[sane-devel] Canoscan lide100 progress
mhirsch at media.mit.edu
Sat Oct 3 07:52:29 UTC 2009
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
Raw UsbSnoop output for a small scan:
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.
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