Code:
#include <dos.h>
#include <string.h>
#include <conio.h>
#include <time.h>
#define PORTADDRESS 0x378 /* Enter Your Port Address Here */
#define DATA PORTADDRESS+0
#define STATUS PORTADDRESS+1
#define CONTROL PORTADDRESS+2
void lcd_init(void);
void lcd_write(char char2write);
void lcd_putch(char char2write);
void lcd_puts(char * str2write);
void lcd_goto(int row, int column);
void lcd_clear(void);
void lcd_home(void);
void lcd_cursor(int cursor);
void lcd_entry_mode(int mode);
void main(void)
{
lcd_init();
lcd_goto(1,1);
lcd_puts("Welcome To");
lcd_goto(1,0);
lcd_puts("electroSofts.com");
while(!kbhit() ) //wait until a key is pressed...
{}
}
void lcd_init()
{
outportb(CONTROL, inportb(CONTROL) & 0xDF);
//config data pins as output
outportb(CONTROL, inportb(CONTROL) | 0x08);
//RS is made high: control (register select)
lcd_write(0x0f);
delay(20);
lcd_write( 0x01);
delay(20);
lcd_write( 0x38);
delay(20);
}
void lcd_write(char char2write)
{
outportb(DATA, char2write);
outportb(CONTROL,inportb(CONTROL) | 0x01); /* Set Strobe */
delay(2);
outportb(CONTROL,inportb(CONTROL) & 0xFE); /* Reset Strobe */
delay(2);
}
void lcd_putch(char char2write)
{
outportb(CONTROL, inportb(CONTROL) & 0xF7);
//RS=low: data
lcd_write(char2write);
}
void lcd_puts(char *str2write)
{
outportb(CONTROL, inportb(CONTROL) & 0xF7);
//RS=low: data
while(*str2write)
lcd_write(*(str2write++));
}
void lcd_goto(int row, int column)
{
outportb(CONTROL, inportb(CONTROL) | 0x08);
if(row==2) column+=0x40;
/* Add these if you are using LCD module with 4 columns
if(row==2) column+=0x14;
if(row==3) column+=0x54;
*/
lcd_write(0x80 | column);
}
void lcd_clear()
{
outportb(CONTROL, inportb(CONTROL) | 0x08);
lcd_write(0x01);
}
void lcd_home()
{
outportb(CONTROL, inportb(CONTROL) | 0x08);
lcd_write(0x02);
}
void lcd_entry_mode(int mode)
{
/*
if you dont call this function, entry mode sets to 2 by default.
mode: 0 - cursor left shift, no text shift
1 - no cursor shift, text right shift
2 - cursor right shift, no text shift
3 - no cursor shift, text left shift
*/
outportb(CONTROL, inportb(CONTROL) | 0x08);
lcd_write(0x04 + (mode%4));
}
void lcd_cursor(int cursor)
{
/*
set cursor: 0 - no cursor, no blink
1 - only blink, no cursor
2 - only cursor, no blink
3 - both cursor and blink
*/
outportb( CONTROL, inportb(CONTROL) | 0x08 );
lcd_write( 0x0c + (cursor%4));
}
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