/* if the program operation is completed, disable the OPTPG Bit */
      FLASH->CR &= CR_OPTPG_Reset;
    }
  }    
  /* Return the Option Byte Data Program Status */
  return status;
}

/**
  * @brief  Write protects the desired pages
  * @param  FLASH_Pages: specifies the address of the pages to be write protected.
  *   This parameter can be:
  *     @arg For @b STM32_Low-density_devices: value between FLASH_WRProt_Pages0to3 and FLASH_WRProt_Pages28to31  
  *     @arg For @b STM32_Medium-density_devices: value between FLASH_WRProt_Pages0to3
  *       and FLASH_WRProt_Pages124to127
  *     @arg For @b STM32_High-density_devices: value between FLASH_WRProt_Pages0to1 and
  *       FLASH_WRProt_Pages60to61 or FLASH_WRProt_Pages62to255
  *     @arg For @b STM32_Connectivity_line_devices: value between FLASH_WRProt_Pages0to1 and
  *       FLASH_WRProt_Pages60to61 or FLASH_WRProt_Pages62to127    
  *     @arg FLASH_WRProt_AllPages
  * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
  *   FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
  */
FLASH_Status FLASH_EnableWriteProtection(uint32_t FLASH_Pages)
{
  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_FLASH_WRPROT_PAGE(FLASH_Pages));
  
  FLASH_Pages = (uint32_t)(~FLASH_Pages);
  WRP0_Data = (uint16_t)(FLASH_Pages & WRP0_Mask);
  WRP1_Data = (uint16_t)((FLASH_Pages & WRP1_Mask) >> 8);
  WRP2_Data = (uint16_t)((FLASH_Pages & WRP2_Mask) >> 16);
  WRP3_Data = (uint16_t)((FLASH_Pages & WRP3_Mask) >> 24);
  
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(ProgramTimeout);
  
  if(status == FLASH_COMPLETE)
  {
    /* Authorizes the small information block programming */
    FLASH->OPTKEYR = FLASH_KEY1;
    FLASH->OPTKEYR = FLASH_KEY2;
    FLASH->CR |= CR_OPTPG_Set;
    if(WRP0_Data != 0xFF)
    {
      OB->WRP0 = WRP0_Data;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(ProgramTimeout);
    }
    if((status == FLASH_COMPLETE) && (WRP1_Data != 0xFF))
    {
      OB->WRP1 = WRP1_Data;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(ProgramTimeout);
    }
    if((status == FLASH_COMPLETE) && (WRP2_Data != 0xFF))
    {
      OB->WRP2 = WRP2_Data;
      
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(ProgramTimeout);
    }
    
    if((status == FLASH_COMPLETE)&& (WRP3_Data != 0xFF))
    {
      OB->WRP3 = WRP3_Data;
     
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(ProgramTimeout);
    }
          
    if(status != FLASH_TIMEOUT)
    {
      /* if the program operation is completed, disable the OPTPG Bit */
      FLASH->CR &= CR_OPTPG_Reset;
    }
  } 
  /* Return the write protection operation Status */
  return status;       
}

/**
  * @brief  Enables or disables the read out protection.
  * @note   If the user has already programmed the other option bytes before calling 
  *   this function, he must re-program them since this function erases all option bytes.
  * @param  Newstate: new state of the ReadOut Protection.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
  *   FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
  */
FLASH_Status FLASH_ReadOutProtection(FunctionalState NewState)
{
  FLASH_Status status = FLASH_COMPLETE;
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  status = FLASH_WaitForLastOperation(EraseTimeout);
  if(status == FLASH_COMPLETE)
  {
    /* Authorizes the small information block programming */
    FLASH->OPTKEYR = FLASH_KEY1;
    FLASH->OPTKEYR = FLASH_KEY2;
    FLASH->CR |= CR_OPTER_Set;
    FLASH->CR |= CR_STRT_Set;
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(EraseTimeout);
    if(status == FLASH_COMPLETE)
    {
      /* if the erase operation is completed, disable the OPTER Bit */
      FLASH->CR &= CR_OPTER_Reset;
      /* Enable the Option Bytes Programming operation */
      FLASH->CR |= CR_OPTPG_Set; 
      if(NewState != DISABLE)
      {
        OB->RDP = 0x00;
      }
      else
      {
        OB->RDP = RDP_Key;  
      }
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(EraseTimeout); 
    
      if(status != FLASH_TIMEOUT)
      {
        /* if the program operation is completed, disable the OPTPG Bit */
        FLASH->CR &= CR_OPTPG_Reset;
      }
    }
    else 
    {
      if(status != FLASH_TIMEOUT)
      {
        /* Disable the OPTER Bit */
        FLASH->CR &= CR_OPTER_Reset;
      }
    }
  }
  /* Return the protection operation Status */
  return status;      
}

/**
  * @brief  Programs the FLASH User Option Byte: IWDG_SW / RST_STOP / RST_STDBY.
  * @param  OB_IWDG: Selects the IWDG mode
  *   This parameter can be one of the following values:
  *     @arg OB_IWDG_SW: Software IWDG selected
  *     @arg OB_IWDG_HW: Hardware IWDG 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_PG, 
  * FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
  */
FLASH_Status FLASH_UserOptionByteConfig(uint16_t OB_IWDG, uint16_t OB_STOP, uint16_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));

  /* Authorize the small information block programming */
  FLASH->OPTKEYR = FLASH_KEY1;
  FLASH->OPTKEYR = FLASH_KEY2;
  
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(ProgramTimeout);
  
  if(status == FLASH_COMPLETE)
  {  
    /* Enable the Option Bytes Programming operation */
    FLASH->CR |= CR_OPTPG_Set; 
           
    OB->USER = OB_IWDG | (uint16_t)(OB_STOP | (uint16_t)(OB_STDBY | ((uint16_t)0xF8))); 
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(ProgramTimeout);
    if(status != FLASH_TIMEOUT)
    {
      /* if the program operation is completed, disable the OPTPG Bit */
      FLASH->CR &= CR_OPTPG_Reset;
    }
  }    
  /* Return the Option Byte program Status */
  return status;
}

/**
  * @brief  Returns the FLASH User Option Bytes values.
  * @param  None
  * @retval The FLASH User Option Bytes values:IWDG_SW(Bit0), RST_STOP(Bit1)
  *   and RST_STDBY(Bit2).
  */
uint32_t FLASH_GetUserOptionByte(void)
{
  /* Return the User Option Byte */
  return (uint32_t)(FLASH->OBR >> 2);
}

/**
  * @brief  Returns the FLASH Write Protection Option Bytes Register value.
  * @param  None
  * @retval The FLASH Write Protection  Option Bytes Register value
  */
uint32_t FLASH_GetWriteProtectionOptionByte(void)
{
  /* Return the Falsh 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_GetReadOutProtectionStatus(void)
{
  FlagStatus readoutstatus = RESET;
  if ((FLASH->OBR & RDPRT_Mask) != (uint32_t)RESET)
  {
    readoutstatus = SET;
  }
  else
  {
    readoutstatus = RESET;
  }
  return readoutstatus;
}

/**
  * @brief  Checks whether the FLASH Prefetch Buffer status is set or not.
  * @param  None
  * @retval FLASH Prefetch Buffer Status (SET or RESET).
  */
FlagStatus FLASH_GetPrefetchBufferStatus(void)
{
  FlagStatus bitstatus = RESET;
  
  if ((FLASH->ACR & ACR_PRFTBS_Mask) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  /* Return the new state of FLASH Prefetch Buffer Status (SET or RESET) */
  return bitstatus; 
}

/**
  * @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_ERROR: FLASH Error Interrupt
  *     @arg FLASH_IT_EOP: FLASH end of operation Interrupt
  * @param  NewState: new state of the specified Flash interrupts.
  *   This parameter can be: ENABLE or DISABLE.      
  * @retval None 
  */
void FLASH_ITConfig(uint16_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 Busy flag           
  *     @arg FLASH_FLAG_PGERR: FLASH Program error flag       
  *     @arg FLASH_FLAG_WRPRTERR: FLASH Write protected error flag      
  *     @arg FLASH_FLAG_EOP: FLASH End of Operation flag           
  *     @arg FLASH_FLAG_OPTERR:  FLASH Option Byte error flag     
  * @retval The new state of FLASH_FLAG (SET or RESET).
  */
FlagStatus FLASH_GetFlagStatus(uint16_t FLASH_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_FLASH_GET_FLAG(FLASH_FLAG)) ;
  if(FLASH_FLAG == FLASH_FLAG_OPTERR) 
  {
    if((FLASH->OBR & FLASH_FLAG_OPTERR) != (uint32_t)RESET)
    {
      bitstatus = SET;
    }
    else
    {
      bitstatus = RESET;
    }
  }
  else
  {
   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抯 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 Program error flag       
  *     @arg FLASH_FLAG_WRPRTERR: FLASH Write protected error flag      
  *     @arg FLASH_FLAG_EOP: FLASH End of Operation flag           
  * @retval None
  */
void FLASH_ClearFlag(uint16_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_PG,
  *   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 & FLASH_FLAG_PGERR) != 0)
    { 
      flashstatus = FLASH_ERROR_PG;
    }
    else 
    {
      if((FLASH->SR & FLASH_FLAG_WRPRTERR) != 0 )
      {
        flashstatus = FLASH_ERROR_WRP;
      }
      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 progamming Timeout
  * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
  *   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))
  {
    delay();
    status = FLASH_GetStatus();
    Timeout--;
  }
  if(Timeout == 0x00 )
  {
    status = FLASH_TIMEOUT;
  }
  /* Return the operation status */
  return status;
}

/**
  * @brief  Inserts a time delay.
  * @param  None
  * @retval None
  */
static void delay(void)
{
  __IO uint32_t i = 0;
  for(i = 0xFF; i != 0; i--)
  {
  }
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/