/**
  ******************************************************************************
  * @file    stm32l0xx_hal_flash_ex.c
  * @author  MCD Application Team
  * @brief   Extended FLASH HAL module driver.
  *    
  *          This file provides firmware functions to manage the following 
  *          functionalities of the internal FLASH memory:
  *            + FLASH Interface configuration
  *            + FLASH Memory Erasing
  *            + DATA EEPROM Programming/Erasing
  *            + Option Bytes Programming
  *            + Interrupts management
  *    
  @verbatim
  ==============================================================================
               ##### Flash peripheral Extended features  #####
  ==============================================================================
           
  [..] Comparing to other products, the FLASH interface for STM32L0xx
       devices contains the following additional features        
       (+) Erase functions
       (+) DATA_EEPROM memory management
       (+) BOOT option bit configuration       
       (+) PCROP protection for all sectors
   
                      ##### How to use this driver #####
  ==============================================================================
  [..] This driver provides functions to configure and program the FLASH memory 
       of all STM32L0xx. It includes:
       (+) Full DATA_EEPROM erase and program management
       (+) Boot activation
       (+) PCROP protection configuration and control for all pages
  
  @endverbatim
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2016 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.
  ******************************************************************************  
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32l0xx_hal.h"

/** @addtogroup STM32L0xx_HAL_Driver
  * @{
  */
#ifdef HAL_FLASH_MODULE_ENABLED

/** @addtogroup FLASH
  * @{
  */
/** @addtogroup FLASH_Private_Variables
 * @{
 */
/**
  * @}
  */

/**
  * @}
  */
  
/** @defgroup FLASHEx FLASHEx
  * @brief FLASH HAL Extension module driver
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup FLASHEx_Private_Constants FLASHEx Private Constants
 * @{
 */
/**
  * @}
  */

/* Private macro -------------------------------------------------------------*/
/** @defgroup FLASHEx_Private_Macros FLASHEx Private Macros
  * @{
  */
/**
  * @}
  */ 

/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup FLASHEx_Private_Functions FLASHEx Private Functions
 * @{
 */
#if defined(FLASH_OPTR_BFB2)
static HAL_StatusTypeDef  FLASH_OB_BootConfig(uint8_t OB_BOOT);
#endif /* FLASH_OPTR_BFB2 */
static HAL_StatusTypeDef  FLASH_OB_RDPConfig(uint8_t OB_RDP);
static HAL_StatusTypeDef  FLASH_OB_UserConfig(uint8_t OB_IWDG, uint8_t OB_STOP, uint8_t OB_STDBY);
static HAL_StatusTypeDef  FLASH_OB_BORConfig(uint8_t OB_BOR);
static uint8_t            FLASH_OB_GetRDP(void);
static uint8_t            FLASH_OB_GetUser(void);
static uint8_t            FLASH_OB_GetBOR(void);
static uint8_t            FLASH_OB_GetBOOTBit1(void);
static HAL_StatusTypeDef  FLASH_OB_BOOTBit1Config(uint8_t OB_BootBit1);
#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
static HAL_StatusTypeDef  FLASH_OB_ProtectedSectorsConfig(uint32_t Sector, uint32_t Sector2, uint32_t NewState);
#else
static HAL_StatusTypeDef  FLASH_OB_ProtectedSectorsConfig(uint32_t Sector, uint32_t NewState);
#endif
static uint32_t           FLASH_OB_GetWRP(void);
#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
static uint32_t           FLASH_OB_GetWRP2(void);
#endif

/**
  * @}
  */

/* 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:
    (+) HAL_FLASHEx_Erase: return only when erase has been done
    (+) HAL_FLASHEx_Erase_IT: end of erase is done when HAL_FLASH_EndOfOperationCallback 
        is called with parameter 0xFFFFFFFF

    [..] Any operation of erase should follow these steps:
    (#) Call the HAL_FLASH_Unlock() function to enable the flash control register and 
        program memory access.
    (#) Call the desired function to erase page.
    (#) Call the HAL_FLASH_Lock() to disable the flash program memory access 
       (recommended to protect the FLASH memory against possible unwanted operation).

@endverbatim
  * @{
  */
  
/**
  * @brief  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;
  uint32_t address = 0U;
  
  /* Process Locked */
  __HAL_LOCK(&pFlash);

  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);

  if (status == HAL_OK)
  {
    /*Initialization of PageError variable*/
    *PageError = 0xFFFFFFFFU;

    /* Check the parameters */
    assert_param(IS_NBPAGES(pEraseInit->NbPages));
    assert_param(IS_FLASH_TYPEERASE(pEraseInit->TypeErase));
    assert_param(IS_FLASH_PROGRAM_ADDRESS(pEraseInit->PageAddress));
    assert_param(IS_FLASH_PROGRAM_ADDRESS((pEraseInit->PageAddress & ~(FLASH_PAGE_SIZE - 1U)) + pEraseInit->NbPages * FLASH_PAGE_SIZE - 1U));

    /* 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(FLASH_TIMEOUT_VALUE);

      /* If the erase operation is completed, disable the ERASE Bit */
      CLEAR_BIT(FLASH->PECR, FLASH_PECR_PROG);
      CLEAR_BIT(FLASH->PECR, FLASH_PECR_ERASE);

      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 page erase of 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)
  *          End of erase is done when @ref HAL_FLASH_EndOfOperationCallback is called with parameter
  *          0xFFFFFFFF
  * @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;

  /* If procedure already ongoing, reject the next one */
  if (pFlash.ProcedureOnGoing != FLASH_PROC_NONE)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_NBPAGES(pEraseInit->NbPages));
  assert_param(IS_FLASH_TYPEERASE(pEraseInit->TypeErase));
  assert_param(IS_FLASH_PROGRAM_ADDRESS(pEraseInit->PageAddress));
  assert_param(IS_FLASH_PROGRAM_ADDRESS((pEraseInit->PageAddress & ~(FLASH_PAGE_SIZE - 1)) + pEraseInit->NbPages * FLASH_PAGE_SIZE - 1));

  /* Process Locked */
  __HAL_LOCK(&pFlash);

  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  if (status == HAL_OK)
  {
    /* Enable End of FLASH Operation and Error source interrupts */
    __HAL_FLASH_ENABLE_IT(FLASH_IT_EOP | FLASH_IT_ERR);
    
    pFlash.ProcedureOnGoing = FLASH_PROC_PAGEERASE;
    pFlash.NbPagesToErase = pEraseInit->NbPages;
    pFlash.Page = pEraseInit->PageAddress;

    /*Erase 1st page and wait for IT*/
    FLASH_PageErase(pEraseInit->PageAddress);
  }
  else
  {
    /* Process Unlocked */
    __HAL_UNLOCK(&pFlash);
  }

  return status;
}

/**
  * @}
  */

/** @defgroup FLASHEx_Exported_Functions_Group2 Option Bytes Programming functions
 *  @brief   Option Bytes Programming functions
 *
@verbatim   
  ==============================================================================
                ##### Option Bytes Programming functions ##### 
  ==============================================================================  

    [..] Any operation of erase or program should follow these steps:
    (#) Call the HAL_FLASH_OB_Unlock() function to enable the Flash option control 
        register access.
    (#) Call following function to program the desired option bytes.
        (++) HAL_FLASHEx_OBProgram:
         - To Enable/Disable the desired sector write protection.
         - To set the desired read Protection Level.
         - To configure the user option Bytes: IWDG, STOP and the Standby.
         - To Set the BOR level.
    (#) Once all needed option bytes to be programmed are correctly written, call the
        HAL_FLASH_OB_Launch(void) function to launch the Option Bytes programming process.
    (#) Call the HAL_FLASH_OB_Lock() to disable the Flash option control register access (recommended
        to protect the option Bytes against possible unwanted operations).

    [..] Proprietary code Read Out Protection (PcROP):
    (#) The PcROP sector is selected by using the same option bytes as the Write
        protection (nWRPi bits). As a result, these 2 options are exclusive each other.
    (#) In order to activate the PcROP (change the function of the nWRPi option bits), 
        the WPRMOD option bit must be activated.
    (#) The active value of nWRPi bits is inverted when PCROP mode is active, this
        means: if WPRMOD = 1 and nWRPi = 1 (default value), then the user sector "i"
        is read/write protected.
    (#) To activate PCROP mode for Flash sector(s), you need to call the following function:
        (++) HAL_FLASHEx_AdvOBProgram in selecting sectors to be read/write protected
        (++) HAL_FLASHEx_OB_SelectPCROP to enable the read/write protection

@endverbatim
  * @{
  */

/**
  * @brief  Program option bytes
  * @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 defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
    status = FLASH_OB_ProtectedSectorsConfig(pOBInit->WRPSector, pOBInit->WRPSector2, pOBInit->WRPState);
#else
    status = FLASH_OB_ProtectedSectorsConfig(pOBInit->WRPSector, pOBInit->WRPState);
#endif
    if (status != HAL_OK)
    {
      /* Process Unlocked */
      __HAL_UNLOCK(&pFlash);
      return status;
    }
  }
  
  /* Read protection configuration*/
  if((pOBInit->OptionType & OPTIONBYTE_RDP) == OPTIONBYTE_RDP)
  {
    status = FLASH_OB_RDPConfig(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 & OB_IWDG_SW, 
                                 pOBInit->USERConfig & OB_STOP_NORST,
                                 pOBInit->USERConfig & OB_STDBY_NORST);
    if (status != HAL_OK)
    {
      /* Process Unlocked */
      __HAL_UNLOCK(&pFlash);
      return status;
    }
  }

  /* BOR Level  configuration*/
  if((pOBInit->OptionType & OPTIONBYTE_BOR) == OPTIONBYTE_BOR)
  {
    status = FLASH_OB_BORConfig(pOBInit->BORLevel);
    if (status != HAL_OK)
    {
      /* Process Unlocked */
      __HAL_UNLOCK(&pFlash);
      return status;
    }
  }

  /* Program BOOT Bit1 config option byte */
  if ((pOBInit->OptionType & OPTIONBYTE_BOOT_BIT1) == OPTIONBYTE_BOOT_BIT1)
  {
    status = FLASH_OB_BOOTBit1Config(pOBInit->BOOTBit1Config);
  }
  /* 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 | OPTIONBYTE_BOR;

  /* Get WRP sector */
  pOBInit->WRPSector = FLASH_OB_GetWRP();

#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
  pOBInit->WRPSector2 = FLASH_OB_GetWRP2();
#endif

  /*Get RDP Level*/
  pOBInit->RDPLevel   = FLASH_OB_GetRDP();

  /*Get USER*/
  pOBInit->USERConfig = FLASH_OB_GetUser();

  /*Get BOR Level*/
  pOBInit->BORLevel   = FLASH_OB_GetBOR();

  /* Get BOOT bit 1 config OB */
  pOBInit->BOOTBit1Config = FLASH_OB_GetBOOTBit1();
}

#if defined(FLASH_OPTR_WPRMOD) || defined(FLASH_OPTR_BFB2)
    
/**
  * @brief  Program option bytes
  * @param  pAdvOBInit pointer to an FLASH_AdvOBProgramInitTypeDef structure that
  *         contains the configuration information for the programming.
  * 
  * @retval HAL_StatusTypeDef HAL Status
  */
HAL_StatusTypeDef HAL_FLASHEx_AdvOBProgram (FLASH_AdvOBProgramInitTypeDef *pAdvOBInit)
{
  HAL_StatusTypeDef status = HAL_ERROR;
  
  /* Check the parameters */
  assert_param(IS_OBEX(pAdvOBInit->OptionType));

#if defined(FLASH_OPTR_WPRMOD)
    
  /* Program PCROP option byte*/
  if ((pAdvOBInit->OptionType & OPTIONBYTE_PCROP) == OPTIONBYTE_PCROP)
  {
    /* Check the parameters */
    assert_param(IS_PCROPSTATE(pAdvOBInit->PCROPState));
#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
    status = FLASH_OB_ProtectedSectorsConfig(pAdvOBInit->PCROPSector, pAdvOBInit->PCROPSector2, pAdvOBInit->PCROPState);
#else
    status = FLASH_OB_ProtectedSectorsConfig(pAdvOBInit->PCROPSector, pAdvOBInit->PCROPState);
#endif
  }
  
#endif /* FLASH_OPTR_WPRMOD */

#if defined(FLASH_OPTR_BFB2)
    
  /* Program BOOT config option byte */
  if ((pAdvOBInit->OptionType & OPTIONBYTE_BOOTCONFIG) == OPTIONBYTE_BOOTCONFIG)
  {
    status = FLASH_OB_BootConfig(pAdvOBInit->BootConfig);
  }
  
#endif /* FLASH_OPTR_BFB2 */

  return status;
}

/**
  * @brief  Get the OBEX byte configuration
  * @param  pAdvOBInit pointer to an FLASH_AdvOBProgramInitTypeDef structure that
  *         contains the configuration information for the programming.
  * 
  * @retval None
  */
void HAL_FLASHEx_AdvOBGetConfig(FLASH_AdvOBProgramInitTypeDef *pAdvOBInit)
{
  pAdvOBInit->OptionType = 0;
  
#if defined(FLASH_OPTR_WPRMOD)
      
  pAdvOBInit->OptionType |= OPTIONBYTE_PCROP;


  /* Get PCROP state */
  pAdvOBInit->PCROPState = (FLASH->OPTR & FLASH_OPTR_WPRMOD) >> FLASH_OPTR_WPRMOD_Pos;
  /* Get PCROP protected sector */
  pAdvOBInit->PCROPSector = FLASH->WRPR;

#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
  /* Get PCROP protected sector */
  pAdvOBInit->PCROPSector2 = FLASH->WRPR2;
#endif
#endif /* FLASH_OPTR_WPRMOD */

#if defined(FLASH_OPTR_BFB2)
      
  pAdvOBInit->OptionType |= OPTIONBYTE_BOOTCONFIG;

  /* Get Boot config OB */
  pAdvOBInit->BootConfig = (FLASH->OPTR & FLASH_OPTR_BFB2) >> 16U;

#endif /* FLASH_OPTR_BFB2 */
}

#endif /* FLASH_OPTR_WPRMOD || FLASH_OPTR_BFB2 */

#if defined(FLASH_OPTR_WPRMOD)

/**
  * @brief  Select the Protection Mode (WPRMOD).
  * @note   Once WPRMOD bit is active, unprotection of a protected sector is not possible 
  * @note   Read a protected sector will set RDERR Flag and write a protected sector will set WRPERR Flag
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_FLASHEx_OB_SelectPCROP(void)
{
  HAL_StatusTypeDef status = HAL_OK;
  uint16_t tmp1 = 0;
  uint32_t tmp2 = 0;
  uint8_t optiontmp = 0;
  uint16_t optiontmp2 = 0;
  
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  /* Mask RDP Byte */
  optiontmp =  (uint8_t)(*(__IO uint8_t *)(OB_BASE)); 
  
  /* Update Option Byte */
  optiontmp2 = (uint16_t)(OB_PCROP_SELECTED | optiontmp); 
  
  /* calculate the option byte to write */
  tmp1 = (uint16_t)(~(optiontmp2 ));
  tmp2 = (uint32_t)(((uint32_t)((uint32_t)(tmp1) << 16U)) | ((uint32_t)optiontmp2));
  
  if(status == HAL_OK)
  {         
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /* program PCRop */
    OB->RDP = tmp2;
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }
  
  /* Return the Read protection operation Status */
  return status;            
}

/**
  * @brief  Deselect the Protection Mode (WPRMOD).
  * @note   Once WPRMOD bit is active, unprotection of a protected sector is not possible 
  * @note   Read a protected sector will set RDERR Flag and write a protected sector will set WRPERR Flag
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_FLASHEx_OB_DeSelectPCROP(void)
{
  HAL_StatusTypeDef status = HAL_OK;
  uint16_t tmp1 = 0;
  uint32_t tmp2 = 0;
  uint8_t optiontmp = 0;
  uint16_t optiontmp2 = 0;
  
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  /* Mask RDP Byte */
  optiontmp =  (uint8_t)(*(__IO uint8_t *)(OB_BASE)); 
  
  /* Update Option Byte */
  optiontmp2 = (uint16_t)(OB_PCROP_DESELECTED | optiontmp); 
  
  /* calculate the option byte to write */
  tmp1 = (uint16_t)(~(optiontmp2 ));
  tmp2 = (uint32_t)(((uint32_t)((uint32_t)(tmp1) << 16U)) | ((uint32_t)optiontmp2));
  
  if(status == HAL_OK)
  {         
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /* program PCRop */
    OB->RDP = tmp2;
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }
  
  /* Return the Read protection operation Status */
  return status;            
}

#endif /* FLASH_OPTR_WPRMOD */

/**
  * @}
  */

/** @defgroup FLASHEx_Exported_Functions_Group3 DATA EEPROM Programming functions
 *  @brief   DATA EEPROM Programming functions
 *
@verbatim   
 ===============================================================================
                     ##### DATA EEPROM Programming functions ##### 
 ===============================================================================  
 
    [..] Any operation of erase or program should follow these steps:
    (#) Call the HAL_FLASHEx_DATAEEPROM_Unlock() function to enable the data EEPROM access
        and Flash program erase control register access.
    (#) Call the desired function to erase or program data.
    (#) Call the HAL_FLASHEx_DATAEEPROM_Lock() to disable the data EEPROM access
        and Flash program erase control register access(recommended
        to protect the DATA_EEPROM against possible unwanted operation).

@endverbatim
  * @{
  */

/**
  * @brief  Unlocks the data memory and FLASH_PECR register access.
  * @retval HAL_StatusTypeDef HAL Status
  */
HAL_StatusTypeDef HAL_FLASHEx_DATAEEPROM_Unlock(void)
{
  uint32_t primask_bit;

  if((FLASH->PECR & FLASH_PECR_PELOCK) != RESET)
  {  
    /* Disable interrupts to avoid any interruption during unlock sequence */
    primask_bit = __get_PRIMASK();
    __disable_irq();

    /* Unlocking the Data memory and FLASH_PECR register access*/
    FLASH->PEKEYR = FLASH_PEKEY1;
    FLASH->PEKEYR = FLASH_PEKEY2;

    /* Re-enable the interrupts: restore previous priority mask */
    __set_PRIMASK(primask_bit);

    if((FLASH->PECR & FLASH_PECR_PELOCK) != RESET)
    {
      return HAL_ERROR;
    }
  }

  return HAL_OK;  
}

/**
  * @brief  Locks the Data memory and FLASH_PECR register access.
  * @retval HAL_StatusTypeDef HAL Status
  */
HAL_StatusTypeDef HAL_FLASHEx_DATAEEPROM_Lock(void)
{
  /* Set the PELOCK Bit to lock the data memory and FLASH_PECR register access */
  SET_BIT(FLASH->PECR, FLASH_PECR_PELOCK);
  
  return HAL_OK;
}

/**
  * @brief  Erase a word in data memory.
  * @param  Address specifies the address to be erased.
  * @note   To correctly run this function, the @ref HAL_FLASHEx_DATAEEPROM_Unlock() function
  *         must be called before.
  *         Call the @ref HAL_FLASHEx_DATAEEPROM_Lock() to the data EEPROM access
  *         and Flash program erase control register access(recommended to protect 
  *         the DATA_EEPROM against possible unwanted operation).
  * @retval HAL_StatusTypeDef HAL Status
  */
HAL_StatusTypeDef HAL_FLASHEx_DATAEEPROM_Erase(uint32_t Address)
{
  HAL_StatusTypeDef status = HAL_OK;
  
  /* Check the parameters */
  assert_param(IS_FLASH_DATA_ADDRESS(Address));
  
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  if(status == HAL_OK)
  {
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

      /* Write 00000000h to valid address in the data memory */
      *(__IO uint32_t *) Address = 0x00000000U;

    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }
   
  /* Return the erase status */
  return status;
}  

/**
  * @brief  Program word at a specified address
  * @note   To correctly run this function, the @ref HAL_FLASHEx_DATAEEPROM_Unlock() function
  *         must be called before.
  *         Call the @ref HAL_FLASHEx_DATAEEPROM_Unlock() to he data EEPROM access
  *         and Flash program erase control register access(recommended to protect 
  *         the DATA_EEPROM against possible unwanted operation).
  * @note   The function @ref HAL_FLASHEx_DATAEEPROM_EnableFixedTimeProgram() can be called before 
  *         this function to configure the Fixed Time Programming.
  * @param  TypeProgram  Indicate the way to program at a specified address.
  *         This parameter can be a value of @ref FLASHEx_Type_Program_Data
  * @param  Address  specifie the address to be programmed.
  * @param  Data     specifie the data to be programmed
  * 
  * @retval HAL_StatusTypeDef HAL Status
  */

HAL_StatusTypeDef HAL_FLASHEx_DATAEEPROM_Program(uint32_t TypeProgram, uint32_t Address, uint32_t Data)
{
  HAL_StatusTypeDef status;
  
  /* Process Locked */
  __HAL_LOCK(&pFlash);

  /* Check the parameters */
  assert_param(IS_TYPEPROGRAMDATA(TypeProgram));
  assert_param(IS_FLASH_DATA_ADDRESS(Address));

  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);

  if(status == HAL_OK)
  {
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    if(TypeProgram == FLASH_TYPEPROGRAMDATA_WORD)
    {
      /* Program word (32-bit) at a specified address.*/
      *(__IO uint32_t *)Address = Data;
    }
    else if(TypeProgram == FLASH_TYPEPROGRAMDATA_HALFWORD)
    {
      /* Program halfword (16-bit) at a specified address.*/
      *(__IO uint16_t *)Address = (uint16_t) Data;
    }
    else if(TypeProgram == FLASH_TYPEPROGRAMDATA_BYTE)
    {
      /* Program byte (8-bit) at a specified address.*/
      *(__IO uint8_t *)Address = (uint8_t) Data;
    }
    else
    {
      status = HAL_ERROR;
    }

    if (status == HAL_OK)
    {
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
    }
  }

  /* Process Unlocked */
  __HAL_UNLOCK(&pFlash);

  return status;
}

/**
  * @brief  Enable DATA EEPROM fixed Time programming (2*Tprog).
  * @retval None
  */
void HAL_FLASHEx_DATAEEPROM_EnableFixedTimeProgram(void)
{
  SET_BIT(FLASH->PECR, FLASH_PECR_FIX);
}

/**
  * @brief  Disables DATA EEPROM fixed Time programming (2*Tprog).
  * @retval None
  */
void HAL_FLASHEx_DATAEEPROM_DisableFixedTimeProgram(void)
{
  CLEAR_BIT(FLASH->PECR, FLASH_PECR_FIX);
}

/**
  * @}
  */

/**
  * @}
  */

/** @addtogroup FLASHEx_Private_Functions
 * @{
 */

/*
==============================================================================
              OPTIONS BYTES
==============================================================================
*/
/**
  * @brief  Enables or disables the read out protection.
  * @note   To correctly run this function, the @ref HAL_FLASH_OB_Unlock() function
  *         must be called before.
  * @param  OB_RDP specifies the read protection level. 
  *   This parameter can be:
  *     @arg @ref OB_RDP_LEVEL_0 No protection
  *     @arg @ref OB_RDP_LEVEL_1 Read protection of the memory
  *     @arg @ref OB_RDP_LEVEL_2 Chip protection
  * 
  *  !!!Warning!!! When enabling OB_RDP_LEVEL_2 it's no more possible to go back to level 1 or 0
  *   
  * @retval HAL status
  */
static HAL_StatusTypeDef FLASH_OB_RDPConfig(uint8_t OB_RDP)
{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t tmp1, tmp2;

  /* Check the parameters */
  assert_param(IS_OB_RDP(OB_RDP));

  tmp1 = (uint32_t)(OB->RDP & ((~FLASH_OPTR_RDPROT) & 0x0000FFFF));

  /* Calculate the option byte to write */
  tmp1 |= (uint32_t)(OB_RDP);
  tmp2 = (uint32_t)(((uint32_t)((uint32_t)(~tmp1) << 16U)) | tmp1);

  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);

  if(status == HAL_OK)
  {
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /* program read protection level */
    OB->RDP = tmp2;

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }

  /* Return the Read protection operation Status */
  return status;
}

/**
  * @brief  Programs the FLASH brownout reset threshold level Option Byte.
  * @param  OB_BOR Selects the brownout reset threshold level.
  *   This parameter can be one of the following values:
  *     @arg @ref OB_BOR_OFF BOR is disabled at power down, the reset is asserted when the VDD 
  *                      power supply reaches the PDR(Power Down Reset) threshold (1.5V)
  *     @arg @ref OB_BOR_LEVEL1 BOR Reset threshold levels for 1.7V - 1.8V VDD power supply
  *     @arg @ref OB_BOR_LEVEL2 BOR Reset threshold levels for 1.9V - 2.0V VDD power supply
  *     @arg @ref OB_BOR_LEVEL3 BOR Reset threshold levels for 2.3V - 2.4V VDD power supply
  *     @arg @ref OB_BOR_LEVEL4 BOR Reset threshold levels for 2.55V - 2.65V VDD power supply
  *     @arg @ref OB_BOR_LEVEL5 BOR Reset threshold levels for 2.8V - 2.9V VDD power supply
  * @retval HAL status
  */
static HAL_StatusTypeDef FLASH_OB_BORConfig(uint8_t OB_BOR)
{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t tmp = 0, tmp1 = 0;

  /* Check the parameters */
  assert_param(IS_OB_BOR_LEVEL(OB_BOR));

  /* Get the User Option byte register */
  tmp1 = OB->USER & ((~FLASH_OPTR_BOR_LEV) >> 16U);

  /* Calculate the option byte to write - [0xFF | nUSER | 0x00 | USER]*/
  tmp = (uint32_t)~((OB_BOR | tmp1)) << 16U;
  tmp |= (OB_BOR | tmp1);
    
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  if(status == HAL_OK)
  {  
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /* Write the BOR Option Byte */            
    OB->USER = tmp;

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }
  
  /* Return the Option Byte BOR programming Status */
  return status;
}

/**
  * @brief  Sets or resets the BOOT bit1 option bit.
  * @param  OB_BootBit1 Set or Reset the BOOT bit1 option bit.
  *          This parameter can be one of the following values:
  *             @arg @ref OB_BOOT_BIT1_RESET BOOT1 option bit reset
  *             @arg @ref OB_BOOT_BIT1_SET BOOT1 option bit set
  * @retval HAL status
  */
static HAL_StatusTypeDef  FLASH_OB_BOOTBit1Config(uint8_t OB_BootBit1)
{
  HAL_StatusTypeDef status = HAL_OK; 
  uint32_t tmp = 0, tmp1 = 0, OB_Bits = ((uint32_t) OB_BootBit1) << 15;

  /* Check the parameters */
  assert_param(IS_OB_BOOT1(OB_BootBit1));

  /* Get the User Option byte register */
  tmp1 = OB->USER & ((~FLASH_OPTR_BOOT1) >> 16U);

  /* Calculate the user option byte to write */ 
  tmp = (~(OB_Bits | tmp1)) << 16U;
  tmp |= OB_Bits | tmp1;
    
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  if(status == HAL_OK)
  {  
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
    /* Program OB */
    OB->USER = tmp; 
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }

  return status;
}

/**
  * @brief  Returns the FLASH User Option Bytes values.
  * @retval The FLASH User Option Bytes.
  */
static uint8_t FLASH_OB_GetUser(void)
{
  /* Return the User Option Byte */
  return (uint8_t)((FLASH->OPTR & FLASH_OPTR_USER) >> 16U);
}

/**
  * @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
  *            @arg @ref OB_RDP_LEVEL_2 Full chip protection
  */
static uint8_t FLASH_OB_GetRDP(void)
{
  uint8_t rdp_level = READ_BIT(FLASH->OPTR, FLASH_OPTR_RDPROT);

  if ((rdp_level != OB_RDP_LEVEL_0) && (rdp_level != OB_RDP_LEVEL_2))
  {
    return (OB_RDP_LEVEL_1);
  }
  else
  {
    return rdp_level;
  }
}

/**
  * @brief  Returns the FLASH BOR level.
  * @retval The BOR level Option Bytes.
  */
static uint8_t FLASH_OB_GetBOR(void)
{
  /* Return the BOR level */
  return (uint8_t)((FLASH->OPTR & (uint32_t)FLASH_OPTR_BOR_LEV) >> 16U);
}

/**
  * @brief  Returns the FLASH BOOT bit1 value.
  * @retval The BOOT bit 1 value Option Bytes.
  */
static uint8_t FLASH_OB_GetBOOTBit1(void)
{
  /* Return the BOR level */
  return (FLASH->OPTR & FLASH_OPTR_BOOT1) >> FLASH_OPTR_BOOT1_Pos;

}

/**
  * @brief  Returns 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)(FLASH->WRPR);
}

#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
/**
  * @brief  Returns the FLASH Write Protection Option Bytes value.
  * @retval The FLASH Write Protection Option Bytes value.
  */
static uint32_t FLASH_OB_GetWRP2(void)
{
  /* Return the FLASH write protection Register value */
  return (uint32_t)(FLASH->WRPR2);
}
#endif /* STM32L071xx || STM32L072xx || STM32L073xx || STM32L081xx || STM32L082xx || STM32L083xx */

#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)
/**
  * @brief  Write Option Byte of the desired pages of the Flash.
  * @param  Sector specifies the sectors to be write protected.
  * @param  Sector2 specifies the sectors to be write protected (only stm32l07xxx and stm32l08xxx devices)
  * @param  NewState new state of the specified FLASH Pages Write protection.
  *   This parameter can be: 
  *        @arg @ref OB_WRPSTATE_ENABLE
  *        @arg @ref OB_WRPSTATE_DISABLE
  * @retval HAL_StatusTypeDef
  */
static HAL_StatusTypeDef FLASH_OB_ProtectedSectorsConfig(uint32_t Sector, uint32_t Sector2, uint32_t NewState)
#else
/**
  * @brief  Write Option Byte of the desired pages of the Flash.
  * @param  Sector specifies the sectors to be write protected.
  * @param  NewState new state of the specified FLASH Pages Write protection.
  *   This parameter can be: 
  *        @arg @ref OB_WRPSTATE_ENABLE
  *        @arg @ref OB_WRPSTATE_DISABLE
  * @retval HAL_StatusTypeDef
  */
static HAL_StatusTypeDef FLASH_OB_ProtectedSectorsConfig(uint32_t Sector, uint32_t NewState)
#endif
{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t WRP_Data = 0;
  uint32_t OB_WRP = Sector;
  
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
 
  if(status == HAL_OK)
  {
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /* Update WRP only if at least 1 selected sector */
    if (OB_WRP != 0x00000000U)
    {
      if ((OB_WRP & WRP_MASK_LOW) != 0x00000000U)
      {
        if (NewState != OB_WRPSTATE_DISABLE)
        {
          WRP_Data = (uint16_t)(((OB_WRP & WRP_MASK_LOW) | OB->WRP01));
          OB->WRP01 = (uint32_t)(~(WRP_Data) << 16U) | (WRP_Data);
        }             
        else
        {
          WRP_Data = (uint16_t)(~OB_WRP & (WRP_MASK_LOW & OB->WRP01));
          OB->WRP01 =  (uint32_t)((~WRP_Data) << 16U) | (WRP_Data);
        }
      }
    }
#if defined(STM32L071xx) || defined(STM32L072xx) || defined(STM32L073xx) || defined(STM32L081xx) || defined(STM32L082xx) || defined(STM32L083xx)  
    /* Update WRP only if at least 1 selected sector */
    if (OB_WRP != 0x00000000U)
    {
      if ((OB_WRP & WRP_MASK_HIGH) != 0x00000000U)
      {
        if (NewState != OB_WRPSTATE_DISABLE)
        {
          WRP_Data = (uint16_t)((((OB_WRP & WRP_MASK_HIGH) >> 16U | OB->WRP23))); 
          OB->WRP23 = (uint32_t)(~(WRP_Data) << 16U) | (WRP_Data);
        }             
        else
        {
          WRP_Data = (uint16_t)((((~OB_WRP & WRP_MASK_HIGH) >> 16U & OB->WRP23))); 
          OB->WRP23 = (uint32_t)((~WRP_Data) << 16U) | (WRP_Data);
        } 
      }
    }

    OB_WRP = Sector2;
    /* Update WRP only if at least 1 selected sector */
    if (OB_WRP != 0x00000000U)
    {
      if ((OB_WRP & WRP_MASK_LOW) != 0x00000000U)
      {
        if (NewState != OB_WRPSTATE_DISABLE)
        {
          WRP_Data = (uint16_t)(((OB_WRP & WRP_MASK_LOW) | OB->WRP45));
          OB->WRP45 =(uint32_t)(~(WRP_Data) << 16U) | (WRP_Data);
        }             
        else
        {
          WRP_Data = (uint16_t)(~OB_WRP & (WRP_MASK_LOW & OB->WRP45));
          OB->WRP45 = (uint32_t)((~WRP_Data) << 16U) | (WRP_Data);
        }
      }
    }
#endif /* STM32L071xx || STM32L072xx || STM32L073xx || STM32L081xx || STM32L082xx || STM32L083xx */
  }
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);

  /* Return the write protection operation Status */
  return status;      
}

/**
  * @brief  Programs the FLASH User Option Byte: IWDG_SW / RST_STOP / RST_STDBY.
  * @param  OB_IWDG Selects the WDG mode.
  *   This parameter can be one of the following values:
  *     @arg @ref OB_IWDG_SW Software WDG selected
  *     @arg @ref OB_IWDG_HW Hardware WDG selected
  * @param  OB_STOP Reset event when entering STOP mode.
  *   This parameter can be one of the following values:
  *     @arg @ref OB_STOP_NORST No reset generated when entering in STOP
  *     @arg @ref OB_STOP_RST Reset generated when entering in STOP
  * @param  OB_STDBY Reset event when entering Standby mode.
  *   This parameter can be one of the following values:
  *     @arg @ref OB_STDBY_NORST No reset generated when entering in STANDBY
  *     @arg @ref OB_STDBY_RST Reset generated when entering in STANDBY
  * @retval HAL status
  */
static HAL_StatusTypeDef FLASH_OB_UserConfig(uint8_t OB_IWDG, uint8_t OB_STOP, uint8_t OB_STDBY)
{
  HAL_StatusTypeDef status = HAL_OK; 
  uint32_t tmp = 0, tmp1 = 0;

  /* Check the parameters */
  assert_param(IS_OB_IWDG_SOURCE(OB_IWDG));
  assert_param(IS_OB_STOP_SOURCE(OB_STOP));
  assert_param(IS_OB_STDBY_SOURCE(OB_STDBY));

  /* Get the User Option byte register */
  tmp1 = OB->USER & ((~FLASH_OPTR_USER) >> 16U);

  /* Calculate the user option byte to write */ 
  tmp = (uint32_t)(((uint32_t)~((uint32_t)((uint32_t)(OB_IWDG) | (uint32_t)(OB_STOP) | (uint32_t)(OB_STDBY) | tmp1))) << 16U);
  tmp |= ((uint32_t)(OB_IWDG) | ((uint32_t)OB_STOP) | (uint32_t)(OB_STDBY) | tmp1);
  
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  if(status == HAL_OK)
  {  
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /* Write the User Option Byte */
    OB->USER = tmp;
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }

  /* Return the Option Byte program Status */
  return status;
}

#if defined(FLASH_OPTR_BFB2)
/**
  * @brief  Configures to boot from Bank1 or Bank2.
  * @param  OB_BOOT select the FLASH Bank to boot from.
  *   This parameter can be one of the following values:
  *          This parameter can be one of the following values:
  *             @arg @ref OB_BOOT_BANK1 BFB2 option bit reset
  *             @arg @ref OB_BOOT_BANK2 BFB2 option bit set
  * @retval HAL status
  */
static HAL_StatusTypeDef FLASH_OB_BootConfig(uint8_t OB_BOOT)
{
  HAL_StatusTypeDef status = HAL_OK; 
  uint32_t tmp = 0U, tmp1 = 0U;

  /* Check the parameters */
  assert_param(IS_OB_BOOT_BANK(OB_BOOT));

  /* Get the User Option byte register  and BOR Level*/
  tmp1 = OB->USER & ((~FLASH_OPTR_BFB2) >> 16U);

  /* Calculate the option byte to write */
  tmp = (uint32_t)~(OB_BOOT | tmp1) << 16U;
  tmp |= (OB_BOOT | tmp1);

  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);

  if(status == HAL_OK)
  {  
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /* Write the BOOT Option Byte */
    OB->USER = tmp;
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }

  /* Return the Option Byte program Status */
  return status;
}

#endif /* FLASH_OPTR_BFB2 */

/**
  * @}
  */

/**
  * @}
  */

/** @addtogroup FLASH
  * @{
  */


/** @addtogroup FLASH_Private_Functions
 * @{
 */

/**
  * @brief  Erases a specified page in program memory.
  * @param  PageAddress The page address in program memory to be erased.
  * @note   A Page is erased in the Program memory only if the address to load 
  *         is the start address of a page (multiple of @ref FLASH_PAGE_SIZE bytes).
  * @retval None
  */
void FLASH_PageErase(uint32_t PageAddress)
{
  /* Clean the error context */
  pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

  /* Set the ERASE bit */
  SET_BIT(FLASH->PECR, FLASH_PECR_ERASE);

  /* Set PROG bit */
  SET_BIT(FLASH->PECR, FLASH_PECR_PROG);

  /* Write 00000000h to the first word of the program page to erase */
  *(__IO uint32_t *)(uint32_t)(PageAddress & ~(FLASH_PAGE_SIZE - 1)) = 0x00000000;
}
  
/**
  * @}
  */

/**
  * @}
  */

#endif /* HAL_FLASH_MODULE_ENABLED */
/**
  * @}
  */

