-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Daniel Franke wrote: > On Wednesday 14 September 2005 21:41, Bertrik Sikken wrote: > > >>>On Tue, Sep 13, 2005 at 07:36:19PM +0200, Bertrik Sikken wrote: >>> >>>>The protocol is weird because it seems to implement some kind of >>>>'USB-over-USB', i.e. the data payload of the USB control packets >>>>looks like another USB control packet. The payload size never >>>>appears to exceed 8 bytes. >> >>[snip] >> >>The more I look at the usbsnoopy log, the more it looks similar >>to the hp5400 backend. This is probably good news because the >>hp5400 accepts a limited set of commands instead of dozens of >>writes to various registers. > > > > Bertrik, Henning, > > I managed to reliably pass some bytes between my test program and > the scanner. > > Already working: > * an answer to 0x1200 (version information of HP 5400 -- "SILITEKIElwood") > * re-read the last command (0xc500, same as HP 5400)
Cool. :D. > An observation: > Each command sequence has to be "terminated" by a null-byte, otherwise > communication gets out of sync. A command sequence looks like ... > - set up and write a "usb_ctrl_setup"-structure (defined in <usb.h>) > - read the answer > - send another '\0' to the device > > Does this look familiar? No, does not look familiar to me, sorry. > Are there any other known HP5400 command bytes I could give a try? Have a look at the #defines in backend/hp5400_internal.h from the sane-backends package. A very cool thing to start with, is to try to switch the scanner lamp on or off. As far as I can tell from the hp5400 backend, this can be done with command 0x1BXX. By the way: some scanners are not protected from moving the carriage beyond their physical limits. This may result in a loud (clicking) noise and possibly damage the scanner. So always stay close to the scanner to quickly yank the scanners' power cord in case that happens. All the best, Bertrik -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (MingW32) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFDLeA+ETD6mlrWxPURArtiAKCP3XPeERcRmb5c45QCWKSoGK+jvgCeMP1G 3s85hNC5ph5cbYOADIDH6rE= =My4B -----END PGP SIGNATURE-----
