IAP problem - user app not working

Posted on August 15, 2017 at 14:11

Hello. I am trying to implement an in application programming to an F303 processor.

I got to a point where I can successfully download a whole new firmware to my desired location (0x08010000) through UART. I checked whether the data are OK with STLINK and there is no difference between the firmware and memory starting from 0x08010000.

The custom firmware should blink the LED but when I make a jump to the user application the LED just lights up and doesn't blink so there clearly must be something wrong.

In my custom 'blink' firmware I changed the linker script so that the FLASH starts from 0x08010000

MEMORY

{

RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 40K

CCMRAM (rw) : ORIGIN = 0x10000000, LENGTH = 8K

FLASH (rx) : ORIGIN = 0x8010000, LENGTH = 192K

}

My 'jump' code:

&sharpdefine USER_PROG_ADDRESS FLASH_BASE+(uint32_t)0x10000

typedef void (*pFunction)(void);

pFunction JumpToApplication;

uint32_t JumpAddress;

JumpAddress = *(__IO uint32_t*) (USER_PROG_ADDRESS + 4);

JumpToApplication = (pFunction) JumpAddress;

__set_MSP(*(__IO uint32_t*) USER_PROG_ADDRESS);

JumpToApplication();

What am I missing? Did I forget to do something?

#stm32f303 #iap