Wim Huiskamp / TextLCD

Updated for more display types. Fixed memoryaddress confusion in address() method. Added new getAddress() method. Added support for UDCs, Backlight control and other features such as control through I2C and SPI port expanders and controllers with native I2C and SPI interfaces. Refactored to fix issue with pins that are default declared as NC.

Dependents:   GPSDevice TestTextLCD SD to Flash Data Transfer DrumMachine ... more

Fork of TextLCD by Simon Ford

Example

Hello World! for the TextLCD

#include "mbed.h"
#include "TextLCD.h"
 
// Host PC Communication channels
Serial pc(USBTX, USBRX); // tx, rx
 
// I2C Communication
I2C i2c_lcd(p28,p27); // SDA, SCL
 
// SPI Communication
SPI spi_lcd(p5, NC, p7); // MOSI, MISO, SCLK

//TextLCD lcd(p15, p16, p17, p18, p19, p20);                // RS, E, D4-D7, LCDType=LCD16x2, BL=NC, E2=NC, LCDTCtrl=HD44780
//TextLCD_SPI lcd(&spi_lcd, p8, TextLCD::LCD40x4);   // SPI bus, 74595 expander, CS pin, LCD Type  
TextLCD_I2C lcd(&i2c_lcd, 0x42, TextLCD::LCD20x4);  // I2C bus, PCF8574 Slaveaddress, LCD Type
//TextLCD_I2C lcd(&i2c_lcd, 0x42, TextLCD::LCD16x2, TextLCD::WS0010); // I2C bus, PCF8574 Slaveaddress, LCD Type, Device Type
//TextLCD_SPI_N lcd(&spi_lcd, p8, p9);               // SPI bus, CS pin, RS pin, LCDType=LCD16x2, BL=NC, LCDTCtrl=ST7032_3V3   
//TextLCD_I2C_N lcd(&i2c_lcd, ST7032_SA, TextLCD::LCD16x2, NC, TextLCD::ST7032_3V3); // I2C bus, Slaveaddress, LCD Type, BL=NC, LCDTCtrl=ST7032_3V3  

int main() {
    pc.printf("LCD Test. Columns=%d, Rows=%d\n\r", lcd.columns(), lcd.rows());
    
    for (int row=0; row<lcd.rows(); row++) {
      int col=0;
      
      pc.printf("MemAddr(Col=%d, Row=%d)=0x%02X\n\r", col, row, lcd.getAddress(col, row));      
//      lcd.putc('-');
      lcd.putc('0' + row);      
      
      for (col=1; col<lcd.columns()-1; col++) {    
        lcd.putc('*');
      }
 
      pc.printf("MemAddr(Col=%d, Row=%d)=0x%02X\n\r", col, row, lcd.getAddress(col, row));      
      lcd.putc('+');
        
    }    
    
// Show cursor as blinking character
    lcd.setCursor(TextLCD::CurOff_BlkOn);
 
// Set and show user defined characters. A maximum of 8 UDCs are supported by the HD44780.
// They are defined by a 5x7 bitpattern. 
    lcd.setUDC(0, (char *) udc_0);  // Show |>
    lcd.putc(0);    
    lcd.setUDC(1, (char *) udc_1);  // Show <|
    lcd.putc(1);    

}

Handbook page

More info is here

Diff: TextLCD_Config.h

Revision:
36:9f5f86dfd44a
Parent:
35:311be6444a39
Child:
37:ce348c002929
--- a/TextLCD_Config.h	Fri Oct 10 15:47:56 2014 +0000
+++ b/TextLCD_Config.h	Tue Nov 25 19:21:18 2014 +0000
@@ -2,6 +2,7 @@
  * Copyright (c) 2014, WH
  *               2014, v01: WH, Extracted from TextLCD.h as of v14
  *               2014, v02: WH, Added AC780 support, added I2C expander modules, fixed setBacklight() for inverted logic modules. Fixed bug in LCD_SPI_N define
+ *               2014, v03: WH, Added LCD_SPI_N_3_8 define for ST7070
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,18 +25,17 @@
 #ifndef MBED_TEXTLCDCONFIG_H
 #define MBED_TEXTLCDCONFIG_H
 
-
 //Select hardware interface options to reduce memory footprint (multiple options allowed)
 #define LCD_I2C        1           /* I2C Expander PCF8574/MCP23008 */
 #define LCD_SPI        1           /* SPI Expander SN74595          */
 #define LCD_I2C_N      1           /* Native I2C bus     */
 #define LCD_SPI_N      1           /* Native SPI bus     */
+#define LCD_SPI_N_3_8  1           /* Native SPI bus     */
 #define LCD_SPI_N_3_9  1           /* Native SPI bus     */
 #define LCD_SPI_N_3_10 1           /* Native SPI bus     */
 #define LCD_SPI_N_3_16 1           /* Native SPI bus     */
 #define LCD_SPI_N_3_24 1           /* Native SPI bus     */
 
-
 //Select options to reduce memory footprint (multiple options allowed)
 #define LCD_UDC        1           /* Enable predefined UDC example*/                
 #define LCD_PRINTF     1           /* Enable Stream implementation */