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
Hi

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 ?

Outcomes