Not an issue - a question - SCB->VTOR issue with F103? about stm32-bootloader

[akospasztor]

Hi arkhipenko,

My guess is that the startup code of the application firmware explicitly sets the VTOR back to the starting address of the flash. What kind of startup code do you use? I remember that the cube-generated startup code in system_stm32l4xx.c explicitly sets the VTOR in the SystemInit() function.

Cheers,
Akos

[arkhipenko]

Hi!
Thanks for answering.
Yes, the startup code is in system_stm32f1xx.c file and the VTOR is set there appropriately.
After playing a bit with the code, it started to work! I just moved the stack assignment before VTOR in the bootloader and a pinMode() later in the setup() in the target code and it somehow helped.
I can not explain why, but it did. Thank you.

[akospasztor]

Hi arkhipenko,

I don't exactly know what pinMode() does in your setup() (nor do I know what setup() does actually 😅), but does that maybe set/change the boot pins or boot configuration? If yes, then your problem was actually that you changed the boot mode of the MCU, which you don't need :)

Anyway, I'm glad that you could resolve the problem!

Cheers,
Akos