Posted on May 10, 2018 at 19:06Hello, I have a board with stm32f446rc processor and I don't get to connect bootloader with stm32 flashloader.
Following below this function used to access the bootloader on chip. I am using USART1 (PA9,PA10) to connect RS232.
void JumpToBootloader(void) {
void (*SysMemBootJump)(void);
/**
* Step: Set system memory address.
*
* For STM32F446, 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.
*/
RCC_DeInit();
__HAL_RCC_SYSCFG_CLK_ENABLE();
/**
* 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();
__DSB();
/**
* 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
*/
__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
*/
/* Remap is bot visible at once. Execute some unrelated command! */
__DSB();
__ISB();
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
*/
while(1);
}
