test-b-a.c

这是一个基于S3C2410的8位按键的驱动程序源代码

#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
 #include<time.h>
main()
{
  int retval;
   int fileno;
   int ts, maxfd;
   int  ret= 0,i,j;
   int number;
int size;

   fileno = open("/dev/buttons",O_RDWR);

 if (fileno == -1)
    {
      printf("open device led errr!\n");
      return 0;
    }
/*if(select(fileno+1,NULL,NULL,NULL,NULL)<0)
{
printf("select error");
}
*/
   while(1)
 {
  number=0;
  size=read(fileno,&number,1);
if(number!=0)
 {
  printf("read %d number\n",size);
  printf("key=%d\n",number);
  usleep(200000); 
    }
}  
   close(fileno);
   return 0;
}