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As for STM32H563 MCU, will it result in a system reset after executing the function HAL_FLASH_OB_Launch? From my experiment, before executing HAL_FLASH_OB_Launch, I can read data from MCU via I2C while all returned data become 0xFF(i.e. invalid data) after executing this function. It seems that the MCU is suspended or reset. When I tried to trace the code through Debugger Section in Keil, the code can run smoothly to subsequent routines.

Here is my code below.

void EnableWriteProtect(uint8_t image)
{
    FLASH_OBProgramInitTypeDef OBInit = {0};
    FLASH_OBProgramInitTypeDef sOBPrev = {0};

    uint32_t WRPSector;

    /* Unlock the User Flash area */
    HAL_FLASH_Unlock();
    HAL_FLASH_OB_Unlock();

    /* Get the boot configuration status */
    HAL_FLASHEx_OBGetConfig(&OBInit);

    WRPSector = OBInit.WRPSector | BIT(0);

    OBInit.Banks = FLASH_BANK_2;
    OBInit.OptionType = OPTIONBYTE_WRP;
    OBInit.WRPState = OB_WRPSTATE_ENABLE;
    OBInit.WRPSector = WRPSector;
    HAL_FLASHEx_OBProgram(&OBInit);

    /* Launch Option bytes loading */
    HAL_FLASH_OB_Launch();

    /* Unlock the User Flash area */
    HAL_FLASH_OB_Lock();
    HAL_FLASH_Lock();
}

From my experiment, before executing HAL_FLASH_OB_Launch, I can read data from MCU via I2C while all returned data become 0xFF(i.e. invalid data) after executing this function. It seems that the MCU is suspended or reset. When I tried to trace the code through Debugger Section in Keil, the code can run smoothly to subsequent routines.

My expectation: I hope to implement write protection for specific MCU flash areas normally without resetting the MCU.

本文标签： flashDoes executing the function HALFLASHOBLaunch cause a system reset on STM32H563 MCUStack Overflow

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