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STM32F429IIT6 stuck on bootloader

YKuo.1
Associate II

‎2023-02-06 07:07 PM

Hi,

 

I'm using STM32F429 to build a prototype. I found my board couldn't enter the USB bootloader mode. What I found was:

 

  1. Connect Boot0 to 3.3V via 100k ohm resistor, no pull down on Boot0. The MCU could enter USB bootloader mode properly. I can see a USB bootloader in the device manager (windows)
  2. Connect Boo0 to 3.3V via 1k ohm resistor, and add 100k pull down on Boot0. The MCU is stuck in a state where the USB bootloader is not enumerated on a machine.

 

I couldn't really figure out the difference between these. Any thoughts?

The issue was the BOOT1 pin is not terminated properly.  

Thanks,

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