A TextLCD interface for driving 4-bit 16x2 KS0066U LCD
Dependents: KS0066U4_16x2 LAB05_Oppgave4 LAB05_Oppgave2 LAB05_Oppgave3 ... more
Import library
Public Member Functions |
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TextLCD (PinName rs, PinName rw, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, const char *name=NULL) | |
Create a
TextLCD
interface and initiated 16x2 char mode.
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void | lcdComand (unsigned char cmd) |
Writes a Command to the LCD-module.
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void | lcdData (unsigned char data) |
Writes charecters to the LCD display.
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void | gotoxy (int, int) |
moves text cursor to a screen column and row
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int | putc (int c) |
Write a character to the LCD.
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int | printf (const char *format,...) |
Write a formatted string to the LCD.
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Protected Member Functions |
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void | writeLcdBitD4toD7 (char data) |
Writes the low nible of data to the LCD-module.
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void | pulseEn () |
Causes the LCD-module to read the data on the data input pins EN = 1 for L-to-H / EN = 0 for H-to-L.
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void | init_4BitMode2LinesDisplayOn () |
Enable 4 bit mode From KS0066U Documentation.
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TextLCD.cpp
- Committer:
- rlanghbv
- Date:
- 2015-09-20
- Revision:
- 3:d2f70de20dbe
- Parent:
- 2:f0a520c95838
- Child:
- 4:264d9b06bf60
File content as of revision 3:d2f70de20dbe:
/* * LCD.c * * Created: 20.01.2012 13:05:38 * Author: rul */ #include "mbed.h" #include "TextLCD.h" #define SET_EN() (LCD_EN=1) #define SET_RS() (LCD_RS=1) #define SET_RW() (LCD_RW=1) #define CLEAR_EN() (LCD_EN=0) #define CLEAR_RS() (LCD_RS=0) #define CLEAR_RW() (LCD_RW=0) //Enables the LCD Module for use 2-Lines... /*TextLCD::TextLCD() { CLEAR_EN(); //EN =0 wait_ms(500); init_4BitMode2LinesDisplayOn(); //enabler 4 bit mode wait_us(100); lcdComand(0x28);//(0b0010 1000); // 4- bit mode LCD 2 line 5x7 Matrix wait_us(100); lcdComand(0xE);//(0b0000 1110); //Hva gjør vi her ? wait_us(100); lcdComand(0x01); //(0b00000001); //Hva gjør vi her ? wait_us(100); lcdComand(0x06);//(0b00000110); //Hva gjør vi her ? wait_us(100); }*/ TextLCD::TextLCD(PinName rs,PinName rw, PinName e, PinName d4, PinName d5, PinName d6, PinName d7) : LCD_RS(rs),LCD_RW(rw), LCD_EN(e), LCD_D4(d4), LCD_D5(d5), LCD_D6(d6), LCD_D7(d7) { CLEAR_EN(); //EN =0 wait_ms(500); init_4BitMode2LinesDisplayOn(); //enabler 4 bit mode wait_us(100); lcdComand(0x28);//(0b0010 1000); // 4- bit mode LCD 2 line 5x7 Matrix wait_us(100); lcdComand(0xE);//(0b0000 1110); //Hva gjør vi her ? wait_us(100); lcdComand(0x01); //(0b00000001); //Hva gjør vi her ? wait_us(100); lcdComand(0x06);//(0b00000110); //Hva gjør vi her ? wait_us(100); } // Causes the LCD-module to read the data on the data input pins void TextLCD::pulseEn() { SET_EN(); // EN = 1 for L-to-H / wait_us(200); CLEAR_EN(); // EN = 0 for H-to-L } //Writes the low lible of data to the LCD-module data pins D4 to D7 void TextLCD::writeLcdBitD4toD7(char data) { if ( ( data >> 3) & 0x01) LCD_D7=1; else LCD_D7=0; if ( ( data >> 2) & 0x01) LCD_D6=1; else LCD_D6=0; if ( ( data >> 1) & 0x01) LCD_D5=1; else LCD_D5=0; if ( data & 0x01) LCD_D4=1; else LCD_D4=0; } //Enable 4 bit mode From KS0066U Documentation void TextLCD::init_4BitMode2LinesDisplayOn() { //Start by selecting configuration mode CLEAR_RS(); CLEAR_RW(); //Enable 4 bit mode From KS0066U Documentation writeLcdBitD4toD7(0x2);//(0b0010); // Select 4- bit start pulseEn(); //LCD exec function wait_us(100); writeLcdBitD4toD7(0x2);////(0b0010); // Select 4- bit start (Already on the out port no need to write once more ) pulseEn(); //LCD exec function wait_us(100); writeLcdBitD4toD7(0xC);//(0b1100); // 2 Lines + Disp On pulseEn(); //LCD exec function wait_us(100); } //Writes the byte comand to the LCD-module using 4 bits mode void TextLCD::lcdComand(unsigned char cmd) { writeLcdBitD4toD7(cmd>>4); //Write the first high cmd nibble CLEAR_RS(); // RS = 0 for command CLEAR_RW(); // RW = 0 for write pulseEn(); //EN Hi-Lo writeLcdBitD4toD7(cmd); //Write the second low cmd nibble pulseEn(); //EN H to Lo wait_us(100); //wait } void TextLCD::lcdData(unsigned char data) { writeLcdBitD4toD7(data>>4); //Write the first high data nibble SET_RS(); // RS = 1 for data CLEAR_RW(); // RW = 0 for write pulseEn(); // EN H to Lo wait_us(100); //wait writeLcdBitD4toD7(data); pulseEn(); //EN H to Lo wait_us(100); //wait } //Moves cursor to the X,Y position void TextLCD::gotoxy(int x, int y) { unsigned char firstCharAdr[]= { 0x80,0xc0,0x94,0xD4}; lcdComand(firstCharAdr[y-1]+ x -1); wait_us(100); } int TextLCD::_putc(int value) { lcdData(value); return value; } int TextLCD::_getc() { return -1; } //Writes a string to the LCD Display void TextLCD::lcd_print(char *str) { unsigned char i =0; while(str[i] !=0) { lcdData(str[i]); i++; } }