How to to download the program to the STM32H743VGT6 via the serial port?

[llcc]

Hello, I'm trying to download the program to the STM32H743VGT6 via the serial port. I keep getting the following error when using STM32CubeProgrammer. Do you have any solutions?

[mƎALLEm]

Hello,

What USART interface and what GPIOs are you using?

Did you refer to the AN2606 section 56 STM32H74xxx/75xxx devices? not all the USARTs instances nor all the USART pins are available for the bootloader.

+ Boot pin = 1 before resetting the chip?

[llcc]

Hello, I used USART1 (PA9 and PA10). During connection, I held down both RST and BOOT0, then released RST first while keeping BOOT0 pressed. However, the aforementioned error consistently occurs.

[TDK]

What board is this?

Has this board ever worked?

Can you connect over SWD?

Nothing wrong with what you're doing, so the problem is elsewhere. Some possibilities:

• Hardware issue (e.g. bad power supply, not powered, miswired)
• Chip OB set up to ignore BOOT0.
• Some other bootloader interface is active and takes over before USART1

[llcc]

Yes, my board has worked before. I've always used ST-Link (SWD) to program it.

[llcc]

I try to use the DFU, but the error also consistently occurs.

[TDK]

> Yes, my board has worked before. I've always used ST-Link (SWD) to program it.

Can you connect with SWD?

What did you do prior to it not working?

[Tesla DeLorean]

You get one-shot to connect at each reset.

Also perhaps watch for noise on other interfaces, say like a GPS/GNSS or MODEM, that squawks at startup that the H7 might recognize as an attempt to connect.