How to Enter boot loader in STM32H743BIT6 via USART1? pin BOOT0 is SET by SWITCH to "1" (VCC) (3.3V). the STM32H743BIT6 don't react to packets in USART1 from the STM32CubeProgrammer software.

[ZSade.1]

How to Enter boot loader in STM32H743BIT6 via USART1?

pin BOOT0 is SET by SWITCH to "1" (VCC) (3.3V).

the STM32H743BIT6 don't react to packets in USART1 from the STM32CubeProgrammer software.

[AScha.3]

> BOOT0 is SET by SWITCH to "1"

+ and then "reset " ?

+

how you connect to USART1 ?

[ZSade.1]

Hi AScha.3

USART1 Connected to the PC via ISO7321C ISOLATED TRANCEIVER IC via MAX14786E IC RS-422 Converter and connected to USB-COM422-PLUS2 Board via to USB to the PC.

using the STM software STM32CubeProgrammer.

the SW transmit the packet 0x7F twice, but the MCU don't reply.

attached PDF with the MCU schematics.

[MM..1]

Are you sure your USART configuration is: 8-bit, even parity and 1 Stop bit

[ZSade.1]

YES. I use USART1 with configuration on the PC: Boudrate: 115200 8bit EVEN parity 1 stop bit.

the MCU don't reply.

When i SET the BOOT0 pin in the MCU (pin 197) to 3.3V with the rise of the rise of VDD...

then the reset is released from "0" to "1", i try to use the STM software STM32CubeProgrammer.

i "see" the 0x7Fh packets in the RX pin of the MCU, but no response.

In my design i short J9 pin 1 to J9 pin 2 via jumper header before powering up the card.

please check the "BOOT0 PD FOR USART 1" section.

[MM..1]

If realy all your bridges transfer parity to MCU pins , then only one next condition

requred is add1 set properly.

[ZSade.1]

hi MM..1

please be more verbal.

On powerup the "BOOT0" (pin 197) is tied to VDD that is 3.3V ~ "1".

what is the next step to check?