STM32H7 UART1 bootloader fails after TouchGFX init

[Gabriel T]

Hi,

MCU : STM32H743ZI

TouchGFX : 4.18.1

After I execute HAL::initialize(), my jump doesn't work anymore, I do get in the bootloader but the USART1 bootload doesn't ACK my requests. If I jump before HAL::initialize it does work. I tried to look at the register modified during HAL::initialize but I found nothing relevant and I do not have access to the code.

In TouchGFX code "TouchGFXGeneratedHAL.cpp" :

void TouchGFXGeneratedHAL::initialize()
{
  // BOOTLOAD jump working ok here
  HAL::initialize();
  // BOOTLOAD jump fails here

My jump code :

void Bootloader_Jump(void)
{
 uint32_t i=0;
 void (*SysMemBootJump)(void);
 volatile uint32_t BootAddr = 0x1FF09800;
 MODIFY_REG(RCC->D2CCIP2R, RCC_D2CCIP2R_USART16SEL, (uint32_t)(0U));
 __disable_irq();
 SysTick->CTRL = 0;
 HAL_RCC_DeInit();
 for (i=0;i<5;i++)
 {
 NVIC->ICER[i]=0xFFFFFFFF;
 NVIC->ICPR[i]=0xFFFFFFFF;
 }
 __enable_irq();
 
 /* Set up the jump to booloader address + 4 */
 SysMemBootJump = (void (*)(void)) (*((uint32_t *) ((BootAddr + 4))));
 
 /* Set the main stack pointer to the bootloader stack */
 __set_MSP(*(uint32_t *)BootAddr);
 
 /* Call the function to jump to bootloader location */
 SysMemBootJump();
 
 while (1)
 {
 /* Code should never reach this loop */
 }
}

Any ideas to make it work ?

[Gabriel T]

The issue also appears with USB bootload, before "HAL::initialize();" I get the correct "DFU in FS Mode". After "HAL::initialize();" I get unrecognized USB device

[MM..1]

And what? Jump from app isnt official start. And

 __disable_irq();
 SysTick->CTRL = 0;
 HAL_RCC_DeInit();
 for (i=0;i<5;i++)
 {
 NVIC->ICER[i]=0xFFFFFFFF;
 NVIC->ICPR[i]=0xFFFFFFFF;
 }
 __enable_irq();

isnt perfect way to handle runned peripherals to valid state.

Use watchdog reset and jump to boot on main start.

[Gabriel T]

Thanks for your reply, I'm not sure I got what you tried to say. We want to perform this kind of bootloader jump https://community.st.com/s/article/STM32H7-bootloader-jump-from-application

[MM..1]

 int main(void)
{
 /* USER CODE BEGIN 1 */
 if(__HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST)) __HAL_RCC_CLEAR_RESET_FLAGS();
 if(__HAL_RCC_GET_FLAG(RCC_FLAG_IWDGRST)) {__HAL_RCC_CLEAR_RESET_FLAGS();Bootloader_Jump();}