*                     - OB_STDBY_RST: Reset generated when entering in STANDBY
* Output         : None
* Return         : FLASH Status: The returned value can be: FLASH_BUSY, 
*                  FLASH_ERROR_PG or FLASH_ERROR_WRP or FLASH_COMPLETE or 
*                  FLASH_TIMEOUT.
*******************************************************************************/
FLASH_Status FLASH_UserOptionByteConfig(u16 OB_IWDG, u16 OB_STOP, u16 OB_STDBY)
{
  FLASH_Status status = FLASH_COMPLETE; 

  /* Check the parameters */
  assert(IS_OB_IWDG_SOURCE(OB_IWDG));
  assert(IS_OB_STOP_SOURCE(OB_STOP));
  assert(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 | OB_STOP |OB_STDBY) | (u16)0xF8; 
  
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(ProgramTimeout);

    if(status != FLASH_BUSY)
    {
      /* if the program operation is completed, disable the OPTPG Bit */
      FLASH->CR &= CR_OPTPG_Reset;
    }
  }    
  /* Return the Option Byte program Status */
  return status;
}

/*******************************************************************************
* Function Name  : FLASH_GetUserOptionByte
* Description    : Returns the FLASH User Option Bytes values.
* Input          : None
* Output         : None
* Return         : The FLASH User Option Bytes values:IWDG_SW(Bit0), RST_STOP(Bit1)
*                  and RST_STDBY(Bit2).
*******************************************************************************/
u32 FLASH_GetUserOptionByte(void)
{
  /* Return the User Option Byte */
  return (u32)(FLASH->OBR >> 2);
}

/*******************************************************************************
* Function Name  : FLASH_GetWriteProtectionOptionByte
* Description    : Returns the FLASH Write Protection Option Bytes Register value.
* Input          : None
* Output         : None
* Return         : The FLASH Write Protection  Option Bytes Register value
*******************************************************************************/
u32 FLASH_GetWriteProtectionOptionByte(void)
{
  /* Return the Falsh write protection Register value */
  return (u32)(FLASH->WRPR);
}

/*******************************************************************************
* Function Name  : FLASH_GetReadOutProtectionStatus
* Description    : Checks whether the FLASH Read Out Protection Status is set 
*                  or not.
* Input          : None
* Output         : None
* Return         : FLASH ReadOut Protection Status(SET or RESET)
*******************************************************************************/
FlagStatus FLASH_GetReadOutProtectionStatus(void)
{
  FlagStatus readoutstatus = RESET;

  if ((FLASH->OBR & RDPRT_Mask) != (u32)RESET)
  {
    readoutstatus = SET;
  }
  else
  {
    readoutstatus = RESET;
  }
  return readoutstatus;
}

/*******************************************************************************
* Function Name  : FLASH_GetPrefetchBufferStatus
* Description    : Checks whether the FLASH Prefetch Buffer status is set or not.
* Input          : None
* Output         : None
* Return         : FLASH Prefetch Buffer Status (SET or RESET).
*******************************************************************************/
FlagStatus FLASH_GetPrefetchBufferStatus(void)
{
  FlagStatus bitstatus = RESET;
  
  if ((FLASH->ACR & ACR_PRFTBS_Mask) != (u32)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  /* Return the new state of FLASH Prefetch Buffer Status (SET or RESET) */
  return bitstatus; 
}

/*******************************************************************************
* Function Name  : FLASH_ITConfig
* Description    : Enables or disables the specified FLASH interrupts.
* Input          : - FLASH_IT: specifies the FLASH interrupt sources to be 
*                    enabled or disabled.
*                    This parameter can be any combination of the following values:
*                       - FLASH_IT_ERROR: FLASH Error Interrupt
*                       - FLASH_IT_EOP: FLASH end of operation Interrupt
* Output         : None
* Return         : None 
*******************************************************************************/
void FLASH_ITConfig(u16 FLASH_IT, FunctionalState NewState)
{
  /* Check the parameters */
  assert(IS_FLASH_IT(FLASH_IT)); 
  assert(IS_FUNCTIONAL_STATE(NewState));

  if(NewState != DISABLE)
  {
    /* Enable the interrupt sources */
    FLASH->CR |= FLASH_IT;
  }
  else
  {
    /* Disable the interrupt sources */
    FLASH->CR &= ~(u32)FLASH_IT;
  }
}

/*******************************************************************************
* Function Name  : FLASH_GetFlagStatus
* Description    : Checks whether the specified FLASH flag is set or not.
* Input          : - FLASH_FLAG: specifies the FLASH flag to check.
*                     This parameter can be one of the following values:
*                    - FLASH_FLAG_BSY: FLASH Busy flag           
*                    - FLASH_FLAG_PGERR: FLASH Program error flag       
*                    - FLASH_FLAG_WRPRTERR: FLASH Write protected error flag      
*                    - FLASH_FLAG_EOP: FLASH End of Operation flag           
*                    - FLASH_FLAG_OPTERR:  FLASH Option Byte error flag     
* Output         : None
* Return         : The new state of FLASH_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus FLASH_GetFlagStatus(u16 FLASH_FLAG)
{
  FlagStatus bitstatus = RESET;

  /* Check the parameters */
  assert(IS_FLASH_GET_FLAG(FLASH_FLAG)) ;

  if(FLASH_FLAG == FLASH_FLAG_OPTERR) 
  {
    if((FLASH->OBR & FLASH_FLAG_OPTERR) != (u32)RESET)
    {
      bitstatus = SET;
    }
    else
    {
      bitstatus = RESET;
    }
  }
  else
  {
   if((FLASH->SR & FLASH_FLAG) != (u32)RESET)
    {
      bitstatus = SET;
    }
    else
    {
      bitstatus = RESET;
    }
  }
  /* Return the new state of FLASH_FLAG (SET or RESET) */
  return bitstatus;
}

/*******************************************************************************
* Function Name  : FLASH_ClearFlag
* Description    : Clears the FLASH抯 pending flags.
* Input          : - FLASH_FLAG: specifies the FLASH flags to clear.
*                    This parameter can be any combination of the following values:
*                    - FLASH_FLAG_BSY: FLASH Busy flag           
*                    - FLASH_FLAG_PGERR: FLASH Program error flag       
*                    - FLASH_FLAG_WRPRTERR: FLASH Write protected error flag      
*                    - FLASH_FLAG_EOP: FLASH End of Operation flag           
* Output         : None
* Return         : None
*******************************************************************************/
void FLASH_ClearFlag(u16 FLASH_FLAG)
{
  /* Check the parameters */
  assert(IS_FLASH_CLEAR_FLAG(FLASH_FLAG)) ;
  
  /* Clear the flags */
  FLASH->SR = FLASH_FLAG;
}

/*******************************************************************************
* Function Name  : FLASH_GetStatus
* Description    : Returns the FLASH Status.
* Input          : None
* Output         : None
* Return         : FLASH Status: The returned value can be: FLASH_BUSY, 
*                  FLASH_ERROR_PG or 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)
    { 
      flashstatus = FLASH_ERROR_PG;
    }
    else 
    {
      if(FLASH->SR & FLASH_FLAG_WRPRTERR)
      {
        flashstatus = FLASH_ERROR_WRP;
      }
      else
      {
        flashstatus = FLASH_COMPLETE;
      }
    }
  }
  /* Return the Flash Status */
  return flashstatus;
}

/*******************************************************************************
* Function Name  : FLASH_WaitForLastOperation
* Description    : Waits for a Flash operation to complete or a TIMEOUT to occur.
* Input          : - Timeout: FLASH progamming Timeout
* Output         : None
* Return         : FLASH Status: The returned value can be: FLASH_BUSY, 
*                  FLASH_ERROR_PG or FLASH_ERROR_WRP or FLASH_COMPLETE or 
*                  FLASH_TIMEOUT.
*******************************************************************************/
FLASH_Status FLASH_WaitForLastOperation(u32 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;
}

/*******************************************************************************
* Function Name  : delay
* Description    : Inserts a time delay.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
static void delay(void)
{
  vu32 i = 0;

  for(i = 0xFF; i != 0; i--)
  {
  }
}
#endif

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/