main.c

easyarm 的主要程序

/****************************************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:         Li Baihua
** Modified date:       2008-04-08
** Version:             1.1
** Descriptions:        P0.16低电平触发外部中断0
**
*********************************************************************************************************/
#include "config.h"

#define   LED    1 << 17

/*********************************************************************************************************
** Function name:       Eint0IRQ
** Descriptions:        外部中断0服务程序
** input parameters:    无
** ouput parameters:    无
** Returned value:      无
*********************************************************************************************************/
void __irq Eint0IRQ(void)
{                                                                       /*  进入中断取反LED             */
    if ((IO0PIN & (1 << 17)) == 0) {                                        
        IO0SET = 1 << 17;                                               /*  熄灭发光二极管              */
    } 
    else {
        IO0CLR = 1 << 17;                                               /*  点亮发光二极管              */
    }
    
    while((IO0PIN & (1 << 16)) == 0);                                   /*  等待按键松开                */
    
    EXTINT = 0x01;                                                      /*  清中断标志                  */
    VICVectAddr = 0x00;                                                 /*  通知VIC中断处理结束         */
}


/*********************************************************************************************************
** Function name:       main
** Descriptions:        P0.16低电平触发外部中断主函数
** input parameters:    无
** ouput parameters:    无
** Returned value:      无
*********************************************************************************************************/
int main (void)
{
    PINSEL1 = PINSEL1 & (~0x03); 
    PINSEL1 = PINSEL1 | 0x01;                                           /*  设置P0.16为外部中断0管脚    */
    
    PINSEL1 = PINSEL1 & (~(0x03 << 2));                                 /*  设置P0.17为GPIO功能         */ 
    
    IO0DIR  = LED;                                                      /*  设置P0.17为输出             */
    IO0SET  = LED;                                                      /*  设置输出为高电平            */
    
    IRQEnable();                                                        /*  IRQ中断使能                 */
    
    EXTMODE  = 0x00;                                                    /*  设置外部中断为低电平触发    */
    EXTPOLAR = 0x00;

    VICIntSelect = 0 << 14;                                             /*  选择EINT0为FIQ中断          */
    VICVectCntl0 = 0x20 | 14;                                           /*  将外部中断0分配给向量中断0  */
    VICVectAddr0 = (uint32)Eint0IRQ;                                    /*  设置中断服务程序地址        */
    VICIntEnable = 1 << 14;                                             /*  使能EINT0中断               */

    EXTINT = 0x01;                                                      /*  清除EINT0中断标志           */
    
    while(1);
    return 0;
}
/*********************************************************************************************************
  END FILE
********************************************************************************************************/