# Work started on FB630U

From: Simon Heywood (simon.heywood@physics.org)
Date: Sat Jun 09 2001 - 06:43:24 PDT

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  Now I've finished my final exams at the university of Warwick I can devote
  some time to this project. I hope you can help me get started - I've got
  about 16 weeks to do this before I start work full time.

  Firstly, I've had a little difficulty with the SniffUSB utility. Since
  there's no documentation, I'm purely guessing what to do. Sniff USB shows
  two devices in its window - the root hub and my scanner - and I've
  installed a sniffer on both (is that correct ?).

  I have produced a few logs with this setup, obtaining identical output for
  plugging in the scanner on a clean rebooted system, waiting a few seconds,
  then unplugging it again. This output can be found at:

  http://www.warwick.ac.uk/~phucq/scanner/usb-init-3.txt

  I also made a log by clicking the "replug" button whilst the scanner was
  selected in SniffUSB:

  http://www.warwick.ac.uk/~phucq/scanner/usb-init-2.txt

  Finally, I am using a test program (thoughtfully ripped from Vladimir's
  ct.c) to try to get some sense out of the scanner, with little success
  thus far:

  http://www.warwick.ac.uk/~phucq/scanner/canon-usb.c

  Now time for some questions!

  Which direction is which in the SniffUSB logs? I'm assuming that "going
  down" is PC to scanner and that "coming back" is scanner to PC, but I'm
  sure there's scope for confusion with the USB architecture.

  I'm assuming that the actual data sent/received is the line of hex numbers
  after "0000:" - is this all that gets sent? I've tried reproducing these
  codes by writing them to the scanner device and trying to read what gets
  sent back, but I've never heard back from the scanner.

  Of course, it doesn't help that the USB 1.1 docs are fairly inpenetrable
  to non-Intel people - I think we should send the Plain English Society
  posse round. ;-)

  TIA,

      --
        Simon Heywood <simon.heywood@physics.org>
        website: http://www.warwick.ac.uk/~phucq/
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