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UART-Keypad-lcd interfacing with 8051

bobparihar

New Member
i am doing a project in which there is a serial communication between two 8051 microcontroller.
at transmitting side there is a 4x4 keypad attached at one of the port of 8051
at receiving side there is a 16x2 LCD attached
i am simulating it on Proteus first... but there is an error as soon as i start the simulation of the program..
i am unable to understand this error.. ( see the attached screenshot of protues)

help me to get rid of this error

upload_2015-2-27_17-7-22.png

this is code of transmitting side.............................


C:
#include<reg51.h>

void serial(void);
void serial(void)
{
  TMOD=0x20;        //timer 1, mode 2(8-bit autoreload) to set baud rate
TH1=0xFD;        //-3 to TH1 for 9600 baud rate
SCON=0x50;        // 8 bit txion, 1 start 1 stop bit, REN enable for both txfr and rxve
TR1=1;         // start timer
}
void trans(unsigned char);
void trans(unsigned char a)
{
  SBUF=a;
  while(TI==0);
  TI=0;

}

void main()
{

unsigned int ar[]={0xE7,0xD7,0xB7,0x77,0xEB,0xDB,0xBB,0x7B,0xED,0xDD,0xBD,0x7D,0xEE,0xDE,0xBE,0x7E};

unsigned int a,b,c,i;

    serial();
while(1)
{
       P1=0x0F;
       while(P1==0x0F);
       a=P1;
       P1=0xF0;
       b=P1;
       c=a|b;
       for(i=0;i<16;i++)
         {
           if (ar[i]==c)
           trans(i);
         }
       }
}
now this is code of receiving side.................................................

C:
#include"lcd1.h"
void main()
{
int a;
init();
TMOD=0x20;        //timer 1, mode 2(8-bit autoreload) to set baud rate
TH1=0xFD;        //-3 to TH1 for 9600 baud rate
SCON=0x50;        // 8 bit txion, 1 start 1 stop bit, REN enable for both txfr and rxve
TR1=1;         // start timer
while(1)
{
  while(RI==0);      // check if all the bytes get received
  a=SBUF;        // place sbuf in a
  num(a);
  RI=0;          // clear RI so that another byte will recive
}
}



[B]header file code for lcd..[/B]
#include<reg52.h>
sbit rs=P3^2;
sbit rw=P3^3;
sbit en=P3^4;
void dat(unsigned char);
void cmd(unsigned char);
void delay(unsigned int); 
void print(unsigned char *);
void init();
void num(unsigned int);


void init()
{
 
   cmd(0x38);
   delay(100);
   cmd(0x0E);
   delay(100);
   cmd(0x06);
   delay(100);
   cmd(0x01);
   delay(100);
   cmd(0x80);
   delay(100);


 
}

void cmd(unsigned char x)
{
  P2=x;
   rs=0;
   rw=0;
   en=1;
   delay(1);
   en=0;
}
void dat(unsigned char y)
{
   P2=y;
   rs=1;
   rw=0;
   en=1;
   delay(1);
   en=0;
}
void delay(unsigned int z)
{
  int j,i;
   for(i=0;i<z;i++)
   {
     for(j=0;j<1275;j++);
   
   }
}
void print(unsigned char *p)
{
 
   while(*p!='\0')
   {
     dat(*p);
     p++;
   }

}
void num(unsigned int a)
{
   int b,c=1;
   b=a;
   while(b>9)
   { 
     b=b/10;
 
     c=c*10;
   }
 

   while(c!=0)
   {   delay(50);
     dat((a/c)+48);
     a=a%c;
     c=c/10;
   
   }
}
 
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