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/
