Simple Serial Communication Using 8051

Code:

#include <REGX51.H>
#include <stdio.h>                /* prototype declarations for I/O functions */
sbit MES1 = P2^0; 
sbit MES2 = P2^1; 
sbit MES3 = P2^2; 
sbit MES4 = P2^3; 
sbit MES5 = P2^4; 
int i;
void time1ms();
void delay(int n);
void main (void)  {               /* execution starts here after stack init   */
  SCON  = 0x52;                   /* SCON: mode 1, 8-bit UART, enable rcvr    */
  TMOD |= 0x20;                   /* TMOD: timer 1, mode 2, 8-bit reload      */
  TH1   = 0xfd;                   /* TH1:  reload value for 9600 baud@11.0592mhz         */
  TR1   = 1;                      /* TR1:  timer 1 run                        */
  TI    = 1;                      /* TI:   set TI to send first char of UART  */
  

  while (1) {
   P2=0xFF;   
      if (MES1 == 0)
      {
  printf ("Welcome Serial Data Transfer\n ");
  printf ("Inside Conditional 1\n ");
  delay(1000);
      } 
      if (MES2 == 0)
      {
      printf ("Inside Conditional 3\n ");
  delay(1000);
      } 
  if (MES3 == 0)
      {
  printf ("Inside Conditional 3\n ");
  delay(1000);
  } 
   if (MES4 == 0)
      {
     printf ("Inside Conditional 4\n ");
  delay(1000); 
      }  
   if (MES5 == 0)
      {
  printf ("Inside Conditional 5\n ");
  printf ("Data transmission successful\n\n ");
  delay(1000); 

      } 
   }                           
}

void time1ms()    /* 1 ms delay  */
{
 int i;
 for(i=0;i<50;i++); // the value shown in this line, 50 was calibrated for 1ms
  // you may change it!
}

void delay(int n)      /* do nothing n*1ms */
{
    int i;
    for(i=0;i<n;i++)
    time1ms(); 

 }