Posted on November 29, 2014 at 12:54
so how can i jump to system memory bootloader with my software, without using mcu boot pins?
#usart #stm32f4 #bootloader
i have custom board with STM32F427VI and want to boot from usart3 via bootloader inside system memory.
boot0 pin is low and boot1 pin is NC. i dont want to switch boot pins. because eventually these pin connections must bepermanent
. just want to jump system bootloader address by my embedded software. if i set boot0 to high, i can drop the code to the bootloader and can update firmware by usart3. i used below software (STSW-MCU005) for this. so i can understand that my pinout connections are not wrong.http://www.st.com/web/en/catalog/tools/PF257525
i read following passage from reference guide (RM0090) page 70 ''To select boot from Flash memory bank 2, clear the BFB2 bit in the user option bytes. When this bit is set and the boot pins are in the boot from main Flash memory configuration, the device boots from system memory, and the boot loader jumps to execute the user application programmed in Flash memory bank 2. For further details, please refer to AN26'' so i used following code for jumping to bootloader address:RCC_DeInit();
// shutdown any tasks
// reset the systick timer
SysTick->CTRL = 0;
SysTick->LOAD = 0;
SysTick->VAL = 0;
__set_PRIMASK(1);
// disable interrupts
FLASH_OB_Unlock();
// flash option bytes unlock
FLASH->OPTCR |= 0x10;
// set BFB2 bit
FLASH_OB_Lock();
// flash option bytes lock
__set_MSP(*(__IO uint32_t*) 0x20002318);
// Initialize user application's Stack Pointer
(*((
void
(*)(
void
))(*(unsigned
long
*)0x1fff0004)))(); // jump address
