STM32U575 Custom bootloader Bootloader

[nima.askari]

Hello. I would like to write my own bootloader, but jump function does not work. could you send a complete example for stm32U575. 

[nima.askari]

Please Send me an example. 

[Rim LANDOLSI · Accepted solution]

Hello @nima.askari,

Here is an example code for Bootloader application project:

For the Boot’s code:

• Add these instructions to the main.c

typedef void (*pFunction)(void);
#define APPLICATION_ADDRESS 0x08003800 (this is an example address)
pFunction JumpToApplication;
JumpToApplication = (pFunction) (*(volatile uint32_t*) (APPLICATION_ADDRESS + 4));
__set_MSP(*(uint32_t*) APPLICATION_ADDRESS);
JumpToApplication();

• Change the FLASH memory size in the linker file according to the application start address.

FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 28K (this is an example)

For the application’s code:

• Change the FLASH memory size in the linker file according to the application start address.

FLASH (rx) : ORIGIN = 0x08003800, LENGTH = 100K

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Thank you,

Rim.

[nima.askari]

Hello @Rim LANDOLSI , thanks for your answer. Is it works for stm32U5 series? I read something about writing to option bytes. I tried your sample, but it doesn't work.

[nima.askari]

I found out the problem. ICACH should not be enable in bootloader .