C Program for 8051/52 microcontroller

GestureControlledRobot.c

#include<reg51.h>

#define cmdport P3
#define dataport P2
#define q 10
#define o 1

sbit s1 = (P0^1);
sbit s2 = (P0^2);
sbit s3 = (P0^3);
sbit s4 = (P0^4);
sbit d1 = (P1^1);
sbit d2 = (P1^2);
sbit d3 = (P1^3);
sbit d4 = (P1^4);
sbit en = (P1^5);

sbit rs = cmdport^2; //register select pin
sbit rw = cmdport^1; // read write pin
sbit e = cmdport^0; //enable pin

void delay(unsigned int msec) // Function to provide time delay in msec.
{
  int i,j ;
  for(i=0;i<msec;i++)
  for(j=0;j<550;j++);
}

void lcdcmd(unsigned char msg) //Function to send command to LCD
{
  dataport = msg;
  rs= 0;
  rw=0;
  e=1;
  delay(1);
  e=0;
}

void lcddata(unsigned char item) //Function to send data to LCD
{
  dataport = item;
  rs= 1;
  rw=0;
  e=1;
  delay(1);
  e=0;
}

lcddat(unsigned char *item) // function to send string to LCD
{
  int x;
  for(x=0;item[x]!=0;x++)
  {
    lcddata(item[x]);
  }
}

void main ()
{
  P1=0x00;
  P2=0x00;
  P3=0x00;
  delay(100);
  lcdcmd(0x38);
  delay(q);
  lcdcmd(0x01);
  delay(q);
  lcdcmd(0x0C);
  delay(q);
  lcdcmd(0x80);
  delay(q);
  lcddat("Wireless Gesture");
  lcdcmd(0xC0);
  delay(q);
  lcddat("Controlled Robot");
  delay(700);
  lcdcmd(0x01);
  delay(q);
  lcdcmd(0x81);
  delay(q);
  lcddat("Using AT89S52");
  delay(q);
  lcdcmd(0xC0);
  delay(q);
  lcddat("Micro-controller");
  delay(700);
  lcdcmd(0x38);
  delay(q);
  lcdcmd(0x01);
  delay(q);
  ;lcdcmd(0x0C);
  delay(q);
  lcdcmd(0x86);
  delay(q);
  lcddat("By:");
  delay(q);
  lcdcmd(0xC2);
  delay(q);
  lcddat("Pranjal Joshi");
  delay(650);
  while(1)
  {
    if (!s1 & !s2 & s3 & !s4)
    {
      en = 1;
      d1 = 1, d3 = 1;
      d2 = 0, d4 = 0;
      lcdcmd(0x38);
      delay(q);
      en=0;
      lcdcmd(0x01);
      delay(q);
      en=1;
      lcdcmd(0x0C);
      delay(q);
      lcdcmd(0x80);
      en=0;
      delay(q);
      lcddat("Receiving Signal .");
      en=1;
      delay(q);
      lcdcmd(0xC0);
      delay(q);
      en=0;
      lcdcmd(0x0C);
      delay(q);
      en=1;
      lcddat("GOING FORWARD ");
      delay(40);
      en=0;
    }
    if (!s1 & !s2 & !s3 & s4)
    {
      en = 1;
      d1 = 0, d3 = 0;
      d2 = 1, d4 = 1;
      lcdcmd(0x38);
      delay(q);
      en=0;
      lcdcmd(0x01);
      delay(q);
      en=1;
      lcdcmd(0x0C);
      delay(q);
      lcdcmd(0x80);
      delay(q);
      en=0;
      lcddat("Receiving Signal .");
      delay(q);
      en=1;
      lcdcmd(0xC0);
      delay(q);
      en=0;
      lcdcmd(0x0C);
      delay(q);
      en=1;
      lcddat("GOING REVERSE ");
      delay(40);
      en=0;
    }
    if (!s1 & s2 & !s3 & !s4)
    {
      en = 1;
      d1 = 0, d4 = 0;
      d2 = 1, d3 = 1;
      lcdcmd(0x38);
      delay(q);
      en=0;
      lcdcmd(0x01);
      en=1;
      delay(5);
      en=0;
      lcdcmd(0x0C);
      en=1;
      delay(5);
      en=0;
      lcdcmd(0x80);
      en=1;
      delay(q);
      en=1;
      delay(5);
      en=0;
      lcddat("Receiving Signal .");
      delay(q);
      lcdcmd(0xC0);
      delay(q);
      lcdcmd(0x0C);
      delay(q);
      lcddat("TURNING RIGHT ");
      en=1;
      delay(5);
      en=0;
      delay(2);
      en=1;
      delay(5);
      en=0;
      en=1;
      delay(5);
      en=0;
      delay(40);
    }
    if (s1 & !s2 & !s3 & !s4)
    {
      en = 1;
      d1 = 1, d4 = 1;
      d2 = 0, d3 = 0;
      lcdcmd(0x38);
      delay(q);
      en=0;
      lcdcmd(0x01);
      en=1;
      delay(5);
      en=0;
      lcdcmd(0x0C);
      en=1;
      delay(5);
      en=0;
      lcdcmd(0x80);
      en=1;
      delay(q);
      en=1;
      delay(5);
      en=0;
      lcddat("Receiving Signal .");
      delay(q);
      lcdcmd(0xC0);
      delay(q);
      lcdcmd(0x0C);
      delay(q);
      lcddat("TURNING LEFT ");
      en=1;
      delay(5);
      en=0;
      delay(2);
      en=1;
      delay(5);
      en=0;
      en=1;
      delay(5);
      en=0;
      delay(40);
    }
    if (!s1 & !s2 & !s3 & !s4)
    {
      en=0;
      d1=0;
      d2=0;
      d3=0;
      d4=0;
      lcdcmd(0x38);
      delay(q);
      lcdcmd(0x01);
      delay(q);
      lcdcmd(0x0C);
      delay(q);
      lcdcmd(0x80);
      delay(q);
      lcddat("No Signal ");
      delay(q);
      lcdcmd(0xC0);
      delay(q);
      lcdcmd(0x0C);
      delay(q);
      lcddat("STOP ");
      delay(40);
    }
  }
}