[sane-devel] Canon LiDE 90

[Guillaume Gastebois]

Hello,

Thank you Pierre.
I did all what you do : commenting the code in 
genesys_flatbed_calibration (Offset/Gain calibration commented out too), 
added OPTICAL_FLAG_DISABLE_SHADING to the flags in 
gl841_init_optical_regs_scan

analog frontend is so :
    {0x00, 0x21, 0x00, 0x00},
    {0x02, 0x8b, 0x02, 0x8b, 0x02, 0x8b, 0x20, 0x06, 0x00, 0xff,
     0x24, 0x00, 0x00, 0x04},
    {0x02, 0x04,
     0x02, 0x04, 0x02, 0x04,
     0x0a, 0x71,
     0x55,
     0x00, 0x00, 0x20, 0x41}

I can now see my dinosaure ! See picture attached (colored dinosaure on 
a white page). It's far from perfect !

 >Guillaume Gastebois schrieb:
 >> Hello,
 >>
 >> OK, my motor moves !
 >
 >Cool.
 >
 >>
 >> But, someting doesn't work during initialisation : I get floating >point
 >> error !
 >>
 >> I modified genesys_gl841.c for instrumentation and genesys_devices.c
 >> (genesys_sensor section) in accordance to my windows usb snoop log >(see
 >> attacement).
 >>
 >> SANE_DEBUG_GENESYS_GL841=255 scanimage
 >> -device-name=genesys:libusb:001:066 > toto.pnm ends with :
 >
 >(please use both SANE_DEBUG_GENESYS_GL841=255 and
 >SANE_DEBUG_GENESYS=255, the device specific code calls back into the
 >unspecific code)
 >
 >>
 >> [genesys_gl841] reg[0x86] = 0x00
 >> [genesys_gl841] reg[0x87] = 0x00
 >> [genesys_gl841] gl841_bulk_write_register: wrote 104 registers
 >> [genesys_gl841] gl841_led_calibration: starting first line reading
 >> [genesys_gl841] gl841_begin_scan
 >> [genesys_gl841] gl841_bulk_write_register (elems = 4)
 >> [genesys_gl841] reg[0x03] = 0x5f
 >> [genesys_gl841] reg[0x01] = 0x81
 >> [genesys_gl841] reg[0x0d] = 0x01
 >> [genesys_gl841] reg[0x0f] = 0x01
 >> [genesys_gl841] gl841_bulk_write_register: wrote 4 registers
 >> [genesys_gl841] gl841_begin_scan: completed
 >> [genesys_gl841] gl841_bulk_read_data: requesting 31200 bytes
 >> [genesys_gl841] gl841_bulk_read_data: trying to read 31200 bytes of 
 >>data
 >> [genesys_gl841] gl841_bulk_read_data read 31200 bytes, 0 remaining
 >> [genesys_gl841] gl841_bulk_read_data: completed
 >> [genesys_gl841] gl841_led_calibration: average: 0,801,302
 >> [genesys_gl841] gl841_led_calibration: 
 >>avga=367,expr=0,expg=0,expb=0,avge=0
 >> Exception en point flottant (floating point exception)
 >
 >that line above should be more like this:
 >[genesys_gl841] gl841_led_calibration: average: 43901,43865,43387
 >
 >But you can ignore led-calibration for now, that is not essential when
 >debugging the backend. Just make sure the exposure settings in
 >Genesys_Sensor.regs_0x10_0x1d are good, for example from an usb log the
 >last register write to 0x10-0x15 before receiving actual scanned data.
 >If those stay all zero, the rgb-leds in your scanner are very probably
 >not controlled using the rgb-led-control-feature of the gl84x.
 >
 >You can disable led calibration by commenting out the code in
 >genesys_flatbed_calibration. Offset/Gain calibration can be commented
 >out when the values in Genesys_Frontend are good, Shading calibration
 >can be disabled when you add OPTICAL_FLAG_DISABLE_SHADING to the flags
 >for gl841_init_optical_regs_scan. When shading calibration is disabled,
 >you get vertical stripes, the others lead to too dark/bright r/g/b 
 >channels.
 >
 >Things that may be missing:
 >* leds need to be controlled correctly
 >* cis-sensor needs to get the correct clock signals(line toggle+pixel
 >  clock, half-resolution signal is optional for now)
 >* the analog frontend registers need to be setup correctly in
 >  Genesys_Frontend
 >* the readout position in the data stream from the analog frontend may
 >  need tweaking(registers 0x52,0x53)
 >
 >When that is done, you should be able to get an image from your
 >scanner, although calibration may be lacking.
 >
 >The data stream inside gl84x based cis-scanners(at least the LiDE
 >35/50/60) looks like this:
 >-----+
 >gl84x!
 >-----+
 >  ! r,g,b led control line, selects colors r, g, b in turn,
 >  ! controls exposure for each color
 >+---------+
 >!r,g,b led!
 >+---------+
 >  ! r,g,b light
 >+--------+
 >!original!
 >+--------+
 >  ! r,g,b component
 >+----------+
 >!cis sensor!
 >+----------+
 >  ! voltages proportional to light intensity
 >+---------------+
 >!analog frontend!
 >+---------------+
 >  ! 16bit intensity, multiplexed on 8bit data bus
 >-----+
 >gl84x!
 >-----+
 >
 >> See sample image toto.jpg too (when commenting zero division in
 >> genesys_gl841.c the scanner scans an image).
 >>
 >> Help needed thanks
 >>
 >> Guillaume
 >
 >Regards,
 >  Pierre
-------------- next part --------------
A non-text attachment was scrubbed...
Name: toto.jpg
Type: image/jpeg
Size: 30706 bytes
Desc: not available
Url : http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20080121/b13a9468/attachment-0001.jpg