>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. > >Regards, > Pierre
OK, i see some image (very far to end result...). But can you explain to me how to know the correct values for genesys_frontend ???? These parameter have big influence on resulting image. Thank you. Guillaume