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Getting into STM32F777 DFU mode

Question asked by sheldon johnson on May 27, 2017
Latest reply on Jun 6, 2017 by sheldon johnson

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


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,