arm7外部中断简要分析

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1、对《深入浅出arm7lpc》的中断例子进行修改后的运行情况      外部中断   唤醒功能   执行中断程序（取中断程序与等待中断程序部分）为了便于观察，我把原理图中的蜂鸣器换成了led灯，源程序请查看《深入浅出arm7lpc》1。源程序（唤醒不执行中断）  while(1)  {             PCONP=0x00;             PCON=0x02;             if((IO0SET&BEEP)==0)                        IO0SET=BEEP;              else                 

2、       IO0CLR=BEEP;              EXTINT=0x01;  }运行情况：按键按下，灯亮一下，就灭掉分析：按键后唤醒芯片，执行灯亮，然后清中断标志，然后再次掉电，灯灭注释掉EXTINT=0x01;      运行情况一样，说明没使能中断的情况下，中断标志不影响   IRQEnable();2。原程序（唤醒+执行中断） void__irqIRQ_Eint0(void){     while((EXTINT&0x01)!=0)     {         EXTINT=0x01;    }        VICVectAddr=0;}  while(1

3、)  {            PCONP=0x00;             PCON=0x02;             if((IO0SET&BEEP)==0)                         IO0SET=BEEP;              else                         IO0CLR=BEEP;                     //         EXTINT=0x01;  }运行情况：按键，led灯亮，再按键，led灯灭修改1.void__irqIRQ_Eint0(void){        if((IO0SET&

4、BEEP)==0)                   IO0SET=BEEP;         else                   IO0CLR=BEEP;      //     EXTINT=0x01;         VICVectAddr=0;}  while(1)  {           PCONP=0x00;           PCON=0x02; }运行情况：原来灯灭，按键后灯闪烁，再按键没反应，保持闪烁分析：中断程序中没清中断标志，使一直响应中断修改2。void__irqIRQ_Eint0(void){        if((IO0SET&BEEP

5、)==0)                   IO0SET=BEEP;         else                   IO0CLR=BEEP;          EXTINT=0x01;         VICVectAddr=0;}  while(1)  {           PCONP=0x00;           PCON=0x02; }运行情况：原来灯灭，按住键，灯闪烁，松手，灯保持松手前最后状态（加上按键去抖动，也许无法解决，这是根据电平变化响应中断）修改3。 void__irqIRQ_Eint0(void){        EXTINT=0x01

6、;        VICVectAddr=0;}运行情况：与原程序(唤醒加中断)一样。                           注释掉VICVectAddr=0;也一样修改4。 void__irqIRQ_Eint0(void){}  while(1)  {            PCONP=0x00;             PCON=0x02;             if((IO0SET&BEEP)==0)                         IO0SET=BEEP;              else                         

7、IO0CLR=BEEP;                              EXTINT=0x01;  } 按键没反应，一直响应中断，一直在中断程序中运行。修改5。 void__irqIRQ_Eint0(void){            EXTINT=0x01；}             PCONP=0x00;             PCON=0x02;  while(1)  {             if((IO0SET&BEEP)==0)