Initialization code for 4-bit LCD

hi friends.
i'm interfacing LCD with 89S8252 n i'm using that LCD in 4-bit mode.
can anybody tell me the exact initialization code for LCD?[/b]

4 bit lcd init

For an exact initialization code it's important to know the exact LCD controller type.

gui lenh lcd 4 bit

Here is init routine for LCD 4-bit and Using PIC. Compiler is CCS

// lcd_lib_4bit.c
#include <stddef.h>

#define LCD_RS PIN_D2
//#define LCD_RW PIN_A1
#define LCD_EN PIN_D3

#define LCD_D4 PIN_D4
#define LCD_D5 PIN_D5
#define LCD_D6 PIN_D6
#define LCD_D7 PIN_D7

// misc display defines-
#define Line_1 0x80
#define Line_2 0xC0
#define Clear_Scr 0x01

// prototype statements
#separate void LCD_Init ( void );// ham khoi tao LCD
#separate void LCD_SetPosition ( unsigned int cX );//Thiet lap vi tri con tro
#separate void LCD_PutChar ( unsigned int cX );// Ham viet1kitu/1chuoi len LCD
#separate void LCD_PutCmd ( unsigned int cX) ;// Ham gui lenh len LCD
#separate void LCD_PulseEnable ( void );// Xung kich hoat
#separate void LCD_SetData ( unsigned int cX );// Dat du lieu len chan Data
// D/n Cong
#use standard_io ( B )
#use standard_io (A)

//khoi tao LCD**********************************************
#separate void LCD_Init ( void )
{
LCD_SetData ( 0x00 );
delay_ms(200);
output_low ( LCD_RS ); // Command mode
LCD_SetData ( 0x03 ); //
LCD_PulseEnable();
LCD_PulseEnable();
LCD_PulseEnable();
LCD_SetData ( 0x02 );
LCD_PulseEnable();
LCD_PutCmd ( 0x2C );
LCD_PutCmd ( 0b00001100);
LCD_PutCmd ( 0x06 );
LCD_PutCmd ( 0x01 );
}

#separate void LCD_SetPosition ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
LCD_SetData ( swap ( cX ) | 0x08 );
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
}

#separate void LCD_PutChar ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
output_high ( LCD_RS );
LCD_PutCmd( cX );
output_low ( LCD_RS );
}

#separate void LCD_PutCmd ( unsigned int cX )
{
/* this subroutine works specifically for 4-bit Port A */
LCD_SetData ( swap ( cX ) ); /* send high nibble */
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) ); /* send low nibble */
LCD_PulseEnable();
}
#separate void LCD_PulseEnable ( void )
{
output_high ( LCD_EN );
delay_us ( 3 ); // was 10
output_low ( LCD_EN );
delay_ms ( 3 ); // was 5
}

#separate void LCD_SetData ( unsigned int cX )
{
output_bit ( LCD_D4, cX & 0x01 );
output_bit ( LCD_D5, cX & 0x02 );
output_bit ( LCD_D6, cX & 0x04 );
output_bit ( LCD_D7, cX & 0x08 );
}

Gft from vietnam
www.dientuvietnam.net

Added after 5 minutes:

For AT89 and AVR is the same routine

<lcd_lib_4bit.c>

if learn so faster u may use

for pic
http://www.mikroe.com/


for 8051 core
http://www.mcselec.com


for simulation
http://www.labcenter.co.uk/index_uk.htm


no need any tools for ur lab.

thanks

masud

bit swapping 4bit

thanks linhnc308.............................

sdcc delay_ms 16

See also this, I use SDCC the free C Compiler and p89v51

https://mcu-programming.blogspot.com/2006/09/lcd-interfacing.html