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:
17:652ab113bc2e
Parent:
16:c276b75e6585
Child:
18:bd65dc10f27f
--- a/TextLCD.h	Wed Feb 20 19:37:53 2013 +0000
+++ b/TextLCD.h	Sat Mar 02 16:51:01 2013 +0000
@@ -3,6 +3,7 @@
  *               2013, v01: WH, Added LCD types, fixed LCD address issues, added Cursor and UDCs 
  *               2013, v02: WH, Added I2C and SPI bus interfaces
  *               2013, v03: WH, Added support for LCD40x4 which uses 2 controllers   
+ *               2013, v04: WH, Added support for Display On/Off, improved 4bit bootprocess  
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -85,7 +86,6 @@
 #define D_LCD_BL       (1<<D_LCD_PIN_BL)
 
 
-
 /** Some sample User Defined Chars 5x7 dots */
 const char udc_ae[] = {0x00, 0x00, 0x1B, 0x05, 0x1F, 0x14, 0x1F, 0x00};  //æ
 const char udc_0e[] = {0x00, 0x00, 0x0E, 0x13, 0x15, 0x19, 0x0E, 0x00};  //ø
@@ -150,10 +150,17 @@
 
     /** LCD Cursor control */
     enum LCDCursor {
-        CurOff_BlkOff,  /**<  Cursor Off, Blinking Char Off */    
-        CurOn_BlkOff,   /**<  Cursor On, Blinking Char Off */    
-        CurOff_BlkOn,   /**<  Cursor Off, Blinking Char On */    
-        CurOn_BlkOn,    /**<  Cursor On, Blinking Char On */    
+        CurOff_BlkOff = 0x00,  /**<  Cursor Off, Blinking Char Off */    
+        CurOn_BlkOff  = 0x02,  /**<  Cursor On, Blinking Char Off */    
+        CurOff_BlkOn  = 0x01,  /**<  Cursor Off, Blinking Char On */    
+        CurOn_BlkOn   = 0x03   /**<  Cursor On, Blinking Char On */    
+    };
+
+
+    /** LCD Display control */
+    enum LCDMode {
+        DispOff = 0x00,  /**<  Display Off */    
+        DispOn  = 0x04   /**<  Display On */            
     };
 
 
@@ -242,9 +249,16 @@
 
     /** Set the Cursormode
      *
-     * @param show    The Cursor mode (CurOff_BlkOff, CurOn_BlkOff, CurOff_BlkOn, CurOn_BlkOn)
+     * @param cursorMode  The Cursor mode (CurOff_BlkOff, CurOn_BlkOff, CurOff_BlkOn, CurOn_BlkOn)
      */
-    void setCursor(LCDCursor show);     
+    void setCursor(LCDCursor cursorMode);     
+    
+
+    /** Set the Displaymode
+     *
+     * @param displayMode The Display mode (DispOff, DispOn)
+     */
+    void setMode(TextLCD::LCDMode displayMode);     
 
 
     /** Set User Defined Characters
@@ -277,9 +291,11 @@
     void _initCtrl();    
     int  _address(int column, int row);
     void _setCursor(TextLCD::LCDCursor show);
-    void _setUDC(unsigned char c, char *udc_data);     
+    void _setUDC(unsigned char c, char *udc_data);   
+    void _setCursorAndDisplayMode(TextLCD::LCDMode displayMode, TextLCD::LCDCursor cursorType);       
     
 //Low level write operations to LCD controller
+    void _writeNibble(int value);
     void _writeByte(int value);
     void _writeCommand(int command);
     void _writeData(int data);
@@ -315,6 +331,9 @@
 //Display type
     LCDType _type;
 
+//Display type
+    LCDMode _currentMode;
+
 //Controller select, mainly used for LCD40x4 
     _LCDCtrl _ctrl;