[Arm-netbook] stm32f072 usb firmware

[Peter Bouda]

> keep the little piece of card, you need it!  it has the pin-out
> assignments.  so forget powering by the micro-usb, do this:
>
>   * flip the jumper from E5V to U5V
>   * cut off a random USB cable and strip down the black, red, white and green
>   * solder 5V (Red) to pin 6 of CN7
>   * solder GND (black) to pin 8 of CN7
>   * solder USB+ (green) to pin 12 (PA12) of CN10
>   * solder USB- (white) to pin 14 (PA11) of CN10
>
> then, plug it into a USB port of the development machine.  then, use a
> screwdriver to short BOOT0 (pin 7 of CN7) to E5V (pin 6 of CN7), and
> at the same time press and then release the reset button (B2).
>
>   if you then do "lsusb" you should see a device come up "DFU mode" in
> the description.  ta-daa, you can now upload a .bin file to it.  you
> do that with any of the libopencm3-examples, you must do "make bin".

hm, that did not work, unfortunately, I cannot get into the DFU mode 
somehow. It will just start into the mode that is described in the Quick 
start section of the manual. I found some forum posts where people 
suggest to solder resistors to PA11 and PA12... but that should not 
alter the start mode, right? Any ideas what I could have done wrong?

Best,
Peter