How to change option bytes in STM32CubeIDE?

GearHead · ‎2020-07-15

I'm working with an STM32F04, and I'd like to change the option bytes so that my firmware can't be read back out after the device is programmed. I can tell from documentation I need to set the RDP byte to something besides 0xAA or 0xCC, but there isn't much about how to do this from the IDE.

Is there an option or a file I can edit in the STM32CubeIDE to modify the byte once my firmware is programmed?

Thank you!

TDK · ‎2020-07-15

The only way to do this in STM32CubeIDE is to add a separate section in the linker for your option bytes.

The easiest way to change them is probably in STM32CubeProgrammer or in your startup code. Just add a section that checks RDP and change it if necessary.

If you feel a post has answered your question, please click "Accept as Solution".

View solution in original post

TDK · ‎2020-07-15

The only way to do this in STM32CubeIDE is to add a separate section in the linker for your option bytes.

The easiest way to change them is probably in STM32CubeProgrammer or in your startup code. Just add a section that checks RDP and change it if necessary.

If you feel a post has answered your question, please click "Accept as Solution".

GearHead · ‎2020-07-16

Thank you! I just downloaded CubeProgrammer and this is exactly what I was hoping for - automatic programming and option byte modification. Hopefully this helps the next person - it's easy to get lost with all of the different IDE/ DFuse/ etc. tools available