Lcd Library

mikroPascal PRO for FT90x provides a library for communication with Lcds (with HD44780 compliant controllers) through the 4-bit interface.

For creating a set of custom Lcd characters use Lcd Custom Character Tool.

Library Dependency Tree

Lcd Library Dependency Tree

External dependencies of Lcd Library

The following variables must be defined in all projects using Lcd Library : Description : Example :
var LCD_RS : sbit; sfr; external; Register Select line. var LCD_RS : sbit at GPIO_PIN13_bit;
var LCD_EN : sbit; sfr; external; Enable line. var LCD_EN : sbit at GPIO_PIN18_bit;
var LCD_D4 : sbit; sfr; external; Data 4 line. var LCD_D4 : sbit at GPIO_PIN51_bit;
var LCD_D5 : sbit; sfr; external; Data 5 line. var LCD_D5 : sbit at GPIO_PIN44_bit;
var LCD_D6 : sbit; sfr; external; Data 6 line. var LCD_D6 : sbit at GPIO_PIN35_bit;
var LCD_D7 : sbit; sfr; external; Data 7 line. var LCD_D7 : sbit at GPIO_PIN26_bit;

Library Routines

Lcd_Init

Prototype

procedure Lcd_Init();

Description

Initializes Lcd module.

Parameters

None.

Returns

Nothing.

Requires

External dependencies of the library from the top of the page must be defined before using this function.

Example
// LCD module connections
var LCD_RS : sbit at GPIO_PIN13_bit;
var LCD_EN : sbit at GPIO_PIN18_bit;
var LCD_D4 : sbit at GPIO_PIN51_bit;
var LCD_D5 : sbit at GPIO_PIN44_bit;
var LCD_D6 : sbit at GPIO_PIN35_bit;
var LCD_D7 : sbit at GPIO_PIN26_bit;
// End LCD module connections
...
Lcd_Init();                              // Initialize LCD
Notes

None.

Lcd_Out

Prototype

procedure Lcd_Out(row, column: word; var text: string);

Description

Prints text on Lcd starting from specified position. Both string variables and literals can be passed as a text.

Parameters
  • row: starting position row number
  • column: starting position column number
  • text: text to be written
Returns

Nothing.

Requires

The Lcd module needs to be initialized. See Lcd_Init routine.

Example
// Write text "Hello!" on Lcd starting from row 1, column 3:
Lcd_Out(1, 3, 'Hello!');
Notes

None.

Lcd_Out_Cp

Prototype

procedure Lcd_Out_Cp(var text: string);

Returns

Nothing.

Description

Prints text on Lcd at current cursor position. Both string variables and literals can be passed as a text.

Parameters
  • text: text to be written
Requires

The Lcd module needs to be initialized. See Lcd_Init routine.

Example
// Write text "Here!" at current cursor position:
Lcd_Out_Cp('Here!');
Notes

None.

Lcd_Chr

Prototype

procedure Lcd_Chr(row, column: word, out_char: byte);

Description

Prints character on Lcd at specified position. Both variables and literals can be passed as a character.

Parameters
  • row: writing position row number
  • column: writing position column number
  • out_char: character to be written
Returns

Nothing.

Requires

The Lcd module needs to be initialized. See Lcd_Init routine.

Example
// Write character "i" at row 2, column 3:
Lcd_Chr(2, 3, 'i');
Notes

None.

Lcd_Chr_Cp

Prototype

procedure Lcd_Chr_Cp(out_char: byte);

Description

Prints character on Lcd at current cursor position. Both variables and literals can be passed as a character.

Parameters
  • out_char: character to be written
Returns

Nothing.

Requires

The Lcd module needs to be initialized. See Lcd_Init routine.

Example
// Write character "e" at current cursor position:
Lcd_Chr_Cp('e');
Notes

None.

Lcd_Cmd

Prototype

procedure Lcd_Cmd(out_char: byte);

Description

Sends command to Lcd.

Parameters
  • out_char: command to be sent
Returns

Nothing.

Requires

The Lcd module needs to be initialized. See Lcd_Init table.

Example
// Clear Lcd display:
Lcd_Cmd(_LCD_CLEAR);
Notes

Predefined constants can be passed to the function, see Available Lcd Commands.

Available Lcd Commands

Lcd Command Purpose
_LCD_FIRST_ROW Move cursor to the 1st row
_LCD_SECOND_ROW Move cursor to the 2nd row
_LCD_THIRD_ROW Move cursor to the 3rd row
_LCD_FOURTH_ROW Move cursor to the 4th row
_LCD_CLEAR Clear display
_LCD_RETURN_HOME Return cursor to home position, returns a shifted display to its original position. Display data RAM is unaffected.
_LCD_CURSOR_OFF Turn off cursor
_LCD_UNDERLINE_ON Underline cursor on
_LCD_BLINK_CURSOR_ON Blink cursor on
_LCD_MOVE_CURSOR_LEFT Move cursor left without changing display data RAM
_LCD_MOVE_CURSOR_RIGHT Move cursor right without changing display data RAM
_LCD_TURN_ON Turn Lcd display on
_LCD_TURN_OFF Turn Lcd display off
_LCD_SHIFT_LEFT Shift display left without changing display data RAM
_LCD_SHIFT_RIGHT Shift display right without changing display data RAM
Copyright (c) 2002-2015 mikroElektronika. All rights reserved.
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