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:
14:0c32b66b14b8
Parent:
13:24506ba22480
Child:
15:b70ebfffb258
--- a/TextLCD.h	Sat Feb 09 15:10:36 2013 +0000
+++ b/TextLCD.h	Sun Feb 10 18:43:51 2013 +0000
@@ -166,7 +166,7 @@
      * @param cs              chip select pin (active low)
      * @param type            Sets the panel size/addressing mode (default = LCD16x2)
      */
-//    TextLCD(SPI *spi, PinName cs, LCDType type = LCD16x2);
+    TextLCD(SPI *spi, PinName cs, LCDType type = LCD16x2);
 
 
 #if DOXYGEN_ONLY
@@ -239,11 +239,11 @@
     void setUDC(unsigned char c, char *udc_data);
 
 protected:
-   /** LCD Bus control */
+   /* LCD Bus control */
     enum _LCDBus {
-        _PinBus,  /**<  Regular mbed pins */    
-        _I2CBus,  /**<  I2C PCF8574 Portexpander */    
-        _SPIBus   /**<  SPI 74595 */    
+        _PinBus,  /*<  Regular mbed pins */    
+        _I2CBus,  /*<  I2C PCF8574 Portexpander */    
+        _SPIBus   /*<  SPI 74595 */    
     };
 
     // Stream implementation functions
@@ -258,7 +258,8 @@
     void _setEnable(bool value);
     void _setRS(bool value);  
     void _setData(int value);
-
+    void _setCS(bool value);
+    
 //Low level writes to LCD serial bus only
     void _writeBus();      
 
@@ -276,8 +277,8 @@
     unsigned char _slaveAddress;
     
 // SPI bus        
-//    SPI *_spi;
-//    DigitalOut _cs;    
+    SPI *_spi;
+    DigitalOut _cs;    
     
 //Bus Interface type    
     _LCDBus _busType;