[sane-devel] backend configuration error.

[m. allan noah]

try using the DBG macro in your backend to print some messages from within 
sane_init() and sane_get_devices().

then call:

SANE_DEBUG_BACKENDNAME=255 scanimage -L

Replace BACKENDNAME with name of your backend in all caps.

if you dont see your messages, then the dll backend may not be loading 
your backend. try using `strace scanimage -L` to be sure.

allan

On Wed, 26 Jul 2006, Rupesh Tarpara wrote:

> Hi,
>
> I have hand held image scanner which is a USB-ACM device and uses standard
> ACM driver (serial communication protocol over USB interface). The device
> file created by driver is /dev/input/ttyACM0 (virtual serial device).
>
> Following is the build procedure I have followed.
>
> I have downloaded "sane-backends 1.0.18" source and made the following
> changes to incorporate my device:
> 1. I have created a new backend source file for this device.
> 2. I have modified "sane-backends-1.0.18/configure.in" and
> "sane-backends-1.0.18/backend/Makefile.in" files to include my backend.
> 3. executed autoconf, ./configure, make and make install
> 4. all libraries were installed at "/usr/local/lib/sane"
>
> I modified the "/usr/local/etc/sane.d/dll.conf" file to include my backend
> name.
>
> I am using Xsane as frontend. When I run Xsane, it gives error message as
> "no devices available"
>
> -----------------------------------------------------------------------
> My queries,
>
> 1) are there any backend configuration steps which I might have skipped?
> 2) What is the procedure frontend follows when it is executed?
> 3) How does the communication happens (or initiates) between Frontend<---->
> backend <------> device?
> 4) What are the steps to be followed for new backend installation?
>
> -------------------------------------
>
> Additional information about OS and sane version I am using.
>
> I am using RedHat AS3 OS, following is the output of uname -a
> [root at mypc root]# uname -a
> Linux mypc.home.com 2.4.21-40.EL #1 Thu Feb 2 22:32:00 EST 2006 i686 i686
> i386 GNU/Linux
>
> [root at mypc root]# scanimage --version
> scanimage (sane-backends) 1.0.18; backend version 1.0.18
>
> Regards,
>
> Rupesh
>
>
>
>
>
> http://www.patni.com
> World-Wide Partnerships. World-Class Solutions.
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