[sane-devel] Canon DR-2020U incompatible with canon_dr

[m. allan noah]

On Mon, Apr 19, 2010 at 10:33 AM, Fabian Eichstädt <f.eichstaedt at fabz.de> wrote:
> Hi all!
> We recently aquired a Canon DR-2020U scanner and I tried to test it
> with a recent sane git-snapshot. It compiled without problems and
> I tried to use it with the canon_dr backend. This failed.
> Allan Noah told me that this model uses a very different control method
> than the other "DR" scanners and thus the canon_dr backend cannot work.
>
> I made a scan with Windows XP and logged the USB Commands with USBSnoop.
> This logfile is available for download here (ca. 4.3 MB):
> http://dl.dropbox.com/u/3879521/CANON-DR2020U_UsbSnoop.log.bz2
>
> Maybe this is helpful for somebody interested in creating a suitable backend
> for this scanner. I would be glad to be able to use this scanner with Linux.

Looks like mostly alot of 1 or 2 byte control transfers, with bulk for
the image data. Perhaps one of the genesys authors could look at it?

allan
-- 
"The truth is an offense, but not a sin"