[sane-devel] backend in progress: canon i-sensys mf4570dn, 'mfnp' protocol

chrysn chrysn at fsfe.org
Sat Mar 5 18:29:47 UTC 2011

On Thu, Mar 03, 2011 at 10:42:47PM +0100, Louis Lagendijk wrote:
> Please post the output of sane-find-scanner with the scanner attached
> through USB. What chip is detected?

it reports:

found USB scanner (vendor=0x04a9 [Canon Inc], product=0x2736 [MF4570dn]) at libusb:002:010

it seems no chip is detected.

> Once we know if one of the existing
> backends can be made to work over USB, I can have look at integrating
> the MFNP stuff (which looks like USB over TCP!) in that backend. The
> mfnp looks similar to BJBP, except for the last few packets, but that
> may be an extension to read the buttons.

i don't think it's buttons (as nothing scan-related has yet shown any
reaction to pressing buttons), but could be anything similar.

> > [ could a python backend be used? ]
> This does not look a very attractive route for integration in Sane to
> me. Lets first see if sane-find-scanner recognizes the scanner when
> attached over USB. It is quite likely that a well-known chipset is used
> that is already supported by one of the existing backends. If so, and
> the backend is patched to work with your scanner, we can look at USB
> over TCP.

is there a way to forcibly try the existing implementations on the
device (without its chipset being known)?


There's always a bigger fish.
  -- Qui-Gon Jinn
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