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

TextLCD.cpp@4:264d9b06bf60, 2015-09-20 (annotated)

Committer:
rlanghbv
Date:
Sun Sep 20 11:54:39 2015 +0000
Revision:
4:264d9b06bf60
Parent:
3:d2f70de20dbe
Child:
5:d9eb6ed84a06
Doc Update

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rlanghbv 1:8902f6be12a5 1 /*
rlanghbv 1:8902f6be12a5 2 * LCD.c
rlanghbv 1:8902f6be12a5 3 *
rlanghbv 1:8902f6be12a5 4 * Created: 20.01.2012 13:05:38
rlanghbv 1:8902f6be12a5 5 * Author: rul
rlanghbv 1:8902f6be12a5 6 */
rlanghbv 1:8902f6be12a5 7
rlanghbv 1:8902f6be12a5 8 #include "mbed.h"
rlanghbv 1:8902f6be12a5 9 #include "TextLCD.h"
rlanghbv 1:8902f6be12a5 10
rlanghbv 1:8902f6be12a5 11 #define SET_EN() (LCD_EN=1)
rlanghbv 1:8902f6be12a5 12 #define SET_RS() (LCD_RS=1)
rlanghbv 1:8902f6be12a5 13 #define SET_RW() (LCD_RW=1)
rlanghbv 1:8902f6be12a5 14
rlanghbv 1:8902f6be12a5 15 #define CLEAR_EN() (LCD_EN=0)
rlanghbv 1:8902f6be12a5 16 #define CLEAR_RS() (LCD_RS=0)
rlanghbv 1:8902f6be12a5 17 #define CLEAR_RW() (LCD_RW=0)
rlanghbv 1:8902f6be12a5 18
rlanghbv 1:8902f6be12a5 19
rlanghbv 4:264d9b06bf60 20 TextLCD::TextLCD(PinName rs,PinName rw, PinName e, PinName d4, PinName d5,
rlanghbv 4:264d9b06bf60 21 PinName d6, PinName d7) : LCD_RS(rs),LCD_RW(rw),
rlanghbv 4:264d9b06bf60 22 LCD_EN(e), LCD_D4(d4), LCD_D5(d5), LCD_D6(d6), LCD_D7(d7)
rlanghbv 3:d2f70de20dbe 23 {
rlanghbv 4:264d9b06bf60 24
rlanghbv 4:264d9b06bf60 25 CLEAR_RW();
rlanghbv 4:264d9b06bf60 26 wait_ms(50); // Wait for disp to turn on
rlanghbv 4:264d9b06bf60 27
rlanghbv 3:d2f70de20dbe 28 CLEAR_EN(); //EN =0
rlanghbv 4:264d9b06bf60 29 CLEAR_RS();
rlanghbv 3:d2f70de20dbe 30
rlanghbv 4:264d9b06bf60 31 init_4BitMode2LinesDisplayOn(); //enabler 4 bit mode
rlanghbv 4:264d9b06bf60 32 wait_ms(1);
rlanghbv 4:264d9b06bf60 33
rlanghbv 4:264d9b06bf60 34 lcdComand(0x00);
rlanghbv 3:d2f70de20dbe 35 wait_us(100);
rlanghbv 3:d2f70de20dbe 36
rlanghbv 4:264d9b06bf60 37 lcdComand(0x28);//(0b0010 1000); // 4- bit mode LCD 2 line 16x2 Matrix
rlanghbv 3:d2f70de20dbe 38 wait_us(100);
rlanghbv 4:264d9b06bf60 39
rlanghbv 4:264d9b06bf60 40 lcdComand(0xE);//(0b0000 1110); // Hva gjør vi her ?
rlanghbv 3:d2f70de20dbe 41 wait_us(100);
rlanghbv 3:d2f70de20dbe 42 lcdComand(0x01); //(0b00000001); //Hva gjør vi her ?
rlanghbv 3:d2f70de20dbe 43 wait_us(100);
rlanghbv 3:d2f70de20dbe 44 lcdComand(0x06);//(0b00000110); //Hva gjør vi her ?
rlanghbv 3:d2f70de20dbe 45 wait_us(100);
rlanghbv 3:d2f70de20dbe 46
rlanghbv 1:8902f6be12a5 47 }
rlanghbv 1:8902f6be12a5 48
rlanghbv 1:8902f6be12a5 49
rlanghbv 1:8902f6be12a5 50 // Causes the LCD-module to read the data on the data input pins
rlanghbv 1:8902f6be12a5 51 void TextLCD::pulseEn()
rlanghbv 1:8902f6be12a5 52 {
rlanghbv 1:8902f6be12a5 53 SET_EN(); // EN = 1 for L-to-H /
rlanghbv 1:8902f6be12a5 54 wait_us(200);
rlanghbv 1:8902f6be12a5 55 CLEAR_EN(); // EN = 0 for H-to-L
rlanghbv 1:8902f6be12a5 56 }
rlanghbv 1:8902f6be12a5 57
rlanghbv 1:8902f6be12a5 58 //Writes the low lible of data to the LCD-module data pins D4 to D7
rlanghbv 1:8902f6be12a5 59 void TextLCD::writeLcdBitD4toD7(char data)
rlanghbv 1:8902f6be12a5 60 {
rlanghbv 1:8902f6be12a5 61 if ( ( data >> 3) & 0x01) LCD_D7=1;
rlanghbv 1:8902f6be12a5 62 else LCD_D7=0;
rlanghbv 1:8902f6be12a5 63 if ( ( data >> 2) & 0x01) LCD_D6=1;
rlanghbv 1:8902f6be12a5 64 else LCD_D6=0;
rlanghbv 1:8902f6be12a5 65 if ( ( data >> 1) & 0x01) LCD_D5=1;
rlanghbv 1:8902f6be12a5 66 else LCD_D5=0;
rlanghbv 1:8902f6be12a5 67 if ( data & 0x01) LCD_D4=1;
rlanghbv 1:8902f6be12a5 68 else LCD_D4=0;
rlanghbv 1:8902f6be12a5 69 }
rlanghbv 1:8902f6be12a5 70
rlanghbv 1:8902f6be12a5 71 //Enable 4 bit mode From KS0066U Documentation
rlanghbv 1:8902f6be12a5 72 void TextLCD::init_4BitMode2LinesDisplayOn()
rlanghbv 1:8902f6be12a5 73 {
rlanghbv 1:8902f6be12a5 74 //Start by selecting configuration mode
rlanghbv 1:8902f6be12a5 75 CLEAR_RS();
rlanghbv 1:8902f6be12a5 76 CLEAR_RW();
rlanghbv 1:8902f6be12a5 77
rlanghbv 4:264d9b06bf60 78 // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
rlanghbv 4:264d9b06bf60 79 writeLcdBitD4toD7(0x3);
rlanghbv 4:264d9b06bf60 80 pulseEn();
rlanghbv 4:264d9b06bf60 81 wait_ms(2);
rlanghbv 4:264d9b06bf60 82 writeLcdBitD4toD7(0x3);
rlanghbv 4:264d9b06bf60 83 pulseEn();
rlanghbv 4:264d9b06bf60 84 wait_ms(2);
rlanghbv 4:264d9b06bf60 85 writeLcdBitD4toD7(0x3);
rlanghbv 4:264d9b06bf60 86 pulseEn();
rlanghbv 4:264d9b06bf60 87 wait_ms(2);
rlanghbv 4:264d9b06bf60 88
rlanghbv 1:8902f6be12a5 89 //Enable 4 bit mode From KS0066U Documentation
rlanghbv 1:8902f6be12a5 90 writeLcdBitD4toD7(0x2);//(0b0010); // Select 4- bit start
rlanghbv 1:8902f6be12a5 91 pulseEn(); //LCD exec function
rlanghbv 1:8902f6be12a5 92 wait_us(100);
rlanghbv 1:8902f6be12a5 93
rlanghbv 1:8902f6be12a5 94 writeLcdBitD4toD7(0x2);////(0b0010); // Select 4- bit start (Already on the out port no need to write once more )
rlanghbv 1:8902f6be12a5 95 pulseEn(); //LCD exec function
rlanghbv 1:8902f6be12a5 96 wait_us(100);
rlanghbv 1:8902f6be12a5 97
rlanghbv 1:8902f6be12a5 98 writeLcdBitD4toD7(0xC);//(0b1100); // 2 Lines + Disp On
rlanghbv 1:8902f6be12a5 99 pulseEn(); //LCD exec function
rlanghbv 1:8902f6be12a5 100 wait_us(100);
rlanghbv 1:8902f6be12a5 101 }
rlanghbv 1:8902f6be12a5 102
rlanghbv 1:8902f6be12a5 103
rlanghbv 1:8902f6be12a5 104 //Writes the byte comand to the LCD-module using 4 bits mode
rlanghbv 1:8902f6be12a5 105 void TextLCD::lcdComand(unsigned char cmd)
rlanghbv 1:8902f6be12a5 106 {
rlanghbv 1:8902f6be12a5 107 writeLcdBitD4toD7(cmd>>4); //Write the first high cmd nibble
rlanghbv 1:8902f6be12a5 108
rlanghbv 1:8902f6be12a5 109 CLEAR_RS(); // RS = 0 for command
rlanghbv 1:8902f6be12a5 110 CLEAR_RW(); // RW = 0 for write
rlanghbv 1:8902f6be12a5 111
rlanghbv 1:8902f6be12a5 112 pulseEn(); //EN Hi-Lo
rlanghbv 1:8902f6be12a5 113
rlanghbv 1:8902f6be12a5 114 writeLcdBitD4toD7(cmd); //Write the second low cmd nibble
rlanghbv 1:8902f6be12a5 115
rlanghbv 1:8902f6be12a5 116 pulseEn(); //EN H to Lo
rlanghbv 1:8902f6be12a5 117
rlanghbv 1:8902f6be12a5 118 wait_us(100); //wait
rlanghbv 1:8902f6be12a5 119 }
rlanghbv 1:8902f6be12a5 120
rlanghbv 1:8902f6be12a5 121 void TextLCD::lcdData(unsigned char data)
rlanghbv 1:8902f6be12a5 122 {
rlanghbv 1:8902f6be12a5 123 writeLcdBitD4toD7(data>>4); //Write the first high data nibble
rlanghbv 1:8902f6be12a5 124
rlanghbv 1:8902f6be12a5 125 SET_RS(); // RS = 1 for data
rlanghbv 1:8902f6be12a5 126 CLEAR_RW(); // RW = 0 for write
rlanghbv 1:8902f6be12a5 127 pulseEn(); // EN H to Lo
rlanghbv 1:8902f6be12a5 128 wait_us(100); //wait
rlanghbv 1:8902f6be12a5 129
rlanghbv 1:8902f6be12a5 130 writeLcdBitD4toD7(data);
rlanghbv 1:8902f6be12a5 131
rlanghbv 1:8902f6be12a5 132 pulseEn(); //EN H to Lo
rlanghbv 1:8902f6be12a5 133 wait_us(100); //wait
rlanghbv 1:8902f6be12a5 134 }
rlanghbv 1:8902f6be12a5 135
rlanghbv 1:8902f6be12a5 136 //Moves cursor to the X,Y position
rlanghbv 2:f0a520c95838 137 void TextLCD::gotoxy(int x, int y)
rlanghbv 1:8902f6be12a5 138 {
rlanghbv 1:8902f6be12a5 139 unsigned char firstCharAdr[]= { 0x80,0xc0,0x94,0xD4};
rlanghbv 1:8902f6be12a5 140 lcdComand(firstCharAdr[y-1]+ x -1);
rlanghbv 1:8902f6be12a5 141
rlanghbv 1:8902f6be12a5 142 wait_us(100);
rlanghbv 1:8902f6be12a5 143 }
rlanghbv 1:8902f6be12a5 144
rlanghbv 1:8902f6be12a5 145 int TextLCD::_putc(int value)
rlanghbv 1:8902f6be12a5 146 {
rlanghbv 1:8902f6be12a5 147 lcdData(value);
rlanghbv 1:8902f6be12a5 148 return value;
rlanghbv 1:8902f6be12a5 149 }
rlanghbv 1:8902f6be12a5 150
rlanghbv 4:264d9b06bf60 151 int TextLCD::_getc()
rlanghbv 1:8902f6be12a5 152 {
rlanghbv 4:264d9b06bf60 153 return -1;
rlanghbv 1:8902f6be12a5 154 }