hello.c

来自「s3c44b0 uclinux gpio驱动测试程序。程序每隔一秒扫描一次相应的」· C语言 代码 · 共 51 行

#include<stdio.h>
#include<fcntl.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<sys/ioctl.h>
#include<unistd.h>
#include"gpio.h"

int main(void)
{
 int fd = -1;
 unsigned long pin;
 printf("hello world ni hao\n");
 fd = open("/var/gpiog",0);
 if(fd<0)
  {
   printf("\nCan't open this file!\n");
   return -1;
  }

 ioctl(fd,GPIO_SET_PIN_IN,8);
 while(1)
 {
   ioctl(fd,GPIO_READ_ALL_PORT,&pin);
   if((pin&0x000000F0)!=0xF0)
    {
     pin = pin&0x000000F0;
     if(pin == 0x000000E0)
        printf("\nyou hit  key 0!\n");
     else
     if(pin == 0x000000D0)
        printf("\nyou hit  key 1!\n");
     else
     if(pin == 0x000000B0)
        printf("\nyou hit  key 2!\n");
     else
     if(pin== 0x00000070)    
        printf("\nyou hit  key 3!\n");
      else
       {
        printf("\nESC.........\n");
        break;
       }
    } 
  sleep(1); 
 }
 printf("\nclose gpio!\n");
 close(fd);
 return 0;
}