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