/*  Name     : main.c
 *  Purpose  : Source code for LED Interfacing with AT89C52.
 *  Author   : Gemicates
 *  Date     : 2014-01-12
 *  Website  : www.gemicates.org
 *  Revision : None
 */
 
#include <REGX52.H>						//header file for AT89c52 series

#define ledport P0						//To set a port pins as output
sbit LED9=P3^7;							//To set a single pin(P3.7) as output
sbit LED10=P1^6;						//To set a single pin(P1.6) as output
sbit SW	 =P1^7;							//To set a single pin(P1.7) as output

unsigned char log=0;					        //Global variable declaration

void delay(int msec)					        //delay function declaration
{							        //This function produces a delay in msec
	int i,j;
	for(i=0;i<msec;i++)
	for(j=0;j<1275;j++);
}


void main()							//main function
{
	SW=0;							//make as a input pin P1^7
	while(1)						//Repeat(loop) forever
	{
		//port declaration
		ledport=0x00;					//P0 LEDs will be ON
		delay(50);
		ledport=0xFF;					//P0 LEDs will be OFF
		
		//single pin declaration
		LED9=0;						//LED 9 will be ON state
		delay(50);					//function call for delay
		LED9=1;						//LED 9 will be OFF state
		delay(50);
		
		//push button declaration
		if((SW==1)&&(log==0))			        //LED turn ON using Push Button
		{
			LED10=0;
			delay(50);
			log=1;
		}
		if((SW==1)&&(log==1))
		{
			LED10=~LED10;				// Toggle state
			delay(50);
			log=0;
		}
		
	}
}