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

main.cpp

Committer:
simon
Date:
2010-05-27
Revision:
1:ac48b187213c

File content as of revision 1:ac48b187213c:

// Write to all HD44780 TextLCD RAM locations, sford
//
// A quick hack to write to all the display RAM locations
// in an HD44780 display, to identify which location maps
// to which character.
//
// Instructions:
//  - Change TextLCD pinout as appropriate so it works
//  - Run, and it should fill the screen with characters
//  - Identify what characters are at the start of each row
//
// To determine what address each line starts at, you subtract the 
// ascii code for '0'(48) from the character at the start of each line
//  - see http://www.asciitable.com/
// 
// e.g.
//   +----------------+
//   |0123456789:;<=>?| first char = '0' (48)
//   |XYZ....         | first char = 'X' (88)
//   +----------------+
//  
// So in this case, the RAM offsets are 0 and 40

#include "mbed.h"
#include "TextLCD.h"
DigitalOut zero(p11);
TextLCD lcd(p10, p12, p15, p16, p29, p30, TextLCD::LCD16x2B);

int main() {
    lcd.printf("hithere");
    wait(1);
    lcd.putc('i');
    wait(1);
    lcd.cls();
    wait(1);
    lcd.locate(4, 1);    
    wait(1);
    lcd.printf("jdlkjfksj");
    for(int i=0; i<30; i++) {
        lcd.putc('A' + i);
        wait(0.3);
    }
}