/*  Name     : main.c
 *  Purpose  : Source code for BUZZER Interfacing with AT89C52.
 *  Author   : Gemicates
 *  Date     : 2014-01-17
 *  Website  : www.gemicates.com
 *  Revision : None
 */
 
#include <REGX52.H>									// header file for AT89c52 series
#define input P1											
sbit Buzzer=P3^2;									// GPIO direction register declaration

void delay(unsigned int count);

void main()									        // main function
{
	input = 0xFF;									// Port 1 make as a output port
	while(1)
	{
		switch(input)								// Switch statement
		{
			case 0xFE:
				Buzzer = 0;
				delay(100);
				Buzzer = 1;
			  delay(100);
			break;
			
			case 0xFD:
				Buzzer = 0;
				delay(100);
				Buzzer = 1;
				delay(100);
			break;
			
			case 0xFB:
				Buzzer = 1;
				delay(100);
				Buzzer = 0;
				delay(100);
			break;
			
			case 0xF7:
				Buzzer = 1;
				delay(100);
				Buzzer = 0;
				delay(100);
			break;
			
			case 0xEF:
				Buzzer = 1;
				delay(100);
				Buzzer = 0;
				delay(100);
			break;
			
			case 0xDF:
				Buzzer = 1;
				delay(100);
				Buzzer = 0;
				delay(100);
			break;
			
			case 0xBF:
				Buzzer = 1;
				delay(100);
				Buzzer = 0;
				delay(100);
			break;
			
			case 0x7F:
				Buzzer = 1;
				delay(100);
				Buzzer = 0;
				delay(100);
			break;
			
		}
	}
}

void delay(unsigned int count)		                                                  //delay function declaration
{
	int i,j;
	for(i=0;i<count;i++)
	for(j=0;j<12750;j++);
}