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:
19:c747b9e2e7b8
Parent:
18:bd65dc10f27f
Child:
20:e0da005a777f
--- a/TextLCD.h	Sat Mar 09 19:39:53 2013 +0000
+++ b/TextLCD.h	Fri Apr 19 19:36:37 2013 +0000
@@ -5,6 +5,7 @@
  *               2013, v03: WH, Added support for LCD40x4 which uses 2 controllers   
  *               2013, v04: WH, Added support for Display On/Off, improved 4bit bootprocess  
  *               2013, v05: WH, Added support for 8x2B, added some UDCs  
+ *               2013, v06: WH, Added support for devices that use internal DC/DC converters 
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -35,6 +36,7 @@
  *
  * Currently supports 8x1, 8x2, 12x4, 16x1, 16x2, 16x4, 20x2, 20x4, 24x2, 24x4, 40x2 and 40x4 panels
  * Interface options include direct mbed pins, I2C portexpander (PCF8474) or SPI bus shiftregister (74595)
+ * Supports some controllers that provide internal DC/DC converters for VLCD or VLED. 
  *
  * @code
  * #include "mbed.h"
@@ -49,6 +51,7 @@
  * TextLCD lcd(p15, p16, p17, p18, p19, p20);     // RS, E, D4-D7, LCDType=LCD16x2
  * //TextLCD lcd(&spi_lcd, p8, TextLCD::LCD40x4);   // SPI bus, CS pin, LCD Type  
  * //TextLCD lcd(&i2c_lcd, 0x42, TextLCD::LCD20x4); // I2C bus, PCF8574 Slaveaddress, LCD Type
+ * //TextLCD lcd(&i2c_lcd, 0x42, TextLCD::LCD16x2, TextLCD::WS0010); // I2C bus, PCF8574 Slaveaddress, LCD Type, Device Type
  * 
  * int main() {
  *   lcd.printf("Hello World!\n");
@@ -157,6 +160,14 @@
         LCD40x4     /**< 40x4 LCD panel, Two controller version */                        
     };
 
+    /** LCD Controller Device */
+    enum LCDCtrl {
+        HD44780,    /**<  HD44780 (default)      */    
+        WS0010,     /**<  WS0010 OLED Controller */    
+        ST7063      /**<  ST7063                 */    
+    };
+
+
     /** LCD Cursor control */
     enum LCDCursor {
         CurOff_BlkOff = 0x00,  /**<  Cursor Off, Blinking Char Off */    
@@ -179,17 +190,19 @@
      * @param e     Enable line (clock)
      * @param d4-d7 Data lines for using as a 4-bit interface
      * @param type  Sets the panel size/addressing mode (default = LCD16x2)
-     * @param e2    Enable2 line (clock for second controller, LCD40x4 only)      
+     * @param e2    Enable2 line (clock for second controller, LCD40x4 only)  
+     * @param ctrl  LCD controller (default = HD44780)           
      */
-    TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2, PinName e2 = NC);
+    TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2, PinName e2 = NC, LCDCtrl ctrl = HD44780);
     
     /** Create a TextLCD interface using an I2C PC8574 portexpander
      *
      * @param i2c             I2C Bus
      * @param deviceAddress   I2C slave address (PCF8574)
      * @param type            Sets the panel size/addressing mode (default = LCD16x2)
+     * @param ctrl            LCD controller (default = HD44780)                
      */
-    TextLCD(I2C *i2c, char deviceAddress, LCDType type = LCD16x2);
+    TextLCD(I2C *i2c, char deviceAddress, LCDType type = LCD16x2, LCDCtrl ctrl = HD44780);
 
 
     /** Create a TextLCD interface using an SPI 74595 portexpander
@@ -197,8 +210,9 @@
      * @param spi             SPI Bus
      * @param cs              chip select pin (active low)
      * @param type            Sets the panel size/addressing mode (default = LCD16x2)
+     * @param ctrl            LCD controller (default = HD44780)                     
      */
-    TextLCD(SPI *spi, PinName cs, LCDType type = LCD16x2);
+    TextLCD(SPI *spi, PinName cs, LCDType type = LCD16x2, LCDCtrl ctrl = HD44780);
 
 
 #if DOXYGEN_ONLY
@@ -286,7 +300,7 @@
     };
 
    /* LCD controller select, mainly used for LCD40x4 */
-    enum _LCDCtrl {
+    enum _LCDCtrl_Idx {
         _LCDCtrl_0,  /*<  Primary */    
         _LCDCtrl_1,  /*<  Secondary */            
     };
@@ -343,8 +357,11 @@
 //Display type
     LCDMode _currentMode;
 
+//Controller type 
+    LCDCtrl _ctrl;    
+
 //Controller select, mainly used for LCD40x4 
-    _LCDCtrl _ctrl;    
+    _LCDCtrl_Idx _ctrl_idx;    
 
 // Cursor
     int _column;