Problem with serial communication

[Julian]

Hi, I’m doing serial communication between 8051 and PC and data will be displayed on LCD. Baud rate used is 9600 and crystal’s frequency is 11.0592MHz. When I type ‘ABC’ on the PC, the LCD will only display ‘AC’ but if i type ‘A B C’ meaning there is a space between the characters then the LCD can display ‘ABC’ as wanted. Does anyone know what is the problem? I googled and found people saying about using a buffer but i’m not sure how. 

[nikhiljain]

check the code step by step. there seems to be some logical error.

[nikhiljain]

post your code here..

[Julian]

 

#include <reg51.h>

#include <stdio.h>

#define lcd_port P1

 

int j;

unsigned char word;

sbit rs = P3^5;

sbit rw = P3^6;

sbit en = P3^7;

sbit BUT_serial = P0^0;

sbit LED_serial = P2^0;

char morning[]={“Gd morning LeeYJ!”};

 

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 shift_left()

{

lcdcmd(0x18);

delay(250);

}

 

void lcd_mrg()

{

for (j=0; morning[j]!=’’;j++)

{

  lcd_data(morning[j]);

  delay(100);

}

}

 

void serial()

{

int m;

lcdcmd(0x01);

delay(150);

 

for(m=0; m<=15; m++)

{

while (RI == 0);

word = SBUF;

lcd_data(word);

RI = 0;

}

 

lcdcmd(0xC0);

for(m=0; m<=15; m++)

{

while (RI == 0);

word = SBUF;

lcd_data(word);

RI = 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)

{

lcd_init();

lcd_mrg();

shift_left();

TMOD = 0x20;

TH1 = 0xFD;

SCON = 0x50;

TR1 = 1;

 

while(1)

{ 

if(!BUT_serial)

{

LED_serial = 0;

serial();

if (RI == 0)

{

shift_left();

}

}

 

else 

{

shift_left();

}

 

}

}

 

This is my code. Your help will be much appreciated. 

[Syed Aameer]

buffer means say for in your program you are using word as variable to store SBUF value..

 

declare the word as Word[15]..

then in recieviing Program

 

while(RI==0);

Word[i++]=SBUF;

 

 

where i=0;

then diplay the Word value in for loop..

 

Hope this may help you

[Author]

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