This document describes the software solution for substituting standalone EEPROM by emulating the EEPROM mechanism using the on-chip Flash of STM32F40x/STM32F41x devices.
The document details how to replace external EEPROMs with internal Flash memory in STM32F40x/STM32F41x devices. It explains that while the device features 4 Kbytes of backup SRAM for native EEPROM emulation, this solution is intended for applications where VBAT power is unavailable or the SRAM is used for other purposes.
The note provides a software algorithm to emulate EEPROM by utilizing at least two Flash memory sectors. The implementation includes mechanisms for wear leveling, page header recovery in case of power loss, and background sector erasure to ensure data integrity without interrupting CPU operations.
| Backup SRAM Size | 4 Kbytes |
|---|---|
| System Clock Frequency (Example) | 168 MHz |
It describes the software solution for substituting standalone EEPROM by emulating the EEPROM mechanism using the on-chip Flash.
The driver must be lightweight with a simple API, have reduced footprint, and support background sector erase.