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8051 Evaluation Board

The is specifically designed to help students to master the required skills in the area of embedded systems. The kit is designed in such way that all the possible features of the microcontroller will be easily used by the students. The kit supports in system programming (ISP) which is done through serial port.

NXP’s 8051 (AT89V51RD2),

8051 Evaluation Kit

is proposed to smooth the progress of developing and debugging of various designs encompassing of speed 8-bit Microcontrollers.

GLCD (Graphical Liquid Crystal Display)

The Graphics LCD as the name suggests is a type of LCD which can display graphics. The graphical representation of any data presents good understanding than just characters. More user friendly applications can be designed by using the graphical LCDs.

Interfacing GLCD

Fig. 1 shows how to interface the GLCD to microcontroller. The 128X64 Graphical LCD interfaces to adjust contrast through trim pot. The GLCD needed to create 8-bit interface; 8 data bits (D0 – D7), three control lines, address bit (RS), read/write bit (R/W) and control signal (E), Page Select (CS).



Microcontroller Port Lines

Fig. 1 Interfacing GLCD to Microcontroller

Interfacing GLCD with 8051

We now want to display a text in 8051 Evaluation Board

by using GLCD module. The

8051 Development board has numbers of GLCD connections, connected with I/O Port lines (P3.2, P3.3, P3.4 – P3.7 && P1.0 – P1.7) to make GLCD display.

Pin Assignment with 8051

 

GLCD/LCD

8051

LCD | 128x64 GLCD Selection

CONTROL L LINES

CS1

P3.2



128x64 GLCD

CS2

P3.3

RS

P3.4

R/W

P3.5

E

P3.6

RST

P3.7

LCD – DATA LINES

DB0

P1.0

DB1

P1.1

DB2

P1.2

DB3

P1.3

DB4

P1.4

DB5

P1.5

DB6

P1.6

DB7

P1.7

 


128x64 GLCD

Circuit Diagram to Interface GLCD with 8051



Circuit Diagram to Interface GLCD with 8051

Source Code

The Interfacing GLCD with 8051 program is very simple and straight forward that display a text in 128 X 64 GLCD modules. Some delay is occurring when a single command / data is executed. In C programs you cannot be sure of delay, because it depends on compiler how it optimizes the loops as soon as you make changes in the options the delay changes.

C Program to display a text in GLCD using 8051

***************************************************************************************

Title : Program to GLCD display

***************************************************************************************

 

#include                     
#include                     
#define DATA P1                       
sbit CS1     = P3^2;                  
sbit CS2     = P3^3;                  
sbit RS      = P3^4;                   
sbit RW = P3^5;                       
sbit lcd_e   = P3^6;                  
           sbit RST     = P3^7;                                                
void GLCD_PutPicture(const unsigned char *);
void Select_page(unsigned char);
 
int i;
//---------------------------------
//Load your black&white images here
//---------------------------------
code unsigned char const pan_bmp[1024] = {
   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
   0,  0,  0,  0,192,192,192,192,192,192,192,128,  0,  0,  0,  0,
   0,  0,192,192,192,  0,  0,  0,  0,  0,192,192,128,  0,  0,  0,
   0,  0,192,192,  0,192,192,192,192,192,192,192,192,192,192,  0,
 192,192,192,192,192,192,192,192,192,  0,  0,  0,128,128,192,192,
 192,192,192,128,  0,  0,  0,192,192,  0,  0,  0,  0,  0,  0,192,
 192,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
   0,  0,  0,  0,255,255, 24, 24, 24, 24, 29, 15,  7,  0,  0,192,
 248,127,103, 96,103,127,248,192,  0,  0,255,255,  3,  7, 28, 56,
 224,192,255,255,  0,  0,  0,  0,  0,255,255,  0,  0,  0,  0,  0,
 255,255, 24, 24, 24, 24, 24, 24, 24,  0,  0,126,255,129,  0,  0,
   0,  0,129,195,129,  0,  0,255,255, 24, 24, 24, 24, 24, 24,255,
   
    255,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  3,  3,  0,  0,  0,  0,  0,  0,  0,  0,  2,  3,
     1,  0,  0,  0,  0,  0,  1,  3,  2,  0,  3,  3,  0,  0,  0,  0,
     0,  1,  3,  3,  0,  0,  0,  0,  0,  3,  3,  0,  0,  0,  0,  0,
     3,  3,  3,  3,  3,  3,  3,  3,  3,  0,  0,  0,  1,  1,  3,  3,
     3,  3,  3,  1,  0,  0,  0,  3,  3,  0,  0,  0,  0,  0,  0,  3,
     3,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,112,248,204,204,
    140,140,156, 56, 48,  0,  0,224,248, 24, 12, 12, 12, 12, 24,248,
      224,  0,  0,252,252,  0,  0,  0,  0,  0,  0,  0,  0,252,252,  0,
     0,  0,  0,  0,  0,252,252,  0, 12, 12, 12, 12,252,252, 12, 12,
     12, 12,  0,252,252,  0,  0,224,248, 24, 12, 12, 12, 12, 24,248,
    224,  0,  0,252,252, 56,112,192,128,  0,  0,252,252,  0,  0,112,
     248,204,204,140,140,156, 56, 48,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 12, 28, 56, 49,
     49, 49, 59, 31, 14,  0,  0,  7, 31, 24, 48, 48, 48, 48, 24, 31,
   7,  0,  0, 63, 63, 48, 48, 48, 48, 48, 48,  0,  0, 15, 31, 56,
     48, 48, 48, 48, 56, 31, 15,  0,  0,  0,  0,  0, 63, 63,  0,  0,
     0,  0,  0, 63, 63,  0,  0,  7, 31, 24, 48, 48, 48, 48, 24, 31,
     7,  0,  0, 63, 63,  0,  0,  1,  3, 14, 28, 63, 63,  0,  0, 12,
     28, 56, 49, 49, 49, 59, 31, 14,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0, 12,  6,255,255,  0,  0,130,195, 97, 49,
     31, 14,  0,238,255, 17, 17,255,238,  0,131,239,124, 56,124,239,
    131,  0,252,254,  9,  9,251,242,  0, 96, 88, 70,255,255, 64,  0,
     0,  0,  0,124,254,131,  1, 17,243,242,  0,255,255,  0,  0,  0,
     0,  0,124,254,131,  1,  1,131,130,  0,255,255,  1,  1,131,254,
      124,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     
0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  0,  1,  1,  1,  1,
     1,  1,  0,  0,  1,  1,  1,  1,  0,  0,  1,  1,  0,  0,  0,  1,
     1,  0,  0,  1,  1,  1,  1,  0,  0,  0,  0,  0,  1,  1,  0,  0,
     0,  0,  0,  0,  0,  1,  1,  1,  1,  0,  0,  1,  1,  1,  1,  1,
     1,  0,  0,  0,  1,  1,  1,  1,  0,  0,  1,  1,  1,  1,  1,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0
      };
 
//----------------------------------
//          LCD Functions
//----------------------------------
void GLCD_Init();
void GLCD_Data(unsigned char);
void GLCD_Comd(unsigned char);
void DelayMs(int);
//----------------------------------
//       LCD command Function
//----------------------------------
void GLCD_Comd(unsigned char cmnd)
 {
    DATA = cmnd;     //send command to port
    RS = 0;               //make it RS to Low
    RW = 0;               //make it RW to low
    lcd_e = 1;            //enbale high
    DelayMs(10);
    lcd_e = 0;            //enable low
 }
 
//----------------------------------
//       LCD Data Function
//----------------------------------
void GLCD_Data(unsigned char dat) 
 {
    DATA = dat;           //send command to port
    RS = 1;               //make it RS to high
    RW = 0;               //make it RW to low
    lcd_e = 1;            //enbale high
    DelayMs(10);
    lcd_e = 0;            //enbale low
    }
//----------------------------------
//       LCD Delay Function
//----------------------------------
void DelayMs(int k)  
    {
         unsigned int a;
         for(a=0;a<=k;a++);
    }
//----------------------------------
//       GLCD Initialization Function
//----------------------------------
void GLCD_Init()
{
    unsigned char Comd[5]={0xc0,0xb8,0x40,0x3f};//LCD Command list
    Select_page(1);           //send commands to page1
    for(i=0;i<4;i++)
    GLCD_Comd(Comd[i]);      
    Select_page(0);           //send commands to page0
    for(i=0;i<4;i++)
    GLCD_Comd(Comd[i]);
}
 
//----------------------------------
//       Page Selection
//----------------------------------
void Select_page(unsigned char Page)
{
    if(Page)
    {
         CS1=0;       //Page 0 LCD IC1
         CS2=1;
    }
    else
         {
             CS1=1;   //Page 1 LCD IC2
             CS2=0;
         }
}
//-------------------------------------
//  Display Picture for page0 & page1
//-------------------------------------
void GLCD_PutPicture(const unsigned char *ip) //Change here for method 1,2 and 3
{
    int Page=0,i=0;
    int Column=0;
       for (Page = 0; Page < 8; Page++)      
    {
         Select_page(1);                        //Display part of image to Page1
         GLCD_Comd(0xb8 | Page);
         GLCD_Comd(0x40);
                  for (Column = 0; Column < 128; Column++)
         {
             if (Column == 64)
            { 
                 Select_page(0);                    //Display part of image to Page0
                 GLCD_Comd(0xb8 | Page);
                   GLCD_Comd(0x40); 
            }
             GLCD_Data(*ip++);                          
        }
    }
}
 
//------------------------
//  Main Program
//-----------------------
void main(void)
{
    DelayMs(2);     
    RST = 1;
    DelayMs(5);     
    RST =   0;
    DelayMs(5);     
    RST =    1;
    DelayMs(5);     
    GLCD_Init();              //Initialize GLCD
    DelayMs(15);    
    GLCD_PutPicture(pan_bmp);//Display Image
    while(1);                      //wait forever
}