Serial communication in lcd

[Syed Imran]

Hi,

 

I need the code for how to communicate serially in lcd i.e watever i type in the hyperterminal,it should display on the lcd. Waiting for your response.

 

Thanking You

[Syed Imran]

Any reply to my query.

[Dexter]

use this coding

it may help u

re check according to ur circuit

 

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

#define LCD_PORT P1            //lcd data port

/*        PIN CONNECTIONS            */
sbit    EN=P3^2;        //enable pin for LCD
sbit    RW=P3^3;        //write pin for LCD         
sbit    RS=P3^4;        //register select pin of LCD

/*        Declarations         */
//  DELAYS
void del_1ms        (void);                    //1 milli second delay
void del_30ms        (void);                    //30 milli second delay
void del_1s            (void);                    //delay of 1 second
void del_3ms        (void);                    //delay of 3 milli seconds

//  LCD
void lcd_init        (void);                //routine to initialise LCD
void printLcd        (unsigned char *);        //prints a line on LCD
void printLcd2        (unsigned char *);        //prints a line on LCD
void clear_display    (void);                    //clears LCD screen
void display_data    (unsigned char);        //displays one char
void set_add        (unsigned char );        //sets the display position
void write_in        (unsigned char );        //writes data in to LCD as instruction
void write_data        (unsigned char );        //writes one byte into LCD as data
void write            (unsigned char );        //writes one byte into LCD
void lcd_cmdwrt(unsigned char );
void lcd_datawrt(unsigned char *);

//  SERIAL COMMUNICATION
void serial_init        (void);                        //initialise serial communication
unsigned char recv_byte    (void);                        //recieves th ASCII value
void send_byte            (unsigned char);            //sends ASCII value to PC or microcontroller
void sendString            (unsigned char *str);
void sendString1        (unsigned char *str);
unsigned char volatile cha,i=0;

void main()
{
    unsigned char volatile no;
    lcd_init();
    serial_init();                 //initialise lcd display
    clear_display();
    printLcd(“SYSTEM INSTALING”);
    printLcd2(“..”);      

    while(1)
    {
        run1=recv_byte();
            if(isalpha(run1) != 0)  display_data(run1);
            else if(isdigit(run1) !=0) break;
    }
    display_data(run1);
    del_1s();
  
  }

void lcd_cmdwrt(unsigned char cmd)
{

      P1=cmd;
      RS=0;
    RW=0;
      EN=1;
      _nop_();
      _nop_();
      _nop_();
      EN=0;
      for(i=0;i<200;i++);    
      for(i=0;i<200;i++);
}

void lcd_datawrt(unsigned char *dat)
{
     while(*dat)
     {
           P1=*dat;
           RS=1;
        RW=0;
           EN=1;
           _nop_();
        _nop_();
        _nop_();
        EN=0;
        for(i=0;i<200;i++);
          for(i=0;i<200;i++);
           dat++;
     }
}
//LCD Routines
//clears the entire display area of LCD

void clear_display(void)
{
    write_in(0x01);            //clears the lcd display
    write_in(0x80);            //write code to blink at first line first coloum
}

    
//routine to display the value in the accumulator in LCD

void display_data(unsigned char ch)
{
    unsigned char dummy;

    dummy = ch;            //backup in variable
    write_data(ch);        //writes the value to LCD module
}
    
//routine to display a string on first line
//this routine will display a string stored at address pointed by dptr

void printLcd(unsigned char *str)
{
    unsigned char len,i;
    
    len = strlen(str);
    set_add(0x80);                //sets display position in first line
    for(i=0;i<len;i++)
    {
        display_data(*str);        //displays the character on LCD
        str++;
    }
}

void printLcd2(unsigned char *str)
{
    unsigned char len,i;
    
    len = strlen(str);
    set_add(0xc0);        //sets display position in second  line
    
    for(i=0;i<len;i++)
    {
        display_data(*str);    //displays the character on LCD
        str++;
    }
}

//routine to set the display position
    
void set_add(unsigned char ch)
{
    unsigned char dummy;
    
    dummy = ch;            //backup in variable
    write_in(ch);        //writes it as instruction
}

//routine to write an instruction to LCD

void write_in(unsigned char ch)
{
    RS=0;                //rs =0 for instr
    RW=0;            
    write(ch);            //routine to transfer 8 bits to LCD
}

//routine to write a data to LCD

void write_data(unsigned char ch)
{
    RS = 1;
    RW=0;                //rs = 1 for data
    write(ch);            //transfers 8 bits to lcd module    
}

//routine to transfer 8 bits to LCD module
    
void write(unsigned char ch)
{
    LCD_PORT = ch;        //preserves the old value of port
    EN = 1;                //enable pin high
    del_1ms();
    EN = 0;                //enable = 0
    del_1ms();
}

//routine to initialise the lcd

void lcd_init(void)
{
    del_30ms();            
    write_in(0x38);          //to make lcd
    del_3ms();
    write_in(0x0f);          //to make lcd to select 5×7 matrix display
    del_3ms();
     write_in(0x01);          //to make lcd to clear the display
    del_3ms();
    write_in(0x80);          //to make lcd cursor to bigining of first line
    del_3ms();
}

//SERIAL ROUTINES

void serial_init()
{
    SCON=0x50;                        //mode 1 serial communication
    TMOD=0x20;                        //timer 1 auto reload mode
    TH1=0xfd;                        //9600 baudrate at 11.0592 MHz
    TR1=1;
    EA=1;
    EX0=1;
    IT0=1;
    IP=0x10;
}

unsigned char recv_byte()
{
    unsigned char c;
    while(!RI);                        //waits till a byte is recieved
    RI = 0;
    c = SBUF;
    return(c);
}

void send_byte(unsigned char ch)
{
    TI = 0;
    SBUF = ch;
    while(!TI);
    del_1ms();
}

void sendString(unsigned char *str)
{
    while(*str != ‘’)
        send_byte(*str++);
}

//DELAY Routines

//Delay: 3 milli seconds
 
void del_3ms(void)
{
    unsigned char i,j;
    for(i=0;i<15;i++)
        for(j=0;j<98;j++);
}

//Delay: 30 milli seconds    
    
void del_30ms()
{
    unsigned char j;
    for(j=0;j<10;j++)
        del_3ms();
}

void del_1s()
{
    unsigned char i;
    for(i=0;i < 60;i++)
        del_30ms();
}

void del_1ms(void)
{
    unsigned char j;
    for(j=0;j<100;j++);
}

}

 

[nikhiljain]

The concept along with the code is given on the site. Pls search it..

[prem kumar]

Thank you for the above program…. I have a doubt, pls help me…

Can i simulate this in proteus.. If so, please help me how to do that, is there any way to use hyperterminal in proteus???

[Dexter]

YES IT IS POSSIBLE WITH THE SOFTWARE

wysiwyg_imageupload:3748:

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