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-
-This is the README file for the Crystalfontz display driver for lcd4linux
-
-This driver supports the 632/634 LCD-Modules from Crystalfontz, but should
-work for the 626 and 636 modules too. The 634 is a 20x4 character display,
-while the others only display 16x2. I've written the driver using a
-634 module.
-
-The driver understands the following configuration parameters:
-
-Display: any of 626, 632, 634 and 636.
-
-Port: serial device (i.e. ttyS0) the LCD module is connnected
- to.
-
-Speed: any of 1200, 2400, 9600 and 19200. By default, the driver
- uses 9600 which is the speed the LCD modules are hardwired
- at. If your module works at a different speed than 9600,
- use this parameter. Otherwise omit it (i.e. omit it when
- you have a 634).
-
-Backlight: controls the backlight brightness. Quote from 634.pdf from
- the Crystalfonts-Webserver[1]: "0=OFF 100=ON. Intermediate
- values vary the brightness. There are a total of 25 possible
- brightness levels."
-
-Contrast: controls the contrast settings. Quote[1]: "0=very light,
- 100 = very dark. 50 is typical. There are a total of 25
- possible contrast levels."
-
-
-Known bugs:
-When you draw a bar over a previously drawn textfield, the white portion
-the bar will not erase the text. Only when the black portion of the bar
-has reached the full bar length, the text will be erased. I did not bother
-to implement that, since in lcd4linux, the whole display-screen is erased
-prior to switching to a different 'screen'. Implementing this feature would
-just add to program-overhead. Yes, you guessed it: I did not use the "bar"-
-command that comes with the LCD-module, but wrote my own instead.
-lcd4linux also supports "split-" or "dual-bars" (two bars in one segment),
-which are not available on the Crystalfontz firmware.
-
- [1] http://www.crystalfontz.com
-