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:
10:dd9b3a696acd
Parent:
9:0893d986e717
Child:
11:9ec02df863a1
--- a/TextLCD.h	Thu Jan 31 19:46:00 2013 +0000
+++ b/TextLCD.h	Mon Feb 04 21:48:24 2013 +0000
@@ -28,7 +28,7 @@
 
 /** A TextLCD interface for driving 4-bit HD44780-based LCDs
  *
- * Currently supports 8x1, 8x2, 16x2, 16x4, 20x2, 20x4, 24x2 and 40x2 panels
+ * Currently supports 8x1, 8x2, 16x2, 16x4, 20x2, 20x4, 24x2, 24x4 and 40x2 panels
  *
  * @code
  * #include "mbed.h"
@@ -42,6 +42,7 @@
  * @endcode
  */
 
+ 
 class TextLCD : public Stream {
 public:
 
@@ -55,9 +56,17 @@
         LCD20x2,    /**< 20x2 LCD panel */
         LCD20x4,    /**< 20x4 LCD panel */
         LCD24x2,    /**< 24x2 LCD panel */        
+        LCD24x4,    /**< 24x4 LCD panel, special mode KS0078 */                
         LCD40x2     /**< 40x2 LCD panel */                
     };
 
+    /** LCD Cursor control */
+    enum LCDCursor {
+        CurOn,
+        CurOff
+    };
+
+
     /** Create a TextLCD interface
      *
      * @param rs    Instruction/data control line
@@ -89,17 +98,46 @@
      */
     void locate(int column, int row);
 
+
+    /** Return the memoryaddress of screen column and row location
+     *
+     * @param column  The horizontal position from the left, indexed from 0
+     * @param row     The vertical position from the top, indexed from 0
+     * @param return  The memoryaddress of screen column and row location
+     */
     int  getAddress(int column, int row);    
+    
+    
+    /** Set the memoryaddress of screen column and row location
+     *
+     * @param column  The horizontal position from the left, indexed from 0
+     * @param row     The vertical position from the top, indexed from 0
+     */
     void setAddress(int column, int row);        
 
+    /** Set the Cursormode
+     *
+     * @param show    The Cursor mode (CurOn or CurOff)
+     * @param return  The current Cursor mode     
+     */
+    LCDCursor cursor(LCDCursor show);     
+
     /** Clear the screen and locate to 0,0 */
     void cls();
 
+    /** Return the number of rows
+     *
+     * @param return  The number of rows
+     */
     int rows();
-    int columns();
+    
+    /** Return the number of columns
+     *
+     * @param return  The number of columns
+     */  
+    int columns();  
 
 protected:
-
     // Stream implementation functions
     virtual int _putc(int value);
     virtual int _getc();
@@ -116,6 +154,7 @@
 
     int _column;
     int _row;
+    LCDCursor _cursor;    
 };
 
 #endif