jump to bootloader.

[Snm.1]

I wonder the jump to defauld bootloader with a software way. is it possible??

[Tesla DeLorean]

>>Is it possible??

Depends on the STM32, but yes generally possible, the MCU has control-transfer methods as part of it's basic operation.

The Vector Table is a list of addresses, you can use function pointers.

[Snm.1]

hello, I will use stm32l052. but there are very few resource. I wounder do you have any idea aboud this topic :)).

[MM..1]

Try search first ...

[Snm.1]

I didn't found, therefore i ask.

[MM..1]

[MM..1]

One example address and info search in AN2606

/**
 * Function to perform jump to system memory boot from user application
 *
 * Call function when you want to jump to system memory
 */
void JumpToBootloader(void) {
	void (*SysMemBootJump)(void);
 
	NVIC_InitTypeDef NVIC_InitStructure;
 
	/**
	 * Step: Set system memory address. 
	 * 
	 * For other families, check AN2606 document table 110 with descriptions of memory addresses 
	 */
	volatile uint32_t addr = 0x1FFFEC00; //0x1FFF0000;
 
 	
	/**
	 * Step: Disable RCC, set it to default (after reset) settings
	 * Internal clock, no PLL, etc.
	 */
#if defined(USE_HAL_DRIVER)
	HAL_RCC_DeInit();
#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();
	
	/**
	 * 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... {
#if defined(STM32F4)
	SYSCFG->MEMRMP = 0x01;
#endif
//#if defined(STM32F0)
	SYSCFG->CFGR1 = 0x01;
//#endif
	//} ...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 Flash Loader Demonstrator software
	 */
}