STM32 jump to bootloader

gistfile1.txt

void JumpToBootloader(void) {
    void (*SysMemBootJump)(void);

    /**
     * Step: Set system memory address.
     *
     *       For STM32F429, system memory is on 0x1FFF 0000
     *       For other families, check AN2606 document table 110 with descriptions of memory addresses
     */
    volatile uint32_t addr = 0x1FFF0000;

    /**
     * Step: Disable RCC, set it to default (after reset) settings
     *       Internal clock, no PLL, etc.
     */
#if defined(USE_HAL_DRIVER)
    HAL_RCC_DeInit();
    HAL_DeInit(); // add by ctien
#endif /* defined(USE_HAL_DRIVER) */
#if defined(USE_STDPERIPH_DRIVER)
    RCC_DeInit();
#endif /* defined(USE_STDPERIPH_DRIVER) */

    /**
     * Step: Disable systick timer and reset it to default values
     */
    SysTick->CTRL = 0;
    SysTick->LOAD = 0;
    SysTick->VAL = 0;

    /**
     * Step: Disable all interrupts
     */
//    __disable_irq(); // changed by ctien

    /**
     * Step: Remap system memory to address 0x0000 0000 in address space
     *       For each family registers may be different.
     *       Check reference manual for each family.
     *
     *       For STM32F4xx, MEMRMP register in SYSCFG is used (bits[1:0])
     *       For STM32F0xx, CFGR1 register in SYSCFG is used (bits[1:0])
     *       For others, check family reference manual
     */
    //Remap by hand... {
    SYSCFG->MEMRMP = 0x01;
    //} ...or if you use HAL drivers
    //__HAL_SYSCFG_REMAPMEMORY_SYSTEMFLASH();    //Call HAL macro to do this for you

    /**
     * Step: Set jump memory location for system memory
     *       Use address with 4 bytes offset which specifies jump location where program starts
     */
    SysMemBootJump = (void (*)(void)) (*((uint32_t *)(addr + 4)));

    /**
     * Step: Set main stack pointer.
     *       This step must be done last otherwise local variables in this function
     *       don't have proper value since stack pointer is located on different position
     *
     *       Set direct address location which specifies stack pointer in SRAM location
     */
    __set_MSP(*(uint32_t *)addr);

    /**
     * Step: Actually call our function to jump to set location
     *       This will start system memory execution
     */
    SysMemBootJump();

    /**
     * Step: Connect USB<->UART converter to dedicated USART pins and test
     *       and test with bootloader works with STM32 STM32 Cube Programmer
     */
}