInit->NbPages));
  
      pFlash.ProcedureOnGoing = FLASH_PROC_PAGEERASE;
      pFlash.DataRemaining = pEraseInit->NbPages;
      pFlash.Address = pEraseInit->PageAddress;
  
      /*Erase 1st page and wait for IT*/
      FLASH_PageErase(pEraseInit->PageAddress);
    }
  
    return status;
  }
  
  /**
    * @}
    */
  
  /** @defgroup FLASHEx_Exported_Functions_Group2 Option Bytes Programming functions
   *  @brief   Option Bytes Programming functions
    *
  @verbatim   
    ==============================================================================
                  ##### Option Bytes Programming functions ##### 
    ==============================================================================  
      [..]
      This subsection provides a set of functions allowing to control the FLASH 
      option bytes operations.
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Erases the FLASH option bytes.
    * @note   This functions erases all option bytes except the Read protection (RDP).
    *         The function @ref HAL_FLASH_Unlock() should be called before to unlock the FLASH interface
    *         The function @ref HAL_FLASH_OB_Unlock() should be called before to unlock the options bytes
    *         The function @ref HAL_FLASH_OB_Launch() should be called after to force the reload of the options bytes
    *         (system reset will occur)
    * @retval HAL status
    */
  
  HAL_StatusTypeDef HAL_FLASHEx_OBErase(void)
  {
    uint8_t rdptmp = OB_RDP_LEVEL_0;
    HAL_StatusTypeDef status = HAL_ERROR;
  
    /* Get the actual read protection Option Byte value */
    rdptmp = FLASH_OB_GetRDP();
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
  
    if(status == HAL_OK)
    {
      /* Clean the error context */
      pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
      /* If the previous operation is completed, proceed to erase the option bytes */
      SET_BIT(FLASH->CR, FLASH_CR_OPTER);
      SET_BIT(FLASH->CR, FLASH_CR_STRT);
  
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
  
      /* If the erase operation is completed, disable the OPTER Bit */
      CLEAR_BIT(FLASH->CR, FLASH_CR_OPTER);
  
      if(status == HAL_OK)
      {
        /* Restore the last read protection Option Byte value */
        status = FLASH_OB_RDP_LevelConfig(rdptmp);
      }
    }
  
    /* Return the erase status */
    return status;
  }
  
  /**
    * @brief  Program option bytes
    * @note   The function @ref HAL_FLASH_Unlock() should be called before to unlock the FLASH interface
    *         The function @ref HAL_FLASH_OB_Unlock() should be called before to unlock the options bytes
    *         The function @ref HAL_FLASH_OB_Launch() should be called after to force the reload of the options bytes
    *         (system reset will occur)
    *
    * @param  pOBInit pointer to an FLASH_OBInitStruct structure that
    *         contains the configuration information for the programming.
    *
    * @retval HAL_StatusTypeDef HAL Status
    */
  HAL_StatusTypeDef HAL_FLASHEx_OBProgram(FLASH_OBProgramInitTypeDef *pOBInit)
  {
    HAL_StatusTypeDef status = HAL_ERROR;
  
    /* Process Locked */
    __HAL_LOCK(&pFlash);
  
    /* Check the parameters */
    assert_param(IS_OPTIONBYTE(pOBInit->OptionType));
  
    /* Write protection configuration */
    if((pOBInit->OptionType & OPTIONBYTE_WRP) == OPTIONBYTE_WRP)
    {
      assert_param(IS_WRPSTATE(pOBInit->WRPState));
      if (pOBInit->WRPState == OB_WRPSTATE_ENABLE)
      {
        /* Enable of Write protection on the selected page */
        status = FLASH_OB_EnableWRP(pOBInit->WRPPage);
      }
      else
      {
        /* Disable of Write protection on the selected page */
        status = FLASH_OB_DisableWRP(pOBInit->WRPPage);
      }
      if (status != HAL_OK)
      {
        /* Process Unlocked */
        __HAL_UNLOCK(&pFlash);
        return status;
      }
    }
  
    /* Read protection configuration */
    if((pOBInit->OptionType & OPTIONBYTE_RDP) == OPTIONBYTE_RDP)
    {
      status = FLASH_OB_RDP_LevelConfig(pOBInit->RDPLevel);
      if (status != HAL_OK)
      {
        /* Process Unlocked */
        __HAL_UNLOCK(&pFlash);
        return status;
      }
    }
  
    /* USER configuration */
    if((pOBInit->OptionType & OPTIONBYTE_USER) == OPTIONBYTE_USER)
    {
      status = FLASH_OB_UserConfig(pOBInit->USERConfig);
      if (status != HAL_OK)
      {
        /* Process Unlocked */
        __HAL_UNLOCK(&pFlash);
        return status;
      }
    }
  
    /* DATA configuration*/
    if((pOBInit->OptionType & OPTIONBYTE_DATA) == OPTIONBYTE_DATA)
    {
      status = FLASH_OB_ProgramData(pOBInit->DATAAddress, pOBInit->DATAData);
      if (status != HAL_OK)
      {
        /* Process Unlocked */
        __HAL_UNLOCK(&pFlash);
        return status;
      }
    }
  
    /* Process Unlocked */
    __HAL_UNLOCK(&pFlash);
  
    return status;
  }
  
  /**
    * @brief  Get the Option byte configuration
    * @param  pOBInit pointer to an FLASH_OBInitStruct structure that
    *         contains the configuration information for the programming.
    *
    * @retval None
    */
  void HAL_FLASHEx_OBGetConfig(FLASH_OBProgramInitTypeDef *pOBInit)
  {
    pOBInit->OptionType = OPTIONBYTE_WRP | OPTIONBYTE_RDP | OPTIONBYTE_USER;
  
    /*Get WRP*/
    pOBInit->WRPPage = FLASH_OB_GetWRP();
  
    /*Get RDP Level*/
    pOBInit->RDPLevel = FLASH_OB_GetRDP();
  
    /*Get USER*/
    pOBInit->USERConfig = FLASH_OB_GetUser();
  }
  
  /**
    * @brief  Get the Option byte user data
    * @param  DATAAdress Address of the option byte DATA
    *          This parameter can be one of the following values:
    *            @arg @ref OB_DATA_ADDRESS_DATA0
    *            @arg @ref OB_DATA_ADDRESS_DATA1
    * @retval Value programmed in USER data
    */
  uint32_t HAL_FLASHEx_OBGetUserData(uint32_t DATAAdress)
  {
    uint32_t value = 0;
    
    if (DATAAdress == OB_DATA_ADDRESS_DATA0)
    {
      /* Get value programmed in OB USER Data0 */
      value = READ_BIT(FLASH->OBR, FLASH_OBR_DATA0) >> FLASH_POSITION_OB_USERDATA0_BIT;
    }
    else
    {
      /* Get value programmed in OB USER Data1 */
      value = READ_BIT(FLASH->OBR, FLASH_OBR_DATA1) >> FLASH_POSITION_OB_USERDATA1_BIT;
    }
    
    return value;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /** @addtogroup FLASHEx_Private_Functions
   * @{
   */
  
  /**
    * @brief  Full erase of FLASH memory Bank 
    * @param  Banks Banks to be erased
    *          This parameter can be one of the following values:
    *            @arg @ref FLASH_BANK_1 Bank1 to be erased
    @if STM32F101xG
    *            @arg @ref FLASH_BANK_2 Bank2 to be erased
    *            @arg @ref FLASH_BANK_BOTH Bank1 and Bank2 to be erased
    @endif
    @if STM32F103xG
    *            @arg @ref FLASH_BANK_2 Bank2 to be erased
    *            @arg @ref FLASH_BANK_BOTH Bank1 and Bank2 to be erased
    @endif
    *
    * @retval None
    */
  static void FLASH_MassErase(uint32_t Banks)
  {
    /* Check the parameters */
    assert_param(IS_FLASH_BANK(Banks));
  
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
  #if defined(FLASH_BANK2_END)
    if(Banks == FLASH_BANK_BOTH)
    {
      /* bank1 & bank2 will be erased*/
      SET_BIT(FLASH->CR, FLASH_CR_MER);
      SET_BIT(FLASH->CR2, FLASH_CR2_MER);
      SET_BIT(FLASH->CR, FLASH_CR_STRT);
      SET_BIT(FLASH->CR2, FLASH_CR2_STRT);
    }
    else if(Banks == FLASH_BANK_2)
    {
      /*Only bank2 will be erased*/
      SET_BIT(FLASH->CR2, FLASH_CR2_MER);
      SET_BIT(FLASH->CR2, FLASH_CR2_STRT);
    }
    else
    {
  #endif /* FLASH_BANK2_END */
  #if !defined(FLASH_BANK2_END)
    /* Prevent unused argument(s) compilation warning */
    UNUSED(Banks);
  #endif /* FLASH_BANK2_END */  
      /* Only bank1 will be erased*/
      SET_BIT(FLASH->CR, FLASH_CR_MER);
      SET_BIT(FLASH->CR, FLASH_CR_STRT);
  #if defined(FLASH_BANK2_END)
    }
  #endif /* FLASH_BANK2_END */
  }
  
  /**
    * @brief  Enable the write protection of the desired pages
    * @note   An option byte erase is done automatically in this function. 
    * @note   When the memory read protection level is selected (RDP level = 1), 
    *         it is not possible to program or erase the flash page i if
    *         debug features are connected or boot code is executed in RAM, even if nWRPi = 1 
    * 
    * @param  WriteProtectPage specifies the page(s) to be write protected.
    *         The value of this parameter depend on device used within the same series 
    * @retval HAL status 
    */
  static HAL_StatusTypeDef FLASH_OB_EnableWRP(uint32_t WriteProtectPage)
  {
    HAL_StatusTypeDef status = HAL_OK;
    uint16_t WRP0_Data = 0xFFFF;
  #if defined(FLASH_WRP1_WRP1)
    uint16_t WRP1_Data = 0xFFFF;
  #endif /* FLASH_WRP1_WRP1 */
  #if defined(FLASH_WRP2_WRP2)
    uint16_t WRP2_Data = 0xFFFF;
  #endif /* FLASH_WRP2_WRP2 */
  #if defined(FLASH_WRP3_WRP3)
    uint16_t WRP3_Data = 0xFFFF;
  #endif /* FLASH_WRP3_WRP3 */
    
    /* Check the parameters */
    assert_param(IS_OB_WRP(WriteProtectPage));
      
    /* Get current write protected pages and the new pages to be protected ******/
    WriteProtectPage = (uint32_t)(~((~FLASH_OB_GetWRP()) | WriteProtectPage));
    
  #if defined(OB_WRP_PAGES0TO15MASK)
    WRP0_Data = (uint16_t)(WriteProtectPage & OB_WRP_PAGES0TO15MASK);
  #elif defined(OB_WRP_PAGES0TO31MASK)
    WRP0_Data = (uint16_t)(WriteProtectPage & OB_WRP_PAGES0TO31MASK);
  #endif /* OB_WRP_PAGES0TO31MASK */
    
  #if defined(OB_WRP_PAGES16TO31MASK)
    WRP1_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES16TO31MASK) >> 8U);
  #elif defined(OB_WRP_PAGES32TO63MASK)
    WRP1_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES32TO63MASK) >> 8U);
  #endif /* OB_WRP_PAGES32TO63MASK */
   
  #if defined(OB_WRP_PAGES64TO95MASK)
    WRP2_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES64TO95MASK) >> 16U);
  #endif /* OB_WRP_PAGES64TO95MASK */
  #if defined(OB_WRP_PAGES32TO47MASK)
    WRP2_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES32TO47MASK) >> 16U);
  #endif /* OB_WRP_PAGES32TO47MASK */
  
  #if defined(OB_WRP_PAGES96TO127MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES96TO127MASK) >> 24U); 
  #elif defined(OB_WRP_PAGES48TO255MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES48TO255MASK) >> 24U); 
  #elif defined(OB_WRP_PAGES48TO511MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES48TO511MASK) >> 24U); 
  #elif defined(OB_WRP_PAGES48TO127MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES48TO127MASK) >> 24U); 
  #endif /* OB_WRP_PAGES96TO127MASK */
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
  
    if(status == HAL_OK)
    { 
      /* Clean the error context */
      pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
      /* To be able to write again option byte, need to perform a option byte erase */
      status = HAL_FLASHEx_OBErase();
      if (status == HAL_OK)  
      {
        /* Enable write protection */
        SET_BIT(FLASH->CR, FLASH_CR_OPTPG);
  
  #if defined(FLASH_WRP0_WRP0)
        if(WRP0_Data != 0xFFU)
        {
          OB->WRP0 &= WRP0_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP0_WRP0 */
  
  #if defined(FLASH_WRP1_WRP1)
        if((status == HAL_OK) && (WRP1_Data != 0xFFU))
        {
          OB->WRP1 &= WRP1_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP1_WRP1 */
  
  #if defined(FLASH_WRP2_WRP2)
        if((status == HAL_OK) && (WRP2_Data != 0xFFU))
        {
          OB->WRP2 &= WRP2_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP2_WRP2 */
  
  #if defined(FLASH_WRP3_WRP3)
        if((status == HAL_OK) && (WRP3_Data != 0xFFU))
        {
          OB->WRP3 &= WRP3_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP3_WRP3 */
  
        /* if the program operation is completed, disable the OPTPG Bit */
        CLEAR_BIT(FLASH->CR, FLASH_CR_OPTPG);
      }
    }
    
    return status;
  }
  
  /**
    * @brief  Disable the write protection of the desired pages
    * @note   An option byte erase is done automatically in this function. 
    * @note   When the memory read protection level is selected (RDP level = 1), 
    *         it is not possible to program or erase the flash page i if   
    *         debug features are connected or boot code is executed in RAM, even if nWRPi = 1 
    * 
    * @param  WriteProtectPage specifies the page(s) to be write unprotected.
    *         The value of this parameter depend on device used within the same series 
    * @retval HAL status 
    */
  static HAL_StatusTypeDef FLASH_OB_DisableWRP(uint32_t WriteProtectPage)
  {
    HAL_StatusTypeDef status = HAL_OK;
    uint16_t WRP0_Data = 0xFFFF;
  #if defined(FLASH_WRP1_WRP1)
    uint16_t WRP1_Data = 0xFFFF;
  #endif /* FLASH_WRP1_WRP1 */
  #if defined(FLASH_WRP2_WRP2)
    uint16_t WRP2_Data = 0xFFFF;
  #endif /* FLASH_WRP2_WRP2 */
  #if defined(FLASH_WRP3_WRP3)
    uint16_t WRP3_Data = 0xFFFF;
  #endif /* FLASH_WRP3_WRP3 */
    
    /* Check the parameters */
    assert_param(IS_OB_WRP(WriteProtectPage));
  
    /* Get current write protected pages and the new pages to be unprotected ******/
    WriteProtectPage = (FLASH_OB_GetWRP() | WriteProtectPage);
  
  #if defined(OB_WRP_PAGES0TO15MASK)
    WRP0_Data = (uint16_t)(WriteProtectPage & OB_WRP_PAGES0TO15MASK);
  #elif defined(OB_WRP_PAGES0TO31MASK)
    WRP0_Data = (uint16_t)(WriteProtectPage & OB_WRP_PAGES0TO31MASK);
  #endif /* OB_WRP_PAGES0TO31MASK */
    
  #if defined(OB_WRP_PAGES16TO31MASK)
    WRP1_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES16TO31MASK) >> 8U);
  #elif defined(OB_WRP_PAGES32TO63MASK)
    WRP1_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES32TO63MASK) >> 8U);
  #endif /* OB_WRP_PAGES32TO63MASK */
   
  #if defined(OB_WRP_PAGES64TO95MASK)
    WRP2_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES64TO95MASK) >> 16U);
  #endif /* OB_WRP_PAGES64TO95MASK */
  #if defined(OB_WRP_PAGES32TO47MASK)
    WRP2_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES32TO47MASK) >> 16U);
  #endif /* OB_WRP_PAGES32TO47MASK */
  
  #if defined(OB_WRP_PAGES96TO127MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES96TO127MASK) >> 24U); 
  #elif defined(OB_WRP_PAGES48TO255MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES48TO255MASK) >> 24U); 
  #elif defined(OB_WRP_PAGES48TO511MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES48TO511MASK) >> 24U); 
  #elif defined(OB_WRP_PAGES48TO127MASK)
    WRP3_Data = (uint16_t)((WriteProtectPage & OB_WRP_PAGES48TO127MASK) >> 24U); 
  #endif /* OB_WRP_PAGES96TO127MASK */
  
      
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
  
    if(status == HAL_OK)
    { 
      /* Clean the error context */
      pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
      /* To be able to write again option byte, need to perform a option byte erase */
      status = HAL_FLASHEx_OBErase();
      if (status == HAL_OK)  
      {
        SET_BIT(FLASH->CR, FLASH_CR_OPTPG);
  
  #if defined(FLASH_WRP0_WRP0)
        if(WRP0_Data != 0xFFU)
        {
          OB->WRP0 |= WRP0_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP0_WRP0 */
  
  #if defined(FLASH_WRP1_WRP1)
        if((status == HAL_OK) && (WRP1_Data != 0xFFU))
        {
          OB->WRP1 |= WRP1_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP1_WRP1 */
  
  #if defined(FLASH_WRP2_WRP2)
        if((status == HAL_OK) && (WRP2_Data != 0xFFU))
        {
          OB->WRP2 |= WRP2_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP2_WRP2 */
  
  #if defined(FLASH_WRP3_WRP3)
        if((status == HAL_OK) && (WRP3_Data != 0xFFU))
        {
          OB->WRP3 |= WRP3_Data;
          
          /* Wait for last operation to be completed */
          status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
        }
  #endif /* FLASH_WRP3_WRP3 */
  
        /* if the program operation is completed, disable the OPTPG Bit */
        CLEAR_BIT(FLASH->CR, FLASH_CR_OPTPG);
      }
    }
    return status;
  }
  
  /**
    * @brief  Set the read protection level.
    * @param  ReadProtectLevel specifies the read protection level.
    *         This parameter can be one of the following values:
    *            @arg @ref OB_RDP_LEVEL_0 No protection
    *            @arg @ref OB_RDP_LEVEL_1 Read protection of the memory
    * @retval HAL status
    */
  static HAL_StatusTypeDef FLASH_OB_RDP_LevelConfig(uint8_t ReadProtectLevel)
  {
    HAL_StatusTypeDef status = HAL_OK;
    
    /* Check the parameters */
    assert_param(IS_OB_RDP_LEVEL(ReadProtectLevel));
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
    
    if(status == HAL_OK)
    { 
      /* Clean the error context */
      pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
      
      /* If the previous operation is completed, proceed to erase the option bytes */
      SET_BIT(FLASH->CR, FLASH_CR_OPTER);
      SET_BIT(FLASH->CR, FLASH_CR_STRT);
  
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
  
      /* If the erase operation is completed, disable the OPTER Bit */
      CLEAR_BIT(FLASH->CR, FLASH_CR_OPTER);
  
      if(status == HAL_OK)
      {
        /* Enable the Option Bytes Programming operation */
        SET_BIT(FLASH->CR, FLASH_CR_OPTPG);
        
        WRITE_REG(OB->RDP, ReadProtectLevel);
        
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE); 
        
        /* if the program operation is completed, disable the OPTPG Bit */
        CLEAR_BIT(FLASH->CR, FLASH_CR_OPTPG);
      }
    }
    
    return status;
  }
  
  /**
    * @brief  Program the FLASH User Option Byte.    
    * @note   Programming of the OB should be performed only after an erase (otherwise PGERR occurs)
    * @param  UserConfig The FLASH User Option Bytes values FLASH_OBR_IWDG_SW(Bit2), 
    *         FLASH_OBR_nRST_STOP(Bit3),FLASH_OBR_nRST_STDBY(Bit4).
    *         And BFBF2(Bit5) for STM32F101xG and STM32F103xG . 
    * @retval HAL status
    */
  static HAL_StatusTypeDef FLASH_OB_UserConfig(uint8_t UserConfig)
  {
    HAL_StatusTypeDef status = HAL_OK;
  
    /* Check the parameters */
    assert_param(IS_OB_IWDG_SOURCE((UserConfig&OB_IWDG_SW)));
    assert_param(IS_OB_STOP_SOURCE((UserConfig&OB_STOP_NO_RST)));
    assert_param(IS_OB_STDBY_SOURCE((UserConfig&OB_STDBY_NO_RST)));
  #if defined(FLASH_BANK2_END)
    assert_param(IS_OB_BOOT1((UserConfig&OB_BOOT1_SET)));
  #endif /* FLASH_BANK2_END */
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
    
    if(status == HAL_OK)
    {     
      /* Clean the error context */
      pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
      /* Enable the Option Bytes Programming operation */
      SET_BIT(FLASH->CR, FLASH_CR_OPTPG); 
   
  #if defined(FLASH_BANK2_END)
      OB->USER = (UserConfig | 0xF0U);
  #else
      OB->USER = (UserConfig | 0x88U);
  #endif /* FLASH_BANK2_END */
  
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
  
      /* if the program operation is completed, disable the OPTPG Bit */
      CLEAR_BIT(FLASH->CR, FLASH_CR_OPTPG);
    }
    
    return status; 
  }
  
  /**
    * @brief  Programs a half word at a specified Option Byte Data address.
    * @note   The function @ref HAL_FLASH_Unlock() should be called before to unlock the FLASH interface
    *         The function @ref HAL_FLASH_OB_Unlock() should be called before to unlock the options bytes
    *         The function @ref HAL_FLASH_OB_Launch() should be called after to force the reload of the options bytes 
    *         (system reset will occur)
    *         Programming of the OB should be performed only after an erase (otherwise PGERR occurs)
    * @param  Address specifies the address to be programmed.
    *         This parameter can be 0x1FFFF804 or 0x1FFFF806. 
    * @param  Data specifies the data to be programmed.
    * @retval HAL status
    */
  static HAL_StatusTypeDef FLASH_OB_ProgramData(uint32_t Address, uint8_t Data)
  {
    HAL_StatusTypeDef status = HAL_ERROR;
    
    /* Check the parameters */
    assert_param(IS_OB_DATA_ADDRESS(Address));
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
    
    if(status == HAL_OK)
    {
      /* Clean the error context */
      pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
      /* Enables the Option Bytes Programming operation */
      SET_BIT(FLASH->CR, FLASH_CR_OPTPG); 
      *(__IO uint16_t*)Address = Data;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
      
      /* If the program operation is completed, disable the OPTPG Bit */
      CLEAR_BIT(FLASH->CR, FLASH_CR_OPTPG);
    }
    /* Return the Option Byte Data Program Status */
    return status;
  }
  
  /**
    * @brief  Return the FLASH Write Protection Option Bytes value.
    * @retval The FLASH Write Protection Option Bytes value
    */
  static uint32_t FLASH_OB_GetWRP(void)
  {
    /* Return the FLASH write protection Register value */
    return (uint32_t)(READ_REG(FLASH->WRPR));
  }
  
  /**
    * @brief  Returns the FLASH Read Protection level.
    * @retval FLASH RDP level
    *         This parameter can be one of the following values:
    *            @arg @ref OB_RDP_LEVEL_0 No protection
    *            @arg @ref OB_RDP_LEVEL_1 Read protection of the memory
    */
  static uint32_t FLASH_OB_GetRDP(void)
  {
    uint32_t readstatus = OB_RDP_LEVEL_0;
    uint32_t tmp_reg = 0U;
    
    /* Read RDP level bits */
    tmp_reg = READ_BIT(FLASH->OBR, FLASH_OBR_RDPRT);
  
    if (tmp_reg == FLASH_OBR_RDPRT)
    {
      readstatus = OB_RDP_LEVEL_1;
    }
    else 
    {
      readstatus = OB_RDP_LEVEL_0;
    }
  
    return readstatus;
  }
  
  /**
    * @brief  Return the FLASH User Option Byte value.
    * @retval The FLASH User Option Bytes values: FLASH_OBR_IWDG_SW(Bit2), 
    *         FLASH_OBR_nRST_STOP(Bit3),FLASH_OBR_nRST_STDBY(Bit4).
    *         And FLASH_OBR_BFB2(Bit5) for STM32F101xG and STM32F103xG . 
    */
  static uint8_t FLASH_OB_GetUser(void)
  {
    /* Return the User Option Byte */
    return (uint8_t)((READ_REG(FLASH->OBR) & FLASH_OBR_USER) >> FLASH_POSITION_IWDGSW_BIT);
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /** @addtogroup FLASH
    * @{
    */
  
  /** @addtogroup FLASH_Private_Functions
   * @{
   */
  
  /**
    * @brief  Erase the specified FLASH memory page
    * @param  PageAddress FLASH page to erase
    *         The value of this parameter depend on device used within the same series      
    * 
    * @retval None
    */
  void FLASH_PageErase(uint32_t PageAddress)
  {
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
  #if defined(FLASH_BANK2_END)
    if(PageAddress > FLASH_BANK1_END)
    { 
      /* Proceed to erase the page */
      SET_BIT(FLASH->CR2, FLASH_CR2_PER);
      WRITE_REG(FLASH->AR2, PageAddress);
      SET_BIT(FLASH->CR2, FLASH_CR2_STRT);
    }
    else
    {
  #endif /* FLASH_BANK2_END */
      /* Proceed to erase the page */
      SET_BIT(FLASH->CR, FLASH_CR_PER);
      WRITE_REG(FLASH->AR, PageAddress);
      SET_BIT(FLASH->CR, FLASH_CR_STRT);
  #if defined(FLASH_BANK2_END)
    }
  #endif /* FLASH_BANK2_END */
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* HAL_FLASH_MODULE_ENABLED */
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  