/**
  ******************************************************************************
  * @file    stm32f7xx_hal_flash.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    12-May-2015
  * @brief   FLASH HAL module driver.
  *          This file provides firmware functions to manage the following 
  *          functionalities of the internal FLASH memory:
  *           + Program operations functions
  *           + Memory Control functions 
  *           + Peripheral Errors functions
  *         
  @verbatim
  ==============================================================================
                        ##### FLASH peripheral features #####
  ==============================================================================
           
  [..] The Flash memory interface manages CPU AHB I-Code and D-Code accesses 
       to the Flash memory. It implements the erase and program Flash memory operations 
       and the read and write protection mechanisms.
      
  [..] The Flash memory interface accelerates code execution with a system of instruction
       prefetch and cache lines. 

  [..] The FLASH main features are:
      (+) Flash memory read operations
      (+) Flash memory program/erase operations
      (+) Read / write protections
      (+) Prefetch on I-Code
      (+) 64 cache lines of 128 bits on I-Code
      (+) 8 cache lines of 128 bits on D-Code
      
                     ##### How to use this driver #####
  ==============================================================================
    [..]                             
      This driver provides functions and macros to configure and program the FLASH 
      memory of all STM32F7xx devices.
    
      (#) FLASH Memory IO Programming functions: 
           (++) Lock and Unlock the FLASH interface using HAL_FLASH_Unlock() and 
                HAL_FLASH_Lock() functions
           (++) Program functions: byte, half word, word and double word
           (++) There Two modes of programming :
            (+++) Polling mode using HAL_FLASH_Program() function
            (+++) Interrupt mode using HAL_FLASH_Program_IT() function
    
      (#) Interrupts and flags management functions : 
           (++) Handle FLASH interrupts by calling HAL_FLASH_IRQHandler()
           (++) Wait for last FLASH operation according to its status
           (++) Get error flag status by calling HAL_SetErrorCode()          
    [..] 
      In addition to these functions, this driver includes a set of macros allowing
      to handle the following operations:
       (+) Set the latency
       (+) Enable/Disable the prefetch buffer
       (+) Enable/Disable the Instruction cache and the Data cache
       (+) Reset the Instruction cache and the Data cache
       (+) Enable/Disable the FLASH interrupts
       (+) Monitor the FLASH flags status
    [..]	   
	(@) For any Flash memory program operation (erase or program), the CPU clock frequency
        (HCLK) must be at least 1MHz. 
	(@) The contents of the Flash memory are not guaranteed if a device reset occurs during 
	    a Flash memory operation.
    (@) Any attempt to read the Flash memory while it is being written or erased, causes the 
	    bus to stall. Read operations are processed correctly once the program operation has 
		completed. This means that code or data fetches cannot be performed while a write/erase 
		operation is ongoing.
          
  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f7xx_hal.h"

/** @addtogroup STM32F7xx_HAL_Driver
  * @{
  */

/** @defgroup FLASH FLASH
  * @brief FLASH HAL module driver
  * @{
  */

#ifdef HAL_FLASH_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @addtogroup FLASH_Private_Constants
  * @{
  */
#define SECTOR_MASK               ((uint32_t)0xFFFFFF07)
#define FLASH_TIMEOUT_VALUE       ((uint32_t)50000)/* 50 s */
/**
  * @}
  */         
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/** @addtogroup FLASH_Private_Variables
  * @{
  */
/* Variable used for Erase sectors under interruption */
FLASH_ProcessTypeDef pFlash;
/**
  * @}
  */

/* Private function prototypes -----------------------------------------------*/
/** @addtogroup FLASH_Private_Functions
  * @{
  */
/* Program operations */
static void   FLASH_Program_DoubleWord(uint32_t Address, uint64_t Data);
static void   FLASH_Program_Word(uint32_t Address, uint32_t Data);
static void   FLASH_Program_HalfWord(uint32_t Address, uint16_t Data);
static void   FLASH_Program_Byte(uint32_t Address, uint8_t Data);
static void   FLASH_SetErrorCode(void);

HAL_StatusTypeDef FLASH_WaitForLastOperation(uint32_t Timeout);
/**
  * @}
  */

/* Exported functions --------------------------------------------------------*/
/** @defgroup FLASH_Exported_Functions FLASH Exported Functions
  * @{
  */
  
/** @defgroup FLASH_Exported_Functions_Group1 Programming operation functions 
 *  @brief   Programming operation functions 
 *
@verbatim   
 ===============================================================================
                  ##### Programming operation functions #####
 ===============================================================================  
    [..]
    This subsection provides a set of functions allowing to manage the FLASH 
    program operations.

@endverbatim
  * @{
  */

/**
  * @brief  Program byte, halfword, word or double word at a specified address
  * @param  TypeProgram:  Indicate the way to program at a specified address.
  *                           This parameter can be a value of @ref FLASH_Type_Program
  * @param  Address:  specifies the address to be programmed.
  * @param  Data: specifies the data to be programmed
  * 
  * @retval HAL_StatusTypeDef HAL Status
  */
HAL_StatusTypeDef HAL_FLASH_Program(uint32_t TypeProgram, uint32_t Address, uint64_t Data)
{
  HAL_StatusTypeDef status = HAL_ERROR;
  
  /* Process Locked */
  __HAL_LOCK(&pFlash);

  /* Check the parameters */
  assert_param(IS_FLASH_TYPEPROGRAM(TypeProgram));

  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
  
  if(status == HAL_OK)
  {
    switch(TypeProgram)
    {
      case FLASH_TYPEPROGRAM_BYTE :
      {
        /*Program byte (8-bit) at a specified address.*/
        FLASH_Program_Byte(Address, (uint8_t) Data);
        break;
      }
      
      case FLASH_TYPEPROGRAM_HALFWORD :
      {
        /*Program halfword (16-bit) at a specified address.*/
        FLASH_Program_HalfWord(Address, (uint16_t) Data);
        break;
      }
      
      case FLASH_TYPEPROGRAM_WORD :
      {
        /*Program word (32-bit) at a specified address.*/
        FLASH_Program_Word(Address, (uint32_t) Data);
        break;
      }
      
      case FLASH_TYPEPROGRAM_DOUBLEWORD :
      {
        /*Program double word (64-bit) at a specified address.*/
        FLASH_Program_DoubleWord(Address, Data);
        break;
      }
      default :
        break;
    }
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
    
    /* If the program operation is completed, disable the PG Bit */
    FLASH->CR &= (~FLASH_CR_PG);
  }

  /* Process Unlocked */
  __HAL_UNLOCK(&pFlash);

  return status;
}

/**
  * @brief   Program byte, halfword, word or double word at a specified address  with interrupt enabled.
  * @param  TypeProgram:  Indicate the way to program at a specified address.
  *                           This parameter can be a value of @ref FLASH_Type_Program
  * @param  Address:  specifies the address to be programmed.
  * @param  Data: specifies the data to be programmed
  * 
  * @retval HAL Status
  */
HAL_StatusTypeDef HAL_FLASH_Program_IT(uint32_t TypeProgram, uint32_t Address, uint64_t Data)
{
  HAL_StatusTypeDef status = HAL_OK;
  
  /* Process Locked */
  __HAL_LOCK(&pFlash);

  /* Check the parameters */
  assert_param(IS_FLASH_TYPEPROGRAM(TypeProgram));

  /* Enable End of FLASH Operation interrupt */
  __HAL_FLASH_ENABLE_IT(FLASH_IT_EOP);
  
  /* Enable Error source interrupt */
  __HAL_FLASH_ENABLE_IT(FLASH_IT_ERR);
  
  /* Clear pending flags (if any) */  
  __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP    | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |\
                         FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR| FLASH_FLAG_ERSERR);  

  pFlash.ProcedureOnGoing = FLASH_PROC_PROGRAM;
  pFlash.Address = Address;
  
  switch(TypeProgram)
  {
    case FLASH_TYPEPROGRAM_BYTE :
    {
      /*Program byte (8-bit) at a specified address.*/
      FLASH_Program_Byte(Address, (uint8_t) Data);
      break;
    }
    
    case FLASH_TYPEPROGRAM_HALFWORD :
    {
      /*Program halfword (16-bit) at a specified address.*/
      FLASH_Program_HalfWord(Address, (uint16_t) Data);
      break;
    }
    
    case FLASH_TYPEPROGRAM_WORD :
    {
      /*Program word (32-bit) at a specified address.*/
      FLASH_Program_Word(Address, (uint32_t) Data);
      break;
    }
    
    case FLASH_TYPEPROGRAM_DOUBLEWORD :
    {
      /*Program double word (64-bit) at a specified address.*/
      FLASH_Program_DoubleWord(Address, Data);
      break;
    }
    default :
      break;
  }
  return status;
}

/**
  * @brief This function handles FLASH interrupt request.
  * @retval None
  */
void HAL_FLASH_IRQHandler(void)
{
  uint32_t temp = 0;
  
  /* If the program operation is completed, disable the PG Bit */
  FLASH->CR &= (~FLASH_CR_PG);

  /* If the erase operation is completed, disable the SER Bit */
  FLASH->CR &= (~FLASH_CR_SER);
  FLASH->CR &= SECTOR_MASK; 

  /* if the erase operation is completed, disable the MER Bit */
  FLASH->CR &= (~FLASH_MER_BIT);

  /* Check FLASH End of Operation flag  */
  if(__HAL_FLASH_GET_FLAG(FLASH_FLAG_EOP) != RESET)
  {
    switch (pFlash.ProcedureOnGoing)
    {
      case FLASH_PROC_SECTERASE :
      {
        /* Nb of sector to erased can be decreased */
        pFlash.NbSectorsToErase--;

        /* Check if there are still sectors to erase */
        if(pFlash.NbSectorsToErase != 0)
        {
          temp = pFlash.Sector;
          /* Indicate user which sector has been erased */
          HAL_FLASH_EndOfOperationCallback(temp);

          /* Clear pending flags (if any) */  
          __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP);  

          /* Increment sector number */
          temp = ++pFlash.Sector;
          FLASH_Erase_Sector(temp, pFlash.VoltageForErase);
        }
        else
        {
          /* No more sectors to Erase, user callback can be called.*/
          /* Reset Sector and stop Erase sectors procedure */
          pFlash.Sector = temp = 0xFFFFFFFF;
          /* FLASH EOP interrupt user callback */
          HAL_FLASH_EndOfOperationCallback(temp);
          /* Sector Erase procedure is completed */
          pFlash.ProcedureOnGoing = FLASH_PROC_NONE;
          /* Clear FLASH End of Operation pending bit */
          __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP);
        }
        break;
      }
    
      case FLASH_PROC_MASSERASE :
      {
        /* MassErase ended. Return the selected bank : in this product we don't have Banks */
        /* FLASH EOP interrupt user callback */
        HAL_FLASH_EndOfOperationCallback(0);
        /* MAss Erase procedure is completed */
        pFlash.ProcedureOnGoing = FLASH_PROC_NONE;
        /* Clear FLASH End of Operation pending bit */
        __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP);
        break;
      }

      case FLASH_PROC_PROGRAM :
      {
        /*Program ended. Return the selected address*/
        /* FLASH EOP interrupt user callback */
        HAL_FLASH_EndOfOperationCallback(pFlash.Address);
        /* Programming procedure is completed */
        pFlash.ProcedureOnGoing = FLASH_PROC_NONE;
        /* Clear FLASH End of Operation pending bit */
        __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP);
        break;
      }
      default :
        break;
    }
  }
  
  /* Check FLASH operation error flags */
  if(__HAL_FLASH_GET_FLAG((FLASH_FLAG_OPERR  | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_ERSERR )) != RESET)
  {
    switch (pFlash.ProcedureOnGoing)
    {
      case FLASH_PROC_SECTERASE :
      {
        /* return the faulty sector */
        temp = pFlash.Sector;
        pFlash.Sector = 0xFFFFFFFF;
        break;
      }
      case FLASH_PROC_MASSERASE :
      {
        /* No return in case of Mass Erase */
        temp = 0;
        break;
      }
      case FLASH_PROC_PROGRAM :
      {
        /*return the faulty address*/
        temp = pFlash.Address;
        break;
      }
			default :
				break;
    }
    /*Save the Error code*/
    FLASH_SetErrorCode();

    /* FLASH error interrupt user callback */
    HAL_FLASH_OperationErrorCallback(temp);
    /* Clear FLASH error pending bits */
    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPERR  | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_ERSERR );

    /*Stop the procedure ongoing */
    pFlash.ProcedureOnGoing = FLASH_PROC_NONE;
  }
  
  if(pFlash.ProcedureOnGoing == FLASH_PROC_NONE)
  {
    /* Disable End of FLASH Operation interrupt */
    __HAL_FLASH_DISABLE_IT(FLASH_IT_EOP);

    /* Disable Error source interrupt */
    __HAL_FLASH_DISABLE_IT(FLASH_IT_ERR);

    /* Process Unlocked */
    __HAL_UNLOCK(&pFlash);
  }
  
}

/**
  * @brief  FLASH end of operation interrupt callback
  * @param  ReturnValue: The value saved in this parameter depends on the ongoing procedure
  *                 - Sectors Erase: Sector which has been erased (if 0xFFFFFFFF, it means that 
  *                                  all the selected sectors have been erased)
  *                 - Program      : Address which was selected for data program
  *                 - Mass Erase   : No return value expected
  * @retval None
  */
__weak void HAL_FLASH_EndOfOperationCallback(uint32_t ReturnValue)
{
  /* NOTE : This function Should not be modified, when the callback is needed,
            the HAL_FLASH_EndOfOperationCallback could be implemented in the user file
   */ 
}

/**
  * @brief  FLASH operation error interrupt callback
  * @param  ReturnValue: The value saved in this parameter depends on the ongoing procedure
  *                 - Sectors Erase: Sector which has been erased (if 0xFFFFFFFF, it means that 
  *                                  all the selected sectors have been erased)
  *                 - Program      : Address which was selected for data program
  *                 - Mass Erase   : No return value expected
  * @retval None
  */
__weak void HAL_FLASH_OperationErrorCallback(uint32_t ReturnValue)
{
  /* NOTE : This function Should not be modified, when the callback is needed,
            the HAL_FLASH_OperationErrorCallback could be implemented in the user file
   */ 
}

/**
  * @}
  */

/** @defgroup FLASH_Exported_Functions_Group2 Peripheral Control functions 
 *  @brief   management functions 
 *
@verbatim   
 ===============================================================================
                      ##### Peripheral Control functions #####
 ===============================================================================  
    [..]
    This subsection provides a set of functions allowing to control the FLASH 
    memory operations.

@endverbatim
  * @{
  */

/**
  * @brief  Unlock the FLASH control register access
  * @retval HAL Status
  */
HAL_StatusTypeDef HAL_FLASH_Unlock(void)
{
  if((FLASH->CR & FLASH_CR_LOCK) != RESET)
  {
    /* Authorize the FLASH Registers access */
    FLASH->KEYR = FLASH_KEY1;
    FLASH->KEYR = FLASH_KEY2;
  }
  else
  {
    return HAL_ERROR;
  }
  
  return HAL_OK; 
}

/**
  * @brief  Locks the FLASH control register access
  * @retval HAL Status
  */
HAL_StatusTypeDef HAL_FLASH_Lock(void)
{
  /* Set the LOCK Bit to lock the FLASH Registers access */
  FLASH->CR |= FLASH_CR_LOCK;
  
  return HAL_OK;  
}

/**
  * @brief  Unlock the FLASH Option Control Registers access.
  * @retval HAL Status
  */
HAL_StatusTypeDef HAL_FLASH_OB_Unlock(void)
{
  if((FLASH->OPTCR & FLASH_OPTCR_OPTLOCK) != RESET)
  {
    /* Authorizes the Option Byte register programming */
    FLASH->OPTKEYR = FLASH_OPT_KEY1;
    FLASH->OPTKEYR = FLASH_OPT_KEY2;
  }
  else
  {
    return HAL_ERROR;
  }  
  
  return HAL_OK;  
}

/**
  * @brief  Lock the FLASH Option Control Registers access.
  * @retval HAL Status 
  */
HAL_StatusTypeDef HAL_FLASH_OB_Lock(void)
{
  /* Set the OPTLOCK Bit to lock the FLASH Option Byte Registers access */
  FLASH->OPTCR |= FLASH_OPTCR_OPTLOCK;
  
  return HAL_OK;  
}

/**
  * @brief  Launch the option byte loading.
  * @retval HAL Status
  */
HAL_StatusTypeDef HAL_FLASH_OB_Launch(void)
{
  /* Set the OPTSTRT bit in OPTCR register */
  FLASH->OPTCR |= FLASH_OPTCR_OPTSTRT;

  /* Wait for last operation to be completed */
  return(FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE)); 
}

/**
  * @}
  */

/** @defgroup FLASH_Exported_Functions_Group3 Peripheral State and Errors functions 
 *  @brief   Peripheral Errors functions 
 *
@verbatim   
 ===============================================================================
                ##### Peripheral Errors functions #####
 ===============================================================================  
    [..]
    This subsection permits to get in run-time Errors of the FLASH peripheral.

@endverbatim
  * @{
  */

/**
  * @brief  Get the specific FLASH error flag.
  * @retval FLASH_ErrorCode: The returned value can be:
  *            @arg FLASH_ERROR_ERS: FLASH Erasing Sequence error flag 
  *            @arg FLASH_ERROR_PGP: FLASH Programming Parallelism error flag  
  *            @arg FLASH_ERROR_PGA: FLASH Programming Alignment error flag
  *            @arg FLASH_ERROR_WRP: FLASH Write protected error flag
  *            @arg FLASH_ERROR_OPERATION: FLASH operation Error flag 
  */
uint32_t HAL_FLASH_GetError(void)
{ 
   return pFlash.ErrorCode;
}  
  
/**
  * @}
  */    

/**
  * @brief  Wait for a FLASH operation to complete.
  * @param  Timeout: maximum flash operationtimeout
  * @retval HAL Status
  */
HAL_StatusTypeDef FLASH_WaitForLastOperation(uint32_t Timeout)
{ 
  uint32_t tickstart = 0;
  
  /* Clear Error Code */
  pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
  
  /* Wait for the FLASH operation to complete by polling on BUSY flag to be reset.
     Even if the FLASH operation fails, the BUSY flag will be reset and an error
     flag will be set */
  /* Get tick */
  tickstart = HAL_GetTick();

  while(__HAL_FLASH_GET_FLAG(FLASH_FLAG_BSY) != RESET) 
  { 
    if(Timeout != HAL_MAX_DELAY)
    {
      if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
      {
        return HAL_TIMEOUT;
      }
    } 
  }
  
  if(__HAL_FLASH_GET_FLAG((FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | \
                           FLASH_FLAG_PGPERR | FLASH_FLAG_ERSERR )) != RESET)
  {
    /*Save the error code*/
    FLASH_SetErrorCode();
    return HAL_ERROR;
  }

  /* If there is an error flag set */
  return HAL_OK;
  
}  

/**
  * @brief  Program a double word (64-bit) at a specified address.
  * @note   This function must be used when the device voltage range is from
  *         2.7V to 3.6V and an External Vpp is present.
  *
  * @note   If an erase and a program operations are requested simultaneously,    
  *         the erase operation is performed before the program one.
  *  
  * @param  Address: specifies the address to be programmed.
  * @param  Data: specifies the data to be programmed.
  * @retval None
  */
static void FLASH_Program_DoubleWord(uint32_t Address, uint64_t Data)
{
  /* Check the parameters */
  assert_param(IS_FLASH_ADDRESS(Address));
  
  /* If the previous operation is completed, proceed to program the new data */
  FLASH->CR &= CR_PSIZE_MASK;
  FLASH->CR |= FLASH_PSIZE_DOUBLE_WORD;
  FLASH->CR |= FLASH_CR_PG;
  
  *(__IO uint64_t*)Address = Data;
  
  /* Data synchronous Barrier (DSB) Just after the write operation
     This will force the CPU to respect the sequence of instruction (no optimization).*/
  __DSB();
}


/**
  * @brief  Program word (32-bit) at a specified address.
  * @note   This function must be used when the device voltage range is from
  *         2.7V to 3.6V.
  *
  * @note   If an erase and a program operations are requested simultaneously,    
  *         the erase operation is performed before the program one.
  *  
  * @param  Address: specifies the address to be programmed.
  * @param  Data: specifies the data to be programmed.
  * @retval None
  */
static void FLASH_Program_Word(uint32_t Address, uint32_t Data)
{
  /* Check the parameters */
  assert_param(IS_FLASH_ADDRESS(Address));
  
  /* If the previous operation is completed, proceed to program the new data */
  FLASH->CR &= CR_PSIZE_MASK;
  FLASH->CR |= FLASH_PSIZE_WORD;
  FLASH->CR |= FLASH_CR_PG;

  *(__IO uint32_t*)Address = Data;
  
  /* Data synchronous Barrier (DSB) Just after the write operation
     This will force the CPU to respect the sequence of instruction (no optimization).*/
  __DSB();
}

/**
  * @brief  Program a half-word (16-bit) at a specified address.
  * @note   This function must be used when the device voltage range is from
  *         2.7V to 3.6V.
  *
  * @note   If an erase and a program operations are requested simultaneously,    
  *         the erase operation is performed before the program one.
  *  
  * @param  Address: specifies the address to be programmed.
  * @param  Data: specifies the data to be programmed.
  * @retval None
  */
static void FLASH_Program_HalfWord(uint32_t Address, uint16_t Data)
{
  /* Check the parameters */
  assert_param(IS_FLASH_ADDRESS(Address));
  
  /* If the previous operation is completed, proceed to program the new data */
  FLASH->CR &= CR_PSIZE_MASK;
  FLASH->CR |= FLASH_PSIZE_HALF_WORD;
  FLASH->CR |= FLASH_CR_PG;

  *(__IO uint16_t*)Address = Data;

  /* Data synchronous Barrier (DSB) Just after the write operation
     This will force the CPU to respect the sequence of instruction (no optimization).*/
  __DSB();
  
}

/**
  * @brief  Program byte (8-bit) at a specified address.
  * @note   This function must be used when the device voltage range is from
  *         2.7V to 3.6V.
  *
  * @note   If an erase and a program operations are requested simultaneously,    
  *         the erase operation is performed before the program one.
  *  
  * @param  Address: specifies the address to be programmed.
  * @param  Data: specifies the data to be programmed.
  * @retval None
  */
static void FLASH_Program_Byte(uint32_t Address, uint8_t Data)
{
  /* Check the parameters */
  assert_param(IS_FLASH_ADDRESS(Address));
  
  /* If the previous operation is completed, proceed to program the new data */
  FLASH->CR &= CR_PSIZE_MASK;
  FLASH->CR |= FLASH_PSIZE_BYTE;
  FLASH->CR |= FLASH_CR_PG;

  *(__IO uint8_t*)Address = Data;

  /* Data synchronous Barrier (DSB) Just after the write operation
     This will force the CPU to respect the sequence of instruction (no optimization).*/
  __DSB();
}

/**
  * @brief  Set the specific FLASH error flag.
  * @retval None
  */
static void FLASH_SetErrorCode(void)
{ 
  if(__HAL_FLASH_GET_FLAG(FLASH_FLAG_WRPERR) != RESET)
  {
   pFlash.ErrorCode |= HAL_FLASH_ERROR_WRP;
  }
  
  if(__HAL_FLASH_GET_FLAG(FLASH_FLAG_PGAERR) != RESET)
  {
   pFlash.ErrorCode |= HAL_FLASH_ERROR_PGA;
  }
  
  if(__HAL_FLASH_GET_FLAG(FLASH_FLAG_PGPERR) != RESET)
  {
    pFlash.ErrorCode |= HAL_FLASH_ERROR_PGP;
  }
  
  if(__HAL_FLASH_GET_FLAG(FLASH_FLAG_ERSERR) != RESET)
  {
    pFlash.ErrorCode |= HAL_FLASH_ERROR_ERS;
  }
  
  if(__HAL_FLASH_GET_FLAG(FLASH_FLAG_OPERR) != RESET)
  {
    pFlash.ErrorCode |= HAL_FLASH_ERROR_OPERATION;
  }
}

/**
  * @}
  */

#endif /* HAL_FLASH_MODULE_ENABLED */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/