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.h

Revision:
8:03116f75b66e
Parent:
7:44f34c09bd37
Child:
9:0893d986e717
--- a/TextLCD.h	Sat Dec 04 11:29:57 2010 +0000
+++ b/TextLCD.h	Tue Jan 29 20:49:33 2013 +0000
@@ -1,5 +1,6 @@
 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
  * Copyright (c) 2007-2010, sford, http://mbed.org
+ *               2013, WH, Updated LCD types and fixed lcd address issues
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -27,7 +28,7 @@
 
 /** A TextLCD interface for driving 4-bit HD44780-based LCDs
  *
- * Currently supports 16x2, 20x2 and 20x4 panels
+ * Currently supports 8x1, 8x2, 16x2, 16x4, 20x2, 20x4 and 24x2 panels
  *
  * @code
  * #include "mbed.h"
@@ -40,15 +41,20 @@
  * }
  * @endcode
  */
+
 class TextLCD : public Stream {
 public:
 
     /** LCD panel format */
     enum LCDType {
-        LCD16x2     /**< 16x2 LCD panel (default) */
-        , LCD16x2B  /**< 16x2 LCD panel alternate addressing */
-        , LCD20x2   /**< 20x2 LCD panel */
-        , LCD20x4   /**< 20x4 LCD panel */
+        LCD8x1,     /**<  8x1 LCD panel */    
+        LCD8x2,     /**<  8x2 LCD panel */            
+        LCD16x2,    /**< 16x2 LCD panel (default) */
+        LCD16x2B,   /**< 16x2 LCD panel alternate addressing */
+        LCD16x4,    /**< 16x4 LCD panel */        
+        LCD20x2,    /**< 20x2 LCD panel */
+        LCD20x4,    /**< 20x4 LCD panel */
+        LCD24x2     /**< 24x2 LCD panel */        
     };
 
     /** Create a TextLCD interface
@@ -94,7 +100,9 @@
     virtual int _putc(int value);
     virtual int _getc();
 
-    int address(int column, int row);
+    int  address(int column, int row);
+    int  getAddress(int column, int row);    
+    void setAddress(int column, int row);        
     void character(int column, int row, int c);
     void writeByte(int value);
     void writeCommand(int command);