[lcd4linux @ 2000-05-03 09:37:32 by herp]

1 files changed, 44 insertions, 0 deletions

diff --git a/README.Crystalfontz b/README.Crystalfontz
new file mode 100644
index 0000000..4c76b45
--- /dev/null
+++ b/README.Crystalfontz
@@ -0,0 +1,44 @@
+
+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
+