The EEPROM_UpdatePageStatus() function provides functionality for updating the previous page’s status. This function is called from the EEPROM_Write() function. The page status is first read to determine how to proceed.

Bank_Status[0] = *(Bank_Pointer);   // Read Bank Status from Bank Pointer
Page_Status[0] = *(Page_Pointer);   // Read Page Status from Page Pointer

If this status indicates that the page is blank, the function is exited as this status is updated in the EEPROM_Write() function. Otherwise, the page status is updated to show it is Full and the page pointer is incremented to prepare to program the next page:

// Check if Page Status is blank. If so return to EEPROM_WRITE.
if(Page_Status[0] == BLANK_PAGE)
    return;

// Program previous page's status to Used Page
else
{

    // Set Page Status to Used Page
    Page_Status[0] = CURRENT_PAGE;
    Page_Status[1] = CURRENT_PAGE;
    Page_Status[2] = CURRENT_PAGE;
    Page_Status[3] = CURRENT_PAGE;

    // Clears status of previous Flash operation
    ClearFSMStatus();

    Fapi_setupBankSectorEnable(FLASH_WRAPPER_PROGRAM_BASE+FLASH_O_CMDWEPROTA, WE_Protection_A_Mask);
    Fapi_setupBankSectorEnable(FLASH_WRAPPER_PROGRAM_BASE+FLASH_O_CMDWEPROTB, WE_Protection_B_Mask);

    // Program Bank Status to current bank
    oReturnCheck = Fapi_issueProgrammingCommand((uint32*) Page_Pointer+2,
                                                Page_Status, 4, 0, 0,
                                                 Fapi_AutoEccGeneration);

    // Wait for completion and check for any programming errors
    EEPROM_CheckStatus(&oReturnCheck);

    // Increment Page Pointer to next page
    Page_Pointer += EEPROM_PAGE_DATA_SIZE + 8;
}