原创 ADS——GPIO口输入实验 YLP-S3C2440

#include "2440addr.h"<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

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

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

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

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

#define LED1  (1 << 4)  //GPF4

#define LED2  (1 << 5)  //GPF5

#define LED3  (1 << 6)  //GPF6

#define LED4  (1 << 7)  //GPF7

void Init()

{

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

       rGPFCON = rGPFCON & (~(3<<0));                //set GPF[0] input

       rGPGCON = rGPGCON & (~(3<<10));                    //set GPG[5] input

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

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

}

void key_on_light()

{

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

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

       if (rGPFDAT & KEY1)  {

              rGPFDAT |= LED1;                                   //熄灭LED1

       }

       else {

              rGPFDAT &= ~LED1;                               //点亮LED1

       }

       if (rGPGDAT & KEY3)  {

              rGPFDAT |= LED3;                                   //熄灭LED3

       }

       else {

              rGPFDAT &= ~LED3;                               //点亮LED3

       }

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

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

       if (rGPFDAT & KEY1)  {

              rGPFDAT |= LED2;                                   //熄灭LED2

       }

       else {

              rGPFDAT &= ~LED2;                               //点亮LED2

       }

       if (rGPGDAT & KEY4)  {

              rGPFDAT |= LED4;                                   //熄灭LED4

       }

       else {

              rGPFDAT &= ~LED4;                               //点亮LED4

       }

}

void Main()

{

       Init();

       while(1) {

              key_on_light();

       }

}