--- /dev/null
+<?xml version="1.0" ?>
+<!DOCTYPE defcomplib SYSTEM "http://sources.redhat.com/sid/component.dtd">
+
+<defcomplib lib="liblcd-char-display.la" dlsym="lcd_char_display_component_library">
+ <defcomponent name="hw-lcd-char-display">
+ <defpin name="FR" direction="in" legalvalues="binary" behaviors="display"/>
+ <defpin name="row-col" direction="in" legalvalues="2 shorts as a 32-bit value" behaviors="display"/>
+ <defattribute name="width" category="configuration" legalvalues="any positive value" defaultvalue="80" behaviors="configuration"/>
+ <defattribute name="height" category="configuration" legalvalues="any positive value" defaultvalue="24" behaviors="configuration"/>
+ </defcomponent>
+ <synop>
+ <p>
+ Simulates a dot matrix LCD display, using curses (a cursor control library)
+ to manage the graphics inside a text window.</p>
+ </synop>
+ <func>
+ <modelling>
+ <p>
+ <p>
+ The LCD display model is somewhat abstracted from the physical device:</p>
+ <ul>
+ <li>
+ <p>
+ A real display typically has separate row and column pins that are cycled
+ to select each pixel in the display. These are replaced by 2 pins
+ in the model. The
+ <pin>FR</pin> (frame) pin is driven to 1 to identify that a new
+ frame is starting, and driven to 0 when the frame is finished. The
+ <pin>row-col</pin> pin incorporates all the functionality of the row and column
+ drivers on the real chip. This pin is driven once for each "on" pixel
+ in the display, and the value on the pin is the [X,Y] co-ordinates of
+ the pixel, encoded as two adjacent 16-bit values in the 32-bit pin value.</p>
+ <p>
+ With these two pins, a display refresh cycle starts when the FR pin is
+ asserted; the [X,Y] co-ordinates of all the "on" pixels are then
+ transmitted on the
+ <pin>row-col</pin> pin; and the
+ <pin>FR</pin> pin is de-asserted to end
+ the refresh cycle.</p></li>
+ <li>
+ <p>
+ The physical device must be refreshed periodically, but the model retains
+ its last written values indefinitely.</p></li></ul></p>
+ </modelling>
+ <behavior name="configuration">
+ <p>
+ The width and height attributes set the display size in units of
+ characters. For example, the default values are 80 and 24 for width
+ and height, respectively. This is the size of a standard CRT window.</p>
+ </behavior>
+ <behavior name="display">
+ <p>
+ See discussion of the
+ <pin>FR</pin> and
+ <pin>row-col</pin> pins in Modeling section above.</p>
+ </behavior>
+ <convention name="functional component" supported="true">
+ <p>
+ This is a functional component.</p>
+ </convention>
+ <convention name="Save/restore" supported="true">
+ <p>
+ Save/restore is supported.</p>
+ </convention>
+ <convention name="Triggerpoint" supported="true">
+ <p>
+ Triggerpoint support is available on all three input pins.</p>
+ </convention>
+ </func>
+ <env>
+ <p>
+ <title>Related components</title>
+ <p>
+ The LCD display is typically connected to an LCD controller.
+ The following configuration file segment shows how the
+ <complib>hw-lcd-hd44780u</complib> LCD
+ controller can be connected to the display:</p>
+
+ <code> new hw-lcd-hd44780u-a00 lcd # Standard Japanese font
+ new hw-lcd-char-display display
+
+ # display size is in pixels - ie. font-width*display-height
+ set display width 40 # 8 chars X 5 pixels per char
+ set display height 8 # single line of 8 pixels
+
+ # connect the LCD to the display
+ connect-pin lcd row-col -> display row-col
+ connect-pin lcd FR -> display FR</code></p>
+ </env>
+</defcomplib>
+
+
+
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