<html><head></head><body><div dir="auto">Hi all,<br><br>there is a "logic analyzer" orginally based on a cyprus semi USB-I/O, and now further developped into better hardware, called salae.<br>And there is the "friendly" chinese copy cat, that provides you with a clone HW for a fraction of the original cost. Look at ebay or alibaba you should find a good clone around 80USD.<br>The small device is called salae, and people hack with it.<br>E.G. reading out the key of windows bitlocker from a tpm while booting. :-)<br><br>Here you find a USB sniffer that I did not test, but would give a try.<br><a href="https://github.com/saleae/usb-analyzer">https://github.com/saleae/usb-analyzer</a><br><br>Have fun.</div><br><br><div class="gmail_quote"><div dir="auto">On September 4, 2024 3:27:49 PM GMT+02:00, Ove Laurum <laurum.tech@gmail.com> wrote:</div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div dir="ltr">Hello and thanks for your responses.<div><br></div><div>The effort does not dissuade me, it will have to take the time it takes, in the meantime I will just have to retain a windows VM for using the scanner.<br><div><br></div><div>Luja, Yes, I did Open up the scanner, but all chips were covered with stickers and pads, so I have not yet tried to take them off and read the chips. </div><div>The one visible number "MBA691 100/103 MP 00485509*103*AB1501160083" looks like it's referring to the Circuit board.</div><div>I did not see anything looking like a tty/rs232 port, as you can see in the image of the circuit board from the original email attachment.<br></div><div>Well, there is what looks like a place to solder in a 2*4 connector in one place, hard to tell what the purpose may be. It's just called J6.</div><div>But before I do any of that, I have been looking for some wiki that has a list of scanners and their chips/circuits listed, or where would I find a list to compare with?</div><div>Also fyi, the scanner is at least 10 years old but works fine on Windows 10, I have not tried Windows 11.</div><div><br></div><div>Ralph, I was trying to find where the source code is, GIT hub? or somewhere else? so that I can take a look at the code for some examples of backends. I assume it's written in C.<br></div><div>I found <a href="https://www.commandlinux.com/man-page/man-page/man-page/man5/sane-avision.5.html">https://www.commandlinux.com/man-page/man-page/man-page/man5/sane-avision.5.html</a> </div><div>So I will start there trying to figure out how to read logs for the scanner as per your suggestion.</div><div><br></div><div>The other thing I will have to do is to trace a successful scan operation on Windows.</div><div><div>My goto tracer would be wireshark, I know I can trace USB ports in Linux so I assume that is possible on Windows as well to get a trace of successful scanning.</div><div>But is there a better tool to trace the USB traffic on Windows for the purpose of establishing some form of API?</div></div><div><br></div><div>Thanks again.</div><div><br></div><div>Ove</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 3 Sept 2024 at 19:02, Ralph Little <<a href="mailto:skelband@gmail.com">skelband@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">Hi,<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 2, 2024 at 6:38 AM Ove Laurum <<a href="mailto:laurum.tech@gmail.com" target="_blank">laurum.tech@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello.<div><br></div><div>I am new to sane but hope to find some guidance on how I can help adding this printer to sane supported devices.</div><div><br></div><div>I am trying to use a scanner "Avision AV50F plus" on Linux (Ubuntu).</div><div>I do not see it listed as a supported scanner by sane.</div><div>Also after installing xsane it is not recognised, see command line output at the end of the mail.</div><div>The scanner works fine on Windows with Avision driver and SW and Button Manager SW.</div><div>I have attached screenshots from Windows Device Manager.</div><div>I also attached a photo of the circuit board of the scanner as well as a pdf product sheet of the scanner.</div><div><br></div><div>I would be grateful for any advice on:</div><div>a: has anybody else tried, failed, succeeded in adding support, if so what is your experience?</div><div>b: what is the recommended process for me to follow?</div><div>c: how do I know if this can be added to an existing backend, or if I need to write a new backend.</div><div>d: any advice on how to trace the driver/scanner communication on windows to reverse engineer the protocol?</div><div></div><div><br></div></div></blockquote><div><br></div><div>Many Avision devices use a specific prococol supported by the avision backend.</div><div>It might be worthwhile adding the identity of this scanner to the backend and having a look at the diagnostic output set using the SANE_DEBUG_AVISION environmental variable set to some highish number (e.g. 50). Early on, IIRC, the backend queries the device for capabilities. If the device gives some kind of proper response to this request then that would be the best place to start.</div><div><br></div><div>But it is not for the faint of heart.</div><div><br></div><div>Cheers,</div><div>Ralph<br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div></div><div>Looking forward to contributing to sane.</div><div>Kind regards </div><div>Ove.</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div>Command Line Output:</div><div><br></div><div>$ sudo sane-find-scanner<br><br> # sane-find-scanner will now attempt to detect your scanner. If the<br> # result is different from what you expected, first make sure your<br> # scanner is powered up and properly connected to your computer.<br><br> # No SCSI scanners found. If you expected something different, make sure that<br> # you have loaded a kernel SCSI driver for your SCSI adapter.<br><br>found possible USB scanner (vendor=0x04a9 [Canon], product=0x190f [CanoScan], chip=GL848+) at libusb:001:004<br>found possible USB scanner (vendor=0x0638 [AVISION], product=0x2b6a [AV50F Plus]) at libusb:001:003<br> # Your USB scanner was (probably) detected. It may or may not be supported by<br> # SANE. Try scanimage -L and read the backend's manpage.<br><br> # Not checking for parallel port scanners.<br><br> # Most Scanners connected to the parallel port or other proprietary ports<br> # can't be detected by this program.<br><br></div><div>$ sudo scanimage -L<br>device `genesys:libusb:001:004' is a Canon LiDE 220 flatbed scanner<br><br></div><div>$ lsusb<br>Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub<br>Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU Tablet<br>Bus 001 Device 003: ID 0638:2b6a Avision, Inc. AV50F Plus<br>Bus 001 Device 004: ID 04a9:190f Canon, Inc. CanoScan LiDE 220<br>Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub<br></div></div>
</blockquote></div></div>
</blockquote></div>
</blockquote></div><div dir="auto"><div class='k9mail-signature'>-- <br>Phone numbers: <br>+49 176 79038607 [DE]<br>+359 899159711 [BG]<br><br>-- <br>"They who can give up essential liberty to obtain a little temporary<br>safety, deserve neither liberty nor safety." Benjamin Franklin (1775)</div></div></body></html>