[sane-devel] Sane backend for an intraoral X ray camera

[m. allan noah]

On Thu, Dec 17, 2020 at 8:11 PM Mayuresh <mayuresh at acm.org> wrote:
>
> On Thu, Dec 17, 2020 at 07:42:06AM -0500, m. allan noah wrote:
> > I took a quick look at the protocol and did not recognize it.
>
> > Perhaps someone else will recognize the protocol.
>
> If that is not recognized, what is the way out? Just play back as it is by
> hard coding the values?
>

If the windows driver gives you some options, then you make a series
of logs each with a different combination of settings. Then compare
the logs to determine what changes. Anything that remains, you may
have to hard code.

> If I were to do that what tools are suitable? I tried python libusb once,
> but could not mimic even 1 step, was getting input/output error or timeout
> error.

If you want to use sane, you copy a backend that seems readable to
you, and pound it into shape. For instance, the cardscan backend is
small, and uses USB.

> Also, the 'END POINT' numbers reported by wireshark (by double clicking on
> any event) aren't matching those reported by lsusb or usbmon. So when
> mimicing it's unclear which end point numbers to trust.

Oddly, the in vs out end points will have a difference in the highest
bit (eg, 0x01 vs 0x81), and some logging programs don't show that
distinction. I am not sure if that is what you are seeing.

allan
-- 
"well, I stand up next to a mountain- and I chop it down with the edge
of my hand"