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Text LCD

Table of Contents

  1. Hello World!
  2. Text LCD Library
  3. Different LCD Panel Sizes
  4. Reference

A driver for Text LCD panels using the 4-bit HD4478 driver.

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Hello World!

Hello World code for driving a 16x2 LCD panel:

#include "mbed.h"
#include "TextLCD.h"

TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d0-d3

int main() {
    lcd.printf("Hello World!\n");
}

Text LCD Library

// Constructor
//    rs, e, d0-d3: DigitalOut pins for Instruction/data control line, Enable line (clock), Data lines
//    type:  Sets the panel size/addressing mode

TextLCD(PinName rs, PinName e, PinName d0, PinName d1, PinName d2, PinName d3, LCDType type = LCD16x2);

// Control methods

int putc(int c);
int printf(const char* format, ...);
void locate(int column, int row);
void cls();

Different LCD Panel Sizes

Setting the type field int the TextLCD constructor allows configuration for the different display panel sizes:

TextLCD::LCD16x2     16x2 LCD panel (default) 
TextLCD::LCD16x2B     16x2 LCD panel alternate addressing 
TextLCD::LCD20x2     20x2 LCD panel 
TextLCD::LCD20x4     20x4 LCD panel

Reference

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