AnsweredAssumed Answered

jumping to the bootloader via software does not permit dfu mode

Question asked by mangan.john on May 14, 2014
Latest reply on Jun 6, 2014 by Charles Miller

I have an STM32F4 board. When I connect a jumper to f14 and start up with a USB cable connected, the device manager of the connected PC sees a DFU Device connected and I can perform a flash upgrade over USB.
When I remove the jumper, and from my application code, jump to address 0x1FFF0004, the device does get to the bootloader, however the Device Manager on the PC reports Unknown Device.  I know that I am in the bootloader because i can upgrade over the serial comms.
The question is, what is the jumper doing for me that jumping to the bootloader from my application isnt ?