LCD Interfacing with 8051 Microcontroller

- March 09, 2021

LCD Interfacing with 8051 Microcontroller

Hex Code	Command to LCD Instruction Register
0F	LCD ON, cursor ON
01	Clear display screen
02	Return home
04	Decrement cursor (shift cursor to left)
06	Increment cursor (shift cursor to right)
05	Shift display right
07	Shift display left
0E	Display ON, cursor blinking
80	Force cursor to the beginning of the first line
C0	Force cursor to the beginning of the second line
38	2 lines and 5×7 matrix
83	Cursor line 1 position 3
3C	Activate the second line
08	Display OFF, cursor OFF
C1	Jump to the second line, position 1
OC	Display ON, cursor OFF
C1	Jump to the second line, position 1
C2	Jump to a second line, position 2

Circuit Diagram :

Source Code:

// Program for LCD Interfacing with 8051 Microcontroller (P89V51RD2) 

#include<reg51.h>
#include <string.h>

#define display_port P2      //Data pins connected to port 2 on microcontroller
sbit rs = P0^0;  //Register Select pin connected to pin 0 of port 0
sbit rw = P0^1;  // Read/Write pin connected to pin 0 of port 1
sbit e =  P0^2;  //Enable pin connected to pin 0 of port 2

void msdelay(unsigned int time)  // Function for creating delay in milliseconds.
{
    unsigned i,j ;
    for(i=0;i<time;i++)    
    for(j=0;j<1275;j++);
}
void lcd_cmd(unsigned char command)  //Function to send command instruction to LCD
{
    display_port = command;
    rs= 0;
    rw=0;
    e=1;
    msdelay(1);
    e=0;
}

void lcd_data(unsigned char disp_data)  //Function to send display _data to LCD
{
    display_port = disp_data;
    rs= 1;
    rw=0;
    e=1;
    msdelay(1);
    e=0;
}

 void lcd_init()    //Function to prepare the LCD  and get it ready
{
    lcd_cmd(0x38);  // for _using 2 lines and 5X7 matrix of LCD
    msdelay(10);
    lcd_cmd(0x0F);  // turn display ON, cursor blinking
    msdelay(10);
    lcd_cmd(0x01);  //clear screen
    msdelay(10);
    lcd_cmd(0x81);  // bring cursor to position 1 of line 1
    msdelay(10);
}
void main()
{
    unsigned char a[15]="Surajkumar";    //string of 14 characters with a null terminator.
    int l=0;
		int len = strlen(a);
	
    lcd_init();
	
		for(l;l<len;l++)
		{
			lcd_data(a[l]);
			msdelay(50);
			
		} 
		
	   // OR
	
		
    //while(a[l] != '\0') // searching the null terminator in the sentence
    //{
    //    lcd_data(a[l]);
    //    l++;
    //    msdelay(50);
    //}
 
  while(1);

}