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_UDC.inc

Revision:
38:cbe275b0b647
Parent:
37:ce348c002929
Child:
39:e9c2319de9c5
--- a/TextLCD_UDC.inc	Sun Mar 29 13:08:03 2015 +0000
+++ b/TextLCD_UDC.inc	Sat Apr 18 11:33:02 2015 +0000
@@ -1,6 +1,7 @@
 /* mbed TextLCD Library, for LCDs based on HD44780 controllers
  * Copyright (c) 2014, WH
  *               2014, v01: WH, Extracted from TextLCD.cpp as of v14
+ *               2015, v02: WH, Added some UDC definitions and commented out several UDCs
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -63,10 +64,10 @@
 const char udc_6[]  = {0x15, 0x0a, 0x15, 0x0a, 0x15, 0x0a, 0x15, 0x00};  // checkerboard
 const char udc_7[]  = {0x10, 0x08, 0x04, 0x02, 0x01, 0x00, 0x10, 0x00};  // \
 
-const char udc_degr[]   = {0x06, 0x09, 0x09, 0x06, 0x00, 0x00, 0x00, 0x00};  // Degree symbol
+//const char udc_degr[]   = {0x06, 0x09, 0x09, 0x06, 0x00, 0x00, 0x00, 0x00};  // Degree symbol
 
-const char udc_TM_T[]   = {0x1F, 0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x00};  // Trademark T
-const char udc_TM_M[]   = {0x11, 0x1B, 0x15, 0x11, 0x00, 0x00, 0x00, 0x00};  // Trademark M
+//const char udc_TM_T[]   = {0x1F, 0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x00};  // Trademark T
+//const char udc_TM_M[]   = {0x11, 0x1B, 0x15, 0x11, 0x00, 0x00, 0x00, 0x00};  // Trademark M
 
 //const char udc_Bat_Hi[] = {0x0E, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x00};  // Battery Full
 //const char udc_Bat_Ha[] = {0x0E, 0x11, 0x13, 0x17, 0x1F, 0x1F, 0x1F, 0x00};  // Battery Half
@@ -79,7 +80,7 @@
 const char udc_Bat_Lo[] = {0x8E, 0x91, 0x91, 0x91, 0x91, 0x9F, 0x9F, 0x00};  // Battery Low, Blink
 const char udc_AC[]     = {0x0A, 0x0A, 0x1F, 0x11, 0x0E, 0x04, 0x04, 0x00};  // AC Power
 
-const char udc_smiley[] = {0x00, 0x0A, 0x00, 0x04, 0x11, 0x0E, 0x00, 0x00};  // Smiley
+//const char udc_smiley[] = {0x00, 0x0A, 0x00, 0x04, 0x11, 0x0E, 0x00, 0x00};  // Smiley
 //const char udc_droopy[] = {0x00, 0x0A, 0x00, 0x04, 0x00, 0x0E, 0x11, 0x00};  // Droopey
 //const char udc_note[]   = {0x01, 0x03, 0x05, 0x09, 0x0B, 0x1B, 0x18, 0x00};  // Note
 
@@ -98,15 +99,17 @@
 //const char udc_ch_dy[] =  {0x1f, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11, 0x1F};  // Day    (kana)
 //const char udc_ch_mi[] =  {0x0C, 0x0a, 0x11, 0x1f, 0x09, 0x09, 0x09, 0x13};  // minute (kana)
 
-//const char udc_bell[]     = {0x04,0x0E,0x0E,0x0E,0x1F,0x00,0x04};
-//const char udc_note[]     = {0x02,0x03,0x02,0x0E,0x1E,0x0C,0x00};
-//const char udc_clock[]    = {0x00,0x0E,0x15,0x17,0x11,0x0E,0x00};
-//const char udc_heart[]    = {0x00,0x0a,0x1F,0x1F,0x0E,0x04,0x00};
-//const char udc_duck[]     = {0x00,0x0c,0x1D,0x0F,0x0F,0x06,0x00};
-//const char udc_check[]    = {0x00,0x01,0x03,0x16,0x1C,0x08,0x00};
-//const char udc_cross[]    = {0x00,0x1B,0x0E,0x04,0x0E,0x1B,0x00};
-//const char udc_retarrow[] = {0x01,0x01,0x05,0x09,0x1f,0x08,0x04};
+//const char udc_bell[]     = {0x04, 0x0E, 0x0E, 0x0E, 0x1F, 0x00, 0x04, 0x00};
+//const char udc_note[]     = {0x02, 0x03, 0x02, 0x0E, 0x1E, 0x0C, 0x00, 0x00};
+//const char udc_clock[]    = {0x00, 0x0E, 0x15, 0x17, 0x11, 0x0E, 0x00, 0x00};
+//const char udc_heart[]    = {0x00, 0x0a, 0x1F, 0x1F, 0x0E, 0x04, 0x00, 0x00};
+//const char udc_duck[]     = {0x00, 0x0c, 0x1D, 0x0F, 0x0F, 0x06, 0x00, 0x00};
+//const char udc_check[]    = {0x00, 0x01, 0x03, 0x16, 0x1C, 0x08, 0x00, 0x00};
+//const char udc_cross[]    = {0x00, 0x1B, 0x0E, 0x04, 0x0E, 0x1B, 0x00, 0x00};
+//const char udc_retarrow[] = {0x01, 0x01, 0x05, 0x09, 0x1f, 0x08, 0x04, 0x00};
+//const char udc_OK[]       = {0x08, 0x14, 0x14, 0x08, 0x05, 0x06, 0x05, 0x05};  // OK
+//const char udc_1_2[]      = {0x11, 0x12, 0x17, 0x09, 0x13, 0x04, 0x07, 0x00};  // 1/2
 
-const char udc_None[]    =  {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 
-const char udc_All[]     =  {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; 
+//const char udc_None[]       = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; 
+//const char udc_All[]        = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; 
 #endif /* UDC_EXAMPLES */