/**
* @brief Verify if active page is full and Writes variable in EEPROM.
* @param EepromAddress: 16 bit virtual address of the variable
* @param EepromData: 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 uint16_t EEPROM_VerifyPageFullWriteVariable(uint16_t EepromAddress, uint16_t EepromData)
{
FLASH_Status FlashStatus = FLASH_COMPLETE;
uint16_t ValidPage = PAGE0;
uint32_t Address = PAGE0_BASE_ADDRESS, PageEndAddress = PAGE1_END_ADDRESS;
/* Get valid Page for write operation */
ValidPage = EEPROM_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));
/* Get the valid Page end Address */
PageEndAddress = (uint32_t)((EEPROM_START_ADDRESS - 2) + (uint32_t)((1 + ValidPage) * 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) == 0xFFFFFFFF)
{
/* Set variable data */
FlashStatus = FLASH_ProgramHalfWord(Address, EepromData);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Set variable virtual address */
FlashStatus = FLASH_ProgramHalfWord(Address + 2, EepromAddress);
/* Return program operation status */
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 EepromAddress: Variable virtual address
* @param EepromData: 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 uint16_t EEPROM_ReadVariable(uint16_t EepromAddress, uint16_t *EepromData)
{
uint16_t ValidPage = PAGE0;
uint16_t AddressValue = 0, ReadStatus = 1;
uint32_t Address = PAGE0_BASE_ADDRESS, PageStartAddress = PAGE0_BASE_ADDRESS;
/* Get active Page for read operation */
ValidPage = EEPROM_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 - 2) + (uint32_t)((1 + ValidPage) * PAGE_SIZE));
/* Check each active page address starting from end */
while (Address > (PageStartAddress + 2))
{
/* Get the current location content to be compared with virtual address */
AddressValue = (*(__IO uint16_t*)Address);
/* Compare the read address with the virtual address */
if (AddressValue == EepromAddress)
{
/* Get content of Address-2 which is variable value */
*EepromData = (*(__IO uint16_t*)(Address - 2));
/* 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;
}
/*********************************************************************************
*Function : static uint16_t EEPROM_PageTransfer(uint16_t EepromAddress, uint16_t EepromData)
*Description : Transfers last updated variables data from the full Page to an empty one.
*Input : EepromAddress: 16 bit virtual address of the variable
EepromData: 16 bit data to be written as variable value
*Output : none
*Return : 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
*author : lz
*date : 2015-2-1
*Others : none
**********************************************************************************/
static uint16_t EEPROM_PageTransfer(uint16_t EepromAddress, uint16_t EepromData)
{
FLASH_Status FlashStatus = FLASH_COMPLETE;
uint32_t OldPageAddress = PAGE0_BASE_ADDRESS, NewPageAddress = PAGE1_BASE_ADDRESS;
uint16_t ValidPage = PAGE0, EepromAddressIdx = 0;
uint16_t EepromStatus = 0, ReadStatus = 0;
/* Get active Page for read operation */
ValidPage = EEPROM_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 address where variable will be taken from */
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 address where variable will be taken from */
OldPageAddress = PAGE0_BASE_ADDRESS;
}
else
{
return NO_VALID_PAGE; /* No valid Page */
}
/* Set the new Page status to RECEIVE_DATA status */
FlashStatus = FLASH_ProgramHalfWord(NewPageAddress, RECEIVE_DATA);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Write the variable passed as parameter in the new active page */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddress, EepromData);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
/* Transfer process: transfer variables from old to the new active page */
for (EepromAddressIdx = 0; EepromAddressIdx < EEPROM_SIZE; EepromAddressIdx++)
{
if (EepromAddressTab[EepromAddressIdx] != EepromAddress) /* Check each variable except the one passed as parameter */
{
/* Read the other last variable updates */
ReadStatus = EEPROM_ReadVariable(EepromAddressTab[EepromAddressIdx], &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the new active page */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddressTab[EepromAddressIdx], EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Erase the old Page: Set old Page status to ERASED status */
FlashStatus = FLASH_ErasePage(OldPageAddress);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Set new Page status to VALID_PAGE status */
FlashStatus = FLASH_ProgramHalfWord(NewPageAddress, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Return last operation flash status */
return FlashStatus;
}
