eint.c

ARM开发板,LPC2103中断功能部件

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  2004-09-16
** Last Version:		1.0
** Descriptions:		The main() function example template
**
**------------------------------------------------------------------------------------------------------
** Created by:			Chenmingji
** Created date:		2004-09-16
** Version:				1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************/
#include "config.h"

#define LED1 1 << 17
uint8 KeyCount = 0;
/*
void DelayNS(uint32 tim)
{
     uint32 i;
     while(tim--)
         for(tim = 0;tim < 50000;tim++);
}
*/
void __irq EINT0_ISR(void)
{
     KeyCount++;
     if(KeyCount % 3 == 0)
         IO0CLR = LED1;   //为3的整数倍亮
     else
         IO0SET = LED1;  //否则灭
         
     while(IO0PIN & (1 << 16) == 0);
     
     EXTINT = 0x01;    //清中断标志位
     VICVectAddr = 0x00;  //中断结束
}

int main (void)
{// add user source code 
     PINSEL1 = (PINSEL1 & (~0x03)) | 0x01;   //P0.16为EXINT0端口
     PINSEL1 = PINSEL1 & (~(0x03 << 2));    //P0.17为IO端口
     IO0DIR = LED1;    //P0.17设为输出
     IO0SET = LED1;
     
     EXTMODE = 0x00;   //外部中断方式为电平方式
     EXTPOLAR = 0x00;  //低电平
     
     VICIntSelect = 0x00;  
     VICVectCntl0 = 0x20 | 14;
     VICVectAddr0 = (uint32)EINT0_ISR;
     EXTINT = 0x01;   //清中断0标志位
     VICIntEnable = (1 << 14);
     
     IRQEnable(); 
      
     while(1);      
     return 0;
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/