国嵌实验：key_interrupt(按键中断),采用中断方式当KEY1 按下时,LED亮灭一次

#define GLOBAL_CLK1

#include <stdlib.h>

#include <string.h>

#include "def.h"

#include "option.h"

#include "2440addr.h"

#include "2440lib.h"

#include "2440slib.h"

#include "mmu.h"

#include "profile.h"

#include "memtest.h"

void key_init(void);

static void __irq key_handler(void);

/*************************************************

延时函数

**************************************************/

void delay(int times)

{

int i,j;

for(i=0;i<times;i++)

for(j=0;j<400;j++);

}

/*************************************************

LED初始化

**************************************************/

void Led1_init(void)

{

rGPBCON &= ~(3<<10);

rGPBCON |= (1<<10);

}

/*************************************************

点亮LED

**************************************************/

void Led1_run(void)

{

rGPBDAT &=~(1<<5); /*LED亮还是灭？*/

delay(1000);

rGPBDAT |=(1<<5);

delay(1000);

}

/*************************************************

主函数

**************************************************/

void Main(void)

{

MMU_Init();

Led1_init();

key_init();

while(1);

}

/*************************************************

按键初始化

**************************************************/

void key_init(void)

{

rGPGCON &= ~(0x3<<0);

rGPGCON |= (0x2<<0);//GPG0 [1:0]--->10 = EINT[8] 设置GPG0为中断模式

rEXTINT1 &= ~(0xf<<0); //EINT8 [2:0] ----> 000 = Low level

//FLTEN8 [3] ------->0 = Filter Disable

rEINTPEND |= (1<<8); //EINT8 [8] It is cleard by writing “1”

rEINTMASK &= ~(1<<8); //EINT8 [8]--------> 0 = enable interrupt 允许EINT8中断

/*设置ISR*/

pISR_EINT8_23=(U32)key_handler;//将中断服务函数的地址传给对应的中断向量表位置

EnableIrq(BIT_EINT8_23);

//#define EnableIrq(bit)rINTMSK &= ~(bit)

//EINT8_23 [5] ---->0 = Service available, 1 = Masked

}

/*************************************************

按键中断处理函数

**************************************************/

static void __irq key_handler(void)

{

/*判断是否是按键K1产生的中断*/

if(rINTPND==BIT_EINT8_23) //INTPND:EINT8_23 [5] 0 = Not requested, 1 = Requested

{

ClearPending(BIT_EINT8_23);

if(rEINTPEND&(1<<8))

rEINTPEND |= 1<< 8;//清EINT8中断

Led1_run();

}

}

在2440addr.h头文件中:

#define BIT_EINT8_23 (0x1<<5)

__inline void ClearPending(int bit)

{

register i;

rSRCPND = bit;//清EINT8_23中断

rINTPND = bit;//清EINT8_23中断

i = rINTPND;

}