On this Cortex own code relocates vectors to ram.
And start bootloader jump function is here mentioned many times but for you repeat
/**
* 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);
/**
* 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)));
GPIOA->ODR ^= LED_2;
/**
* 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
*/
}
