[sane-devel] Canon LiDE 90

[Pierre Willenbrock]

Guillaume Gastebois schrieb:
> OK, but via which register is it programmed. I find nothing in GL842 datasheet
> for frontend.
> 
> regards
> Guillaume
> 

the analog frontend is programmed through the serial interface accessed
by address registers 0x50(FERDA)/0x51(FEWRA) and data registers
0x46/0x47(FERDDATA)/0x3a/0x3b(FEWRDATA).

I find this sequence in your log:

R/W ! addr ! data  ! WM8199 register
----+------+-------+-----------------
 W  ! 0x04 ! 0x000 ! reset
 R  ! 0x07 ! 0x041 ! revision number, ==0x41
 W  ! 0x04 ! 0x000 ! reset
 W  ! 0x01 ! 0x02f ! Setup reg 1: mode4==0, pgafs=2, selpd=1, mono=1,
cds=1, en=1
 W  ! 0x02 ! 0x007 ! Setup reg 2: del=0, rlcdacrng=0, 0=0, vrlcext=0,
invop=1, muxop=3
 W  ! 0x03 ! 0x026 ! Setup reg 3: chan=0, cdsref=2, rlcv=6
 W  ! 0x06 ! 0x00d ! Setup reg 4: fm=0, intm=0, rlcint=1, fme=1,
acycnrlc=0, linebyline=1
 W  ! 0x08 ! 0x000 ! Setup reg 5: 0=0, posnneg=0, vdel=0, vsmpdet=0
 W  ! 0x20 ! 0x050 ! dac value red(offset value)
 W  ! 0x21 ! 0x050 ! dac value green(offset value)
 W  ! 0x22 ! 0x050 ! dac value blue(offset value)
 W  ! 0x23 ! 0x050 ! dac value rgb(offset value)
 W  ! 0x28 ! 0x028 ! pga gain red(0x28 is a factor of 0.85)
 W  ! 0x29 ! 0x028 ! pga gain green
 W  ! 0x2a ! 0x028 ! pga gain blue
 W  ! 0x2b ! 0x028 ! pga gain rgb


all WM81xx(at least where datasheets are available) share a similar
register layout, with revision 0x41 at address 7. writing to the rgb
variant of pga gain/dac value results in writes to all the color
specific registers, so it is not needed.

So, you have in Genesys_Frontend: reg[1]=0x2f, reg[2]=0x07, reg[3]=0x26,
reg2[0]=0x0d, reg2[1]=0x00, the rest of reg/reg2 =0, all sign[x]=0,
offset[x]=0x50, gain[x]=0x28.

this does not match anything currently in genesys_devices.c. Just add
one entry to the Wolfson array, #define a DAC_xxxx to 7 in genesys_low.h
and put that in your Genesys_Model.

The gain/offset setting should be good for led calibration and will be
replaced by gain/offset calibration.

After that, get a scan of the calibration area(the area under the
housing at the parking position). For this, put 0 into the x_offset and
y_offset in your Genesys_Model. If this turns out to be similar to the
calibration area of the lide 50, led/offset/gain-calibration should work
with only minor changes.

Regards,
  Pierre