FILES -------------------------------------------------------------------------

stm32lib/*

- all the (possibly consolidated) stm32 lib and usb example code

usb.c

- USB-specific hardware setup. Interrupts, clocks, etc. handling USB when

not "Attached". some low-level callbacks (low power mode, init, reset,

resume, etc).

usb_callbacks.c

- aka endpoints: handling data transfer when "Configured". calls out to

application specific callbacks (i.e. DFU).

usb_descriptor.c

- aka application descriptor; big static struct and callbacks for sending

the descriptor.

main.c

- main loop and calling any hardware init stuff. timing hacks for EEPROM

writes not to block usb interrupts. logic to handle 2 second timeout then

jump to user code.

hardware.c

- init routines to setup clocks, interrupts, also destructor functions.

does not include USB stuff. EEPROM read/write functions.

dfu.c

- mostly the giant FSM case switch, also some USB endpoint callbacks

TODO --------------------------------------------------------------------------

* pack the structs

* use sizeof() for usb application descriptor once structs are packed