how to transmit data from RFID to lcd using 8051 in embeddedc language

rockey bhardwaj · Sep 6, 2013

Goodevening everyone

I am making an attendence system using 8051.But Id number is not displaying on the lcd. i am using the controller 8051. But I am fail to receive the data on lcd . If anyone know to display the data on lcd. Then please help me.
this is the code :
//Program to interface RFID with 8051 microcontroller (AT89C51)
#include<reg51.h>
unsigned int data_out,command=0x80,temp;
sfr lcd_data_pin=0xA0; //P2 port
sbit rs=P1^0; //Register select
sbit rw=P1^1; //Read/Write
sbit en=P1^2; //Enable pin
unsigned char card_id[12];

void delay(unsigned int count) //Function to provide delay
{
int i,j;
for(i=0;i<count;i++)
for(j=0;j<1275;j++);
}

void lcd_command(unsigned char comm) //Lcd command funtion
{
lcd_data_pin=comm;
en=1;
rs=0;
rw=0;
delay(1);
en=0;
}

void lcd_data(unsigned char disp) //Lcd data function
{
lcd_data_pin=disp;
en=1;
rs=1;
rw=0;
delay(1);
en=0;
}

lcd_string(unsigned char *disp) //Function to send string
{
int x;
for(x=0;disp[x]!=0;x++)
{
lcd_data(disp[x]);
}
}
void lcd_ini() //Function to initialize the LCD
{
lcd_command(0x38);
delay(5);
lcd_command(0x0F);
delay(5);
lcd_command(0x80);
delay(5);
}

void recieve() //Function to recieve data serialy from RS232
{
unsigned char k;
for(k=0;k<12;k++)
{
while(RI==0);
card_id[k]=SBUF;
RI=0;
}
}

void main()
{
int l;
TMOD=0x20; //Enable Timer 1
TH1=0XFD;
SCON=0x50;
TR1=1; // Triggering Timer 1
lcd_ini();
lcd_command(0x81); //Place cursor to second position of first line
lcd_string("UNIQUE CARD ID:");
delay(200);
while(1)
{
recieve();
lcd_command(0xC1); //Place cursor to second position of second line
for(l=0;l<12;l++)
{
lcd_data(card_id[l]);
}
}
}

Jinzpaul4u · Sep 6, 2013

Hi,

Delay may be the problem ..please verify your hardware connection once again..

Code:

void lcd_data(unsigned char disp) //Lcd data function
{
lcd_data_pin=disp;
en=1;
rs=1;
rw=0;
delay(5);
en=0;
}

Try these code..

Code:

#include <reg51.h>       //Define 8051 Registers
#include <stdio.h>       //Define I/O Functions
//#define DATA P0          //Define DATA to Port2
//sbit RS   = P0^0;        //Register Select
//sbit RW   = P0^1;        //LCD Read/Write
//sbit lcd_e = P0^2;       //LCD Enable
unsigned int data_out,command=0x80,temp;
sfr lcd_data_pin=0xA0; //P2 port
 sbit rs=P1^0; //Register select 
sbit rw=P1^1; //Read/Write 
sbit en=P1^2; //Enable pin
code unsigned char msg[]   = (" PS.PRIMER-8051 ");    //Display
code unsigned char msg1[] = (" 2x16 LCD DEMO ");
 
//----------------------------------
//         LCD Functions
//----------------------------------
void lcd_init(void);
void lcd_cmd(unsigned char);
void lcd_display(unsigned char);
void DelayMs(int);
 
//----------------------------------
//       LCD command Function
//----------------------------------
void lcd_cmd(unsigned char cmnd)  
{
    DATA = 0xf0&cmnd;                      //Masking lower 4 Bits
    RS = 0;  RW = 0;
    lcd_e = 1;
    DelayMs(35);
    lcd_e = 0;
 
    DATA = cmnd*16;                             //Masking lower 4
    RS = 0;  RW = 0;
    lcd_e = 1;
    DelayMs(35);
    lcd_e = 0;
 
}
 
//----------------------------------
//       LCD Data Function
//----------------------------------
void lcd_display(unsigned char dat)   
{
    DATA = 0xf0&dat;                            //Masking lower 4
    RS = 1;  RW = 0;
    lcd_e = 1;
    DelayMs(35);
    lcd_e = 0;
 
    DATA = dat*16;                              //Masking lower 4
    RS = 1;  RW = 0;
    lcd_e = 1;
    DelayMs(35);
    lcd_e = 0;
 
 
}
 
//----------------------------------
//       LCD Delay Function
//----------------------------------
void DelayMs(int k)  
    {
    unsigned int a;
    for(a=0;a<=k;a++);
    }
 
//----------------------------------
//       LCD Initialization
//----------------------------------
void lcd_init(void)  
{
    unsigned char i;
   
         lcd_cmd(0x28);                     //2x16 Character 5x7
         DelayMs(15);  //matrix LCD,4-bit format
         lcd_cmd(0x0c);                                     
         DelayMs(15);
         lcd_cmd(0x06);                                     //Shift
         DelayMs(15);
         lcd_cmd(0x01);                                     
         DelayMs(15);
 
//-------------------------------------------
//       First Line Message Display
//-------------------------------------------
         lcd_cmd(0x80);                                     
    DelayMs(35);
         i=0;
         while(msg[i]!='\0')
         {
             lcd_display(msg[i]);
             i++;
         }
    DelayMs(50);
 
//-------------------------------------------
//       Second Line Message Display
//-------------------------------------------
         lcd_cmd(0xc0);                                     //Second
         DelayMs(35);
         i=0;
         while(msg1[i]!='\0')
         {
             lcd_display(msg1[i]);
             i++;
         }
    DelayMs(50);
}
 
 
 
 
 
 
 
 
//----------------------------------
//       LCD Main Program
//----------------------------------
void main(void)
{
    P0 = 0;
    lcd_init();         //LCD Initialization
    DelayMs(1); 
    DelayMs(1); 
    while(1);            //Loop Forever
}

update me.

Best regards,

jayanth.devarayanadurga · Sep 6, 2013

You have to use ISR for serial data receive.

vinothksr08 · Sep 7, 2013

hello rockey,

the program you have is correct, it's working for me.. it may be problem with your hardware check it...

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how to transmit data from RFID to lcd using 8051 in embeddedc language

rockey bhardwaj

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Jinzpaul4u

Full Member level 4

Attachments

jayanth.devarayanadurga

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vinothksr08

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