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

Files at this revision

API Documentation at this revision

Comitter:
wim
Date:
Thu Jan 31 19:46:00 2013 +0000
Parent:
8:03116f75b66e
Child:
10:dd9b3a696acd
Commit message:
Tested on several LCD types

Changed in this revision

TextLCD.cpp Show annotated file Show diff for this revision Revisions of this file
TextLCD.h Show annotated file Show diff for this revision Revisions of this file
--- a/TextLCD.cpp	Tue Jan 29 20:49:33 2013 +0000
+++ b/TextLCD.cpp	Thu Jan 31 19:46:00 2013 +0000
@@ -192,6 +192,7 @@
         case LCD16x2:
         case LCD20x2:
         case LCD24x2:        
+        case LCD40x2:                
             return 0x00 + (row * 0x40) + column;
             
 // Should never get here.
@@ -229,6 +230,9 @@
 
         case LCD24x2:
             return 24;        
+
+        case LCD40x2:
+            return 40;        
         
 // Should never get here.
         default:
@@ -246,6 +250,7 @@
         case LCD16x2B:
         case LCD20x2:
         case LCD24x2:        
+        case LCD40x2:                
             return 2;
                     
         case LCD16x4:
--- a/TextLCD.h	Tue Jan 29 20:49:33 2013 +0000
+++ b/TextLCD.h	Thu Jan 31 19:46:00 2013 +0000
@@ -28,7 +28,7 @@
 
 /** A TextLCD interface for driving 4-bit HD44780-based LCDs
  *
- * Currently supports 8x1, 8x2, 16x2, 16x4, 20x2, 20x4 and 24x2 panels
+ * Currently supports 8x1, 8x2, 16x2, 16x4, 20x2, 20x4, 24x2 and 40x2 panels
  *
  * @code
  * #include "mbed.h"
@@ -54,7 +54,8 @@
         LCD16x4,    /**< 16x4 LCD panel */        
         LCD20x2,    /**< 20x2 LCD panel */
         LCD20x4,    /**< 20x4 LCD panel */
-        LCD24x2     /**< 24x2 LCD panel */        
+        LCD24x2,    /**< 24x2 LCD panel */        
+        LCD40x2     /**< 40x2 LCD panel */                
     };
 
     /** Create a TextLCD interface
@@ -88,6 +89,9 @@
      */
     void locate(int column, int row);
 
+    int  getAddress(int column, int row);    
+    void setAddress(int column, int row);        
+
     /** Clear the screen and locate to 0,0 */
     void cls();
 
@@ -101,8 +105,6 @@
     virtual int _getc();
 
     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);