turnled.c

Six objects here: The document you re reading & its Chinese version Set of "HWDesign" includes

#include <stdio.h>    /* Hey! C U again!! */
#include "usb-mn-ioctls.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <asm/types.h>

int main(int argc,char *argv[]) 
{
  int fd;
  __u16 LEDnum;
        
  if (argc!=3) {
    printf("turnLED usage: turnLED <LEDcmd> <LEDnum>\n");
    printf("\tLEDcmd:0->turn off; LEDcmd:1->turn on\n");
    printf("\tLEDnum:0->1st LED; LEDnum:1->2nd LED; LEDnum:A->both of them\n");
    return -1;
  }
  /* argv[1] stands for command, now: 0(->turn off LED) or 1(->turn on LED)
   * argv[2] stands for arg, now: 0(->1st LED) or 1(->2nd LED) or A(->both)
   */
  
  fd=open("/dev/MiniNurse",O_WRONLY);
  if (fd<0) {
    printf("CanNOT open Device.\n");
    exit(-1);
  }  
  switch (*argv[2]) {
    case '0':
      LEDnum = 0x04;
      break;
    case '1':
      LEDnum = 0x08;
      break;
    case 'A':
      LEDnum = 0x0C;
      break;
  default:
    printf("arg:%c to this cmd is error!\n",*argv[2]);
    exit(-1);
  }
      
  switch (*argv[1]) {
    case '1':
      ioctl(fd,MN_LEDon,LEDnum);
      break;
    case '0':
      ioctl(fd,MN_LEDoff,LEDnum);
      break;
  default:
    printf("cmd:%c is not support!\n",*argv[1]);
    exit(-1);
  }

  close(fd);
  return 0;
}