IAP programming

[Jimis]

Hi

I'm trying use In App programming for the STM32L432KC board. Unfortunately there is no working example provided (app note AN4657 has STM3210C_EVAL and STM32L476G_EVAL which is dual bank).

I have managed to modify the example and written correctly the Flash (verified with debugger). The problem is when jumping to the address I get a hardfault_handler error.

The details of my setup are these:

I have separated flash in 2 areas since I don't have dual banks

area A 0x0800 0000

area B 0x0802 0000

I write my new binary (blink code) file in area B and I jump using the following code, where APPLICATION_ADDRESS=0x0802 0000 (area B):

 //SCB->VTOR = APPLICATION_ADDRESS;
 
 
 /* execute the new program */
 
 JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
 
 /* Jump to user application */
 
 JumpToApplication = (pFunction) JumpAddress;
 
 
 /* Initialize user application's Stack Pointer */
 
 __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
 
 JumpToApplication();

I read in this post that you need to add SCB->VTOR = APPLICATION_ADDRESS; for the interrupt vectors to initialize to the new address but I still get the error

inside the hardfault_handler I read the SCB and get the following

which gives a BFSR register error at address 0x20010000 which points to a reserved space

Any ideas what I'm doing wrong ? According to the example you don't need to do anything else after you have loaded new program to flash. Just set MSP and jump.

Thanks in advance

[Jimis]

Found it. I needed to re-enable IRQs in the loaded app (blink).

Question is why didn't blink crash before without this line ? Isn't the init of the code the same when uploading via debugger or via IAP ?

Wasted so many hours for a few details that could have been written in the app note. Really frustrating