[sane-devel] Error: Canon Pixma MG7550 hangs

Troels Thomsen troels.pil.thomsen at gmail.com
Sun Jan 11 13:52:06 UTC 2015 

Martin,
ad 1)
I'm sorry I have no understanding of the protocol what so ever, and have
spent max ½ hour in the code, to see what the patches I was sent, did.
ad 2)
I agree , this IS strange ...
ad 3)
I agree , this IS strange ...
ad 4)
Frankly, you have so many strange phenomenons going on, so ... you could
try....
(not that this a satisfactory solution at all...)

At this point, I think I would try to test it on another computer, to see
if all these really strange phenomenons (e.g. 'enabling Ethernet on the
device, makes usb scanning work' ) somehow is related to hardware or the
Linux installation. Just to make sure....

Sorry, its not much help.

/Troels



2015-01-07 23:26 GMT+01:00 Martin <martin.gu at intergga.ch>:

> Troels
>
> I agree with you, we have to be careful on the test methodology.
> My knowledge in c is limited since I wrote my last c-program about 20 years
> ago. But I could try.
> But before trying to modify the source code I have some questions:
>
> 1) Did you analyze the USB-calls of the Canon-software on windows and
> compare
> them to the SANE-sequence? What is the meaning of the first sequece 55 53
> 42
> 43 F0 36 04 0B...?
>
> 2) What is the difference between scanimage and xsane? Is it only the
> timing?
>
> 3) What is the difference between xsane and the gimp plugin? Is it only the
> timing? Why does the gimp plugin only work after xsane?
>
> 4) Would it be worth while to make a few tests with the printer mode, i.e.
> to
> try to start xsane after printing?
>
> Martin
>
> > > If the scanner does not work on a USB port it is quite unlikely to work
> > > over the network: the bjnp network code just carries the USB exchange
> > > over IP.
> >
> > I mostly agree, though Rolf asks specifically for the USB trace, because
> > (as I understood) it differs slightly from the IP traces I had already
> > submitted.
> > (fix usb first , then patch it for IP, if need be)
> >
> > One advice:
> > Be very paranoid on your test methodology. I looked stupid a couple of
> > times (sorry Rolf!), because I was fooled by the USB interface and/or the
> > Canon firmware.
> > When testing a new patch, I tried some settings in random (DPI ,
> > colour/black-n-white etc) and reported the success/failures.
> > BUT the thing is, that the Canon MF8230 firmware can go into bad-mode,
> when
> > it has received some strange commands, and the following scans might work
> > slightly strange for that reason. I was even fooled by the phenomenon,
> that
> > scanning a 1 by 1 cm square works, but scanning the whole A4 didn't.
> (Well
> > ... there WERE some differences between what worked through USB and IP at
> > this point in time. I'm guessing it was something timing-critical, but I
> > never dissected that last patch from Rolf which fixed it)
> >
> > So I started rebooting the scanner whenever I was in doubt.
> > (disconnect/connect the USB interface plus move Cannon unit from to
> > "printer mode" and back to "scanner mode" was normally enough)
> >
> >
> > So what do we do? / What is status?
> >
> > Since scanning CAN work , one could argue the back-end DOES send all the
> > necessary+correct commands to the printer.
> > If timing is the critical parameter (backed by the fact that something as
> > stupid as enabling IP on the printer-side, suddenly makes it work now and
> > then), maybe we should try to insert an ugly time-delay before every USB
> > write? If that changes anything to the better, we can start to hunt down
> > where it is really necessary, and hopefully find a nicer approach
> > afterwards?
> >
> > Martin, are you comfortable with pulling the code out of the GIT
> > repository, compile , install and experiment with inserting delays?
> > I think there is something called "SANE interface USB" sanei_usb.c/h.
> That
> > was maybe a place to start.
> >
> > Louis, what is the odds of success for this approach?
> >
> > :-)
> >
> > /Troels
> >
> > 2015-01-03 20:43 GMT+01:00 Martin <martin.gu at intergga.ch>:
> > > Am Samstag, 3. Januar 2015, 11.16:10 schrieb Louis Lagendijk:
> > > > On Fri, 2015-01-02 at 22:59 +0100, Martin wrote:
> > > > > Hi Troels
> > > > >
> > > > > > *Is it USB3 (on the computer)?
> > > > >
> > > > > no, it is USB2
> > > > >
> > > > > > *Do you have access to another computer, where you can try it -
> Does
> > >
> > > it
> > >
> > > > > > work excactly the same strange way ... ?
> > > > >
> > > > > No,I don't have access to another computer. But I have also
> Windows 7
> > > > > installed. With Windows 7 and the Canon-software it works OK.
> > > > >
> > > > > > *Does unit have ethernet connection / can you try that way?
> > > > >
> > > > > Yes. With the ethernet connection the printer works. Thus the
> > >
> > > IP-address
> > >
> > > > > below is correct.
> > > > > But I cannot access the scanner.
> > > > >
> > > > >     xsane pixma:MG7500_192.168.0.3
> > > > >
> > > > > results in the error message "illegal argument". Same thing with
> > > > >
> > > > >     scanimage --help -d bnjp://192.168.0.3:8612
> > > >
> > > > Hi Martin
> > > > If the scanner does not work on a USB port it is quite unlikely to
> work
> > > > over the network: the bjnp network code just carries the USB exchange
> > > > over IP.
> > > > Anyhow, you can find the name with scanimage -L (but make sure that
> port
> > > > 8612 is not blocked by a firewall (see the man-page for sane-pixma in
> > > > the latest sources from GIT. you need to enable port 8612 for both
> > > > incoming and outgoing traffic.
> > > >
> > > > Louis
> > >
> > > Hi Louis
> > >
> > > The necessary ports on the firewall are open, yet scanimage -L does not
> > > find
> > > the scanner.
> > >
> > > But this lead to another discovery:
> > > I enabled LAN on the MG7550. And although the unit is connected via
> USB 2
> > > xsane sometimes works?! But with LAN disabled xsane never works without
> > > prior
> > > scanimage -T. And once xsane or scanimage -T failed all succeeding
> calls
> > > fail
> > > until the scanner is switched off and on again.
> > >
> > > Log of xsane working:
> > > [sanei_debug] Setting debug level of pixma to 21.
> > > [pixma] pixma is compiled with pthread support.
> > > [pixma] pixma version 0.17.13
> > > [pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at
> > > libusb:001:007
> > > [pixma] pixma_find_scanners() found 1 devices
> > > [pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at
> > > libusb:001:007
> > > [pixma] pixma_open(): Canon PIXMA MG7500 Series
> > > [pixma] *mp150_open***** This is a generation 4 scanner.  *****
> > > [pixma] [pixma] Reader task id=139772037314304 (threaded)
> > > Reader task started
> > > [pixma]
> > > [pixma] pixma_scan(): start
> > > [pixma]   line_size=4605 image_size=4895115 channels=3 depth=8
> > > [pixma]   dpi=300x300 offset=(0,0) dimension=1535x1063
> > > [pixma]   gamma_table=0x1f201e0 source=0
> > > [pixma]   threshold=127 threshold_curve=0
> > > [pixma]   ADF page count: 0
> > > [pixma] OUT  T=58.770 len=288
> > > [pixma]  00000000:3c 3f 78 6d 6c 20 76 65  72 73 69 6f 6e 3d 22 31
> > > [pixma]  00000010:2e 30 22 20 65 6e 63 6f  64 69 6e 67 3d 22 75 74
> > > ...
> > > Log of xsane not working:
> > > pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at
> > > libusb:001:008
> > > [pixma] pixma_find_scanners() found 1 devices
> > > [pixma] pixma_collect_devices() found Canon PIXMA MG7500 Series at
> > > libusb:001:008
> > > [pixma] pixma_open(): Canon PIXMA MG7500 Series
> > > [pixma] *mp150_open***** This is a generation 4 scanner.  *****
> > > [pixma] INTR T=1.249 len=32
> > > [pixma]  00000000:00 00 00 01 00 00 00 00  00 00 00 00 00 00 00 00
> > > [pixma]  00000010:00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
> > > [pixma]
> > > [pixma] Sending time: '15/01/03 15:32'
> > > [pixma] OUT  T=1.250 len=36
> > > [pixma]  00000000:eb 80 00 00 00 00 00 00  00 00 00 00 00 00 00 14
> > > [pixma]  00000010:31 35 2f 30 31 2f 30 33  20 31 35 3a 33 32 00 00
> > > [pixma]  00000020:00 00 00 53
> > > [pixma]
> > > [pixma] IN   T=21.251 len=-9
> > > [pixma]   ERROR: ETIMEDOUT
> > > [pixma]
> > > ...
> > >
> > > Martin
> > >
> > >
> > > --
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