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TallGUY
TallGUY
Associate II
May 27, 2017
Solved

Getting into STM32F777 DFU mode

  • May 27, 2017
  • 1 reply
  • 785 views
Posted on May 27, 2017 at 04:09

Is there anything I am missing while trying to get my STM32F777 chip into DFU mode?

0690X000006077mQAA.png

I have a 25 MHZ OSC (HSE), NRST is pulled high with a 10K resister and BOOT0(pin138) is pulled low with a switch to pull it high on reset/power on. 

The chip is totally blank never been programmed, do I need to set any of the option bits or are the defaults correct? 

How does the chip detect that USB has been connected; the VBUS pin, the ID pin, or just USB communication?

I would appreciate any help, thanks,

Sheldon 

    This topic has been closed for replies.
    Best answer by TallGUY
    Posted on June 06, 2017 at 05:02

    So it was a USB impedance problem. thanks for the help

    1 reply

    TallGUY
    TallGUYAuthorBest answer
    Associate II
    June 6, 2017
    Posted on June 06, 2017 at 05:02

    So it was a USB impedance problem. thanks for the help

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