[sane-devel] Canon_pp freezes halfway

[selma k]

Matthew, thank you for your help.

The scanner now works in regular mode. Interesting enough, it freezes in force_nibble mode.

For those who have problems with Canons N340P and FB330P.
1. Set manually the io ranges and dma mode in BIOS
For me these were 378-37F, 778-77D, IRQ 7
2. Set ECC+EPP mode for your parallel port in BIOS.
3. Add the following line to the modprobe.conf (/etc/modeprobe.d/options on Ubuntu)

options parport_pc io=0x378 io_hi=0x778 dma=1

4. Reload the parallel port related modules using modprobe (my choice would be to restart)
5. If the scanner still does not work, try putting a comment on force_nibble/removing the comment in canon_pp.conf.




----------------------------------------
> CC: sane-devel at lists.alioth.debian.org
> From: stauff at guarana.org
> Subject: Re: [sane-devel] Canon_pp freezes halfway
> Date: Wed, 29 Nov 2006 23:33:15 +1100
> To: kselmak at hotmail.com
> 
> Hi there!
> 
> On 29/11/2006, at 11:22 AM, selma kapetanovic wrote:
> ...
> > I am running
> > ..
> > * Parallel port is in EPP mode (BIOS setting)
> 
> I'll get back to this...
> 
> > It scans most often (not always) in black and white. For color mode  
> > the number of "reads" varies from two to four.
> 
> Hmm.. that's quite weird, but I'm guessing it's just the increased  
> amount of data in colour mode.
> 
> > I spent quite some time trying to make it work. Should I have known  
> > it takes so much time, I would toss the scanner in the garbage.
> > At this point it is more of a challenge. I know that I am not the  
> > only person who has the problem and I want to post the solution to  
> > the Ubuntu web site along with a recommendation not to buy canon  
> > scanners.
> 
> Well, I'm probably not telling you anything you don't know, but it's  
> not so much the scanner as the port.
> 
> Parallel ports are flakey things - it's amazing they ever work  
> really.  They're just not really designed to push the large amounts  
> of data scanners need to move.
> 
> > ...
> > [canon_pp] detect_mode: Port supports ECP-H.
> > [canon_pp] detect_mode: Port supports interrupts
> ...
> 
> So according to the probing done by libieee1284, the port supports  
> ECP-H transfers and interrupts, but no mention of DMA.  Generally  
> speaking I've had the most success in the past using ECP and DMA mode  
> or pure software mode, but pure software is very slow and nasty - DMA  
> is much preferred if you can get it working.
> 
> Anyway, I think the first thing to try is setting the BIOS setting to  
> "ECP+EPP" if it has such an option, instead of "EPP".  After that you  
> should maybe allocate a fixed IRQ to the parallel port (yes, I know,  
> plug&play - but it's just more reliable this way!).  Once you've done  
> that you can try playing with the parport_pc module settings to try  
> and get DMA transfers working.  I wish there was an easier way, but  
> that's pretty much it.
> 
> Hope that helps!
> 
> Cheers,
> 
> - Matthew

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