I would like to change the firmware on the ATMEGA16U2 on the Due board.
I know from the ATMEGA16U2's datasheet (http://www.atmel.com/Images/doc7799.pdf
) that pin 13 (_HWB) needs to be tied high while the ATMEGA16U2 is reset with it's pin 24 (_RESET) - which also needs to be tied high.
Resetting the ATMEGA16U2 is easy (from the ICSP1 header), however I can see from the Due schematic that pin 13 (_HWB) on the ATMEGA16U2 is tied to a 10K resistor (R18) that goes directly to ground
. This makes it pretty much impossible to put the ATMEGA16U2 into DFU mode unless one removes R18.
Anyone know of a convenient way to put the ATMEGA16U2 into DFU mode without removing the resistor R18? ... sadly i don't think there really is.