/****************************************Copyright (c)**************************************************
**                               ADEmbed Development Co.,LTD.                                    
**                                 http://www.adembed.com
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  2008-12-13
** Last Version:		1.0
** Descriptions:		DI Test.
** 
**------------------------------------------------------------------------------------------------------
** Created by:			junbolu
** Created date:		2008-12-13
** Version:				1.0
** Descriptions:		
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
**------------------------------------------------------------------------------------------------------
**ICC-AVR application builder : 2008-12-13
**Target : M16
**Crystal: 7.3728Mhz
**PD2--->K0
**描述：讀取PD2的輸入電平,及按鍵K0的狀態，確認被按下后，將蜂鳴器使能。
**      最簡單的DIO測試，按鍵0為DI輸入，蜂鳴器為DO輸出。
*******************************************************************************************************/
#include <iom16v.h>
#include <macros.h>

void main(void)
{
 //蜂鳴器端口初始化
 DDRD |=0x80;	   	//設置PD7為輸出   	   						
 PORTD|=0x80;		//設置PD7為高電平
 
 //按鍵0端口初始化
 DDRD &=~0x04;	   	//設置PD2為輸入   	   						
 PORTD|=0x04;		//設置PD2為上拉
 
 while(1)
     {
	 if((PIND&0x04)==0x00)  //讀取按鍵狀態
	     {
		 PORTD&=~0X80;		//低電平驅動
		 }
     else
	 	 {
		 PORTD|=0X80;		//高電平暫停
		 }
	 }
}