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So I just realized that the registers I was painstakingly mapping are
simply the National LM9830 registers. Silly me. Anyhow, here's how
some of them are used in this scanner.
Registers: (see lm9830 datasheet. R = read only)
00 - R bulk xfer
01 - R Scan buffer level, in kilobytes, plus 1
02 - R motor status: bit flags
? 0x01
MOTOR_AT_HOME 0x02
PAUSE 0x10 scan buffer is full
POWERDROP 0x20 scanner recently plugged in
03 - gamma table : R(00) G(02) B(04)
gain/offset table : R(01) G(03) B(05)
04 - table direction : write(00) read(20)
05 - dataport addr LSB : 00
06 - dataport (table bulk xfer loc)
07 - command:
motor forward(01) home(02) start-scan(03)
reset(08) stop-motor(00)
09 - horizontal resolution / datamode
low 3 bits = hz dpi divider, dpi = 600/divider
111=12 110(e)=8 101=6 100(c)=4 010(a)=2 001=1.5 000(8)=1
dpi 75(1e) 150(1c) 300(1a) 600,1200(18)
100dpi is identical to 150, 200=300, 400=600.
1e-f active pixel start (004b)
22-23 data pixel start. Units are always 600dpi
24-25 data pixel end. Units are always 600dpi
26 - color mode: greyscale(14) color(15)
28 - not used
29 - lamp mode (02)
2a-2b - lamp pwm
2c-2f - red light (2 bytes On pixel, 2 bytes Off pixel)
30-33 - green light
34-37 - blue light
45 - full/microstepping: micro(03)
46-47 - scan step size
dpi 75(0106) 150(020d) 300(041a) 600(0835) 1200(106b)
cal(3fff)
48-49 - fast feed step size 75(0106) 100-1200(0104)
4a-4b - start skip steps
4e - max buffer level (as read from reg 01). Min 03, max 57.
The scanner will stop moving if the buffer fills, and
will restart when some data is read out.
4f - min buffer level - resume scanning at this point.
50 - reverse steps when buffer full: 75(00) 100-1200(28)
52-53 - reverse phase: dpi 75(398a) 150(3198) 300(2184)
600(0074) 1200(41ac) cal(3594)
57 - stepper duty cycle: dpi 75(3f) 100-1200(1f)
- --
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