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_Config.h

Revision:
35:311be6444a39
Parent:
34:e5a0dcb43ecc
Child:
36:9f5f86dfd44a
--- a/TextLCD_Config.h	Sat Sep 27 12:38:27 2014 +0000
+++ b/TextLCD_Config.h	Fri Oct 10 15:47:56 2014 +0000
@@ -1,6 +1,7 @@
 /* mbed TextLCD Library, for a 4-bit LCD based on HD44780
  * Copyright (c) 2014, WH
  *               2014, v01: WH, Extracted from TextLCD.h as of v14
+ *               2014, v02: WH, Added AC780 support, added I2C expander modules, fixed setBacklight() for inverted logic modules. Fixed bug in LCD_SPI_N define
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -28,11 +29,12 @@
 #define LCD_I2C        1           /* I2C Expander PCF8574/MCP23008 */
 #define LCD_SPI        1           /* SPI Expander SN74595          */
 #define LCD_I2C_N      1           /* Native I2C bus     */
+#define LCD_SPI_N      1           /* Native SPI bus     */
 #define LCD_SPI_N_3_9  1           /* Native SPI bus     */
 #define LCD_SPI_N_3_10 1           /* Native SPI bus     */
 #define LCD_SPI_N_3_16 1           /* Native SPI bus     */
 #define LCD_SPI_N_3_24 1           /* Native SPI bus     */
-#define LCD_SPI_N_4    1           /* Native SPI bus     */
+
 
 //Select options to reduce memory footprint (multiple options allowed)
 #define LCD_UDC        1           /* Enable predefined UDC example*/                
@@ -45,6 +47,9 @@
 #define DEFAULT        1
 #define ADAFRUIT       0
 #define DFROBOT        0
+#define YWROBOT        0
+#define GYLCD          0
+#define SYDZ           0
 
 //Select Hardware module (one option only)
 #if (DEFAULT==1)
@@ -69,11 +74,15 @@
 //Select I2C Portexpander type (one option only)
 #define PCF8574        1
 #define MCP23008       0
+
+//Inverted Backlight control
+#define BACKLIGHT_INV  0
 #endif
 
 #if (ADAFRUIT==1)
 //Definitions for Adafruit i2cspilcdbackpack mapping between serial port expander pins and LCD controller
 //This hardware supports both an I2C expander (MCP23008) and an SPI expander (74595) selectable by a jumper.
+//Slaveaddress may be set by solderbridges (default 0x40). SDA/SCL has pullup Resistors onboard.
 //See http://www.ladyada.net/products/i2cspilcdbackpack
 //
 //Note: LCD RW pin must be kept LOW
@@ -93,15 +102,53 @@
 //Force I2C portexpander type
 #define PCF8574        0
 #define MCP23008       1
+
+//Inverted Backlight control
+#define BACKLIGHT_INV  0
 #endif
 
 #if (DFROBOT==1)
 //Definitions for DFROBOT LCD2004 Module mapping between serial port expander pins and LCD controller
 //This hardware uses PCF8574 and is different from earlier/different Arduino I2C LCD displays
+//Slaveaddress hardwired to 0x4E. SDA/SCL has pullup Resistors onboard.
+//See http://arduino-info.wikispaces.com/LCD-Blue-I2C
+//
+//Definitions for DFROBOT V1.1 
+//This hardware uses PCF8574. Slaveaddress may be set by jumpers (default 0x40).
+//SDA/SCL has pullup Resistors onboard and features a voltage level converter 3V3 <-> 5V.
+//See http://www.dfrobot.com/index.php?route=product/product&product_id=135
+//
+//
+//Note: LCD RW pin must be kept LOW
+//      E2 is not available on default Arduino hardware and so it does not support LCD40x4 (second controller)
+//      BL is used to control backlight
+#define D_LCD_PIN_RS   0
+#define D_LCD_PIN_RW   1
+#define D_LCD_PIN_E    2
+#define D_LCD_PIN_BL   3
+#define D_LCD_PIN_D4   4
+#define D_LCD_PIN_D5   5
+#define D_LCD_PIN_D6   6
+#define D_LCD_PIN_D7   7
+
+#define D_LCD_PIN_E2   D_LCD_PIN_RW
+
+//Force I2C portexpander type
+#define PCF8574        1
+#define MCP23008       0
+
+//Inverted Backlight control
+#define BACKLIGHT_INV  0
+#endif
+
+#if (YWROBOT==1)
+//Definitions for YWROBOT LCM1602 V1 Module mapping between serial port expander pins and LCD controller. 
+//Very similar to DFROBOT. This hardware uses PCF8574.
+//Slaveaddress may be set by solderbridges (default 0x4E). SDA/SCL has no pullup Resistors onboard.
 //See http://arduino-info.wikispaces.com/LCD-Blue-I2C
 //
 //Note: LCD RW pin must be kept LOW
-//      E2 is not available on default Arduino hardware and so it does not support LCD40x4 (second controller)
+//      E2 is not available on default hardware and so it does not support LCD40x4 (second controller)
 //      BL is used to control backlight, reverse logic: Low turns on Backlight. This is handled in setBacklight()
 #define D_LCD_PIN_RS   0
 #define D_LCD_PIN_RW   1
@@ -117,8 +164,66 @@
 //Force I2C portexpander type
 #define PCF8574        1
 #define MCP23008       0
+
+//Inverted Backlight control
+#define BACKLIGHT_INV  0
 #endif
 
+#if (GYLCD==1)
+//Definitions for Arduino-IIC-LCD GY-LCD-V1 Module mapping between serial port expander pins and LCD controller. 
+//Very similar to DFROBOT. This hardware uses PCF8574.
+//Slaveaddress may be set by solderbridges (default 0x4E). SDA/SCL has pullup Resistors onboard.
+//See http://arduino-info.wikispaces.com/LCD-Blue-I2C
+//
+//Note: LCD RW pin must be kept LOW
+//      E2 is not available on default hardware and so it does not support LCD40x4 (second controller)
+//      BL is used to control backlight, reverse logic: Low turns on Backlight. This is handled in setBacklight()
+#define D_LCD_PIN_D4   0
+#define D_LCD_PIN_D5   1
+#define D_LCD_PIN_D6   2
+#define D_LCD_PIN_D7   3
+#define D_LCD_PIN_EN   4
+#define D_LCD_PIN_RW   5
+#define D_LCD_PIN_RS   6
+#define D_LCD_PIN_BL   7
+
+#define D_LCD_PIN_E2   D_LCD_PIN_RW
+
+//Force I2C portexpander type
+#define PCF8574        1
+#define MCP23008       0
+
+//Force Inverted Backlight control
+#define BACKLIGHT_INV  1
+#endif
+
+#if (SYDZ==1)
+//Definitions for SYDZ Module mapping between serial port expander pins and LCD controller. 
+//Very similar to DFROBOT. This hardware uses PCF8574A and uses inverted Backlight control
+//Slaveaddress may be set by switches (default 0x40). SDA/SCL has pullup Resistors onboard.
+//See ebay
+//
+//Note: LCD RW pin must be kept LOW
+//      E2 is not available on default hardware and so it does not support LCD40x4 (second controller)
+//      BL is used to control backlight, reverse logic: Low turns on Backlight. This is handled in setBacklight()
+#define D_LCD_PIN_RS   0
+#define D_LCD_PIN_RW   1
+#define D_LCD_PIN_E    2
+#define D_LCD_PIN_BL   3
+#define D_LCD_PIN_D4   4
+#define D_LCD_PIN_D5   5
+#define D_LCD_PIN_D6   6
+#define D_LCD_PIN_D7   7
+
+#define D_LCD_PIN_E2   D_LCD_PIN_RW
+
+//Force I2C portexpander type
+#define PCF8574        1
+#define MCP23008       0
+
+//Force Inverted Backlight control
+#define BACKLIGHT_INV  1
+#endif
 
 //Bitpattern Defines for I2C PCF8574/PCF8574A, MCP23008 and SPI 74595 Bus expanders
 //