How to enter ST USART Bootloader from Code?

[MootSeeker]

Im trying to jump to bootloader section from my Code. I'm trying to update the firmware over USART with the intergrated bootloader. In my application I'm using USART2 (PA2/PA3) on a STM32L431CCU6 Microcontroller running native FreeRTOS.

My Code to initialize should work:

	// Set Memory Boot Jump address
	SysMemBootJump = (void (*) (void)) (*((uint32_t *) 0x1FFF0004)); //device dependent parameter System Memory + 4
 
	// Set Display to Firmware Update Mode
	display_show( FW_UPDATE );
 
	taskENTER_CRITICAL( );
	{
//		vTaskSuspendAll( );
 
		// Turn off Peripherals
		HAL_TIM_Base_MspDeInit(&htim15);
		HAL_RTC_MspDeInit(&hrtc);
		HAL_UART_MspDeInit(&huart2);
		HAL_UART_MspDeInit(&huart1);
		HAL_SPI_MspDeInit(&hspi2);
		HAL_SPI_MspDeInit(&hspi1);
		HAL_CRC_MspDeInit(&hcrc);
 
		// Disable Interrupts
		__disable_irq();
 
		// Remap Memory
		__HAL_SYSCFG_REMAPMEMORY_SYSTEMFLASH();
 
		// Reset Systick timer
		SysTick->CTRL = 0;		//reset the Systick Timer
		SysTick->LOAD = 0;
		SysTick->VAL = 0;
 
		__set_PRIMASK (1);
		__set_MSP(*((uint32_t *)0x1FFF0000U));	//expected stack pointer value is the value at adress 0x1FFF0000U
 
		SysMemBootJump();
 
		while( FOREVER );
	}
	taskEXIT_CRITICAL( );

When I try to debugg it, I reach until the jump command and then the debugger is showing nothing anymore. So it looks like it makes the jump.

When analysing the USART interface I see that the device is receiving the 0x7F Command but does not responce on this.

My boot options are all checked:

The Bootpin BOOT0 (PH3) is connected to GND via a 10k resistor.

Do I missed something, that the bootloader does not response?

[MM..1]

Your parity is set to Even ? 8 - E - 1

[MootSeeker]

Yes it is set to Even. I also tried None but that also not worked.

[MM..1]

Switch in Cubeprogrammer connect to USART and try connect

And primary read AN2606 diagram about interface detection order and check if no other interface is detected .

[MootSeeker]

I already did that. It is also not working.

According to AN2606 USART is the first interface to check.

[MM..1]

Interfaces is checked in loop. Quickest as you 7F if other is detected...

Check your connections...

[MootSeeker]

What should I check?

the Connection (Usart) is working in normal use.

The other interfaces are not used, they don‘t have a changing signal on the pins.

Are the boot option bits set correct? Or do I have to change something before jumping to bootloader?

[MootSeeker · Accepted solution]

I missed

HAL_DeInit();

before jumping to bootloader.

taskENTER_CRITICAL( );
	{
		vTaskSuspendAll( );
 
		// Turn off Peripherals
		HAL_TIM_Base_MspDeInit(&htim15);
		HAL_RTC_MspDeInit(&hrtc);
		HAL_UART_MspDeInit(&huart2);
		HAL_UART_MspDeInit(&huart1);
		HAL_SPI_MspDeInit(&hspi2);
		HAL_SPI_MspDeInit(&hspi1);
		HAL_CRC_MspDeInit(&hcrc);
 
		HAL_DeInit();
 
		// Reset Systick timer
		SysTick->CTRL = 0;		//reset the Systick Timer
		SysTick->LOAD = 0;
		SysTick->VAL = 0;
 
		// Remap Memory
		__HAL_SYSCFG_REMAPMEMORY_SYSTEMFLASH();
 
		// Disable Interrupts
		__disable_irq();
 
 
		__set_PRIMASK (1);
		__set_MSP(*((uint32_t *)0x1FFF0000U));	//expected stack pointer value is the value at adress 0x1FFF0000U
 
 
		SysMemBootJump();
		while( FOREVER );
	}
	taskEXIT_CRITICAL( );

 Bootloader is now working.