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:
28:30fa94f7341c
Parent:
27:22d5086f6ba6
Child:
29:a3663151aa65
--- a/TextLCD.h	Fri Jun 13 19:02:26 2014 +0000
+++ b/TextLCD.h	Sat Jun 14 17:04:25 2014 +0000
@@ -52,10 +52,11 @@
  * 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, CS pin, LCD Type  
+ * //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() {
  *   lcd.printf("Hello World!\n");
@@ -68,8 +69,8 @@
 //LCD and serial portexpanders should be wired accordingly 
 //
 //Select Hardware module (one option only)
-#define DEFAULT        0
-#define ADAFRUIT       1
+#define DEFAULT        1
+#define ADAFRUIT       0
 #define DFROBOT        0
 
 
@@ -247,6 +248,15 @@
 //const char udc_bar_4[]  = {0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x00};  // Bar 1111
 //const char udc_bar_5[]  = {0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x00};  // Bar 11111
 
+//const char udc_ch_1[]  =  {0x1f, 0x00, 0x1f, 0x00, 0x1f, 0x00, 0x1f, 0x00};  // Hor bars 4
+//const char udc_ch_2[]  =  {0x00, 0x1f, 0x00, 0x1f, 0x00, 0x1f, 0x00, 0x1f};  // Hor bars 4 (inverted)
+//const char udc_ch_3[]  =  {0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15};  // Ver bars 3
+//const char udc_ch_4[]  =  {0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a};  // Ver bars 3 (inverted)
+//const char udc_ch_yr[] =  {0x08, 0x0f, 0x12, 0x0f, 0x0a, 0x1f, 0x02, 0x02};  // Year   (kanji)
+//const char udc_ch_mo[] =  {0x0f, 0x09, 0x0f, 0x09, 0x0f, 0x09, 0x09, 0x13};  // Month  (kanji)
+//const char udc_ch_dy[] =  {0x1f, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11, 0x1F};  // Day    (kanji)
+//const char udc_ch_mi[] =  {0x0C, 0x0a, 0x11, 0x1f, 0x09, 0x09, 0x09, 0x13};  // minute (kanji)
+
 
 /** A TextLCD interface for driving 4-bit HD44780-based LCDs
  *
@@ -263,10 +273,13 @@
         LCD8x2,     /**<  8x2 LCD panel */          
         LCD8x2B,    /**<  8x2 LCD panel (actually 16x1) */                  
         LCD12x2,    /**< 12x2 LCD panel */                          
+//        LCD12x3,    /**< 12x3 LCD panel, special mode PCF21XX */                                  
         LCD12x4,    /**< 12x4 LCD panel */                  
+//        LCD12x4B,   /**< 12x4 LCD panel, special mode PCF21XX */                                          
         LCD16x1,    /**< 16x1 LCD panel (actually 8x2) */          
         LCD16x2,    /**< 16x2 LCD panel (default) */
         LCD16x2B,   /**< 16x2 LCD panel alternate addressing */
+//        LCD16x3,    /**< 16x3 LCD panel, special mode ST7036 */                
         LCD16x4,    /**< 16x4 LCD panel */        
         LCD20x2,    /**< 20x2 LCD panel */
         LCD20x4,    /**< 20x4 LCD panel */
@@ -278,11 +291,13 @@
 
     /** LCD Controller Device */
     enum LCDCtrl {
-        HD44780,    /**<  HD44780 (default)       */    
-        WS0010,     /**<  WS0010 OLED Controller  */    
-        ST7036,     /**<  ST7036                  */   
-        ST7032_3V3, /**<  ST7032 3V3 with Booster */   
-        ST7032_5V   /**<  ST7032 5V  no Booster   */           
+        HD44780,    /**<  HD44780 (default)        */    
+        WS0010,     /**<  WS0010  OLED Controller  */    
+        ST7036,     /**<  ST7036  3V3 with Booster */   
+        ST7032_3V3, /**<  ST7032  3V3 with Booster */   
+        ST7032_5V   /**<  ST7032  5V no Booster    */           
+//        PCF210X,    /**<  PCF210X 5V no Booster    */                   
+//        PCF211X     /**<  PCF211X 3V3 with Booster */                           
     };
 
 
@@ -639,11 +654,12 @@
     /** Create a TextLCD interface using a controller with native I2C interface
      *
      * @param i2c             I2C Bus
-     * @param deviceAddress   I2C slave address (default = 0x)  
+     * @param deviceAddress   I2C slave address (default = ST7032_SA = 0x7C)  
      * @param type            Sets the panel size/addressing mode (default = LCD16x2)
+     * @param bl              Backlight control line (optional, default = NC)       
      * @param ctrl            LCD controller (default = ST7032_3V3)                     
      */
-    TextLCD_I2C_N(I2C *i2c, char deviceAddress = 0x40, LCDType type = LCD16x2, LCDCtrl ctrl = ST7032_3V3);
+    TextLCD_I2C_N(I2C *i2c, char deviceAddress = ST7032_SA, LCDType type = LCD16x2, PinName bl = NC, LCDCtrl ctrl = ST7032_3V3);
     virtual ~TextLCD_I2C_N(void);
 
 private:
@@ -657,8 +673,10 @@
     I2C *_i2c;
     char _slaveAddress;
     
-// Internal bus mirror value for serial bus only
-    char _lcd_bus;   
+// controlbyte to select between data and command. Internal value for serial bus only
+    char _controlbyte;   
+    
+    DigitalOut *_bl;    
 };
 
 //---------- End TextLCD_I2C_N ------------