The EEPROM_UpdateBankStatus() function provides functionality for updating the EEPROM bank status. This function called from the EEPROM_Write() function. The EEPROM bank status is first read to determine how to proceed.

Bank_Status[0] = *(Bank_Pointer);
Page_Status[0] = *(Page_Pointer); 

If this status indicates the EEPROM bank is empty, the status is changed to Current and programmed.

// Set Bank Status to Current Bank
Bank_Status[0] = CURRENT_BANK;
Bank_Status[1] = CURRENT_BANK;
Bank_Status[2] = CURRENT_BANK;
Bank_Status[3] = CURRENT_BANK;

// 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*) Bank_Pointer,
                                               Bank_Status, 4, 0, 0,
                                                 Fapi_AutoEccGeneration);

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

// Set Page Pointer to first page of current bank
Page_Counter = 0;
Page_Pointer = Bank_Pointer + 8;

If the status is not empty, the next check is for a Current EEPROM Bank with all pages used in the EEPROM bank (full EEPROM bank). In this case, the current EEPROM banks status will be updated to show the EEPROM bank is Full and the next EEPROM banks status will be updated to Current to allow programming of the next EEPROM bank. As a last step, the page pointer is updated to the first page of the new EEPROM bank.

// Set Bank Status to Used Bank
Bank_Status[0] = CURRENT_BANK;
Bank_Status[1] = CURRENT_BANK;
Bank_Status[2] = CURRENT_BANK;
Bank_Status[3] = CURRENT_BANK;

// 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 full bank
oReturnCheck = Fapi_issueProgrammingCommand((uint32*) Bank_Pointer + 2,
                                              Bank_Status, 4, 0, 0,
                                                 Fapi_AutoEccGeneration);

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

// Increment Bank Pointer to next bank
Bank_Pointer += Bank_Size;

// Set Bank Status to Current Bank
Bank_Status[0] = CURRENT_BANK;
Bank_Status[1] = CURRENT_BANK;
Bank_Status[2] = CURRENT_BANK;
Bank_Status[3] = CURRENT_BANK;

// 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*) Bank_Pointer,
                                              Bank_Status, 4, 0, 0,
                                                 Fapi_AutoEccGeneration);

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

// Set Page Pointer to first page of current bank
Page_Counter = 0;
Page_Pointer = Bank_Pointer + 8;