Help with serial communication

[Julian]

Hi, 

I’m trying to do serial communication between 8051 and virtual terminal in Proteus. Whatever that is typed on the terminal, I wish to display it on the LCD. Problem : I can’t type anything on the terminal. Only the cursor is blinking. Below is my code, please correct me if there is any mistakes.

=================================================

 

#include <reg51.h>

#define lcd_port P2

 

int j;

sbit rs = P0^5;

sbit rw = P0^6;

sbit en = P0^7;

 

void delay(unsigned int msec)  

{

int i,j ;

for(i=0;i<msec;i++)

for(j=0;j<200;j++);

}

 

void lcdcmd(unsigned char value)

{

rs = 0;

rw = 0;

lcd_port = value;

en = 1;

delay(1);

en = 0;

}

 

void lcd_data(unsigned char display)

{

rs = 1;

rw = 0;

lcd_port = display;

en = 1;

delay(1);

en = 0;

}

 

void lcd_init()

{

lcdcmd(0x38);

delay(150);

lcdcmd(0x0E);

delay(150);

lcdcmd(0x01);

delay(150);

lcdcmd(0x06);

delay(150);

lcdcmd(0x80);

delay(150);

}

 

void main(void)

{

char word;

lcd_init();

TMOD = 0x20;

TH1 = 0xFD;

SCON = 0x50;

TR1 = 1;

 

while(1)

{

while (RI == 0);

word = SBUF;

lcd_data(word);

RI = 0;

}

}

==============================================

 

Not much experience in programming and first time doing serial comm, help will be much appreciated. Thanking in advance. 

[Julian]

Problem solved! 

[Dexter]

TRY THIS

MY WORKING CODE

 

 

#include………

…………..

…………

 

//  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 enter(void);

 

 

void main()
{

unsigned char A;

serial_init();
sendString(“WELCOME TO RS232 COM1”);
enter();
sendString(“DEXTER8051”);
enter();

 

A=recv_byte()

…………………

………………

………………

}

 

 

/*SENDING THE ENTER CAMMAND*/
void enter()
{
    send_byte(0x0d);       //  <CR>
    send_byte(0x0a);        // <LF>
}

/*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;
}
/* RECIVING BIT FROM PC*/
unsigned char recv_byte()
{
    unsigned char c;
    while(!RI);                        //waits till a byte is recieved
    RI = 0;
    c = SBUF;
    return(c);
}
  /* SENDING BIT TO PC*/
void send_byte(unsigned char ch)
{
    TI = 0;
    SBUF = ch;
    while(!TI);
    del_1ms();
}
/* SENDING STRING BIT TO PC*/
void sendString(unsigned char *str)
{
    while(*str != ‘’)
    send_byte(*str++);
}

 

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