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I have written a program for driving lCDusing 89S52 using keil . It is working in simulation but not displaying any thing on the target board
In that program I have inserted a led blink code for knowing the program running status.The led is blinking means the code I have written is working .Then whats happening to my LCD part.
Please any body suggest something.The crystal is 11.0592Mhz .....My code below

//delay.h//
#ifndef __DELAY_H__
#define __DELAY_H__
void delay_us(unsigned int );
void delay_ms(unsigned int );
void delay_sec(unsigned char);
void lcd_reset();
void LCD_Init();
void LCD_CmdWrite( char );
void LCD_DataWrite( char );
void LCD_GoToLineOne();
void LCD_GoToLineTwo();
void LCD_CmdWrite( char );
void LCD_GoToXY(char , char );
void LCD_DisplayString(char *string_ptr);
void LCD_DisplayNumber(unsigned int );
void LCD_ScrollMessage(char *msg_ptr);

#endif

//delay.c//
#include<reg52.h>
/*----------------------------------------------------------------------------------
delay_us()
void delay_us(unsigned int us_count) { while(us_count!=0) { us_count--; } } void delay_ms(unsigned int ms_count) { while(ms_count!=0) { delay_us(112); //delay_us is called to generate 1ms delay ms_count--; } }

void delay_sec(unsigned char sec_count) { while(sec_count!=0) { delay_ms(1000); //delay_ms is called to generate 1sec delay sec_count--; } }
//D4-P0.4,D5-P0.5,D6-P0.6,D7-P0.7,RS-P0.0,RW-P0.1,EN-P0.2,
#include<reg52.h>
#include <delay.h>
#define databus P2
// LCD databus connected to PORT2
sbit rs= databus^0; // Register select pin connected to P0.0
sbit rw= databus^1; // Read Write pin connected to P0.1
sbit en= databus^2; // Enable pin connected to P0.2
/* 16x2 LCD Specification */
#define LCDMaxLines 2
#define LCDMaxChars 16
#define LineOne 0x80
#define LineTwo 0xc0
#define BlankSpace ' '
void lcd_reset()
{ databus = 0xFF; delay_ms(20); databus = 0x34; databus = 0x30; delay_ms(10); databus = 0x34; databus = 0x30; delay_ms(1); databus = 0x34; databus = 0x30; delay_ms(1); databus = 0x24; databus = 0x20; delay_ms(1);
} void LCD_Init() { //delay_us(5000); lcd_reset(); LCD_CmdWrite(0x02); //Initilize the LCD in 4bit Mode LCD_CmdWrite(0x28); LCD_CmdWrite(0x0E); // Display ON cursor ON LCD_CmdWrite(0x01); // Clear the LCD LCD_CmdWrite(0x80); // Move the Cursor to First line First Position }

void LCD_CmdWrite( char cmd) { databus=(cmd & 0xf0); // Send the Higher Nibble of the command to LCD rs=0; // Select the Command Register by pulling RS LOW rw=0; // Select the Write Operation by pulling RW LOW en=1; // Send a High-to-Low Pusle at Enable Pin delay_us(1); en=0; delay_us(10); // wait for some time databus=((cmd<<4) & 0xf0); // Send the Lower Nibble of the command to LCD rs=0; // Select the Command Register by pulling RS LOW rw=0; // Select the Write Operation by pulling RW LOW en=1; // Send a High-to-Low Pusle at Enable Pin delay_us(1); en=0; delay_ms(1); } void LCD_DataWrite( char dat) { databus=(dat & 0xf0); // Send the Higher Nibble of the Data to LCD rs=1; // Select the Data Register by pulling RS HIGH rw=0; // Select the Write Operation by pulling RW LOW en=1; // Send a High-to-Low Pusle at Enable Pin delay_us(1); en=0; delay_us(10); // wait for some time. databus=((dat <<4) & 0xf0); // Send the Lower Nibble of the Data to LCD rs=1; // Select the Data Register by pulling RS HIGH rw=0; // Select the Write Operation by pulling RW LOW en=1; // Send a High-to-Low Pusle at Enable Pin delay_us(1); en=0; delay_ms(1); }
void LCD_DisplayString(char *string_ptr)
{ while(*string_ptr)
LCD_DataWrite(*string_ptr++);
} void LCD_DisplayNumber(unsigned int num) { LCD_DataWrite((num/10000)+0x30); num=num%10000; LCD_DataWrite((num/1000)+0x30); num=num%1000; LCD_DataWrite((num/100)+0x30); num=num%100; LCD_DataWrite((num/10)+0x30); LCD_DataWrite((num%10)+0x30); }

void LCD_ScrollMessage(char *msg_ptr) { unsigned char i,j; LCD_CmdWrite(0x0c); //Disable the Cursor for(i=0;msg_ptr[i];i++) //Loop to display the complete string { //each time 16 chars are displayed and //pointer is incremented to point to next char LCD_GoToLineOne(); //Move the Cursor to first line for(j=0; j<LCDMaxChars && msg_ptr[i+j];j++) //loop to Display first 16 Chars LCD_DataWrite(msg_ptr[i+j]); //or till Null char for(j=j; j<LCDMaxChars; j++) //If the chars are below 16 LCD_DataWrite(BlankSpace); //then display blank spaces delay_ms(125); } LCD_CmdWrite(0x0E); //Enable the Cursor } void LCD_GoToLineOne() { LCD_CmdWrite(LineOne); // Move the Cursor to First line First Position }

void LCD_GoToLineTwo() { LCD_CmdWrite(LineTwo); // Move the Cursor to Second line First Position }

void LCD_GoToXY(char row, char col) { char pos; if(row<LCDMaxLines) { pos= LineOne | (row << 6); // take the line number //row0->pos=0x80 row1->pos=0xc0 if(col<LCDMaxChars) pos= pos+col; //take the char number //now pos points to the given XY pos LCD_CmdWrite(pos); // Move the Cursor to specified Position } }
//main.c//
#include<reg52.h>
#include <delay.h>
main()
{ unsigned char k;
LCD_Init() ;
LCD_GoToLineOne();
LCD_DisplayString("**SUSHILA KUMAR**");
P1 = 255;
while(1)
{ k = P1;
delay_ms(250); P3 = 0;
delay_ms(250); P3 = 255;
LCD_GoToLineTwo();
LCD_DisplayNumber(k);

}

}
kindly suggest me.........