[sane-devel] Canon MF8330

[Teemu Suikki]

Still one problem, ADF only works for one page. The problem is that in
windows all ADF pages are scanned inside single session. Sane does
abort_session after first page, then fails with EBUSY in the next
start_session...  The scanner is busy because it is feeding the rest
of the pages, it accepts a new session only after it has finished
feeding the pages.

I tried fixing this by checking ADF status and only do abort_session()
if ADF has no paper, and also ignore start_session return code. This
works very well with scanimage, batch mode scans everything correctly
and even without batch you can do single page scans..

But Ubuntu's "Simple Scan" utility fails after first scanned page..
Don't know why.

--
Teemu

2011/12/3 Teemu Suikki <zuikkis at gmail.com>:
> Ok,
>
> sorry for talking to myself. :)
>
> It works now 100%. All resolutions work etc.
>
> The problem was that in pixma_imageclass.c there is this define:
>
> #define IMAGE_BLOCK_SIZE (0xffff)
>
> MF8330 sends 0x1fff8 sized blocks, they don't fit. I increased
> IMAGE_BLOCK_SIZE to 0x1fff and it's ok now. Should this be device
> dependant?
>
> There's the current pixma_imageclass.c and a diff to the latest git
> version in http://zuik.org/sane/
>
> If anyone is listening and interested, you can add my changes to git..
>
> --
> Teemu
>
>
>
>
> 2011/12/3 Teemu Suikki <zuikkis at gmail.com>:
>> Hmm, no. I can scan any part of the paper, as long as the scan size is
>> so small that the data fits under 65536 bytes.  Anything higher
>> fails..
>>
>> I don't understand what happens, it all looks fine in the logs, until this:
>>
>> [pixma] read_image():reader task closed the pipe:0 bytes received,
>> 1681920 bytes expected
>> scanimage: sane_read: Error during device I/O
>>
>> This happens exactly when received data hits the 65536 bytes mark..
>>
>> Do other devices use >64k chunk sizes? is it possible that there is a
>> 16bit counter used somewhere where it shouldn't..
>>
>> --
>> Teemu
>>
>>
>> 2011/12/3 Teemu Suikki <zuikkis at gmail.com>:
>>> Hi,
>>>
>>> I tried scanning smaller area, with
>>>
>>> SANE_DEBUG_PIXMA=25 scanimage -l100 -t100 -x50 -y50  --format=tiff
>>>>test.tif 2>debug
>>>
>>> And surprisingly it worked! :) Perfect scan. So probably the "full
>>> page" settings are somehow out of bounds, I need to figure that out.
>>>
>>> The scanner was "stuck" for maybe 30 seconds after the scan, saying
>>> "scanning" even when the scan had already competed. I noticed that
>>> windows driver always sends cmd_abort_session after scanning; adding
>>> this fixed it on Sane as well.
>>>
>>> Anyway, looks very promising now. I updated http://zuik.org/sane/ with
>>> the latest files.
>>>
>>> --
>>> Teemu
>>>
>>> 2011/12/3 Teemu Suikki <zuikkis at gmail.com>:
>>>> I now started digging this myself with UsbSnoop. MF8330 really is
>>>> using this 0xd460 instead of 0xd420, as data transfer command.. I
>>>> couldn't find any other big differences.
>>>>
>>>> I modified pixma_imageclass.c to use d460.. it almost seems to work,
>>>> but there isn't enough data coming from the scanner. For full A4 scan
>>>> at 75dpi, scanner only sends about 65536bytes of data total.. After
>>>> that, scanimage reports:
>>>>
>>>> [pixma] read_image():reader task closed the pipe:0 bytes received,
>>>> 1683840 bytes expected
>>>> scanimage: sane_read: Error during device I/O
>>>>
>>>> Why does it say 0 bytes, it's actually 65536?
>>>>
>>>> Also in the log there are many "empty"  data packets, that are not
>>>> there on windows log:
>>>>
>>>> [pixma] OUT  T=4.841 len=11
>>>> [pixma]  00000000:d4 60 00 00 00 00 00 00  04 00 06
>>>> [pixma]
>>>> [pixma] IN   T=4.845 len=8
>>>> [pixma]  00000000:06 06 00 00 00 00 00 00
>>>>
>>>>
>>>> I have the UsbSnoop.log, sane debug output and the modified source available at:
>>>> http://zuik.org/sane/
>>>>
>>>> --
>>>> Teemu Suikki
>>>> http://www.ksportfinland.com
>>>> http://www.z-power.fi/
>>>
>>>
>>>
>>> --
>>> Teemu Suikki
>>> http://www.ksportfinland.com
>>> http://www.z-power.fi/
>>
>>
>>
>> --
>> Teemu Suikki
>> http://www.ksportfinland.com
>> http://www.z-power.fi/
>
>
>
> --
> Teemu Suikki
> http://www.ksportfinland.com
> http://www.z-power.fi/



-- 
Teemu Suikki
http://www.ksportfinland.com
http://www.z-power.fi/