How should i use UART to download firm? the mcu is STM32F401VBH6,and i have sent the boot0=0. the download tool is stm32cube programmer.

[Mike_ST]

Hello,

I think that BOOT0 should be 1 to allow download with UART.

[Pwang.21]

The booto now is 1,but it still show this error:

[Mike_ST]

What error ?

[Pwang.21]

The below:

[Tesla DeLorean]

Has the chip/board been test and programmed via JTAG pins?

Which UARTS and pins do you have connected, and too what?

Are other devices connected that might be signalling on other pins?​

[Mike_ST]

Please check that you are following Application note 2606:

For STM32F401xB:

• Boot0(pin) = 1 and Boot1(pin) = 0
• USART1 or USART2
• 8-bits, even parity and 1 Stop bit

[Pwang.21]

My configuration as below:

Boot0=1,boot1 not configure

USART1

8-bits, even parity and 1 Stop bit

could you help to confirm boot1=0 is necessary?

[Mike_ST]

This is what section 27.1 of AN2606 is saying: "The STM32F401xB(C) bootloader is activated by applying pattern1"

If I remember well, if boot1 is pulled to 1, the MCU boots from RAM.