/**
* @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
*/
uint16_t EE_WriteVariable(uint16_t VirtAddress, uint16_t Data)
{
uint16_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;
}
uint16 EEPROMClass::init(void)
{
uint16 status0, status1;
FLASH_Status FlashStatus;
FLASH_Unlock();
Status = EEPROM_NO_VALID_PAGE;
status0 = (*(__io uint16 *)PageBase0);
status1 = (*(__io uint16 *)PageBase1);
switch (status0)
{
/*
Page0 Page1
----- -----
EEPROM_ERASED EEPROM_VALID_PAGE Page1 valid, Page0 erased
EEPROM_RECEIVE_DATA Page1 need set to valid, Page0 erased
EEPROM_ERASED make EE_Format
any Error: EEPROM_NO_VALID_PAGE
*/
case EEPROM_ERASED:
if (status1 == EEPROM_VALID_PAGE) // Page0 erased, Page1 valid
Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED);
else if (status1 == EEPROM_RECEIVE_DATA) // Page0 erased, Page1 receive
{
FlashStatus = FLASH_ProgramHalfWord(PageBase1, EEPROM_VALID_PAGE);
if (FlashStatus != FLASH_COMPLETE)
Status = FlashStatus;
else
Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED);
}
else if (status1 == EEPROM_ERASED) // Both in erased state so format EEPROM
Status = format();
break;
/*
Page0 Page1
----- -----
EEPROM_RECEIVE_DATA EEPROM_VALID_PAGE Transfer Page1 to Page0
EEPROM_ERASED Page0 need set to valid, Page1 erased
any EEPROM_NO_VALID_PAGE
*/
case EEPROM_RECEIVE_DATA:
if (status1 == EEPROM_VALID_PAGE) // Page0 receive, Page1 valid
Status = EE_PageTransfer(PageBase0, PageBase1, 0xFFFF);
else if (status1 == EEPROM_ERASED) // Page0 receive, Page1 erased
{
Status = EE_CheckErasePage(PageBase1, EEPROM_ERASED);
if (Status == EEPROM_OK)
{
FlashStatus = FLASH_ProgramHalfWord(PageBase0, EEPROM_VALID_PAGE);
if (FlashStatus != FLASH_COMPLETE)
Status = FlashStatus;
else
Status = EEPROM_OK;
}
}
break;
/*
Page0 Page1
----- -----
EEPROM_VALID_PAGE EEPROM_VALID_PAGE Error: EEPROM_NO_VALID_PAGE
EEPROM_RECEIVE_DATA Transfer Page0 to Page1
any Page0 valid, Page1 erased
*/
case EEPROM_VALID_PAGE:
if (status1 == EEPROM_VALID_PAGE) // Both pages valid
Status = EEPROM_NO_VALID_PAGE;
else if (status1 == EEPROM_RECEIVE_DATA)
Status = EE_PageTransfer(PageBase1, PageBase0, 0xFFFF);
else
Status = EE_CheckErasePage(PageBase1, EEPROM_ERASED);
break;
/*
Page0 Page1
----- -----
any EEPROM_VALID_PAGE Page1 valid, Page0 erased
EEPROM_RECEIVE_DATA Page1 valid, Page0 erased
any EEPROM_NO_VALID_PAGE
*/
default:
if (status1 == EEPROM_VALID_PAGE)
Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED); // Check/Erase Page0
else if (status1 == EEPROM_RECEIVE_DATA)
{
FlashStatus = FLASH_ProgramHalfWord(PageBase1, EEPROM_VALID_PAGE);
if (FlashStatus != FLASH_COMPLETE)
Status = FlashStatus;
else
Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED);
}
break;
}
return Status;
}
/**
* @brief Verify if active page is full and Writes variable in EEPROM.
* @param Address: 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
* - EEPROM_PAGE_FULL: if valid page is full (need page transfer)
* - EEPROM_NO_VALID_PAGE: if no valid page was found
* - EEPROM_OUT_SIZE: if EEPROM size exceeded
* - Flash error code: on write Flash error
*/
uint16 EEPROMClass::EE_VerifyPageFullWriteVariable(uint16 Address, uint16 Data)
{
FLASH_Status FlashStatus;
uint32 idx, pageBase, pageEnd, newPage;
uint16 count;
// Get valid Page for write operation
pageBase = EE_FindValidPage();
if (pageBase == 0)
return EEPROM_NO_VALID_PAGE;
// Get the valid Page end Address
pageEnd = pageBase + PageSize; // Set end of page
for (idx = pageEnd - 2; idx > pageBase; idx -= 4)
{
if ((*(__io uint16*)idx) == Address) // Find last value for address
{
count = (*(__io uint16*)(idx - 2)); // Read last data
if (count == Data)
return EEPROM_OK;
if (count == 0xFFFF)
{
FlashStatus = FLASH_ProgramHalfWord(idx - 2, Data); // Set variable data
if (FlashStatus == FLASH_COMPLETE)
return EEPROM_OK;
}
break;
}
}
// Check each active page address starting from begining
for (idx = pageBase + 4; idx < pageEnd; idx += 4)
if ((*(__io uint32*)idx) == 0xFFFFFFFF) // Verify if element
{ // contents are 0xFFFFFFFF
FlashStatus = FLASH_ProgramHalfWord(idx, Data); // Set variable data
if (FlashStatus != FLASH_COMPLETE)
return FlashStatus;
FlashStatus = FLASH_ProgramHalfWord(idx + 2, Address); // Set variable virtual address
if (FlashStatus != FLASH_COMPLETE)
return FlashStatus;
return EEPROM_OK;
}
// Empty slot not found, need page transfer
// Calculate unique variables in page
count = EE_GetVariablesCount(pageBase, Address) + 1;
if (count >= (PageSize / 4 - 1))
return EEPROM_OUT_SIZE;
if (pageBase == PageBase1)
newPage = PageBase0; // New page address where variable will be moved to
else
newPage = PageBase1;
// Set the new Page status to RECEIVE_DATA status
FlashStatus = FLASH_ProgramHalfWord(newPage, EEPROM_RECEIVE_DATA);
if (FlashStatus != FLASH_COMPLETE)
return FlashStatus;
// Write the variable passed as parameter in the new active page
FlashStatus = FLASH_ProgramHalfWord(newPage + 4, Data);
if (FlashStatus != FLASH_COMPLETE)
return FlashStatus;
FlashStatus = FLASH_ProgramHalfWord(newPage + 6, Address);
if (FlashStatus != FLASH_COMPLETE)
return FlashStatus;
return EE_PageTransfer(newPage, pageBase, Address);
}
