[sane-devel] help for write back-end

[m. allan noah]

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attached is a perl script i wrote, it only works with benoit's usb 
sniffer, not the usbsnoopy or snoopypro that you get from source forge.

allan

On Tue, 15 Feb 2005, Bertrik Sikken wrote:

> corwin wrote:
>> Hi,
>> 
>> I have a CanoScan 3200F (Product Id : 2216) and this scanner are not 
>> supported by sane.
>> But i'm very interresting for write a back end.
>> 
>> I use "usb snoopy log" for extract usb log under WinXP. And I had writing a 
>> perl script (based on awk Thomas Soumarmon's script) for genrate c code for 
>> replaying log-script under linux (debian, 2.6.9).
>> For the moment I reading libusb documentation and my first objective is to 
>> write a small program (sane independant) for activate the scanner.
>> 
>> But actually i'm completly lost into the log data and i don't know how to 
>> begin !!!
>
> Zip the logs and put them somewhere on your webpage (if you have one),
> then post a link to the mailing list. This way, other people with
> previous experience in decoding logs can try to see if there is
> something that matches an existing protocol.
>
>> So my questions :
>> 
>> Have you a methodology for extract information of data log ?
>
> I think that there is no fixed methodology, you just have to be a
> little creative.
>
> In my experience it helps to look for patterns in the log, like:
> * are there some USB transfers that always appear in some particular
>  order?
> * some scanners use a "register model", which means that initialising
>  the scanner consists of several write(register, data), which each
>  can consist of several USB transfers. See if this applies to your
>  scanner and find out the sequence to read or write a scanner register.
> * record lots of logs, where each time a single thing is changed, for
>  example record a log of starting the scan software, record a log for
>  a scan of 150 dpi, record a log for 300 dpi. If there is an option
>  to turn the scanner lamp on or off, record a log of this.
>
> For some scanners, the settings are sent using USB control transfers
> or rather small USB bulk transfers. Try to concentrate on these small
> transfers and don't bother too much yet about the bulky USB bulk
> transfers that contain the image data.
>
>> Where can I found script (perl, ..) for parsing and cleaning log data ?
>
> I don't know of a central place for log analysis scripts.
>
>> Have you trics ?
>> 
>> ludovic (corwin)
>> 
>> 
>> ps: I don't know the model of chips into the scanner and i don't open this 
>> because it is one plastic box and there are no visible screw...
>> pps : I'm very sorry for my poor english :(
>> 
>
> Kind regards,
> Bertrik
>
>
>

-- 
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