How to enter bootloader in system memory using the Nucleo-F429ZI

[HBusi.1]

Hi all !

I want to enter the bootloader in system memory using the Nucleo-F429ZI but without success until now.

As I understood, the only thing to do to enter bootloader at reset is driving pin BOOT0 High and BOOT1 Low.

What I have tried is :

• solder the SB152 in order to have BOOT1 pin pulled down
• power the board, user leds start blinking (standard FW)
• connect +3V3 and BOOT0 pin : the user leds stop blinking (I don't get why...)
• reset the board, the user leds don't blink (but I'm not sure I'm in the bootloader though)
• disconnect +3V3 and BOOT0 pin
• use STM32CubeProgrammer to open an UART connection on the ST Link COM Port (115200 br with even parity) : failure to open connection - time out !

Is there something I'm missing ?

Any help much appreciated !

[MM..1]

You cant use ST Link COM Port

Read AN2606 p172

[HBusi.1 · Accepted solution]

Hi,

Thanks for your quick reply ! It helped me a lot to find the answer.

In case it might help anyone facing the same question, the details are :

• looking at the document AN2606 p 172, you can see that bootloader USART3 is only accessible through the pins PB10/11 or PC10/11

• Meanwhile in the document UM1974 of the nucleo board, you can see page 26 that the virtual com port of the embedded ST-Link is connected to USART3 through the pins PD8/9