arm下的按键测试代码



首先查看内核代码：linux/arch/arm/mach-s5pv210/mach-tq210.c，得到devicename为“gpio-keys”

确认输入子系统：

 cat /proc/bus/input/devices，得知gpio-keys的event信息为event0

#include <stdio.h>
#inlcude <linux/input.h>
#include <fcntl.h>
int main ()
{
  int keys_fd;
  char ret[2];
  struct input_event t;

  keys_fd = open ("/dev/input/event0", O_RDONLY);
  if (keys_fd <= 0)
    {
      printf ("open /dev/input/event0 device!\n");
      return 0;
    }

  while (1)
    {
      if (read (keys_fd, &t, sizeof (t)) == sizeof (t))
        {
          if (t.type == EV_KEY)
            if (t.value == 0 || t.value == 1)
        {
              printf ("key %d %s\n", t.code,
                      (t.value) ? "Pressed" : "Released");
          if(t.code==KEY_ESC)
              break;
        }
        }
    }
  close (keys_fd);

  return 0;
}