[sane-devel] Canon LiDE 90

[Guillaume Gastebois]

Hello,

I'm back.

Today I made two tests : one with un commenting line 1159 and adding 
regs 0x71, 0x72, 0x73, 0x75, 0x76, 0x79, 0x7c, 0x7d, 0x7f in 
gl841_init_registers.
Result is a totally black image 
(http://ggastebois.free.fr/lide90_snoop/04_test1.tar).

The other is with un commenting line 1159 and without adding regs 0x71, 
0x72, 0x73, 0x75, 0x76, 0x79, 0x7c, 0x7d, 0x7f in gl841_init_registers.
Result is a totally black image too 
(http://ggastebois.free.fr/lide90_snoop/04_test2.tar).

Regards
Guillaume

Pierre Willenbrock a écrit :
> Guillaume Gastebois schrieb:
>> Hello,
>>
>> I modified these registers. But the scanner locks writting continiously :
>> "[genesys] sanei_genesys_read_register (0x41, 0xf4) completed".
>>
>> I modified 0x1a=0x24 and 0x1d=0x02 in Genesys_Sensor. In log I see 
>> 0x1d=0x02 but 0x1a=0x00 ??
> 
> For the missing change of 0x1a: The code block for setting this value
> (along with 0x1b..0x1d, which is then hardcoded to 0x02) is commented
> out, genesys_gl841.c:1159. This is probably the case, because they were
> not needed for my specific scanner.
> 
> I cannot explain the lockup. I'd play around with different sets of
> registers and see if they work. But i guess, register 0x1a is a key to
> get the rest working.
> 
>> I will be long for next answer as I take one week holidays !
> 
> I hope you had a nice week holidays.
> 
> Regards,
>   Pierre
> 
>> regards
>> Guillaume
>>
>> Pierre Willenbrock a écrit :
>>> Hi,
>>>
>>> Guillaume Gastebois schrieb:
>>>> Hello,
>>>>
>>>>> So, we need to check what parts of the clocking we need to setup
>>>>> differently.
>>>>>
>>>>> Candidates:
>>>>>
>>>>> reg   sane  windows
>>>>> 0x1a  0x00  0x24     enable clock 3,4 manual output, invert clock 4
>>>>> 0x1d  0x04  0x02     just a smaller toggle "shoulder".
>>>>> 0x71  0x00  0x05     RS signal seems to be not used.
>>>>> 0x72  0x00  0x07     CP signal seems to be not used.
>>>>> 0x73  0x00  0x09     CP signal seems to be not used.
>>>>> 0x75  0x00  0x01     clock 1 bitmap
>>>>> 0x76  0x00  0xff     clock 1 bitmap
>>>>> 0x79  0x00  0x3f     clock 3 bitmap
>>>>> 0x7c  0x00  0x1e     clock 4 bitmap
>>>>> 0x7d  0x00  0x11     change RS on falling edge of system clock, use DLY
>>>>> 0x7f  0x00  0x50     delay each of BSMP and VSMP by 8.33ns (DLY)
>>>>>
>>>>> The clock 1 stuff seems to be not needed, as it is in automatic mode.
>>>>> But clock 3/4 look interesting. The delay of BSMP/VSMP may be useful, too.
>>>>>
>>>> 0x1a was still 0x24. I modified 0x1d which was 0x04 to 0x02. Result is 
>>>> on http://ggastebois.free.fr/lide90_snoop/22_test1.tar.
>>>>
>>>> I doesn't find where to modify 0x71-0x7f !!!
>>> Add them to gl841_init_registers.
>>>
>>>>>> Another thing : I always have a brither vertical line where there is a
>>>>>> small black rectangle in the calibration area.
>>>>> The small black rectangle is included when acquiring the white level.
>>>>> Reduce shading_lines(second to last entry) in Genesys_Model to 250, that
>>>>> way it is not seen anymore.
>>>>>
>>>> Done, works.
>>>>
>>>>> Oh, and please update from cvs again. A small mistake in
>>>>> gl841_bulk_write_registers made the debug register dumps useless.
>>>>>
>>>> Done.
>>>>
>>>>
>>>> Another thing : when I make several scan with sane backend and sane 
>>>> command line, I have alternatively brite and dark images !!! Why ???
>>> The calibration is probably giving widely differing results with
>>> different starting conditions. It swings between two states. But you
>>> shouldn't see this after the gl842 did its shading correction. Then, the
>>> problem is probably overexposure of the ccd cells. Try reducing the
>>> upper threshold in genesys_gl841.c:4383
>>>
>>> 	  if (avge > 2000) {
>>> 	      expr = (expr * 2000) / avge;
>>> 	      expg = (expg * 2000) / avge;
>>> 	      expb = (expb * 2000) / avge;
>>>
>>> Reducing the lower threshold may be needed, too. The current values for
>>> your scanner are:
>>> expr: 1235
>>> expg: 1235
>>> expb: 675
>>>
>>> No guarantee that this helps at all.
>>>
>>>> Regards
>>>> Guillaume
>>> Further, we need to figure out a way to get the LEDs go completely dark.
>>> 0x101 is just about half of 675. I will experiment a bit with my
>>> scanner, to find out if the gl842 can do that.
>>>
>>> Regards,
>>>   Pierre
>>>
>>>
> 
> 
>