Flashing firmware using System Bootloader and STM32CubeProgrammer on Nucleo-G491RE

[newbie_stm32]

Hi, I am working on making firmware write work using System Bootloader and USART1 interface on NUCLEO-G491RE. I have a code snippet taken from the internet which jumps to the System Bootloader section of the code once the User Button is pressed. I have interfaced a USB to UART converter at PA9, PA10, and GND as suggested in the AN2606.

void BootloaderInit() {
	void (*SysMemBootJump)(void);
 
	volatile uint32_t addr = 0x1FFF0000;
	HAL_RCC_DeInit();
 
	SysTick->CTRL = 0;
	SysTick->LOAD = 0;
	SysTick->VAL = 0;
 
	__HAL_SYSCFG_REMAPMEMORY_SYSTEMFLASH();
	__disable_irq();
	SysMemBootJump = (void (*)(void)) (*((uint32_t*) (addr + 4)));
	__set_MSP(*(uint32_t*) addr);
	SysMemBootJump();
}

But once the User Button is pressed and tried to connect to the UART interface using STM32CubeProgrammer it shows

Why is the firmware upgrade not working?

[MM..1]

First check hw mode

after this work try jump into.

[newbie_stm32]

Hi, @mm_it..1​ I have already followed this and changed them using STM32CubeProgrammer using the ST-LINK option. I have opted for the first option on Pattern 15.

Please find those here, correct me if I have missed something.

[MM..1]

image don’t show BOOT_LOCK and with this setup you always boot to system bootrom...

[Kamil Duljas]

Have you valid settings of UART connection? 9600 baudrate and parity even? Power from UART also connected?

[newbie_stm32]

Hi, @kamil Duljas​ I have ensured the proper connection and those are as follows

USB to UART ----> NUCLUEO-G491RE

--------------------------------------------------------

TX -----> PA10 (CN10 pin 33)

RX -----> PA9 (CN10 pin 21)

5V -----> E5V (CN7 pin 6) with JP5 jumper position set to E5V

GND -----> GND (CN7 pin 22)

Please find this

[Kamil Duljas]

How does your usb<->uart look like? It works with 5V or 3.3V? MY UART have jumper 3,3<->5V.

When I used STM32CubeProgrammer and UART I choosed 3.3V.

[newbie_stm32]

Hi, @Kamil Duljas​ same here. It comes with a jumper to choose between 3.3V and 5V. I have connected it to 3.3V and the remaining 5V connection was fed to E5V on the Nucleo board.

[Kamil Duljas]

I think about this .... First at all, try enter to boot mode using jumper instead jump from program. We exclude errors in code

[newbie_stm32]

Will try this out

[Kamil Duljas]

ttyACM0 is the only one USB on list?

[newbie_stm32]

Yes

[Kamil Duljas]

1. Additional tip: Add HAL_DeInit(); after HAL_RCC_DeInit();

[Kamil Duljas]

@newbie_stm32​  Some success?

Look at my settings:

You have simmilar board. try use jumper to connect. My result:

[newbie_stm32]

Hi @Kamil Duljas​, it did work for me. But when I tried it one more time, I got the same error message as shown before. I can assure you that connecting the BOOT0 pin to 3V3 and pressing RESET is keeping the MCU in the boot from system memory as there is blink code flashed to MCU with which after pressing RESET is not executing.

PS: I flashed using the system bootloader and immediately after that without disconnecting BOOT0 pressed RESET. After which I am not able to flash again using the system bootloader.

[Kamil Duljas]

Show me your connections

[newbie_stm32]

Here it is

[newbie_stm32]

Can we achieve the same using Open Bootloader?

[Kamil Duljas]

I don't know. I didn't use open bootloader. Could you show me your bootloader code now?​

[newbie_stm32]

Hi @Kamil Duljas​, Open Bootloader is an open project by ST and it can be found in the STM32CubeIDE > Target Selection >> Example Project >> OpenBootloader for NUCLEO-G491RE.

I am using it with no modification.