Question

使用dmesg报告的设备为：

[ 7679.312788] hid-generic 0003:16D0:0E70.0012: hiddev0,hidraw0: USB HID v1.01 Device [.de.nonchip TinyStick HIDSTM1640] on usb-0000:00:13.0-3/input0

实际的HID描述符（如我将其放入设备的固件中，未进行嗅探和解码）如下：

PROGMEM const char usbHidReportDescriptor[USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH] = {    /* USB report descriptor */
    0x06, 0x00, 0xff,              // USAGE_PAGE (Generic Desktop)
    0x09, 0x01,                    // USAGE (Vendor Usage 1)
    0xa1, 0x01,                    // COLLECTION (Application)
    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
    0x26, 0xff, 0x00,              //   LOGICAL_MAXIMUM (255)
    0x75, 0x08,                    //   REPORT_SIZE (8)
    0x95, 0x08,                    //   REPORT_COUNT (8)
    0x09, 0x00,                    //   USAGE (Undefined)  
    0x82, 0x02, 0x01,              //   INPUT (Data,Var,Abs,Buf)
    0x95, 32, //   REPORT_COUNT (32)
    0x09, 0x00,                    //   USAGE (Undefined)        
    0xb2, 0x02, 0x01,              //   FEATURE (Data,Var,Abs,Buf)
    0xc0                           // END_COLLECTION
};

字符串描述符定义为：

#define USB_CFG_VENDOR_NAME     '.','d','e','.','n','o','n','c','h','i','p'
#define USB_CFG_VENDOR_NAME_LEN 11
#define USB_CFG_DEVICE_NAME     'T','i','n','y','S','t','i','c','k',' ','H','I','D','S','T','M','1','6','4','0'
#define USB_CFG_DEVICE_NAME_LEN 20

我在hidapi中使用以下代码来（尝试）找到它：

#define HIDSERIAL_VENDOR_ID 0x16d0
#define HIDSERIAL_PRODUCT_ID 0x0E70
#define HIDSERIAL_MANUFACTURER_STRING L".de.nonchip"
#define HIDSERIAL_PRODUCT_STRING L"TinyStick HIDSTM1640"

hid_device* hidserial_find_device(void){
  hid_device *handle = NULL;

  hid_init();
  // Enumerate and print the HID devices on the system
  struct hid_device_info *devs, *cur_dev;

  devs = hid_enumerate(HIDSERIAL_VENDOR_ID, HIDSERIAL_PRODUCT_ID);
  cur_dev = devs; 
  while (cur_dev) {
    wprintf(L"%ls %ls\n", cur_dev->manufacturer_string, cur_dev->product_string); // <------ DEBUG
    if( cur_dev->manufacturer_string!=NULL && cur_dev->product_string!=NULL &&
        0==wcscmp(HIDSERIAL_MANUFACTURER_STRING,cur_dev->manufacturer_string) &&
        0==wcscmp(HIDSERIAL_PRODUCT_STRING,cur_dev->product_string)){
      handle = hid_open_path(cur_dev->path);
      break;
    }
    cur_dev = cur_dev->next;
  }
  hid_free_enumeration(devs);

  return handle;
}

我的问题是，虽然由内核正确报告了该设备，却找不到该设备。调试输出显示一行(null) (null)，表示该设备已通过其VID：PID对枚举，但字符串突然间为空。我没有收到任何错误（可能会想到“权限被拒绝”之类的东西，但没有任何报告，甚至以root身份运行似乎也无济于事）...

Linux上的HIDAPI似乎无法识别描述符

0 个答案: