这个两个结构体怎么存放我的数据

  情况:控制一个USB HID类设备
发送命令给HID类设备
命令: Byte0: 0x02   (report_id)
        Byte1: 0x13    (command)

数据结构:
  /* This might be useful to know:
To actually send a value to the device, perform a SUSAGE first, followed by a SREPORT.
#define HIDIOCSUSAGE            _IOW('H', 0x0C, struct hiddev_usage_ref)
struct hiddev_usage_ref {
       unsigned report_type;
       unsigned report_id;
       unsigned field_index;
       unsigned usage_index;
       unsigned usage_code;
       __s32 value;
}

#define HIDIOCSREPORT              _IOW('H', 0x08, struct hiddev_report_info)
struct hiddev_report_info {
       unsigned report_type;
       unsigned report_id;
       unsigned num_fields;
};
To do a GUSAGE/SUSAGE, fill in at least usage_code,  report_type and
 * report_id.  Set report_id to REPORT_ID_UNKNOWN if the rest of the fields
 * are unknown.  Otherwise use a usage_ref struct filled in from a previous
 * successful GUSAGE/SUSAGE call to save time.

  */
  usage_ref.report_type = HID_REPORT_TYPE_OUTPUT;
  usage_ref.report_id = 0;
  usage_ref.field_index = 0;
  usage_ref.usage_index = 0; /* which LED 0 is num lock, 1 is caps lock, 2 is scroll lock */
  usage_ref.usage_code = 27; /* no one cares? */
  usage_ref.value = 0; /* binary on (1)  or off (0) */
  ioctl(fd, HIDIOCSUSAGE, &usage_ref);

  rep_info.report_type = HID_REPORT_TYPE_OUTPUT;
  rep_info.report_id = 0;
  rep_info.num_fields = 1;
  ioctl(fd, HIDIOCSREPORT, &rep_info);
 
请问如何填写Byte0和Byte1这两个数据结构