Emulated EEPROM is not erased after flashing new code

[MGrub.3]

It also doesn’t erase after starting new debug session. Is that expected behavior?

I am using STM32L476, and I downloaded X-CUBE-EEPROM software package, included it into my project and it works fine. EEPROM content is retained after NVIC_SystemReset() and after power up, which is great. But I want to start with clean EEPROM every time I flash new code or start a new debug session.

In X-CUBE-EEPROM example code, in EE_Init() it calls EE_Format() if no active page is present, but it never goes there, except first time every EEPROM is initiated.

I couldn’t find any way around this?

Appreciate your help.

[S.Ma]

workaround: use the compilation date and or time to put it in eeprom area and compare with the one in flash. if mismatch after reset, format and write the new time...

[S.Ma]

you can also do it manually coding a version number to reduce space

[KnarfB]

Having some kind of version info stored with your EEPROM data is always a good idea. If you want to start "with clean EEPROM every time I flash new code or start a new debug session" you can call EE_Format() manually. You also may do that conditionally only in the Debug configuration by using "#ifdef DEBUG".

[MM..1 · Accepted solution]

EEPROM is emulated on end of flash and your code is less size. Check setings for flash code, default is i mean erase only sectors for code

then when you flash new version EEPROM stay valid and untouched

[Tesla DeLorean]

The code doesn't understand what situations you want persistent memory to stop being persistent.

Use Erase All or Mass Erase options when uploading new firmware to debug.

[MGrub.3]

I am using STM32 IDE (Eclipse based) and I can't find Erase All or Mass Erase options, and also any other settings regarding flashing the code to target.

I will explore recommended options and decide what works best for me.

Thank you all.

[Tesla DeLorean]

Yeah, probably a checkbox item in the debug settings. In Keil we have Flash -> Erase from the top level IDE

In the debug settings Flash Download, Download Function, Erase Full Chip