/**
******************************************************************************
* @file    EEPROM/EEPROM_Emulation/src/eeprom.c 
* @author  MCD Application Team
* @brief   This file provides all the EEPROM emulation firmware functions.
******************************************************************************
* @attention
*
* <h2><center>&copy; Copyright (c) 2017 STMicroelectronics International N.V. 
* All rights reserved.</center></h2>
*
* Redistribution and use in source and binary forms, with or without 
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution 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 other 
*    contributors to this software may be used to endorse or promote products 
*    derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this 
*    software, must execute solely and exclusively on microcontroller or
*    microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under 
*    this license is void and will automatically terminate your rights under 
*    this license. 
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS" 
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT 
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT 
* SHALL STMICROELECTRONICS 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.
*
******************************************************************************
*/
/** @addtogroup EEPROM_Emulation
 * @{
 */ 

/* Includes ------------------------------------------------------------------*/
#include "board_config.h"
#include "cammsys_flash.h"
#include "eeprom.h"
#include "eeprom_address.h"


/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/

/* Global variable used to store variable value in read sequence */
uint16_t DataVar = 0;

/* Virtual address defined by the user: 0xFFFF value is prohibited */


/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
static uint32_t EE_Format(void);
static uint32_t EE_FindValidPage(uint8_t Operation);
static uint32_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data);
static uint32_t EE_PageTransfer(uint16_t VirtAddress, uint16_t Data);
static uint32_t EE_Transfer_Write_Variable(uint32_t writeaddress, uint16_t VirtAddress, uint16_t Data);
static uint32_t EE_VerifyPageFullyErased(uint32_t Address);
static uint32_t EE_WriteData(uint32_t address, uint32_t data);

uint32_t EE_EraseAll()
{
    if (flash_erase_page(PAGE0_BASE_ADDRESS) != E_NO_ERROR)
        return EE_ERROR;
    
    if (flash_erase_page(PAGE1_BASE_ADDRESS) != E_NO_ERROR)
        return EE_ERROR;

    return EE_OK;
}

/**
 * @brief  Restore the pages to a known good state in case of page's status
 *   corruption after a power loss.
 * @param  None.
 * @retval - Flash error code: on write Flash error
 *         - FLASH_COMPLETE: on success
 */
uint32_t EE_Init(void)
{
    uint32_t PageStatus0 = 6, PageStatus1 = 6;
    uint16_t VarIdx = 0;
    uint32_t EepromStatus = 0, ReadStatus = 0;
    int16_t x = -1;
    uint32_t FlashStatus;
    uint32_t SectorError = 0;

    Flash_Initialization();

    /* Get Page0 status */
    PageStatus0 = (*(__IO uint32_t*)PAGE0_BASE_ADDRESS);
    /* Get Page1 status */
    PageStatus1 = (*(__IO uint32_t*)PAGE1_BASE_ADDRESS);

    /* Check for invalid header states and repair if necessary */
    switch (PageStatus0)
    {
    case ERASED:
        if (PageStatus1 == VALID_PAGE) /* Page0 erased, Page1 valid */
        {
            /* Erase Page0 */
            if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
            {
                if (flash_erase_page(PAGE0_BASE_ADDRESS) != E_NO_ERROR)
                    return EE_ERROR;
            }
        }
        else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */
        {
            /* Erase Page0 */
            if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
            { 
                if (flash_erase_page(PAGE0_BASE_ADDRESS) != E_NO_ERROR)
                    return EE_ERROR;
            }
            /* Mark Page1 as valid */
            FlashStatus = EE_WriteData(PAGE1_BASE_ADDRESS, VALID_PAGE);
            if (FlashStatus != EE_OK)
                return FlashStatus;
        }
        else /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */
        {
            /* Erase both Page0 and Page1 and set Page0 as valid page */
            FlashStatus = EE_Format();
            if (FlashStatus != EE_OK)
                return FlashStatus;
        }
        break;

    case RECEIVE_DATA:
        if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */
        {
            /* Transfer data from Page1 to Page0 */
            EE_Item eeItem;
            for (VarIdx = 0; VarIdx < EE_INDEX_MAX; VarIdx++)
            {
                eeItem.buf = *(__IO uint32_t*)(PAGE0_BASE_ADDRESS+4);
                if (eeItem.index == VarIdx)
                {
                    x = VarIdx;
                }
                if (VarIdx != x)
                {
                    /* Read the last variables' updates */
                    ReadStatus = EE_ReadVariable(VarIdx, &DataVar);
                    /* In case variable corresponding to the virtual address was found */
                    if (ReadStatus != 0x1)
                    {
                        /* Transfer the variable to the Page0 */
                        EepromStatus = EE_VerifyPageFullWriteVariable(VarIdx, DataVar);
                        /* If program operation was failed, a Flash error code is returned */
                        if (EepromStatus != EE_OK)
                        {
                            return EepromStatus;
                        }
                    }
                }
            }
            /* Mark Page0 as valid */
            FlashStatus = EE_WriteData(PAGE0_BASE_ADDRESS, VALID_PAGE);
            /* If program operation was failed, a Flash error code is returned */
            if (FlashStatus != EE_OK)
                return FlashStatus;
            
            /* Erase Page1 */
            if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
            { 
                if (flash_erase_page(PAGE1_BASE_ADDRESS) != E_NO_ERROR)
                    return EE_ERROR;
            }
        }
        else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */
        {
            /* Erase Page1 */
            if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
            { 
                if (flash_erase_page(PAGE1_BASE_ADDRESS) != E_NO_ERROR)
                    return EE_ERROR;
            }
            /* Mark Page0 as valid */
            FlashStatus = EE_WriteData(PAGE0_BASE_ADDRESS, VALID_PAGE);
            /* If program operation was failed, a Flash error code is returned */
            if (FlashStatus != EE_OK)
                return FlashStatus;
        }
        else /* Invalid state -> format eeprom */
        {
            /* Erase both Page0 and Page1 and set Page0 as valid page */
            FlashStatus = EE_Format();
            /* If erase/program operation was failed, a Flash error code is returned */
            if (FlashStatus != EE_OK)
            {
                return FlashStatus;
            }
        }
        break;

    case VALID_PAGE:
        if (PageStatus1 == VALID_PAGE) /* Invalid state -> format eeprom */
        {
            /* Erase both Page0 and Page1 and set Page0 as valid page */
            FlashStatus = EE_Format();
            /* If erase/program operation was failed, a Flash error code is returned */
            if (FlashStatus != EE_OK)
            {
                return FlashStatus;
            }
        }
        else if (PageStatus1 == ERASED) /* Page0 valid, Page1 erased */
        {
            /* Erase Page1 */
            if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
            { 
                if (flash_erase_page(PAGE1_BASE_ADDRESS) != E_NO_ERROR)
                    return EE_ERROR;
            }
        }
        else /* Page0 valid, Page1 receive */
        {
            /* Transfer data from Page0 to Page1 */
            EE_Item eeItem;
            for (VarIdx = 0; VarIdx < EE_INDEX_MAX; VarIdx++)
            {
                eeItem.buf = *(__IO uint32_t*)(PAGE1_BASE_ADDRESS + 4);
                if (eeItem.index == VarIdx)
                {
                    x = VarIdx;
                }
                if (VarIdx != x)
                {
                    /* Read the last variables' updates */
                    ReadStatus = EE_ReadVariable(VarIdx, &DataVar);
                    /* In case variable corresponding to the virtual address was found */
                    if (ReadStatus != 0x1)
                    {
                        /* Transfer the variable to the Page1 */
                        EepromStatus = EE_VerifyPageFullWriteVariable(VarIdx, DataVar);
                        /* If program operation was failed, a Flash error code is returned */
                        if (EepromStatus != EE_OK)
                        {
                            return EepromStatus;
                        }
                    }
                }
            }
            /* Mark Page1 as valid */
            FlashStatus = EE_WriteData(PAGE1_BASE_ADDRESS, VALID_PAGE);        
            /* If program operation was failed, a Flash error code is returned */
            if (FlashStatus != EE_OK)
                return FlashStatus;
            
            /* Erase Page0 */
            if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
            { 
                if (flash_erase_page(PAGE0_BASE_ADDRESS) != E_NO_ERROR)
                    return EE_ERROR;
            }
        }
        break;

    default:  /* Any other state -> format eeprom */
        /* Erase both Page0 and Page1 and set Page0 as valid page */
        FlashStatus = EE_Format();
        /* If erase/program operation was failed, a Flash error code is returned */
        if (FlashStatus != EE_OK)
        {
            return FlashStatus;
        }
        break;
    }

    return EE_OK;
}

/**
 * @brief  Verify if specified page is fully erased.
 * @param  Address: page address
 *   This parameter can be one of the following values:
 *     @arg PAGE0_BASE_ADDRESS: Page0 base address
 *     @arg PAGE1_BASE_ADDRESS: Page1 base address
 * @retval page fully erased status:
 *           - 0: if Page not erased
 *           - 1: if Page erased
 */
uint32_t EE_VerifyPageFullyErased(uint32_t Address)
{
    uint32_t ReadStatus = 1;
    uint32_t AddressValue = 0x5555;
    uint32_t endAddress = 0;
    EE_Item eeItem;

    if (Address == PAGE0_BASE_ADDRESS)
        endAddress = PAGE0_END_ADDRESS;
    else if (Address == PAGE1_BASE_ADDRESS)
        endAddress = PAGE1_END_ADDRESS;
    
    /* Check each active page address starting from end */
    while (Address < endAddress)
    {
        /* Get the current location content to be compared with virtual address */
        AddressValue = (*(__IO uint32_t*)Address);

        /* Compare the read address with the virtual address */
        if (AddressValue != ERASED)
        {
            /* In case variable value is read, reset ReadStatus flag */
            ReadStatus = 0;

            break;
        }
        /* Next address location */
        Address = Address + 4;
    }
  
    /* Return ReadStatus value: (0: Page not erased, 1: Sector erased) */
    return ReadStatus;
}

/**
 * @brief  Returns the last stored variable data, if found, which correspond to
 *   the passed virtual address
 * @param  VirtAddress: Variable virtual address
 * @param  Data: Global variable contains the read variable value
 * @retval Success or error status:
 *           - 0: if variable was found
 *           - 1: if the variable was not found
 *           - NO_VALID_PAGE: if no valid page was found.
 */
uint32_t EE_ReadVariable(uint16_t VirtAddress, uint16_t* Data)
{
    uint32_t ValidPage = PAGE0;
    uint32_t AddressValue = 0x5555, ReadStatus = 1;
    uint32_t Address = EEPROM_START_ADDRESS, PageStartAddress = EEPROM_START_ADDRESS;
    EE_Item eeItem;

    /* Get active Page for read operation */
    ValidPage = EE_FindValidPage(READ_FROM_VALID_PAGE);

    /* Check if there is no valid page */
    if (ValidPage == NO_VALID_PAGE)
    {
        return  NO_VALID_PAGE;
    }

    /* Get the valid Page start Address */
    PageStartAddress = (uint32_t)(EEPROM_START_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE));

    /* Get the valid Page end Address */
    Address = (uint32_t)((EEPROM_START_ADDRESS - 4) + (uint32_t)((1 + ValidPage) * PAGE_SIZE));

    /* Check each active page address starting from end */
    while (Address >= (PageStartAddress + 4))
    {
        /* Get the current location content to be compared with virtual address */
        eeItem.buf = (*(__IO uint32_t*)Address);

        /* Compare the read address with the virtual address */
        if (eeItem.index == VirtAddress)
        {
            /* Get content of Address-2 which is variable value */
            *Data = eeItem.data;

            /* In case variable value is read, reset ReadStatus flag */
            ReadStatus = 0;

            break;
        }
        else
        {
            /* Next address location */
            Address = Address - 4;
        }
    }

    /* Return ReadStatus value: (0: variable exist, 1: variable doesn't exist) */
    return ReadStatus;
}


/**
 * @brief  Writes/upadtes variable data in EEPROM.
 * @param  VirtAddress: Variable virtual address
 * @param  Data: 16 bit data to be written
 * @retval Success or error status:
 *           - FLASH_COMPLETE: on success
 *           - PAGE_FULL: if valid page is full
 *           - NO_VALID_PAGE: if no valid page was found
 *           - Flash error code: on write Flash error
 */
uint32_t EE_WriteVariable(uint16_t VirtAddress, uint16_t Data)
{
    uint32_t Status = 0;

    /* Write the variable virtual address and value in the EEPROM */
    Status = EE_VerifyPageFullWriteVariable(VirtAddress, Data);

    /* In case the EEPROM active page is full */
    if (Status == PAGE_FULL)
    {
        /* Perform Page transfer */
        Status = EE_PageTransfer(VirtAddress, Data);
    }

    /* Return last operation status */
    return Status;
}

/**
 * @brief  Erases PAGE and PAGE1 and writes VALID_PAGE header to PAGE
 * @param  None
 * @retval Status of the last operation (Flash write or erase) done during
 *         EEPROM formating
 */
static uint32_t EE_Format(void)
{
    uint32_t FlashStatus = EE_OK;
    uint32_t SectorError = 0;

    /* Erase Page0 */
    if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
    {
        if (flash_erase_page(PAGE0_BASE_ADDRESS) != E_NO_ERROR)
            return EE_ERROR;
    }
    /* Set Page0 as valid page: Write VALID_PAGE at Page0 base address */
    FlashStatus = EE_WriteData(PAGE0_BASE_ADDRESS, VALID_PAGE);
    /* If program operation was failed, a Flash error code is returned */
    if (FlashStatus != EE_OK)
        return FlashStatus;

    /* Erase Page1 */
    if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
    {  
        if (flash_erase_page(PAGE1_BASE_ADDRESS) != E_NO_ERROR)
            return EE_ERROR;
    }
  
    return EE_OK;
}

/**
 * @brief  Find valid Page for write or read operation
 * @param  Operation: operation to achieve on the valid page.
 *   This parameter can be one of the following values:
 *     @arg READ_FROM_VALID_PAGE: read operation from valid page
 *     @arg WRITE_IN_VALID_PAGE: write operation from valid page
 * @retval Valid page number (PAGE or PAGE1) or NO_VALID_PAGE in case
 *   of no valid page was found
 */
static uint32_t EE_FindValidPage(uint8_t Operation)
{
    uint32_t PageStatus0 = 6, PageStatus1 = 6;

    /* Get Page0 actual status */
    PageStatus0 = (*(__IO uint32_t*)PAGE0_BASE_ADDRESS);

    /* Get Page1 actual status */
    PageStatus1 = (*(__IO uint32_t*)PAGE1_BASE_ADDRESS);

    /* Write or read operation */
    switch (Operation)
    {
    case WRITE_IN_VALID_PAGE:   /* ---- Write operation ---- */
        if (PageStatus1 == VALID_PAGE)
        {
            /* Page0 receiving data */
            if (PageStatus0 == RECEIVE_DATA)
            {
                return PAGE0;         /* Page0 valid */
            }
            else
            {
                return PAGE1;         /* Page1 valid */
            }
        }
        else if (PageStatus0 == VALID_PAGE)
        {
            /* Page1 receiving data */
            if (PageStatus1 == RECEIVE_DATA)
            {
                return PAGE1;         /* Page1 valid */
            }
            else
            {
                return PAGE0;         /* Page0 valid */
            }
        }
        else
        {
            return NO_VALID_PAGE;   /* No valid Page */
        }

    case READ_FROM_VALID_PAGE:  /* ---- Read operation ---- */
        if (PageStatus0 == VALID_PAGE)
        {
            return PAGE0;           /* Page0 valid */
        }
        else if (PageStatus1 == VALID_PAGE)
        {
            return PAGE1;           /* Page1 valid */
        }
        else
        {
            return NO_VALID_PAGE ;  /* No valid Page */
        }

    default:
        return PAGE0;             /* Page0 valid */
    }
}

/**
 * @brief  Verify if active page is full and Writes variable in EEPROM.
 * @param  VirtAddress: 16 bit virtual address of the variable
 * @param  Data: 16 bit data to be written as variable value
 * @retval Success or error status:
 *           - FLASH_COMPLETE: on success
 *           - PAGE_FULL: if valid page is full
 *           - NO_VALID_PAGE: if no valid page was found
 *           - Flash error code: on write Flash error
 */

static uint32_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data)
{
    uint32_t FlashStatus = EE_OK;
    uint32_t ValidPage = PAGE0;
    uint32_t Address = EEPROM_START_ADDRESS, PageEndAddress = EEPROM_START_ADDRESS+PAGE_SIZE;

    /* Get valid Page for write operation */
    ValidPage = EE_FindValidPage(WRITE_IN_VALID_PAGE);
  
    /* Check if there is no valid page */
    if (ValidPage == NO_VALID_PAGE)
    {
        return  NO_VALID_PAGE;
    }

    /* Get the valid Page start Address */
    Address = (uint32_t)(EEPROM_START_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE) + 4);

    /* Get the valid Page end Address */
    PageEndAddress = (uint32_t)((EEPROM_START_ADDRESS - 4) + (uint32_t)((ValidPage + 1) * PAGE_SIZE));

    /* Check each active page address starting from begining */
    while (Address <= PageEndAddress)
    {
        /* Verify if Address and Address+2 contents are 0xFFFFFFFF */
        if ((*(__IO uint32_t*)Address) == ERASED)
        {
            EE_Item eeItem;
            eeItem.index = VirtAddress;
            eeItem.data = Data;
            
            /* Set variable data */
            FlashStatus = EE_WriteData(Address, eeItem.buf);
            
            return FlashStatus;
        }
        else
        {
            /* Next address location */
            Address = Address + 4;
        }
    }

    /* Return PAGE_FULL in case the valid page is full */    
    return PAGE_FULL;
}

static uint32_t EE_Transfer_Write_Variable(uint32_t writeaddress, uint16_t VirtAddress, uint16_t Data)
{
    uint32_t FlashStatus = EE_OK;
    uint32_t ValidPage = PAGE0;
    uint32_t Address = writeaddress, PageEndAddress = writeaddress+PAGE_SIZE;

    /* Check each active page address starting from begining */
    while (Address <= PageEndAddress)
    {
        /* Verify if Address and Address+2 contents are 0xFFFFFFFF */
        if ((*(__IO uint32_t*)Address) == ERASED)
        {
            EE_Item eeItem;
            eeItem.index = VirtAddress;
            eeItem.data = Data;
            
            /* Set variable data */
            FlashStatus = EE_WriteData(Address, eeItem.buf);
            
            return FlashStatus;
        }
        else
        {
            /* Next address location */
            Address = Address + 4;
        }
    }

    /* Return PAGE_FULL in case the valid page is full */    
    return PAGE_FULL;
}


/**
 * @brief  Returns the last stored variable data, if found, which correspond to
 *   the passed virtual address
 * @param  VirtAddress: Variable virtual address
 * @param  Data: Global variable contains the read variable value
 * @retval Success or error status:
 *           - 0: if variable was found
 *           - 1: if the variable was not found
 *           - NO_VALID_PAGE: if no valid page was found.
 */
static uint32_t EE_Transfer_ReadVariable(uint32_t OldAddress, uint16_t VirtAddress, uint16_t* Data)
{
    uint32_t ValidPage = PAGE0;
    uint32_t AddressValue = 0x5555, ReadStatus = 1;
    uint32_t Address = EEPROM_START_ADDRESS, PageStartAddress = EEPROM_START_ADDRESS;
    EE_Item eeItem;    

    /* Get the valid Page start Address */
    PageStartAddress = OldAddress;

    /* Get the valid Page end Address */
    Address = (uint32_t)((PageStartAddress - 4) + (uint32_t)PAGE_SIZE);

    /* Check each active page address starting from end */
    while (Address >= (PageStartAddress + 4))
    {
        /* Get the current location content to be compared with virtual address */
        eeItem.buf = (*(__IO uint32_t*)Address);

        /* Compare the read address with the virtual address */
        if (eeItem.index == VirtAddress)
        {
            /* Get content of Address-2 which is variable value */
            *Data = eeItem.data;

            /* In case variable value is read, reset ReadStatus flag */
            ReadStatus = 0;

            break;
        }
        else
        {
            /* Next address location */
            Address = Address - 4;
        }
    }

    /* Return ReadStatus value: (0: variable exist, 1: variable doesn't exist) */
    return ReadStatus;
}




/**
 * @brief  Transfers last updated variables data from the full Page to
 *   an empty one.
 * @param  VirtAddress: 16 bit virtual address of the variable
 * @param  Data: 16 bit data to be written as variable value
 * @retval Success or error status:
 *           - FLASH_COMPLETE: on success
 *           - PAGE_FULL: if valid page is full
 *           - NO_VALID_PAGE: if no valid page was found
 *           - Flash error code: on write Flash error
 */
static uint32_t EE_PageTransfer(uint16_t VirtAddress, uint16_t Data)
{
    uint32_t FlashStatus = EE_OK;
    uint32_t NewPageAddress = EEPROM_START_ADDRESS;
    uint32_t OldPageAddress = EEPROM_START_ADDRESS;    
    uint16_t OldPageId=0;
    uint16_t ValidPage = PAGE0, VarIdx = 0;
    uint32_t EepromStatus = 0, ReadStatus = 0;
    uint32_t SectorError = 0;

    /* Get active Page for read operation */
    ValidPage = EE_FindValidPage(READ_FROM_VALID_PAGE);

    if (ValidPage == PAGE1)       /* Page1 valid */
    {
        /* New page address where variable will be moved to */
        NewPageAddress = PAGE0_BASE_ADDRESS;

        /* Old page ID where variable will be taken from */
        OldPageId = PAGE1_ID;
        OldPageAddress = PAGE1_BASE_ADDRESS;
    }
    else if (ValidPage == PAGE0)  /* Page0 valid */
    {
        /* New page address  where variable will be moved to */
        NewPageAddress = PAGE1_BASE_ADDRESS;

        /* Old page ID where variable will be taken from */
        OldPageId = PAGE0_ID;
        OldPageAddress = PAGE0_BASE_ADDRESS;
    }
    else
    {
        return NO_VALID_PAGE;       /* No valid Page */
    }

    /* Set the new Page status to RECEIVE_DATA status */
    FlashStatus = EE_WriteData(NewPageAddress, VALID_PAGE);
    /* If program operation was failed, a Flash error code is returned */
    if (FlashStatus != EE_OK)
        return FlashStatus;
  
    /* Write the variable passed as parameter in the new active page */
    EepromStatus = EE_Transfer_Write_Variable(NewPageAddress, VirtAddress, Data);
    /* If program operation was failed, a Flash error code is returned */
    if (EepromStatus != EE_OK)
    {
        return EepromStatus;
    }

    /* Transfer process: transfer variables from old to the new active page */
    for (VarIdx = 0; VarIdx < EE_INDEX_MAX; VarIdx++)
    {
        if (VarIdx != VirtAddress)  /* Check each variable except the one passed as parameter */
        {
            /* Read the other last variable updates */
            ReadStatus = EE_Transfer_ReadVariable(OldPageAddress, VarIdx, &DataVar);
            /* In case variable corresponding to the virtual address was found */
            if (ReadStatus != 0x1)
            {
                /* Transfer the variable to the new active page */
                EepromStatus = EE_Transfer_Write_Variable(NewPageAddress, VarIdx, DataVar);
                /* If program operation was failed, a Flash error code is returned */
                if (EepromStatus != EE_OK)
                {
                    return EepromStatus;
                }
            }
        }
    }

    /* Erase the old Page: Set old Page status to ERASED status */
    if (flash_erase_page(OldPageAddress) != E_NO_ERROR)
        return EE_ERROR;  
    
    /* Return last operation flash status */
    return FlashStatus;

#if 0 

    /* Set the new Page status to RECEIVE_DATA status */
    FlashStatus = EE_WriteData(NewPageAddress, RECEIVE_DATA);
    /* If program operation was failed, a Flash error code is returned */
    if (FlashStatus != EE_OK)
        return FlashStatus;
  
    /* Write the variable passed as parameter in the new active page */
    EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddress, Data);
    /* If program operation was failed, a Flash error code is returned */
    if (EepromStatus != EE_OK)
    {
        return EepromStatus;
    }

    /* Transfer process: transfer variables from old to the new active page */
    for (VarIdx = 0; VarIdx < NB_OF_VAR; VarIdx++)
    {
        if (VirtAddVarTab[VarIdx] != VirtAddress)  /* Check each variable except the one passed as parameter */
        {
            /* Read the other last variable updates */
            ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
            /* In case variable corresponding to the virtual address was found */
            if (ReadStatus != 0x1)
            {
                /* Transfer the variable to the new active page */
                EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
                /* If program operation was failed, a Flash error code is returned */
                if (EepromStatus != EE_OK)
                {
                    return EepromStatus;
                }
            }
        }
    }

    /* Erase the old Page: Set old Page status to ERASED status */
    if (flash_erase_page(OldPageAddress) != E_NO_ERROR)
        return EE_ERROR;
  
    /* Set new Page status to VALID_PAGE status */
    FlashStatus = EE_WriteData(NewPageAddress, VALID_PAGE);
    /* If program operation was failed, a Flash error code is returned */
    if (FlashStatus != EE_OK)
        return FlashStatus;

    /* Return last operation flash status */
    return FlashStatus;
#endif    
}

/**
 * @}
 */


static uint32_t EE_WriteData(uint32_t address, uint32_t data)
{
    return (Flash_Write(address, (uint8_t *)&data, 4) ? EE_OK : EE_ERROR);
}



/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/