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:
23:d47f226efb24
Parent:
22:35742ec80c24
Child:
24:fb3399713710
diff -r 35742ec80c24 -r d47f226efb24 TextLCD.h
--- a/TextLCD.h	Wed Apr 02 17:49:55 2014 +0000
+++ b/TextLCD.h	Wed Apr 02 18:16:37 2014 +0000
@@ -365,11 +365,11 @@
     LCDCursor _currentCursor;    
 };
 
-///--------- End TextLCD_Base -----------
+//--------- End TextLCD_Base -----------
 
 
 
-///--------- Start TextLCD Bus -----------
+//--------- Start TextLCD Bus -----------
 
 /** Create a TextLCD interface for using regular mbed pins
   *
@@ -415,10 +415,10 @@
 };
 
     
-///----------- End TextLCD ---------------
+//----------- End TextLCD ---------------
 
 
-///--------- Start TextLCD_I2C -----------
+//--------- Start TextLCD_I2C -----------
 
 
 /** Create a TextLCD interface using an I2C PC8574 or PCF8574A portexpander
@@ -452,11 +452,11 @@
 };
 
 
-///---------- End TextLCD_I2C ------------
+//---------- End TextLCD_I2C ------------
 
 
 
-///--------- Start TextLCD_SPI -----------
+//--------- Start TextLCD_SPI -----------
 
 
 /** Create a TextLCD interface using an SPI 74595 portexpander
@@ -494,6 +494,6 @@
 
 };
 
-///---------- End TextLCD_SPI ------------
+//---------- End TextLCD_SPI ------------
 
 #endif