mian.c

meg16 的所有功能实例

/****************************************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			PD7--->Sound_EN
**描述：读取PD2的输入电平,及按键K0的状态，确认被按下后，将蜂鸣器使能。
**      最简单的DIO测试，按键0为DI输入，蜂鸣器为DO输出。
*******************************************************************************************************/
#include <iom16v.h>
#include <macros.h>

void main(void)
{
 //蜂鸣器端口初始化
 DDRD |=0x80;	   	//设置PD7为输出   	   						
 PORTD|=0x80;		//设置PD7为高电平
 
 //按键0端口初始化
 DDRD &=~0x04;	   	//设置PD2为输入   	   						
 PORTD|=0x04;		//设置PD2为上拉
 
 while(1)
     {
	 if((PIND&0x04)==0x00)  //读取按键状态
	     {
		 PORTD&=~0X80;		//低电平驱动
		 }
     else
	 	 {
		 PORTD|=0X80;		//高电平暂停
		 }
	 }
}