Difference between revisions of "Unit HD44780"

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! '''Note'''
 
! '''Note'''
 
| None documented
 
| None documented
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|-
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|}
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</div></div>
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<br />
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 +
'''HD44780 helper functions'''
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
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<pre style="border: 0; padding-bottom:0px;">function HD44780WriteChar(Console:PHD44780Console; Ch:Char):LongWord;</pre>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Write character data to the HD44780 device</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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! '''Note'''
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| Caller must hold the Console lock
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|-
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|}
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</div></div>
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<br />
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
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<pre style="border: 0; padding-bottom:0px;">function HD44780WriteData(Console:PHD44780Console; Value:Byte):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Write command data to the HD44780 device</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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! '''Note'''
 +
| Caller must hold the Console lock
 +
|-
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|}
 +
</div></div>
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<br />
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
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<pre style="border: 0; padding-bottom:0px;">function HD44780PulseEnable(Console:PHD44780Console):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Pulse the clock enable line off, on, off to send a command</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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! '''Note'''
 +
| Caller must hold the Console lock
 +
|-
 +
|}
 +
</div></div>
 +
<br />
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<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
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<pre style="border: 0; padding-bottom:0px;">function HD44780CursorHome(Console:PHD44780Console):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Return the cursor to the top left corner</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
 +
! '''Note'''
 +
| Caller must hold the Console lock
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
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<pre style="border: 0; padding-bottom:0px;">function HD44780CursorBlink(Console:PHD44780Console; Blink:Boolean):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Set the cursor blinking to on or off</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
 +
! '''Note'''
 +
| Caller must hold the Console lock
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function HD44780CursorVisible(Console:PHD44780Console; Visible:Boolean):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Set the cursor to visible or not visible</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! '''Note'''
 +
| Caller must hold the Console lock
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function HD44780CursorPosition(Console:PHD44780Console; Row,Col:Byte):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Set the cursor position to Row, Col</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! '''Note'''
 +
| Caller must hold the Console lock
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function HD44780DisplayEnabled(Console:PHD44780Console; Enabled:Boolean):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Set the display state to on or off</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! '''Note'''
 +
| Caller must hold the Console lock
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function HD44780AddCharacter(Console:PHD44780Console; Location:Byte; Character:THD44780Character):LongWord;</pre>
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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Add a custom character to the display</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
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{| class="wikitable" style="font-size: 14px; background: white;"
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|-
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! '''Note'''
 +
| Caller must hold the Console lock
 
|-
 
|-
 
|}
 
|}

Revision as of 00:38, 14 October 2016

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Description

The Hitachi HD44780 is a dot matrix liquid crystal display controller. It supports 5x8 or 5x10 characters and includes a 240 character font in ROM, 80 bytes of character RAM and 64 bytes of character generator RAM for custom characters.

The device support 4 bit or 8 bit modes, and has a range of standard functions for display clear, display on/off, cursor on/off, character blink, cursor shift etc.

This unit creates a Console device to represent the LCD and provides the standard console device functions (where appropriate) to draw text, clear the screen, scroll text and manage the cursor.

Currently only 4 bit mode is supported but extension to include 8 bit mode is possible with some additional setup and support functions.

Constants

To be documented

Type definitions

To be documented

Public variables

To be documented

Function declarations


HD44780 functions

[Expand] 
function HD44780ConsoleCreate(GPIO:PGPIODevice; const Name:String; Width,Height,RS,RW,EN,D4,D5,D6,D7:LongWord):PConsoleDevice;
Description: To be documented


[Expand] 
function HD44780ConsoleDestroy(Console:PConsoleDevice):LongWord;
Description: To be documented


HD44780 console functions

[Expand] 
function HD44780ConsoleOpen(Console:PConsoleDevice):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleClose(Console:PConsoleDevice):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleClear(Console:PConsoleDevice; Color:LongWord):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleScroll(Console:PConsoleDevice; X1,Y1,X2,Y2,Count,Direction:LongWord):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleDrawChar(Console:PConsoleDevice; Handle:TFontHandle; Ch:Char; X,Y,Forecolor,Backcolor:LongWord):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleDrawText(Console:PConsoleDevice; Handle:TFontHandle; const Text:String; X,Y,Forecolor,Backcolor,Len:LongWord):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleDrawBlock(Console:PConsoleDevice; X1,Y1,X2,Y2,Color:LongWord):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleDrawWindow(Console:PConsoleDevice; Handle:TWindowHandle):LongWord;
Description: To be documented


[Expand] 
function HD44780ConsoleGetPosition(Console:PConsoleDevice; Position:LongWord; var X1,Y1,X2,Y2:LongWord):LongWord;
Description: To be documented


HD44780 helper functions

[Expand] 
function HD44780WriteChar(Console:PHD44780Console; Ch:Char):LongWord;
Description: Write character data to the HD44780 device


[Expand] 
function HD44780WriteData(Console:PHD44780Console; Value:Byte):LongWord;
Description: Write command data to the HD44780 device


[Expand] 
function HD44780PulseEnable(Console:PHD44780Console):LongWord;
Description: Pulse the clock enable line off, on, off to send a command


[Expand] 
function HD44780CursorHome(Console:PHD44780Console):LongWord;
Description: Return the cursor to the top left corner


[Expand] 
function HD44780CursorBlink(Console:PHD44780Console; Blink:Boolean):LongWord;
Description: Set the cursor blinking to on or off


[Expand] 
function HD44780CursorVisible(Console:PHD44780Console; Visible:Boolean):LongWord;
Description: Set the cursor to visible or not visible


[Expand] 
function HD44780CursorPosition(Console:PHD44780Console; Row,Col:Byte):LongWord;
Description: Set the cursor position to Row, Col


[Expand] 
function HD44780DisplayEnabled(Console:PHD44780Console; Enabled:Boolean):LongWord;
Description: Set the display state to on or off


[Expand] 
function HD44780AddCharacter(Console:PHD44780Console; Location:Byte; Character:THD44780Character):LongWord;
Description: Add a custom character to the display


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