[sane-devel] Canon LiDE 90

[Guillaume Gastebois]

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 ??

I will be long for next answer as I take one week holidays !

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
> 
>