Rune Langoy / LCDLib

A TextLCD interface for driving 4-bit 16x2 KS0066U LCD

Dependents:   KS0066U4_16x2 LAB05_Oppgave4 LAB05_Oppgave2 LAB05_Oppgave3 ... more

Import program
KS0066U4_16x2 - main.cpp

00001  #include "mbed.h"
00002  #include "TextLCD.h"
00003  
00004  TextLCD lcd(D11,D10,D9,D5,D4,D3,D2);
00005  int main()
00006  {    
00007     lcd.gotoxy(1,1);
00008     lcd.printf("Hello");
00009  
00010     lcd.gotoxy(4,2);
00011     lcd.printf("World");
00012     
00013     while(1) {
00014         wait_ms(300);
00015     }
00016  }

Import library
LCDLib - TextLCD Class Reference

Public Member Functions

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.
void lcdComand (unsigned char cmd)
Writes a Command to the LCD-module.
void lcdData (unsigned char data)
Writes charecters to the LCD display.
void gotoxy (int, int)
moves text cursor to a screen column and row
int putc (int c)
Write a character to the LCD.
int printf (const char *format,...)
Write a formatted string to the LCD.

Protected Member Functions

void writeLcdBitD4toD7 (char data)
Writes the low nible of data to the LCD-module.
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.
void init_4BitMode2LinesDisplayOn ()
Enable 4 bit mode From KS0066U Documentation.

/media/uploads/rlanghbv/lcdmoduletop.jpg /media/uploads/rlanghbv/lcdmodulebottom.jpg

Diff: TextLCD.cpp

Revision:
4:264d9b06bf60
Parent:
3:d2f70de20dbe
Child:
5:d9eb6ed84a06
--- a/TextLCD.cpp	Sun Sep 20 11:06:45 2015 +0000
+++ b/TextLCD.cpp	Sun Sep 20 11:54:39 2015 +0000
@@ -17,50 +17,36 @@
 #define CLEAR_RW() (LCD_RW=0)
 
 
-//Enables the LCD Module for use 2-Lines...
-/*TextLCD::TextLCD()
+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_RW();
+    wait_ms(50);  // Wait for disp to turn on
+
     CLEAR_EN(); //EN =0
-    wait_ms(500);
+    CLEAR_RS();
 
-    init_4BitMode2LinesDisplayOn();  //enabler 4 bit mode
+    init_4BitMode2LinesDisplayOn();    //enabler 4 bit mode
+    wait_ms(1);
+
+    lcdComand(0x00);
     wait_us(100);
 
-    lcdComand(0x28);//(0b0010 1000);	// 4- bit mode   LCD 2 line 5x7 Matrix
+    lcdComand(0x28);//(0b0010 1000);   // 4- bit mode   LCD 2 line 16x2 Matrix
     wait_us(100);
-    lcdComand(0xE);//(0b0000 1110);  //Hva gjør vi her ?
+
+    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()
 {
@@ -89,6 +75,17 @@
     CLEAR_RS();
     CLEAR_RW();
 
+    // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
+    writeLcdBitD4toD7(0x3);
+    pulseEn();
+    wait_ms(2);
+    writeLcdBitD4toD7(0x3);
+    pulseEn();
+    wait_ms(2);
+    writeLcdBitD4toD7(0x3);
+    pulseEn();
+    wait_ms(2);
+
     //Enable 4 bit mode  From KS0066U Documentation
     writeLcdBitD4toD7(0x2);//(0b0010);   // Select 4- bit start
     pulseEn();	//LCD exec function
@@ -136,8 +133,6 @@
     wait_us(100); //wait
 }
 
-
-
 //Moves cursor to the X,Y position
 void TextLCD::gotoxy(int x, int y)
 {
@@ -153,16 +148,7 @@
     return value;
 }
 
-int TextLCD::_getc() {
-    return -1;
-}
-
-//Writes a string to the LCD Display
-void TextLCD::lcd_print(char *str)
+int TextLCD::_getc()
 {
-    unsigned char i =0;
-    while(str[i] !=0) {
-        lcdData(str[i]);
-        i++;
-    }
+    return -1;
 }
\ No newline at end of file