When we reset the hub, the hub will actively drvie the PRTPWR signal of
the SITMRACE12 low, resulting in the SAM3 being shut off. If we want to
"survive" this, we need to set the OVERRIDE before we go into reset.
Right now, we never release the signal again, keeping ST12 enabled
permanently, which is of course not what we want in general.
Depending on which features (and thus USB configurations) are included
in the firmware, we need to re-define the ordering of the configuration
numbers, as the Atmel USBD driver simply assumes that configurations are
numbered 1..N without any gaps in the sequence.
... among those is a rotor (\|/-) that is printed by the main loop,
so one can observe if the main loop is still executing or the system
is somehow stuck.
When the timeout was too small, the main function would infinitely
loop around, restarting the board and waiting for the USB interface
to get configured. But since configuration seems to take more than
one second, it rarely succeeded.
Increasing the timeout makes the USB configuration finish in the
first try.
* Implemented configure, init, exit functions:
When a configuration is changed, interrupts for reset pins
should be disabled
* Moved variables shared between code files to simtrace.h
