Le samedi 4 ao?t 2007, Robert Brijder a ?crit?: > Hi Leandro, > > Sorry for the very late reaction. I do have some information for you > which may help. > > Look at the site http://zub.fei.tuke.sk/primax/ of Peter Popovec. > It contains a sane backend for the E3 ASIC, which our scanners have. > The only thing lacking in this backend is that it is for parallel port > scanners and not for USB. Luckily, the chip which does the bridging of > parallel port over USB is well known, it is the GeneSys Logic GL640. > There are many duplicate implementations of this USB bridge already in > the SANE backends, it appears to reside in at least 3 backends: > genesys, canon630u, and u12. So I guess it wouldn't be hard to > implement this in your sane backend. BTW: Does anybody know, Is there > a good reason for implementing this chip this many times? >
Where is there an USB bridge in the genesys backend ? For the 2 others, I don't know. But you have two implementation where you can choose the best one. And may be separate it into a library to use for your future backend, and that maybe would let refactor the two other. > It seems the modifications are mostly necessary in the port.c file (of > the sane backend of Peter Popovec) to get it working. I guess there > should be a USB version for the following functions. > > epp_off(); > epp_read(); > epp_read_one(); > epp_write(); > epp_write_one(); > switcher_online (); > switcher_offline (); > > The first five are not that hard I think, but I do not really have a > clue yet how to do the last two functions. > > If we can get USB support working, at least 6 new devices would be > supported. This would be nice. I contacted Peter Popovec, but since he > does not have such a USB scanner he would rather not implemented this > himself. > > I guess I answered your first question: we should edit the backend of > Peter Popovec. The second question: I don't know if it is possible to > damage the scanner. The third question: the backend of Peter Popovec > does not seem to have any licencing issues, this in contrast to the > viceo backend. > > All the best, > Robert > Regards, Stef