Guillaume Gastebois schrieb: > 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).
What about only setting register 0x7f? that one should do something without needing to setup reg 0x1a. I didn't expect reg[0x1a]=0x24 to work without setting the corresponding clock bit masks. What happens if you leave line 1159 commented and set regs 0x74-0x7d(my guess: works without changes in behaviour)? Does setting regs 0x71-0x73 change anything (line 1159 still commented)? (I have only little understanding of the actual relative timing and use of all clock signals going out to the ccd/afe, so i am guessing and doing experiments.) But this seems to be basically working. Please send your changes leading to a usable scan, so i can integrate them. Regards, Pierre > Regards > Guillaume > > Pierre Willenbrock a ?crit : >> 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 ?crit : >>>> 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 >>>> >>>> >> >> >
