//---------------------------------------------------------------------------------------//
//            This program flashes led's attached to Port.0                              //
//This code is written by Mubashar Yasin(Islamabad,Pakistan).It is freely distributable  //
//however please distribute it with my name and if you add this code to your website or  // 
//some other publication then mention about me along with this code.I have tested this   //
//code to work properly even then there is no guarantee or warranty and i cannot be held // 
//responsible for any damage or loss due to this code.If you have any querries about this//
//code please contact me at:                                                             // 
//                                                                                       //   
//  kool_projects@yahoo.com                                                              //
//  mubasharpk09@hotmail.com                                                             //
//                                                                                       //
//or visit my website:                                                                   //
//                                                                                       // 
//  http://www.geocities.com/kool_projects                                               // 
//---------------------------------------------------------------------------------------//
	#include <AT89X51.H>

	void delay(void)
 	{
	unsigned int x;
	for(x=0;x<10000;x++){}
 	}

	main()
	{
	unsigned int k;
	unsigned char j;
 
	while (1) {
      
      	
      	for(k=0;k<10;k++)//starting sequence
	  	{
	  	P0=0xFF;
	  
	  	delay();
	  	delay();
	  
	  	P0=0x00;
	  
	 	delay();
	  	delay();
	  	}//end starting sequence
      
      	       
      	for(k=0;k<15;k++)//first sequence
	  	{
      	for (j=0x01; j< 0x80; j<<=1)  
        	{  
      	P0 = j;                         
      
      	delay();                       
     
        	}//end for

    	for (j=0x80; j> 0x01; j>>=1)  
        	{   
      	P0 = j;                         
        
      	delay();                       
       
        	}//end for
	  	}//end first sequence
	  
	  	
	  	for(k=0;k<15;k++)//second sequence
	  	{
       		P0=0x0F;
 	   
	   	delay();
	   	delay();
	   
	   	P0=0xF0;
	   
	   	delay();
	   	delay();
	  	}//end second sequence

	  	
	  	for(k=0;k<15;k++)//third sequence
	  	{
	  	P0=0xAA;
	  
	  	delay();
	  	delay();
	  
	  	P0=0x55;
	  
	  	delay();
	  	delay();
	  	}//end third sequence
       }//end while
 	}//end main