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

[Susheel Yadav]

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
> (index=length=20400)
> Not sure yet what is written here, looks like 16-bit
> data.
> Could be calibration data.
> 
> * request=0x2A, value=0x81: write some 9-byte buffer
> Same buffer as read by request=0x28,value=0x81
> 
> * request=0x40, value=0x00: read scanner status
> This transfer seems to happen after about any other
> transfer.
> 
> 
> I think a good transfer to concentrate on is the one
> with request=0x24.
> This one seems to indicate scan settings, so try out
> some different
> scan area's, resolutions, etc. and see if you can
> spot any log changes
> in this transfer that match with your settings.
> The stuff written to the scanner using the transfer
> with request=0x29
> could be calibration data. I think that in initial
> tests you can get
> away with just writing some constant data like 0xFF.
> 
> Hope this helps (and that I'm not telling you
> anything you knew
> already)
> 
> Bertrik
> 
> 
> 
> 
> 
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