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:
25:6162b31128c9
Parent:
24:fb3399713710
Child:
26:bd897a001012
--- a/TextLCD.h	Sat May 10 13:50:25 2014 +0000
+++ b/TextLCD.h	Sat May 10 21:34:51 2014 +0000
@@ -8,6 +8,7 @@
  *               2013, v06: WH, Added support for devices that use internal DC/DC converters 
  *               2013, v07: WH, Added support for backlight and include portdefinitions for LCD2004 Module from DFROBOT
  *               2014, v08: WH, Refactored in Base and Derived Classes to deal with mbed lib change regarding 'NC' defined DigitalOut pins
+ *               2014, v09: WH/EO, Added Class for Native SPI controllers such as ST7032 
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -54,6 +55,7 @@
  * //TextLCD_SPI lcd(&spi_lcd, p8, TextLCD::LCD40x4);                    // SPI bus, 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   
  * 
  * int main() {
  *   lcd.printf("Hello World!\n");
@@ -501,12 +503,12 @@
 //--------- Start TextLCD_NativeSPI -----------
 
 
-/** Create a TextLCD interface with direct SPI access to the controller
+/** Create a TextLCD interface using a controller with native SPI interface
   *
   */
-class TextLCD_NativeSPI : public TextLCD_Base {    
+class TextLCD_SPI_N : public TextLCD_Base {    
 public:
-    /** Create a TextLCD interface using an SPI 74595 portexpander
+    /** Create a TextLCD interface using a controller with native SPI interface
      *
      * @param spi             SPI Bus
      * @param cs              chip select pin (active low)
@@ -515,8 +517,8 @@
      * @param bl              Backlight control line (optional, default = NC)  
      * @param ctrl            LCD controller (default = ST7032)                     
      */
-    TextLCD_NativeSPI(SPI *spi, PinName cs, PinName rs, LCDType type = LCD16x2, PinName bl = NC, LCDCtrl ctrl = ST7032);
-    virtual ~TextLCD_NativeSPI(void);
+    TextLCD_SPI_N(SPI *spi, PinName cs, PinName rs, LCDType type = LCD16x2, PinName bl = NC, LCDCtrl ctrl = ST7032);
+    virtual ~TextLCD_SPI_N(void);
 
 private:
     virtual void _setEnable(bool value);
@@ -533,6 +535,6 @@
 
 };
 
-//---------- End TextLCD_NativeSPI ------------
+//---------- End TextLCD_SPI_N ------------
 
 #endif