原创 外部中断 key YLP-S3C2440

Register       Address R/W              Description                 Reset Value<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

EXTINT0 0x56000088 R/W External Interrupt control Register 0 0x000000

EXTINT1 0x5600008c R/W External Interrupt control Register 1 0x000000

EXTINT2 0x56000090 R/W External Interrupt control Register 2 0x000000

 

 

 

 

 

 

 

PRIORITY

 

 #define ClearPending(bit) {\
                rSRCPND = bit;\
                rINTPND = bit;\
                rINTPND;\
                }

 

 

 

 

#define BIT_EINT8_23   (0x1<<5)

 

 

 

If an interrupt mode is set to FIQ mode in the INTMOD register, FIQ interrupt will not affect both INTPND and
INTOFFSET registers. In this case, the two registers are valid only for IRQ mode interrupt source.

 

 

 

 

 

 

 

 

#include "2440addr.h"

#define    KEY1      (1 << 0)  //GPF0,EINT0       GPB6

#define    KEY2      (1 << 0)  //GPF0,EINT0       GPB7

#define    KEY3      (1 << 5)  //GPG5,EINT13     GPB6

#define    KEY4      (1 << 5)  //GPG5,EINT13     GPB7

 

#define LED1  (1 << 4)  //GPF4

#define LED2  (1 << 5)  //GPF5

#define LED3  (1 << 6)  //GPF6

#define LED4  (1 << 7)  //GPF7

 

void __irq IRQ_KEY12()

{

    ClearPending(BIT_EINT0);

    rEINTPEND = 0xffffff;

    rGPFCON = rGPFCON & (~(3 << 0) );             //设置为输入状态

 

       rGPBDAT = rGPBDAT & (~(1<<6));                 //set GPB6 low

       rGPBDAT = (rGPBDAT | (1<<7));                     //set GPB7 high

       if (rGPFDAT & KEY1)  {

              rGPFDAT |= LED1;                                   //熄灭LED1

       }

       else {

              rGPFDAT &= ~LED1;                               //点亮LED1

       }

      

       rGPBDAT = rGPBDAT & (~(1<<7));                 //set GPB7 low

       rGPBDAT = (rGPBDAT | (1<<6));                     //set GPB6 high

       if (rGPFDAT & KEY2)  {

              rGPFDAT |= LED2;                                   //熄灭LED2

       }

       else {

              rGPFDAT &= ~LED2;                               //点亮LED2

       }

    rGPFCON |= (2 << 0);                              //重新设置外部中断输入功能

}

 

 

void __irq IRQ_KEY34()

{

    ClearPending(BIT_EINT8_23);

    rEINTPEND = 0xffffff;

    rGPGCON = rGPGCON & (~(3 << 5) );            //设置为输入状态

   

       rGPBDAT = rGPBDAT & (~(1<<6));                 //set GPB6 low

       rGPBDAT = (rGPBDAT | (1<<7));                     //set GPB7 high

       if (rGPGDAT & KEY3)  {

              rGPFDAT |= LED3;                                   //熄灭LED3

       }

       else {

              rGPFDAT &= ~LED3;                               //点亮LED3

       }

      

       rGPBDAT = rGPBDAT & (~(1<<7));                 //set GPB7 low

       rGPBDAT = (rGPBDAT | (1<<6));                     //set GPB6 high

       if (rGPGDAT & KEY4)  {

              rGPFDAT |= LED4;                                   //熄灭LED4

       }

       else {

              rGPFDAT &= ~LED4;                               //点亮LED4

       }

    rGPGCON |= (2 << 5);                              //重新设置外部中断输入功能

}

 

void eint_init()

{

       rGPFCON = rGPFCON & (~(3<<0)) | (2 << 0); 

       rGPGCON = rGPGCON & (~(3<<10)) | (2 << 10);        //设置外部中断输入功能

       rEXTINT0 = rEXTINT0 & (~(7 << 0));                          //EINT0低电平触发中断

       rEXTINT1 = rEXTINT1 & (~(7 << 20));                       //EINT13低电平触发中断

       pISR_EINT0 = (unsigned int)IRQ_KEY12;

       pISR_EINT8_23 = (unsigned int)IRQ_KEY34;             //设置中断入口函数

       rPRIORITY = 0x00000000;                                           // 使用默认的固定的优先级

       ClearPending(BIT_EINT0);                                           // 清除中断标志位

       ClearPending(BIT_EINT8_23);

       rEINTPEND = 0xffffff;                                                // 清除中断信号

       rINTMOD = 0x00000000;                                          // 所有中断均为IRQ中断

       rINTMSK &= ~( (BIT_EINT0) | (BIT_EINT8_23) ); // 使能外部中断0、8_23

       rEINTMASK &= ~(1 << 13);                                    //使用能EINT13

}

 

void Init()

{

       rGPFCON = (rGPFCON & 0x00ff) | 0x5500;            //set GPF[7:4] output

       rGPFDAT |= LED1 | LED2 | LED3 | LED4;         //熄灭

       rGPBCON = (rGPBCON & (~((3<<12)|(3<<14)))) \

                            | ( (1<<12)|(1<<14) );                  //set GPB[7:6] output

       rGPBDAT = rGPBDAT & (~((1<<6) | (1<<7)));

}

 

void Main()

{

       Init();

       eint_init();

       while(1) {

              rGPBDAT = rGPBDAT & (~((1<<6) | (1<<7)));

       }

}