On Saturday 30 May 2015 23:54:28 Ondrej Zary wrote: > On Friday 29 May 2015 23:02:38 Ondrej Zary wrote: > > On Monday 11 May 2015 22:05:33 Stef wrote: > > > On 09/05/2015 00:32, Ondrej Zary wrote: > > > > On Friday 08 May 2015 21:46:36 Ondrej Zary wrote: > > > >> On Friday 08 May 2015 16:17:53 Ondrej Zary wrote: > > > >>> On Thursday 07 May 2015 23:32:28 Ondrej Zary wrote: > > > >>>> Hello, > > > >>>> I just got Umax Astra 4450 (same as 4400 except with UTA?) for a > > > >>>> while and tested it with SANE. Unfortunately, it does not work. > > > >>>> The lamp turns on and the head moves a bit, then goes back (two > > > >>>> times) and the scan ends with these errors: > > > >>>> > > > >>>> [rts8891] simple_scan: failed to wait for data > > > >>>> [rts8891] gain_calibration: failed scan data > > > >>>> [rts8891] sane_start: failed to do gain calibration! > > > >>>> scanimage: sane_start: Error during device I/O > > > >>> > > > >>> I've modified sane_start() in rts8891.c to not fail if > > > >>> gain_calibration() returns error. It now scans the complete area > > > >>> and the output resembles what's in the scanner (black template for > > > >>> UTA use with green text) but it's blurry, shifted horizontally (and > > > >>> the gain is wrong, of course): > > > >>> http://www.rainbow-software.org/linux_files/umax_astra_4450/no_gain > > > >>>_c al ib ra tion.ppm.gz > > > >>> http://www.rainbow-software.org/linux_files/umax_astra_4450/no_gain > > > >>>_c al ib ra tion.log > > > >>> > > > >>> Looks like there's a problem with the sensor type? > > > > > > > > Gain calibration fails because dev->left_offset (and thus xstart) is > > > > negative. If I set xstart to 4, gain calibration passes (although > > > > it's wrong: ends after first pass with 0x1f,0x1f,0x1f). > > > > > > > > So find_margin() does not work... > > > > > > Hello, > > > > > > you could try to hardcode gain values at the end of gain > > > calibration to see if scan is close to be correct. > > > > The dumps from Windows are very different. I've transferred the register > > settings to sane-rts8891 but with only partial success. 150dpi and 300dpi > > seems to work if I don't touch 0x7a register. 75dpi, 600dpi and 1200dpi > > are broken no matter what I tried. > > > > The experimental patch is available at > > http://www.rainbow-software.org/linux_files/umax_astra_4450/umax_astra445 > >0- test.diff > > Found a bug causing 600dpi scans to return only solid color area. It was a > problem with 0xaa "escaping" - I misread the dump because of that and used > wrong registers. After fixing, it didn't work at all - because the original > sane-rts8891 code does not "escape" 0xaa values in registers above 0xb3. > > After fixing that, 600dpi is still broken but at least some real data is > coming from the scanner now. > > New patch: > http://www.rainbow-software.org/linux_files/umax_astra_4450/umax_astra4450- >test2.diff
Here's a new, more polished patch: http://www.rainbow-software.org/linux_files/umax_astra_4450/umax_astra4450-test3.diff - buttons now work - lamps work correctly (main lamp turns off at close, UTA lamp always off) - xsane now works for scanning at 150 or 300 dpi - preview (75dpi) is broken as well as 75dpi, 600dpi and 1200dpi -- Ondrej Zary -- sane-devel mailing list: [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to [email protected]
