text: /**
    ******************************************************************************
    * @file    stm32f37x_flash.c
    * @author  MCD Application Team
    * @version V1.0.0
    * @date    20-September-2012
    * @brief   This file provides firmware functions to manage the following 
    *          functionalities of the FLASH peripheral:
    *            - FLASH Interface configuration
    *            - FLASH Memory Programming
    *            - Option Bytes Programming
    *            - Interrupts and flags management
    *
    *  @verbatim
   ===============================================================================
                      ##### How to use this driver #####
   ===============================================================================
      [..] This driver provides functions to configure and program the Flash 
           memory of all STM32F37x devices. These functions are split in 4 groups
           (#) FLASH Interface configuration functions: this group includes the 
               management of following features:
               (++) Set the latency
               (++) Enable/Disable the Half Cycle Access
               (++) Enable/Disable the prefetch buffer
  
           (#) FLASH Memory Programming functions: this group includes all needed 
               functions to erase and program the main memory:
               (++) Lock and Unlock the Flash interface.
               (++) Erase function: Erase Page, erase all pages.
               (++) Program functions: Half Word and Word write.
  
           (#) FLASH Option Bytes Programming functions: this group includes all 
               needed functions to:
               (++) Lock and Unlock the Flash Option bytes.
               (++) Launch the Option Bytes loader
               (++) Erase the Option Bytes
               (++) Set/Reset the write protection
               (++) Set the Read protection Level
               (++) Program the user option Bytes
               (++) Set/Reset the BOOT1 bit
               (++) Enable/Disable the VDDA Analog Monitoring
               (++) Enable/Disable the VDD_SD12 Analog Monitoring
               (++) Get the user option bytes
               (++) Get the Write protection
               (++) Get the read protection status
  
           (#) FLASH Interrupts and flag management functions: this group includes 
               all needed functions to:
               (++) Enable/Disable the flash interrupt sources
               (++) Get flags status
               (++) Clear flags
               (++) Get Flash operation status
               (++) Wait for last flash operation
  
   @endverbatim
    
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
    *
    * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
    * You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at:
    *
    *        http://www.st.com/software_license_agreement_liberty_v2
    *
    * Unless required by applicable law or agreed to in writing, software 
    * distributed under the License is distributed on an "AS IS" BASIS, 
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f37x_flash.h"
  
  /** @addtogroup STM32F37x_StdPeriph_Driver
    * @{
    */
  
  /** @defgroup FLASH 
    * @brief FLASH driver modules
    * @{
    */ 
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /* Private functions ---------------------------------------------------------*/
  
  /** @defgroup FLASH_Private_Functions
    * @{
    */ 
  
  /** @defgroup FLASH_Group1 FLASH Interface configuration functions
    *  @brief   FLASH Interface configuration functions 
   *
  @verbatim   
   ===============================================================================
                 ##### FLASH Interface configuration functions #####
   ===============================================================================
  
      [..] FLASH_Interface configuration_Functions, includes the following functions:
         (+) void FLASH_SetLatency(uint32_t FLASH_Latency):
      [..] To correctly read data from Flash memory, the number of wait states (LATENCY) 
       must be correctly programmed according to the frequency of the CPU clock (HCLK) 
      [..]
          +------------------------------------------------+
          |  Wait states   |   HCLK clock frequency (MHz)  |
          |----------------|-------------------------------|
          |0WS(1CPU cycle) |       0 < HCLK <= 24          |
          |----------------|-------------------------------|
          |1WS(2CPU cycles)|       24 < HCLK <= 48         |
          |----------------|-------------------------------|
          |2WS(3CPU cycles)|       48 < HCLK <= 72         |
          +------------------------------------------------+
         (+) void FLASH_HalfCycleAccessCmd(uint32_t FLASH_HalfCycleAccess)
         (+) void FLASH_PrefetchBufferCmd(FunctionalState NewState);
      [..]
       All these functions don't need the unlock sequence.
  
  @endverbatim
    * @{
    */
   
  /**
    * @brief  Sets the code latency value.
    * @param  FLASH_Latency: specifies the FLASH Latency value.
    *          This parameter can be one of the following values:
    *            @arg FLASH_Latency_0: FLASH Zero Latency cycle
    *            @arg FLASH_Latency_1: FLASH One Latency cycle
    *            @arg FLASH_Latency_2: FLASH Two Latency cycles 
    * @retval None
    */
  void FLASH_SetLatency(uint32_t FLASH_Latency)
  {
     uint32_t tmpreg = 0;
    
    /* Check the parameters */
    assert_param(IS_FLASH_LATENCY(FLASH_Latency));
    
    /* Read the ACR register */
    tmpreg = FLASH->ACR;  
    
    /* Sets the Latency value */
    tmpreg &= (uint32_t) (~((uint32_t)FLASH_ACR_LATENCY));
    tmpreg |= FLASH_Latency;
    
    /* Write the ACR register */
    FLASH->ACR = tmpreg;
  }
  
  /**
    * @brief  Enables or disables the Half cycle flash access.
    * @param  FLASH_HalfCycleAccess: specifies the FLASH Half cycle Access mode.
    *          This parameter can be one of the following values:
    *            @arg FLASH_HalfCycleAccess_Enable: FLASH Half Cycle Enable
    *            @arg FLASH_HalfCycleAccess_Disable: FLASH Half Cycle Disable
    * @retval None
    */
  void FLASH_HalfCycleAccessCmd(FunctionalState NewState)
  {
    /* Check the parameters */
    assert_param(IS_FUNCTIONAL_STATE(NewState));
     
    if(NewState != DISABLE)
    {
      FLASH->ACR |= FLASH_ACR_HLFCYA;
    }
    else
    {
      FLASH->ACR &= (uint32_t)(~((uint32_t)FLASH_ACR_HLFCYA));
    }
  }
  
  /**
    * @brief  Enables or disables the Prefetch Buffer.
    * @param  NewState: new state of the Prefetch Buffer.
    *          This parameter  can be: ENABLE or DISABLE.
    * @retval None
    */
  void FLASH_PrefetchBufferCmd(FunctionalState NewState)
  {
    /* Check the parameters */
    assert_param(IS_FUNCTIONAL_STATE(NewState));
     
    if(NewState != DISABLE)
    {
      FLASH->ACR |= FLASH_ACR_PRFTBE;
    }
    else
    {
      FLASH->ACR &= (uint32_t)(~((uint32_t)FLASH_ACR_PRFTBE));
    }
  }
  
  /**
    * @}
    */
  
  /** @defgroup FLASH_Group2 FLASH Memory Programming functions
   *  @brief   FLASH Memory Programming functions
   *
  @verbatim   
   ===============================================================================
                  ##### FLASH Memory Programming functions #####
   ===============================================================================
  
      [..] The FLASH Memory Programming functions, includes the following functions:
         (+) void FLASH_Unlock(void);
         (+) void FLASH_Lock(void);
         (+) FLASH_Status FLASH_ErasePage(uint32_t Page_Address);
         (+) FLASH_Status FLASH_EraseAllPages(void);
         (+) FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data);
         (+) FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data);
  
      [..] Any operation of erase or program should follow these steps:
         
         (#) Call the FLASH_Unlock() function to enable the flash control register and 
             program memory access
         (#) Call the desired function to erase page or program data
         (#) Call the FLASH_Lock() to disable the flash program memory access 
        (recommended to protect the FLASH memory against possible unwanted operation)
  
  @endverbatim
    * @{
    */
  /**
    * @brief  Unlocks the FLASH control register and program memory access.
    * @param  None
    * @retval None
    */
  void FLASH_Unlock(void)
  {
    if((FLASH->CR & FLASH_CR_LOCK) != RESET)
    {
      /* Authorize the FLASH Registers access */
      FLASH->KEYR = FLASH_KEY1;
      FLASH->KEYR = FLASH_KEY2;
    }  
  }
  
  /**
    * @brief  Locks the FLASH control register access
    * @param  None
    * @retval None
    */
  void FLASH_Lock(void)
  {
    /* Set the LOCK Bit to lock the FLASH Registers access */
    FLASH->CR |= FLASH_CR_LOCK;
  }
  
  /**
    * @brief  Erases a specified page in program memory.
    * @note   To correctly run this function, the FLASH_Unlock() function must be called before.
    * @note   Call the FLASH_Lock() to disable the flash memory access 
    *         (recommended to protect the FLASH memory against possible unwanted operation)  
    * @param  Page_Address: 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 1024 bytes).
    * @retval FLASH Status: The returned value can be: 
    *         FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_ErasePage(uint32_t Page_Address)
  {
    FLASH_Status status = FLASH_COMPLETE;
  
    /* Check the parameters */
    assert_param(IS_FLASH_PROGRAM_ADDRESS(Page_Address));
   
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    { 
      /* If the previous operation is completed, proceed to erase the page */
      FLASH->CR |= FLASH_CR_PER;
      FLASH->AR  = Page_Address; 
      FLASH->CR |= FLASH_CR_STRT;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      
      /* Disable the PER Bit */
      FLASH->CR &= ~FLASH_CR_PER;
    }
      
    /* Return the Erase Status */
    return status;
  }
  
  /**
    * @brief  Erases all FLASH pages.
    * @note   To correctly run this function, the FLASH_Unlock() function
    *         must be called before.
    * @note   Call the FLASH_Lock() to disable the flash memory access 
    *         (recommended to protect the FLASH memory against possible unwanted operation)
    * @param  None              
    * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
    *         FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_EraseAllPages(void)
  {
    FLASH_Status status = FLASH_COMPLETE;
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {
      /* if the previous operation is completed, proceed to erase all pages */
       FLASH->CR |= FLASH_CR_MER;
       FLASH->CR |= FLASH_CR_STRT;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
      /* Disable the MER Bit */
      FLASH->CR &= ~FLASH_CR_MER;
    }
  
    /* Return the Erase Status */
    return status;
  }
  
  /**
    * @brief  Programs a word at a specified address.
    * @note   To correctly run this function, the FLASH_Unlock() function must be called before.
    * @note   Call the FLASH_Lock() to disable the flash memory access 
    *          (recommended to protect the FLASH memory against possible unwanted operation)   
    * @param  Address: specifies the address to be programmed.
    * @param  Data: specifies the data to be programmed.
    * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
    *         FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT. 
    */
  FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data)
  {
    FLASH_Status status = FLASH_COMPLETE;
    __IO uint32_t tmp = 0;
  
    /* Check the parameters */
    assert_param(IS_FLASH_PROGRAM_ADDRESS(Address));
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {
      /* If the previous operation is completed, proceed to program the new first 
      half word */
      FLASH->CR |= FLASH_CR_PG;
    
      *(__IO uint16_t*)Address = (uint16_t)Data;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
   
      if(status == FLASH_COMPLETE)
      {
        /* If the previous operation is completed, proceed to program the new second 
        half word */
        tmp = Address + 2;
  
        *(__IO uint16_t*) tmp = Data >> 16;
      
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
          
        /* Disable the PG Bit */
        FLASH->CR &= ~FLASH_CR_PG;
      }
      else
      {
        /* Disable the PG Bit */
        FLASH->CR &= ~FLASH_CR_PG;
      }
    }
     
    /* Return the Program Status */
    return status;
  }
  
  /**
    * @brief  Programs a half word at a specified address.
    * @note   To correctly run this function, the FLASH_Unlock() function must be called before.
    * @note   Call the FLASH_Lock() to disable the flash memory access 
    *         (recommended to protect the FLASH memory against possible unwanted operation)   
    * @param  Address: specifies the address to be programmed.
    * @param  Data: specifies the data to be programmed.
    * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
    *         FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT. 
    */
  FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data)
  {
    FLASH_Status status = FLASH_COMPLETE;
  
    /* Check the parameters */
    assert_param(IS_FLASH_PROGRAM_ADDRESS(Address));
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {
      /* If the previous operation is completed, proceed to program the new data */
      FLASH->CR |= FLASH_CR_PG;
    
      *(__IO uint16_t*)Address = Data;
  
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      
      /* Disable the PG Bit */
      FLASH->CR &= ~FLASH_CR_PG;
    } 
    
    /* Return the Program Status */
    return status;
  }
  
  /**
    * @}
    */
  
  /** @defgroup FLASH_Group3 Option Bytes Programming functions
   *  @brief   Option Bytes Programming functions 
   *
  @verbatim   
   ===============================================================================
                  ##### Option Bytes Programming functions #####
   ===============================================================================
  
      [..] The FLASH_Option Bytes Programming_functions, includes the following functions:
         (+) void FLASH_OB_Unlock(void);
         (+) void FLASH_OB_Lock(void);
         (+) void FLASH_OB_Launch(void);
         (+) FLASH_Status FLASH_OB_Erase(void);
         (+) FLASH_Status FLASH_OB_EnableWRP(uint32_t OB_WRP);
         (+) FLASH_Status FLASH_OB_RDPConfig(uint8_t OB_RDP);
         (+) FLASH_Status FLASH_OB_UserConfig(uint8_t OB_IWDG, uint8_t OB_STOP, uint8_t OB_STDBY);
         (+) FLASH_Status FLASH_OB_BOOTConfig(uint8_t OB_BOOT1);
         (+) FLASH_Status FLASH_OB_VDDAConfig(uint8_t OB_VDDA_ANALOG);
         (+) FLASH_Status FLASH_OB_VDD_SD12Config(uint8_t OB_VDD_SD12);
         (+) FLASH_Status FLASH_OB_WriteUser(uint8_t OB_USER);
         (+) uint8_t FLASH_OB_GetUser(void);
         (+) uint32_t FLASH_OB_GetWRP(void);
         (+) FlagStatus FLASH_OB_GetRDP(void);
  
      [..] Any operation of erase or program should follow these steps:
  
     (#) Call the FLASH_OB_Unlock() function to enable the Option Bytes registers access
  
     (#) Call one or several functions to program the desired option bytes 
        (++) FLASH_Status FLASH_OB_RDPConfig(uint8_t OB_RDP) => to set the desired read Protection Level
        (++) FLASH_Status FLASH_OB_EnableWRP(uint32_t OB_WRP) 
             => to Enable/Disable the desired sector write protection
        (++) FLASH_Status FLASH_OB_UserConfig(uint8_t OB_IWDG, uint8_t OB_STOP, uint8_t OB_STDBY) 
             => to configure the user option Bytes: IWDG, STOP and the Standby.
        (++) FLASH_Status FLASH_OB_BOOTConfig(uint8_t OB_BOOT1)
             => to set or reset BOOT1 
        (++) FLASH_Status FLASH_OB_VDDAConfig(uint8_t OB_VDDA_ANALOG) 
             => to enable or disable the VDDA Analog Monitoring 	
        (++) FLASH_Status FLASH_OB_VDD_SD12Config(uint8_t OB_VDD_SD12)
              => to Enable/Disable the VDD_SD12 monotoring        		 
        (++) You can write all User Options bytes at once using a single function
             by calling FLASH_Status FLASH_OB_WriteUser(uint8_t OB_USER)
  
     (#) Once all needed option bytes to be programmed are correctly written, call the
        FLASH_OB_Launch(void) function to launch the Option Bytes programming process.
  
     (#) Call the FLASH_OB_Lock() to disable the Option Bytes registers access (recommended
        to protect the option Bytes against possible unwanted operations)
  
  @endverbatim
    * @{
    */
  /**
    * @brief  Unlocks the option bytes block access.
    * @param  None
    * @retval None
    */
  void FLASH_OB_Unlock(void)
  {
    if((FLASH->CR & FLASH_CR_OPTWRE) == RESET)
    { 
      /* Unlocking the option bytes block access */
      FLASH->OPTKEYR = FLASH_OPTKEY1;
      FLASH->OPTKEYR = FLASH_OPTKEY2;
    }
  }
  
  /**
    * @brief  Locks the option bytes block access.
    * @param  None
    * @retval None
    */
  void FLASH_OB_Lock(void)
  {
    /* Set the OPTWREN Bit to lock the option bytes block access */
    FLASH->CR &= ~FLASH_CR_OPTWRE;
  }
  
  /**
    * @brief  Launch the option byte loading.
    * @param  None
    * @retval None
    */
  void FLASH_OB_Launch(void)
  {
    /* Set the OBL_Launch bit to launch the option byte loading */
    FLASH->CR |= FLASH_CR_OBL_LAUNCH;
  }
  
  /**
    * @brief  Erases the FLASH option bytes.
    * @note   To correctly run this function, the FLASH_OB_Unlock() function must be called before.
    * @note   Call the FLASH_OB_Lock() to disable the flash control register access and the option bytes 
    *         (recommended to protect the FLASH memory against possible unwanted operation)   
    * @note   This functions erases all option bytes except the Read protection (RDP).
    * @param  None
    * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
    *         FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_OB_Erase(void)
  {
    uint16_t rdptmp = OB_RDP_Level_0;
  
    FLASH_Status status = FLASH_COMPLETE;
  
    /* Get the actual read protection Option Byte value */ 
    if(FLASH_OB_GetRDP() != RESET)
    {
      rdptmp = 0x00;  
    }
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
    if(status == FLASH_COMPLETE)
    {   
      /* If the previous operation is completed, proceed to erase the option bytes */
      FLASH->CR |= FLASH_CR_OPTER;
      FLASH->CR |= FLASH_CR_STRT;
  
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      
      if(status == FLASH_COMPLETE)
      {
        /* If the erase operation is completed, disable the OPTER Bit */
        FLASH->CR &= ~FLASH_CR_OPTER;
         
        /* Enable the Option Bytes Programming operation */
        FLASH->CR |= FLASH_CR_OPTPG;
  
        /* Restore the last read protection Option Byte value */
        OB->RDP = (uint16_t)rdptmp; 
  
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
   
        if(status != FLASH_TIMEOUT)
        {
          /* if the program operation is completed, disable the OPTPG Bit */
          FLASH->CR &= ~FLASH_CR_OPTPG;
        }
      }
      else
      {
        if (status != FLASH_TIMEOUT)
        {
          /* Disable the OPTPG Bit */
          FLASH->CR &= ~FLASH_CR_OPTPG;
        }
      }  
    }
    /* Return the erase status */
    return status;
  }
  
  /**
    * @brief  Programs a half word at a specified Option Byte Data address.
    * @note   To correctly run this function, the FLASH_OB_Unlock() function must be called before.
    * @note   Call the FLASH_OB_Lock() to disable the flash control register access and the option bytes 
    *         (recommended to protect the FLASH memory against possible unwanted operation)
    * @param  Address: specifies the address to be programmed.
    *         This parameter can be 0x1FFFF804 or 0x1FFFF806. 
    * @param  Data: specifies the data to be programmed.
    * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
    *         FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_OB_ProgramData(uint32_t Address, uint8_t Data)
  {
    FLASH_Status status = FLASH_COMPLETE;
    /* Check the parameters */
    assert_param(IS_OB_DATA_ADDRESS(Address));
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
    if(status == FLASH_COMPLETE)
    {
      /* Enables the Option Bytes Programming operation */
      FLASH->CR |= FLASH_CR_OPTPG; 
      *(__IO uint16_t*)Address = Data;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      
      if(status != FLASH_TIMEOUT)
      {
        /* If the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    }
    /* Return the Option Byte Data Program Status */
    return status;
  }
  
  /**
    * @brief  Write protects the desired pages
    * @note   To correctly run this function, the FLASH_OB_Unlock() function must be called before.
    * @note   Call the FLASH_OB_Lock() to disable the flash control register access and the option bytes 
    *         (recommended to protect the FLASH memory against possible unwanted operation)    
    * @param  OB_WRP: specifies the address of the pages to be write protected.
    *          This parameter can be:
    *            @arg OB_WRP_Pages0to1..OB_WRP_Pages62to127
    *            @arg OB_WRP_AllPages
    * @retval FLASH Status: The returned value can be: 
    *         FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_OB_EnableWRP(uint32_t OB_WRP)
  {
    uint16_t WRP0_Data = 0xFFFF, WRP1_Data = 0xFFFF, WRP2_Data = 0xFFFF, WRP3_Data = 0xFFFF;
    
    FLASH_Status status = FLASH_COMPLETE;
    
    /* Check the parameters */
    assert_param(IS_OB_WRP(OB_WRP));
      
    OB_WRP = (uint32_t)(~OB_WRP);
    WRP0_Data = (uint16_t)(OB_WRP & OB_WRP0_WRP0);
    WRP1_Data = (uint16_t)((OB_WRP & OB_WRP0_nWRP0) >> 8); 
    WRP2_Data = (uint16_t)((OB_WRP & OB_WRP1_WRP1) >> 16);
    WRP3_Data = (uint16_t)((OB_WRP & OB_WRP1_nWRP1) >> 24); 
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {
      FLASH->CR |= FLASH_CR_OPTPG;
  
      if(WRP0_Data != 0xFF)
      {
        OB->WRP0 = WRP0_Data;
        
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      }
      if((status == FLASH_COMPLETE) && (WRP1_Data != 0xFF))
      {
        OB->WRP1 = WRP1_Data;
        
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      }
  	if((status == FLASH_COMPLETE) && (WRP2_Data != 0xFF))
      {
        OB->WRP2 = WRP2_Data;
        
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      }
  	if((status == FLASH_COMPLETE) && (WRP3_Data != 0xFF))
      {
        OB->WRP3 = WRP3_Data;
        
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      }
            
      if(status != FLASH_TIMEOUT)
      {
        /* if the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    } 
    /* Return the write protection operation Status */
    return status;      
  }
  
  /**
    * @brief  Enables or disables the read out protection.
    * @note   To correctly run this function, the FLASH_OB_Unlock() function must be called before.
    * @note   Call the FLASH_OB_Lock() to disable the flash control register access and the option bytes 
    *         (recommended to protect the FLASH memory against possible unwanted operation)   
    * @param  FLASH_ReadProtection_Level: specifies the read protection level. 
    *          This parameter can be:
    *             @arg OB_RDP_Level_0: No protection
    *             @arg OB_RDP_Level_1: Read protection of the memory
    *             @arg OB_RDP_Level_2: Chip protection
    * @note   When enabling OB_RDP level 2 it's no more possible to go back to level 1 or 0
    * @retval FLASH Status: The returned value can be: 
    *         FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_OB_RDPConfig(uint8_t OB_RDP)
  {
    FLASH_Status status = FLASH_COMPLETE;
    
    /* Check the parameters */
    assert_param(IS_OB_RDP(OB_RDP));
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {
      FLASH->CR |= FLASH_CR_OPTER;
      FLASH->CR |= FLASH_CR_STRT;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
      
      if(status == FLASH_COMPLETE)
      {
        /* If the erase operation is completed, disable the OPTER Bit */
        FLASH->CR &= ~FLASH_CR_OPTER;
        
        /* Enable the Option Bytes Programming operation */
        FLASH->CR |= FLASH_CR_OPTPG;
         
        OB->RDP = OB_RDP;
  
        /* Wait for last operation to be completed */
        status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT); 
      
        if(status != FLASH_TIMEOUT)
        {
          /* if the program operation is completed, disable the OPTPG Bit */
          FLASH->CR &= ~FLASH_CR_OPTPG;
        }
      }
      else 
      {
        if(status != FLASH_TIMEOUT)
        {
          /* Disable the OPTER Bit */
          FLASH->CR &= ~FLASH_CR_OPTER;
        }
      }
    }
    /* Return the protection operation Status */
    return status;
  }
  
  /**
    * @brief  Programs the FLASH User Option Byte: IWDG_SW / RST_STOP / RST_STDBY.
    * @note   To correctly run this function, the FLASH_OB_Unlock() function must be called before.
    * @note   Call the FLASH_OB_Lock() to disable the flash control register access and the option
    *         bytes (recommended to protect the FLASH memory against possible unwanted operation)
    * @param  OB_IWDG: Selects the WDG mode
    *          This parameter can be one of the following values:
    *             @arg OB_IWDG_SW: Software WDG selected
    *             @arg 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 OB_STOP_NoRST: No reset generated when entering in STOP
    *             @arg 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 OB_STDBY_NoRST: No reset generated when entering in STANDBY
    *             @arg OB_STDBY_RST: Reset generated when entering in STANDBY
    * @retval FLASH Status: The returned value can be: 
    *         FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_OB_UserConfig(uint8_t OB_IWDG, uint8_t OB_STOP, uint8_t OB_STDBY)
  {
    FLASH_Status status = FLASH_COMPLETE; 
  
    /* 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));
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {  
      /* Enable the Option Bytes Programming operation */
      FLASH->CR |= FLASH_CR_OPTPG; 
  
      OB->USER = (uint16_t)((uint16_t)(OB_IWDG | OB_STOP) | (uint16_t)(OB_STDBY | 0xF8));
    
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
      if(status != FLASH_TIMEOUT)
      {
        /* If the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    }    
    /* Return the Option Byte program Status */
    return status;
  }
  
  /**
    * @brief  Sets or resets the BOOT1 option bit.
    * @param  OB_BOOT1: Set or Reset the BOOT1 option bit.
    *          This parameter can be one of the following values:
    *             @arg OB_BOOT1_RESET: BOOT1 option bit reset
    *             @arg OB_BOOT1_SET: BOOT1 option bit set
    * @retval None
    */
  FLASH_Status FLASH_OB_BOOTConfig(uint8_t OB_BOOT1)
  {
    FLASH_Status status = FLASH_COMPLETE; 
  
    /* Check the parameters */
    assert_param(IS_OB_BOOT1(OB_BOOT1));
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {  
      /* Enable the Option Bytes Programming operation */
      FLASH->CR |= FLASH_CR_OPTPG; 
             
  	OB->USER = OB_BOOT1|0xEF;
    
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
      if(status != FLASH_TIMEOUT)
      {
        /* If the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    }    
    /* Return the Option Byte program Status */
    return status;
  }
  
  /**
    * @brief  Sets or resets the analogue monitoring on VDDA Power source. 
    * @param  OB_VDDA_ANALOG: Selects the analog monitoring on VDDA Power source.
    *          This parameter can be one of the following values:
    *             @arg OB_VDDA_ANALOG_ON: Analog monitoring on VDDA Power source ON
    *             @arg OB_VDDA_ANALOG_OFF: Analog monitoring on VDDA Power source OFF
    * @retval None
    */
  FLASH_Status FLASH_OB_VDDAConfig(uint8_t OB_VDDA_ANALOG)
  {
    FLASH_Status status = FLASH_COMPLETE; 
  
    /* Check the parameters */
    assert_param(IS_OB_VDDA_ANALOG(OB_VDDA_ANALOG));
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {  
      /* Enable the Option Bytes Programming operation */
      FLASH->CR |= FLASH_CR_OPTPG; 
  
      OB->USER = OB_VDDA_ANALOG | 0xDF;
    
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
      if(status != FLASH_TIMEOUT)
      {
        /* if the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    }    
    /* Return the Option Byte program Status */
    return status;
  }
  
  /**
    * @brief  Sets or resets the analogue monitoring on VDD_SD12 Power source. 
    * @param  OB_VDD_SD12: Selects the analog monitoring on VDD_SD12 Power source.
    *          This parameter can be one of the following values:
    *            @arg OB_VDD_SD12_ON: Analog monitoring on VDD_SD12 Power source ON
    *            @arg OB_VDD_SD12_OFF: Analog monitoring on VDD_SD12 Power source OFF
    * @retval None
    */
  FLASH_Status FLASH_OB_VDD_SD12Config(uint8_t OB_VDD_SD12)
  {
    FLASH_Status status = FLASH_COMPLETE; 
  
    /* Check the parameters */
    assert_param(IS_OB_VDD_SD12(OB_VDD_SD12));
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {  
      /* Enable the Option Bytes Programming operation */
      FLASH->CR |= FLASH_CR_OPTPG; 
             
      OB->USER = OB_VDD_SD12 | 0x7F;
    
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
      if(status != FLASH_TIMEOUT)
      {
        /* if the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    }    
    /* Return the Option Byte program Status */
    return status;
  }
  
  /**
    * @brief  Sets or resets the SRAM partiy.
    * @param  OB_SRAM_Parity: SSet or Reset the SRAM partiy enable bit.
    *          This parameter can be one of the following values:
    *             @arg OB_SRAM_PARITY_SET: Set SRAM partiy.
    *             @arg OB_SRAM_PARITY_RESET: Reset SRAM partiy.
    * @retval None
    */
  FLASH_Status FLASH_OB_SRAMParityConfig(uint8_t OB_SRAM_Parity)
  {
    FLASH_Status status = FLASH_COMPLETE; 
  
    /* Check the parameters */
    assert_param(IS_OB_SRAM_PARITY(OB_SRAM_Parity));
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {  
      /* Enable the Option Bytes Programming operation */
      FLASH->CR |= FLASH_CR_OPTPG; 
  
      OB->USER = OB_SRAM_Parity | 0xBF;
    
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
      if(status != FLASH_TIMEOUT)
      {
        /* if the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    }
    /* Return the Option Byte program Status */
    return status;
  }
  
  /**
    * @brief  Programs the FLASH User Option Byte: IWDG_SW / RST_STOP / RST_STDBY/ BOOT1 / OB_VDDA_ANALOG and
    *         OB_VDD_SD12.
    * @note   To correctly run this function, the FLASH_OB_Unlock() function
    *           must be called before.
    * @note   Call the FLASH_OB_Lock() to disable the flash control register access and the option bytes 
    *          (recommended to protect the FLASH memory against possible unwanted operation)   
    * @param  OB_USER: Selects all user option bytes
    *          This parameter is a combination of the following values:
    *            @arg OB_IWDG_SW: Software WDG selected
    *            @arg OB_IWDG_HW: Hardware WDG selected
    *            @arg OB_STOP_NoRST: No reset generated when entering in STOP
    *            @arg OB_STOP_RST: Reset generated when entering in STOP
    *            @arg OB_STDBY_NoRST: No reset generated when entering in STANDBY
    *            @arg OB_STDBY_RST: Reset generated when entering in STANDBY
    *            @arg OB_BOOT1_RESET: BOOT1 Reset
    *            @arg OB_BOOT1_SET: BOOT1 Set
    *            @arg OB_VDDA_ANALOG_ON: Analog monitoring on VDDA Power source ON
    *            @arg OB_VDDA_ANALOG_OFF: Analog monitoring on VDDA Power source OFF
    *            @arg OB_VDD_SD12_ON: Analog monitoring on VDD_SD12 Power source ON
    *            @arg OB_VDD_SD12_OFF: Analog monitoring on VDD_SD12 Power source OFF 
    * @retval FLASH Status: The returned value can be: 
    * FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_OB_WriteUser(uint8_t OB_USER)
  {
    FLASH_Status status = FLASH_COMPLETE; 
    
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
    
    if(status == FLASH_COMPLETE)
    {  
      /* Enable the Option Bytes Programming operation */
      FLASH->CR |= FLASH_CR_OPTPG; 
             
      OB->USER = OB_USER | 0x48;
    
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
      if(status != FLASH_TIMEOUT)
      {
        /* if the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= ~FLASH_CR_OPTPG;
      }
    }    
    /* Return the Option Byte program Status */
    return status;
  
  }
  
  /**
    * @brief  Returns the FLASH User Option Bytes values.
    * @param  None
    * @retval The FLASH User Option Bytes .
    */
  uint8_t FLASH_OB_GetUser(void)
  {
    /* Return the User Option Byte */
    return (uint8_t)(FLASH->OBR >> 8);
  }
  
  /**
    * @brief  Returns the FLASH Write Protection Option Bytes value.
    * @param  None
    * @retval The FLASH Write Protection Option Bytes value
    */
  uint32_t FLASH_OB_GetWRP(void)
  {
    /* Return the FLASH write protection Register value */
    return (uint32_t)(FLASH->WRPR);
  }
  
  /**
    * @brief  Checks whether the FLASH Read out Protection Status is set or not.
    * @param  None
    * @retval FLASH ReadOut Protection Status(SET or RESET)
    */
  FlagStatus FLASH_OB_GetRDP(void)
  {
    FlagStatus readstatus = RESET;
    
    if ((uint8_t)(FLASH->OBR & (FLASH_OBR_RDPRT1 | FLASH_OBR_RDPRT2)) != RESET)
    {
      readstatus = SET;
    }
    else
    {
      readstatus = RESET;
    }
    return readstatus;
  }
  
  /**
    * @}
    */
  
  /** @defgroup FLASH_Group4 Interrupts and flags management functions
   *  @brief   Interrupts and flags management functions
   *
  @verbatim   
   ===============================================================================
               ##### Interrupts and flags management functions #####
   ===============================================================================  
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Enables or disables the specified FLASH interrupts.
    * @param  FLASH_IT: specifies the FLASH interrupt sources to be enabled or 
    *         disabled.
    *          This parameter can be any combination of the following values:
    *             @arg FLASH_IT_EOP: FLASH end of programming Interrupt
    *             @arg FLASH_IT_ERR: FLASH Error Interrupt
    * @retval None 
    */
  void FLASH_ITConfig(uint32_t FLASH_IT, FunctionalState NewState)
  {
    /* Check the parameters */
    assert_param(IS_FLASH_IT(FLASH_IT)); 
    assert_param(IS_FUNCTIONAL_STATE(NewState));
    
    if(NewState != DISABLE)
    {
      /* Enable the interrupt sources */
      FLASH->CR |= FLASH_IT;
    }
    else
    {
      /* Disable the interrupt sources */
      FLASH->CR &= ~(uint32_t)FLASH_IT;
    }
  }
  
  /**
    * @brief  Checks whether the specified FLASH flag is set or not.
    * @param  FLASH_FLAG: specifies the FLASH flag to check.
    *          This parameter can be one of the following values:
    *             @arg FLASH_FLAG_BSY: FLASH write/erase operations in progress flag 
    *             @arg FLASH_FLAG_PGERR: FLASH Programming error flag flag
    *             @arg FLASH_FLAG_WRPERR: FLASH Write protected error flag
    *             @arg FLASH_FLAG_EOP: FLASH End of Programming flag
    * @retval The new state of FLASH_FLAG (SET or RESET).
    */
  FlagStatus FLASH_GetFlagStatus(uint32_t FLASH_FLAG)
  {
    FlagStatus bitstatus = RESET;
  
    /* Check the parameters */
    assert_param(IS_FLASH_GET_FLAG(FLASH_FLAG));
  
    if((FLASH->SR & FLASH_FLAG) != (uint32_t)RESET)
    {
      bitstatus = SET;
    }
    else
    {
      bitstatus = RESET;
    }
    /* Return the new state of FLASH_FLAG (SET or RESET) */
    return bitstatus; 
  }
  
  /**
    * @brief  Clears the FLASH's pending flags.
    * @param  FLASH_FLAG: specifies the FLASH flags to clear.
    *          This parameter can be any combination of the following values:
    *             @arg FLASH_FLAG_PGERR: FLASH Programming error flag flag
    *             @arg FLASH_FLAG_WRPERR: FLASH Write protected error flag
    *             @arg FLASH_FLAG_EOP: FLASH End of Programming flag
    * @retval None
    */
  void FLASH_ClearFlag(uint32_t FLASH_FLAG)
  {
    /* Check the parameters */
    assert_param(IS_FLASH_CLEAR_FLAG(FLASH_FLAG));
    
    /* Clear the flags */
    FLASH->SR = FLASH_FLAG;
  }
  
  /**
    * @brief  Returns the FLASH Status.
    * @param  None
    * @retval FLASH Status: The returned value can be: 
    *         FLASH_BUSY, FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP or FLASH_COMPLETE.
    */
  FLASH_Status FLASH_GetStatus(void)
  {
    FLASH_Status FLASHstatus = FLASH_COMPLETE;
    
    if((FLASH->SR & FLASH_FLAG_BSY) == FLASH_FLAG_BSY) 
    {
      FLASHstatus = FLASH_BUSY;
    }
    else 
    {  
      if((FLASH->SR & (uint32_t)FLASH_FLAG_WRPERR)!= (uint32_t)0x00)
      { 
        FLASHstatus = FLASH_ERROR_WRP;
      }
      else 
      {
        if((FLASH->SR & (uint32_t)(FLASH_SR_PGERR)) != (uint32_t)0x00)
        {
          FLASHstatus = FLASH_ERROR_PROGRAM; 
        }
        else
        {
          FLASHstatus = FLASH_COMPLETE;
        }
      }
    }
    /* Return the FLASH Status */
    return FLASHstatus;
  }
  
  /**
    * @brief  Waits for a FLASH operation to complete or a TIMEOUT to occur.
    * @param  Timeout: FLASH programming Timeout
    * @retval FLASH Status: The returned value can be: FLASH_BUSY, 
    *         FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
    */
  FLASH_Status FLASH_WaitForLastOperation(uint32_t Timeout)
  { 
    FLASH_Status status = FLASH_COMPLETE;
     
    /* Check for the FLASH Status */
    status = FLASH_GetStatus();
    
    /* Wait for a FLASH operation to complete or a TIMEOUT to occur */
    while((status == FLASH_BUSY) && (Timeout != 0x00))
    {
      status = FLASH_GetStatus();
      Timeout--;
    }
    
    if(Timeout == 0x00 )
    {
      status = FLASH_TIMEOUT;
    }
    /* Return the operation status */
    return status;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  