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STM32U5G9BJYXQ Bootloader not responding to 0x7F

shubhenduatadben
Associate II

‎2025-12-28 10:40 PM

Hello,

    Developing a firmware to update the application via Bootloader over USART2. But, the STM32U5G9BJYXQ is not responding on 0x7F. The MCU is successfully starts from the NSBOOTADD1(0x0bf90000) on driving the BOOT0 pin high while deasserting the reset. The USB-USART tool is sending a proper 0x7F, verified by oscilloscope. Please point to what I might be missing.   

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MHoll.2
Senior III

‎2025-12-28 11:51 PM

I have very few information to help You:

- Did You try to program you Board (custom?) with the STM32CubeProgrammer (using USART2)?

- Do You use the right Pin's for USART2 (PA2, PA3)?

- Are You able to use USART2 in your Application?

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