The popular 16 x 2 LCD can be interfaced with 89S52 in 4 bit or 8 bit mode. To save port pins of microcontroller , often the LCD is used in 4 bit mode.

The connection details are :

Data pins  D4  — P2.0  (pin 21)

                  D5  — P2.1 (pin22)

                  D6  — P2.2 (pin23)

                  D7  — P2.3 (pin24)

Control pins  RS  — P0.0 (pin 39)

                      EN  — P0.1 (pin 38)

                      R/W – GND  

 

89s51_lcd

 

A header file defining all Functions related to LCD control is created and available for Download here .

Including this header file into your project makes programming much easier.

To start with create a folder  for your project , say F:\LCD

Open the KEIL IDE

Click Project – > New uVision Project & browse to the location of the folder created F:\LCD

Provide a filename for the project & select the Target as AT89S52.

Click OK to get the Target1 on the project pane.

Right click the Target1 & click on “Options for Target Target1”

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On the Options windows , select the OUTPUT tab & then check mark the box which says “Create HEX file”

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Now copy the downloaded lcd.h Header file & paste it to the project folder .

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Back to KEIL IDE , Right click on “Source Group 1” & click on “Add Existing Files to Group “

Browse to the lcd.h file you’ve added to the project & select it.

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Now the Header file is included in to the project folder.

 

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Right click again on the Source Group 1 & click on “Add new item to Group “

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On the next screen select the first option “C File “ & provide a name to your C file.

 

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Feed in the following code :

—————————————-

#include<reg52.h> //including sfr registers for ports of 89s52
#include<lcd.h>  // lcd header file

//LCD Module Connections
sbit RS = P0^0;
sbit EN = P0^1;
sbit D4 = P2^0;
sbit D5 = P2^1;
sbit D6 = P2^2;
sbit D7 = P2^3;
//End LCD Module Connections
void Delay(int a)
{
  int j;
  int i;
  for(i=0;i<a;i++)
  {
    for(j=0;j<100;j++)
    {
    }
  }
   
}
void main()
{
  int i;
  Lcd_Init();
    Lcd_Clear();
  while(1)
  {
    Lcd_Set_Cursor(1,1);
    Lcd_Write_String("8051 LCD Interface");
    for(i=0;i<18;i++)
    {
      Delay(1000);
      Lcd_Shift_Left();
    }
    for(i=0;i<18;i++)
    {
      Delay(1000);
      Lcd_Shift_Right();
    }
    Lcd_Clear();
    Lcd_Set_Cursor(2,1);
    Lcd_Write_Char(‘S’);
    Lcd_Write_Char(‘E’);
    Delay(2000);
  }
}

————————————————

After feeding in the code , click the Save button.

Now click F7 or the Build button to start building target.

 

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If the code syntax are correct , you get “Creating HEX file “ display on the Output window.

 

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Now the HEX file is successfully created inside your project folder.

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Connect the ISP programmer to the Development board.Plug in the LCD module on to the LCD port connector.

Connect the USB cable to PC & open the PROGISP software.

Click on File & “Load Flash “ .Browse to the location of the HEX file & select it.

Click on AUTO to perform the programming.

 

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Now you can see the characters displayed on the LCD.You can adjust the small blue preset if nothing is seen on the LCD.

lcd1 (1)

LCD HEADER file & C file DOWNLOAD

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