Difference between revisions of "Unit HD44780"

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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 instruction constants''' <code> HD44780_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 instruction''' <code> HD44780_* </code></div>
 
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 entry mode set constants''' <code> HD44780_ENTRYMODESET_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 entry mode set''' <code> HD44780_ENTRYMODESET_* </code></div>
 
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 display control constants''' <code> HD44780_DISPLAYCONTROL_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 display control''' <code> HD44780_DISPLAYCONTROL_* </code></div>
 
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 cursor shift constants''' <code> HD44780_CURSORSHIFT_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 cursor shift''' <code> HD44780_CURSORSHIFT_* </code></div>
 
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 function set constants''' <code> HD44780_FUNCTIONSET_* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 function set''' <code> HD44780_FUNCTIONSET_* </code></div>
 
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 row offset constants ''' <code> HD44780_ROW_OFFSETS* </code></div>
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<div style="font-size: 14px; padding-left: 12px;">'''HD44780 row offset''' <code> HD44780_ROW_OFFSETS* </code></div>
 
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'''HD44780 character types'''
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'''HD44780 character'''
  
 
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'''HD44780 console types'''
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'''HD44780 console'''
  
 
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Revision as of 05:20, 24 March 2017

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Description

Hitachi HD44780 LCD controller Driver unit

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


[Expand]
HD44780 specific constants HD44780_CONSOLE_*


[Expand]
HD44780 instruction HD44780_*


[Expand]
HD44780 entry mode set HD44780_ENTRYMODESET_*


[Expand]
HD44780 display control HD44780_DISPLAYCONTROL_*


[Expand]
HD44780 cursor shift HD44780_CURSORSHIFT_*


[Expand]
HD44780 function set HD44780_FUNCTIONSET_*


[Expand]
HD44780 row offset HD44780_ROW_OFFSETS*


Type definitions


HD44780 character

[Expand]

PHD44780Character = ^THD44780Character;

THD44780Character = array[0..7] of Byte;

HD44780 console

[Expand]

PHD44780Console = ^THD44780Console;

THD44780Console = record


Public variables

None defined

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: Implementation of ConsoleDeviceOpen API for HD44780


[Expand] 
function HD44780ConsoleClose(Console:PConsoleDevice):LongWord;
Description: Implementation of ConsoleDeviceClose API for HD44780


[Expand] 
function HD44780ConsoleClear(Console:PConsoleDevice; Color:LongWord):LongWord;
Description: Implementation of ConsoleDeviceClear API for HD44780


[Expand] 
function HD44780ConsoleScroll(Console:PConsoleDevice; X1,Y1,X2,Y2,Count,Direction:LongWord):LongWord;
Description: Implementation of ConsoleDeviceScroll API for HD44780


[Expand] 
function HD44780ConsoleDrawChar(Console:PConsoleDevice; Handle:TFontHandle; Ch:Char; X,Y,Forecolor,Backcolor:LongWord):LongWord;
Description: Implementation of ConsoleDeviceDrawChar API for HD44780


[Expand] 
function HD44780ConsoleDrawText(Console:PConsoleDevice; Handle:TFontHandle; const Text:String; X,Y,Forecolor,Backcolor,Len:LongWord):LongWord;
Description: Implementation of ConsoleDeviceDrawText API for HD44780


[Expand] 
function HD44780ConsoleDrawBlock(Console:PConsoleDevice; X1,Y1,X2,Y2,Color:LongWord):LongWord;
Description: Implementation of ConsoleDeviceDrawBlock API for HD44780


[Expand] 
function HD44780ConsoleDrawWindow(Console:PConsoleDevice; Handle:TWindowHandle):LongWord;
Description: Implementation of ConsoleDeviceDrawWindow API for HD44780


[Expand] 
function HD44780ConsolePutText(Console:PConsoleDevice; Handle:TFontHandle; const Source,Dest:TConsolePoint; Buffer:PConsoleChar; Width,Height,Skip:LongWord):LongWord;
Description: Implementation of ConsoleDevicePutText API for HD44780


[Expand] 
function HD44780ConsoleGetPosition(Console:PConsoleDevice; Position:LongWord; var X1,Y1,X2,Y2:LongWord):LongWord;
Description: Implementation of ConsoleDeviceGetPosition API for HD44780


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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