I have two AVR Minimus boards (version 1, with AT90USB162), both exhibiting the same behaviour.
They will both appear on the USB bus as DFU devices after a RESET/HWB button press. I can program them with FLIP/dfu-programmer under Linux, or so it appears. There are no error messages.
The problem is that after a reset back to the application nothing seems to be running, even a simple LED flasher (I've gone all the way back to using the example LED flasher HEX file from the Minimus website).
If I use my oscilloscope, there's no 16MHz clock on the external oscillator pins, in either DFU or application mode. This baffles me, because as far as I can tell from the literature the USB peripheral on the microcontroller needs that clock to function properly.
I have successfully used a Minimus board with DFU in the past, but that board is now encased in a project that I can't get to for comparison.
I have an ISP programmer, so I could set the CKSEL fuses to ensure that the external osc. is selected, but I was under the impression that I shouldn't have to do that.
Does anyone know what the issue here might be?