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Hello, I have started a project to implement a backend for the HP Photosmart S20xi. HP is very polite but I have got no answer from them when asking for some kind of support, guidance, API, etc. You can find the project at SourceForge: http://sourceforge.net/projects/hps20xi/ The project is still in the planning phase. No usable code exists yet; I have just coded some skeleton to the SANE API to test detection, etc. but it does not operate the scanner. Any help, hints, advise, USB snoop logs, or any other contribution are very welcome! I have found a strange behavior of this scanner: there is no USB traffic during operation (preview, scan, adjust, etc.). I have installed an USB snooper (Snoopy Pro) to watch the operation between the propietary software and the device. Once installed correctly I first see 6 configuration packets driven by the system software to configure the device. Then, when I start the acquisition program --either propietary or third-party, like VueScan--, I still see some USB traffic: three abort+reset pipes, and many bulk transfers. And then it quiets and I can see nothing more. However the scan works normally, I can operate it as if there were no snoop program but not a packet is sent over the USB bus (apparently). Whenever I restart the software, there is some more traffic but less than the first time. I have tried also with a VMWare Windows guest on top of a Linux machine and the same thing happens: there's no apparent USB activity from/to the scanner. I would like to know what is happening. Is the propietary driver bypassing the USB System software? Is it using another type of access (DMA, Shared memory)? Do they implement some anti-snoop catch or something? Have you found this behavior in other USB scanner (or other devices)? Can anybody with the same scanner confirm that this is a general characteristic of the S20xi? TIA. Cheers, ________________________________________________________________ Evilio Jose del Rio Silvan evi...@vodafone.es "... an inordinate fondness for Beetles" - J. B. S. Haldane --=-vzOvGar4p3hJBKWa27fs Content-Disposition: attachment; filename=hps20.desc Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; name=hps20.desc; charset=ISO-8859-1 ; ; SANE Backend specification file ; ; It's basically emacs-lisp --- so ";" indicates comment to end of line. ; All syntactic elements are keyword tokens, followed by a string or ; keyword argument, as specified. ; ; ":backend" *must* be specified. ; All other information is optional (but what good is the file without it?)= . ; ; See doc/descriptions.txt for details. :backend "hps20" ; name of backend :version "0.0.1" ; version of backend :status :alpha ; :alpha, :beta, :stable :new :yes ; Is the backend new to this SANE release= ? ; :yes or :no :manpage "sane-hps20" ; name of manpage (if it exists) :url "http://www.sourceforge.net/projects/hps20/"; ; backend's web page :devicetype :scanner ; start of a list of devices.... :mfg "Hewlett Packard" ; name a manufacturer :url "http://www.hp.com/"; ; manufacturer's URL :model "Photosmart S20xi (C5101A)"; name models for above-specified mfg. :status :alpha ; :alpha, :beta, :stable, :untested,=20 ; or :unsupported :interface "USB" ; interface type of the device: ; "SCSI", "USB", "Parport (EPP)", ; "Parport (SPP)", "Parport (ECP)", ; "Serial port" or "Proprietary". :comment "There is still no functionality in this backend. It's still in planning stage." --=-vzOvGar4p3hJBKWa27fs--
