[sane-devel] Need help analyzing USBSnoopy logs for Microtek Scanmaker 5600

Mon, 18 Oct 2004 09:03:55 -0700 (PDT)

Some good news on the Microtek Scanmaker 5600 front -
with Karsten's and Bertrik's help, I have been able to
decode the usb protocol for setting/reading status,
setting scan window and other scan parameters etc.
Using javax-usb, I have been able to read image data
through bulk transfer. I will start developing the
sane backend very soon. As a template, I plan to use
the sm3600 usb code.

I have a couple of questions regarding sane
integration:
1. Once I have the raw image data, what do I do with
it?
2. How do I process the raw image data to create
usable image?
3. Is there any common core sane code to handle the
raw image data like saving it in different formats?

Thanks!

Susheel

--- Susheel Yadav <sushyad@yahoo.com> wrote:

> Karsten,
> Please go ahead and send me the documents.
> 
> Bertrik,
> Your analysis is right on! So all that huge chunk of
> data in the beginning is just for calibration, and
> data the towards the end is the image data.
> 
> I will play around with those parameters and try to
> get some image. After that I will need to know how
> to
> use the calibration data.
> 
> Thanks a lot guys!
> 
> --- Karsten Festag <karsten.festag@gmx.de> wrote:
> 
> > Hi,
> > 
> > I just looked curiously on the data and I think
> > there are some similarities 
> > between the scsi based scanners driven by the
> > microtek2 backend and the 5600:
> > 
> > command 0x24 is used to setup the scan window,
> > probably first a fixed window 
> > for calibration and second the actual scan window.
> > 
> > command 0x28 0xnn 0x80 reads image information
> > (width, height, bytes)
> > command 0x28 0xnn 0x81 reads system status (Lamps
> > on/off, buttons,) and 0x2a 
> > 0xnn 0x81 should set the status.
> > command 0x28 0xnn 0x82 reads scanner attributes
> > (resolution, width, heigt of 
> > the scan area.......)
> > 
> > Maybe a look at the microtek2 sources helps you. I
> > also have some (quite old) 
> > documentation but it may help. Tell me if I shall
> > send it to you (its an ugly 
> > MS Word file :-()
> > 
> > Regards,
> > 
> > Karsten
> > 
> > 
> > On Wednesday 15 September 2004 21:57, Susheel
> Yadav
> > wrote:
> > > Thanks a lot Bertrik for your analysis. I have
> > figured
> > > out some things - I have written those down in
> the
> > > last  link on the web page.
> > >
> > > *request=0x24 value=0x00 data=0x45 bytes
> > > The data transferred in this request did not
> > change
> > > even if I moved the scan area horizontally
> keeping
> > the
> > > size constant. This makes me think that maybe it
> > scans
> > > the whole row and the software clips the image
> > later.
> > > What do you think?
> > >
> > > *request=0x26 value=0x00 data=0xef00 bytes
> > > This happens before bulk transfers, and the data
> > > returned in Nth step is sent to the scanner in
> the
> > > (N+1)th request.
> > >
> > > *The bulk transfer is followed by a small
> transfer
> > of
> > > 0x40 bytes. This returns 0x10 bytes. The last
> 0x30
> > > bytes sent always remain same, and the first
> 0x10
> > > bytes are the ones that were returned from the
> > > previous cycle. Could this signify the position
> of
> > the
> > > next chunk of data?
> > >
> > > *request=0x28, 0x40, 0x83, 0x12 repeat and I
> think
> > > they are status check. The windows driver has a
> > > scanner detector utility which when turned on,
> > keeps
> > > sending those packets.
> > >
> > > *request=0x28 value=0x83
> > > This request gets the data that is send back in
> > some
> > > 0x40 0x2a 0x81 requests.
> > >
> > > *request=0x29 seems to denote the end of
> transfer
> > > since there is no more bulk data after that.
> > >
> > > --- Bertrik Sikken <bertrik@zonnet.nl> wrote:
> > > > Susheel Yadav wrote:
> > > > > Hi,
> > > > > I am trying to write the linux driver for
> > Microtek
> > > > > Scanmaker 5600 scanner. I used USBSnoopy to
> > > >
> > > > generate
> > > >
> > > > > these logs from VMWare/Win2k. I have
> filtered
> > out
> > > >
> > > > the
> > > >
> > > > > big bulk transfers. The log files are still
> in
> > > >
> > > > ~200KB
> > > >
> > > > > range. I am providing a link below with the
> > log
> > > >
> > > > files.
> > > >
> > > > > I have made some progress in identifying the
> > > >
> > > > status
> > > >
> > > > > check packets, and some pattern in the bulk
> > > >
> > > > transfers,
> > > >
> > > > > but I have no idea what those medium sized
> > control
> > > > > packets mean. I would appreciate any help.
> > > > >
> > > > > http://blanca.homelinux.com/usblogs/
> > > > >
> > > > > Thank you very much!
> > > >
> > > > What medium sized control packets do you mean?
> > > >
> > > >
> > > > I looked a bit at the logs and noticed 10
> unique
> > > > patterns:
> > > >
> > > > * request=0x12, value=0x00: read version info?
> > > > The data returned by this transfer contains
> the
> > > > strings
> > > > "ScanMaker 5600  1.30"
> > > > "NowV0.10NewV0.10"
> > > >
> > > > * request=0x24, value=0x00: write 0x45 bytes
> of
> > scan
> > > > settings?
> > > > This transfer contains numbers like 1200, 600,
> > 300,
> > > > which are likely
> > > > DPI or LPI resolutions. I think that scan area
> > is
> > > > also coded in this
> > > > transfer. It noticed this transfer happens
> twice
> > > > (once for calibration,
> > > > then once for the actual scan?)
> > > >
> > > > * request=0x26, value=0x00: prepare bulk read
> > (index
> > > > = length)
> > > > This transfer always seems to happen just
> before
> > a
> > > > bulk read
> > > >
> > > > * request=0x28, value=0x80: get a bunch of
> bytes
> > > > (don't know what)
> > > >
> > > > * request=0x28, value=0x81: read some 9-byte
> > buffer
> > > >
> > > > * request=0x28, value=0x82: read scan
> > capabilities?
> > > > This transfer also has typical DPI numbers,
> but
> > > > always seem to be
> > > > the same (not always same length though)
> > > >
> > > > * request=0x28, value=0x83: read status byte?
> > > > (00 = ready, 08 = not ready?)
> > > >
> > > > * request=0x29, value=0x2101: prepare bulk
> write
> 
=== message truncated ===

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