[Lcd4linux-devel] DOG-M via I2C on WRAP

[Stefan K. <ste...@cr...>]

Hi Folks,

yesterday my DOG-M awaked from death ...

There are 14 init-nibbles to send. Without them, the LCD keeps dark.
There are instructions for setting 5 bits of contrast-level, internal
bias, booster, amplifier and follower (what ever that means ...) and the
usual things like 'display on', 'cursor home', 'display clear', 'display
size' and so on. If you like to help me, take a look into the datasheets
at [1] and [2].

I managed to do a 8bit init via dip-switches ... and it awakes! Then I
wrote a shellscript to do the same with 4bit and it worked too.

After initialisation lcd4linux runs on the display. I made a few
pictures, view it at [3].

But ...

I2C _is_ slow. No way to have scrolling lines by now.
Luis, what about your 8bit (2x PCF8574) experiment? May I have your
details? Adressing, configuration, schematics?

The DOG-M seems to use a different way for adressing the positions on
the display. I've one with 3 lines / 16 characters and one with 2 lines
/ 16 characters. Maybe my init isn't correct by now. I'll keep trying more.

By the limits of the WRAP-Board, I'll try to plug the DOG-M on the
GPIO-header too. There are 7 gpio pins to use. I think, that I could use
parts of the "Routerboard" or "Soekris" code for that.

But how to integrate into lcd4linux? By now, I think I should add a new
'Model' to the HD44780 section. Is that the right way? I want to have
the init-sequence once for both wiring-variants. I want also to have the
contrast setting by configuration. Maybe one wants to plug a DOG-M via
parport or USB at 5V - it's possible and the init should work for that too.

[1] german: http://www.lcd-module.de/deu/pdf/doma/dog-m.pdf
[1] english: http://www.lcd-module.de/eng/pdf/doma/dog-me.pdf
[2] http://www.lcd-module.de/eng/pdf/zubehoer/st7036.pdf
[3] http://gallery.port23.de/v/bastard/wrap/lcd/

MfG

Stefan