[sane-devel] Canoscan lide100 progress

glitchiker glitchiker at gmail.com
Wed Dec 16 03:23:52 UTC 2009

I just purchased a Canon Lide 100 scanner and was curious how the drivers
were coming along for it.  Just touching base ;).

stef-22 wrote:
> Le samedi 3 octobre 2009 09:52:29 Matt Hirsch, vous avez écrit :
>> I thought I'd update the list on my progress on the lide 100, in case
>> anyone has any suggestions or comments that might be helpful.
>> The gl847 (chip in the lide 100) has a somewhat different protocol than
>> the 841, specifically it uses single urb register reads (two urbs are
>> usually required in the 841 protocol) and it handles bulk reads/writes a
>> little differently. I've modified Pierre's script to parse the UsbSnoop
>> output for the lide 100.
>> Modified script:
>> http://web.media.mit.edu/~mhirsch/lide100/usbsnoop-gl847.pl Original:
>> http://pirsoft-dsl-dropzone.de/
>> Raw UsbSnoop output for a small scan:
>> http://web.media.mit.edu/~mhirsch/lide100/UsbSnoop-3-scan.log.bz2
>> parsed output:
>> http://web.media.mit.edu/~mhirsch/lide100/gl847-3-scan.out.bz2
>> There is no datasheet available for the gl847, but based on the usbsnoop
>> log of the communication with the scanner it appears closest to the
>> gl846, which is documented here: http://www.datasheetdir.com/GL846+USB
>> A driver for this chip seems like it would entail adding a
>> backend/genesys_gl847.c and minor modifications to backend/genesys.c
>> backend/genesys_low.h backend/genesys_devices.c (new CCD, GPO, and
>> probably AFE and motor). Does this sound reasonable? I'm not familiar
>> with SANE development at all.
>> Thanks very much to Allan for pointers in the right direction.
>> Matt
> 	Hello,
> 	adding a backend/genesys_gl847.c file to handle this new asic seems also
> the 
> best choice to me. I'd also personally be inclined to add a genesys_low.c
> that 
> would contain low level access to the chips instead of having them in 
> genesys.c . This way  genesys.c would only contain high level functions
> close 
> the API level, while other files would be closer to the hardware.
> 	When do you think you'll have some patch ready to send for testing/review
> ?
> Regards,
> 	Stef
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