LPC2131的GPIO输出

原理图：

 程序清单：

/****************************************Copyright (c)**************************************************
*
**--------------File Info-------------------------------------------------------------------------------
** File name:   main.c
** Last modified Date:  2011-04-27
** Last Version:  1.0
** Descriptions:  The main() function example template
**------------------------------------------------------------------------------------------------------
** Created by:   lxliu
** Created date:  2011-04-27
** Version:    1.0
** Descriptions:  The original version
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************/
#include "config.h"

void DelayNS(uint32 dly)
{
 uint32 i;
 
 for(;dly>0;dly--)
  for(i=0;i<50000;i++);
}

int main (void)
{  
    uint32 i;                       //循环变量
    uint32 LED = (1<<18);           //P1[25:18]控制LED，初值指向LED1
    uint32 BEEP = (1<<7);           //P0.7控制蜂鸣器，低电平蜂鸣器蜂鸣
 PINSEL2 = PINSEL2 & (~0x08);    //P1[25:16]设置为GPIO功能
 PINSEL0 = 0x00000000;           //P0[15:0]设置为GPIO功能
 IO0DIR = BEEP;                  //设置BEEP控制口为输出
 IO0SET = BEEP;                  //蜂鸣器停止蜂鸣
 
 while(1)
 {
  for(i=0;i<8;i++)           //8个LED
  {
   IO1DIR = LED;          //当前的LED设置为输出
   IO1SET = LED;          //当前的LED熄灭
   DelayNS(100);          //延时
   IO1CLR = LED;          //当前的LED点亮
   DelayNS(100);          //延时
   IO1SET = LED;          //当前的LED熄灭
   LED =(LED<<1);         //左移一位，
  }
  
  IO0CLR = BEEP;            //8个LED点亮一遍后，蜂鸣器蜂鸣
  DelayNS(100);               //延时
  IO0SET = BEEP;           //蜂鸣器停止蜂鸣
  DelayNS(500);              //延时
  LED = (1<<18);            //为LED赋初值
 }
  
    return 0;
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/