Problem for perform a switch bank on STM32U385Rg

[Sixela]

Hello all,

I allow to send this message after a long attempt to perform a switch bank on my STM32U385RG.

This is part of my code:

/*--------------------------------------------------------*/
void OptionBytes_SwapBanks(void)
/*--------------------------------------------------------*/
{
    FLASH_OBProgramInitTypeDef OBInit;
    HAL_StatusTypeDef status;

    swo_printf("Current USERConfig: 0x%08lx\n", OBInit.USERConfig);

    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPERR | FLASH_FLAG_PROGERR | FLASH_FLAG_WRPERR |
                             FLASH_FLAG_PGAERR | FLASH_FLAG_SIZERR | FLASH_FLAG_PGSERR |
                             FLASH_FLAG_OPTWERR);
    uint32_t optr = FLASH->OPTR;

    if (optr & FLASH_OPTR_DUALBANK)
       {
           swo_printf("Dual Bank is ENABLED\n");
       }
       else
       {
           swo_printf("Dual Bank is DISABLED\n");
       }

    if (optr & FLASH_OPTR_SWAP_BANK)
       {
    	   swo_printf("Swap Bank is ENABLED\n");
	OBInit.OptionType = OPTIONBYTE_USER;
        OBInit.USERType = OB_USER_SWAP_BANK;
        OBInit.USERConfig = OB_SWAP_BANK_DISABLE;
       }
       else
       {
    	   swo_printf("Swap Bank is DISABLED\n");
	OBInit.OptionType = OPTIONBYTE_USER;
    	OBInit.USERType = OB_USER_SWAP_BANK;;
    	OBInit.USERConfig = OB_SWAP_BANK_ENABLE;
       }
    status = HAL_FLASHEx_OBProgram(&OBInit);
    if (status != HAL_OK)
    {
        swo_printf("Error in programming Option Bytes: %ld\n", HAL_FLASH_GetError());
        HAL_FLASH_OB_Lock();
        HAL_FLASH_Lock();
        return;
    }
}

You can view some logs in attached files:

           

I can do the swap directly with STMCubeprogrammer but I cannot do it with code so i suppose that it's an error of configuration or code.

[TDK]

Do you have CPU_IN_SECURE_STATE defined? My guess is something with that.

[KDJEM.1]

Hello @Sixela and welcome to the community;

I recommend you to refer to FLASH_SwapBanks example and check your code. This example presents a guide through the configuration steps to program internal Flash memory bank 1 and bank 2, and to swap between both of them by mean of the FLASH HAL API. This example has been tested with NUCLEO-U385RG-Q board. Also, I advise you to look at the README.md to run this example.

Thank you.

Kaouthar

Latest commit

[Sixela]

i don't know how i can active or deactivate the CPU_IN_SECURE_STATE .
I had already deactivate all OptionBytes for security (TZEN,WRP,...) and i don't use the MPU actually

[Sixela]

Hello,

I have already converted the code from the example into a unified code, but it's not working either.
I think there may be something interfering with the exchange.

I don't know why perforrm the swapping is impossible for this one.

[Sixela]

Hi,

I had to check the CPU_IN_SECURE_STATE macro in the file that is present:

#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
#define CPU_IN_SECURE_STATE
#endif

It's defined in stm32u385xx.h in the CMSIS folder, but not in other files as stm32u3xx_HAL_def.h.

/* To keep after #include "stm32u3xx.h" to have CPU_IN_SECURE_STATE available */
#if defined (CPU_IN_SECURE_STATE) // symbol not found
#include <arm_cmse.h>
#endif /* CPU_IN_SECURE_STATE */

I suspect that the code is not wrong because i have the same that the exemple available on the Git Repository, but that a remaining parameter blocks the programming of the OB.

Do you have an idea for that ?