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Fri Apr 8 14:35:32 EDT 2011

USB low-level

Following _usb.f : making sense of the different request dispatch
levels.  Each level is one decision down the tree, following only the
first ones.

level 0: dispatch UIR interrupts: error, soframe, idle, activity,
stall, reset and transaction.

level 1: transaction:
   - IN
   - OUT
   - SETUP

level 2: SETUP

   - 0 GET_STATUS
   - 1 CLEAR_STATUS
   - 3 SET_FEATURE
   - 5 SET_ADDRESS
   - 6 GET_DESCRIPTOR
   - 7 SET_DESCRIPTOR
   - 8 GET_CONFIGURATION
   - 9 SET_CONFIGURATION
   - A GET_INTERFACE
   - B SET_INTERFACE

level 3: GET_DESCRIPTOR
   - 1 DEVICE
   - 2 CONFIGURATION
   - 3 STRING
   - 4 INTERFACE
   - 5 ENDPOINT


What about this: 

  - generate macros for all code that simply returns a fixed reply
    packet.

  - use long names:

    SETUP.GET_DESCRIPTOR.DEVICE

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