* @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.
  *         - 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; 
  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 = (FLASH->OBR & 0x000F0000) >> 16;
    
  /* 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))) << ((uint32_t)0x10));
  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_ER_PRG_TIMEOUT);
  
  if(status == FLASH_COMPLETE)
  {  
    /* Write the User Option Byte */              
    OB->USER = tmp; 
  }
  
  /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
       
  /* Return the Option Byte program Status */
  return status;
}

/**
  * @brief  Programs the FLASH brownout reset threshold level Option Byte.
  * @note   - To correctly run this function, the FLASH_OB_Unlock() function
  *           must be called before.
  *         - 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_BOR: Selects the brownout reset threshold level
  *   This parameter can be one of the following values:
  *     @arg 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 OB_BOR_LEVEL1: BOR Reset threshold levels for 1.7V - 1.8V VDD power supply
  *     @arg OB_BOR_LEVEL2: BOR Reset threshold levels for 1.9V - 2.0V VDD power supply
  *     @arg OB_BOR_LEVEL3: BOR Reset threshold levels for 2.3V - 2.4V VDD power supply
  *     @arg OB_BOR_LEVEL4: BOR Reset threshold levels for 2.55V - 2.65V VDD power supply
  *     @arg OB_BOR_LEVEL5: BOR Reset threshold levels for 2.8V - 2.9V VDD power supply
  * @retval FLASH Status: The returned value can be: 
  * FLASH_ERROR_PROGRAM, FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT.
  */
FLASH_Status FLASH_OB_BORConfig(uint8_t OB_BOR)
{
  FLASH_Status status = FLASH_COMPLETE;
  uint32_t tmp = 0, tmp1 = 0;

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

  /* Get the User Option byte register */
  tmp1 = (FLASH->OBR & 0x00700000) >> 16;
     
  /* Calculate the option byte to write */
  tmp = (uint32_t)~(OB_BOR | tmp1)<<16;
  tmp |= (OB_BOR | tmp1);
    
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
  
  if(status == FLASH_COMPLETE)
  {  
    /* Write the BOR Option Byte */            
    OB->USER = tmp; 
  }
  
  /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_ER_PRG_TIMEOUT);
        
  /* 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 >> 20);
}

/**
  * @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) != (uint8_t)OB_RDP_Level_0)
  {
    readstatus = SET;
  }
  else
  {
    readstatus = RESET;
  }
  return readstatus;
}

/**
  * @brief  Returns the FLASH BOR level.
  * @param  None
  * @retval The FLASH User Option Bytes .
  */
uint8_t FLASH_OB_GetBOR(void)
{
  /* Return the BOR level */
  return (uint8_t)((FLASH->OBR & (uint32_t)0x000F0000) >> 16);
}

/**
  * @}
  */

/** @defgroup FLASH_Group5 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->PECR |= FLASH_IT;
  }
  else
  {
    /* Disable the interrupt sources */
    FLASH->PECR &= ~(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_EOP: FLASH End of Operation flag
  *     @arg FLASH_FLAG_READY: FLASH Ready flag after low power mode
  *     @arg FLASH_FLAG_ENDHV: FLASH End of high voltage flag
  *     @arg FLASH_FLAG_WRPERR: FLASH Write protected error flag 
  *     @arg FLASH_FLAG_PGAERR: FLASH Programming Alignment error flag
  *     @arg FLASH_FLAG_SIZERR: FLASH size error flag    
  *     @arg FLASH_FLAG_OPTVERR: FLASH Option validity error 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_EOP: FLASH End of Operation flag
  *     @arg FLASH_FLAG_WRPERR: FLASH Write protected error flag 
  *     @arg FLASH_FLAG_PGAERR: FLASH Programming Alignment error flag 
  *     @arg FLASH_FLAG_SIZERR: FLASH size error flag    
  *     @arg FLASH_FLAG_OPTVERR: FLASH Option validity error 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)0xFEF0) != (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 2010 STMicroelectronics *****END OF FILE****/