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.

[Kamil Duljas]

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

[newbie_stm32]

Hi, @mm..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.

[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

[Kamil Duljas]

ttyACM0 is the only one USB on list?

[newbie_stm32]

Yes