[sane-devel] Plustek Optic Slim 2420

[Maximilian Fabricius]

On 1/2/07, Pierre Willenbrock <pierre at pirsoft.dnsalias.org> wrote:
> Maximilian Fabricius schrieb:
> > On 1/1/07, Pierre Willenbrock <pierre at pirsoft.dnsalias.org> wrote:
> >> Maximilian Fabricius schrieb:
> >> > Hi all,
> >> >
> >> > I have been working on trying to get the OpticSlim 2420 to work.
> >> > Is disassembled the scanner (hardware) and made pictures. they may be
> >> > found here
> >> >
> >> > http://rosa.physik.tu-berlin.de/~mxhf/OS2420/
> >> >
> >> > They are fairly high resolution ~1MB per image so that you can see all
> >> > details. lease excuse the German on the navigation bar.
> >>
> >> This scanner has a Wolfson Micro WM8196 analog frontend, an ICSI
> >> IC41LV16256-35K memory chip(256k 16bit words), LB1940 motor driver chip.
> >>
> >> > From this I learned that the scanner has a GL842 chip (not GL841). The
> >> > GL842 seems
> >> > to be very similar to the 841 though as a quick scan through the data
> >> > sheet revealed.
> >>
> >> In fact, at least the things documented in genesys' datasheets are
> >> identical.
> >>
> >> >
> >> > So far I cloned the ST24 section in genesys_gl841 and
> >> > I got as far as being able to execute "tstbackend" without getting an
> >> > error.
> >> > I had to comment the Init_Devices lines 4990-4993 in genesys_gl841.c.
> >> >
> >> > I am somewhat stuck now. Starting scanimage results in strange noise
> >> > from the scanner.
> >>
> >> Try the motor struct i sent in the Canon-4400F thread[1].
> >>
> >> Concerning your frontend settings, use the register state just before
> >> the preview scan starts(which probably is urb 1367 in the log referenced
> >> in [2]).
> >>
> >> By the way: i am preferring usbsnoop[3], which dumps the usb log into a
> >> plain text file, making parsing it way easier. Also, it does not stop
> >> logging, when it encounters an urb larger than 16k or so(fortunately for
> >> you, the plustek driver does not use that large urbs).
> >>
> >> Regards,
> >>   Pierre
> >>
> >> [1]
> >> http://lists.alioth.debian.org/pipermail/sane-devel/2006-December/018335.html
> >>
> >> [2]
> >> http://lists.alioth.debian.org/pipermail/sane-devel/2007-January/018338.html
> >>
> >> [3]
> >> http://benoit.papillault.free.fr/usbsnoop/
> >>
> >
> >
> > Thanks Pierre,
> >
> > I am currently playing around with the frontend. I tried setting it to
> > the values I got from my log.
> >
>
> Hi Maximilian,
>
> some correction to the register mappings inline
>
> > -- SNIP SNIP ---
> > {{0x00, 0x27, 0x24, 0x0f}    //reg[4]:    0x00 - 0x03
> >   , {0x00, 0x00, 0x0f}        //sign[3]: 0x00 - 0x06
>                                            0x24 - 0x26
> >   , {0x02, 0x01, 0x01}        //offset[3]: 0x20 - 0x22
> >   , {0xc4, 0xc8, 0xd2}        //gain[3]: 0x28 - 0x2a
> >   , {0x00, 0x00, 0x00}        //reg2[3]
>                                          : 0x05, 0x06, 0x08
> >   }
> >  ,                /* OS2420 */
> > -- SNIP SNIP ---
> >
> > I also used your motor struc.
> > So far the scanner starts moving the ... sled? And only the green
> > light is powered on. But the sled only moves for about a cm. Then it
> > starts making noise like a quiet machine gun.
>
> Does it still move when making noise? If not, try increasing the step
> times. The upper limit is 65535. You could also try to change the
> "maximum step mode" to 0(only full steps allowed).
>
> There may be issues with custom powermanagement features, controlled via
> the gpio pins. Finding good settings for the gpio pins, or even what
> function they control, can take a lot of experimentation.
>
> > I am not done playing around and haven't double checked my frontend
> > register values yet.
> >
> > It might help to understand what they actually mean.
> >
>
> You can find the datasheet linked here:
> http://www.wolfsonmicro.com/products/WM8196/
>
> complete with register description.
>
> Regards,
>   Pierre
>

Ok screw this,

I had the regs completely wrong, so this is right?
 ,				/* ST24 */
  {{0x00, 0x23, 0x24, 0x0f} 	// reg[4]:    0x00 - 0x03
   , {0x00, 0x00, 0x00}		//sign[3]: 0x24 - 0x26
   , {0x02, 0x01, 0x01}		//offset[3]: 0x20 - 0x22
   , {0xc4, 0xd2, 0xc8}		//gain[3]: 0x28 - 0x2a
   , {0x00, 0x0f, 0x00}		//reg2[3]: 0x05, 0x06, 0x08
   }

I just found out that the sled is still moving when the scan makes
this "tuktuktuk"-noise. Just very, very slowly.

So the behaviour is:
Sled moved to home position.
Blinks shortly white.
Turns on green light.
Moves quickly for about a cm.
Turns light off.
Moves then very slowly. Would take in the order of 15 per page?!


Max