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:
9:0893d986e717
Parent:
8:03116f75b66e
Child:
10:dd9b3a696acd
diff -r 03116f75b66e -r 0893d986e717 TextLCD.h
--- 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);