我试图从Wacom Inkling
中提取实时数据Roel Janssen已经检查了数据包here：
// Some kind of handshaking.
// Values obtained by sniffing the USB connection between SketchManager and the device.
unsigned char usb_data[33];
memset (&usb_data, '\0', 33);
int bytes = 0;
memcpy (&usb_data, "\x80\x01\x03\x01\x02\x00\x00\x00", 8);
bytes += libusb_control_transfer (handle,
0x21, // bmRequestType
9, // bRequest
0x0380, // wValue
0, // wIndex
usb_data, // data
33, // wLength
0); // timeout
memcpy (&usb_data, "\x80\x01\x0a\x01\x01\x0b\x01\x00", 8);
bytes += libusb_control_transfer (handle, 0x21, 9, 0x0380, 0, usb_data, 33, 0);
memset (&usb_data, '\0', 33);
bytes += libusb_control_transfer (handle, 0xa1, 1, 0x0380, 0, usb_data, 33, 0);
memcpy (&usb_data, "\x80\x01\x0b\x01\x00\x00\x00\x00", 8);
bytes += libusb_control_transfer (handle, 0x21, 9, 0x0380, 0, usb_data, 33, 0);
memcpy (&usb_data, "\x80\x01\x02\x01\x01\x00\x00\x00", 8);
bytes += libusb_control_transfer (handle, 0x21, 9, 0x0380, 0, usb_data, 33, 0);
memcpy (&usb_data, "\x80\x01\x0a\x01\x01\x02\x01\x00", 8);
bytes += libusb_control_transfer (handle, 0x21, 9, 0x0380, 0, usb_data, 33, 0);
memset (&usb_data, '\0', 33);
bytes += libusb_control_transfer (handle, 0xa1, 1, 0x0380, 0, usb_data, 33, 0);
我尝试使用HID API重写此代码，here具有非常小的API（feature report）
我现在要尝试使用hid_write，但这次握手可能会发送{{3}} ......？
是否有人可以查看该字节流并查看发生了什么？
编辑：看来Inkling公开了一个FlashDrive和HID接口，所以我猜这个字节码必须选择HID接口并告诉它开始发送数据。但我可以用更优雅/人类可读的形式对其进行编码吗？ 编辑：我有它的工作！hid_write和hid_send_feature_report都有效！
hid_device* handle = hid_open(inklingVendorId, inklingProductId, NULL);
jassert(handle != nullptr);
int bytes_written =
hid_send_feature_report(handle, (const unsigned char *)"\x80\x01\x03\x01\x02\x00\x00\x00", 8) +
hid_send_feature_report(handle, (const unsigned char *)"\x80\x01\x0a\x01\x01\x0b\x01\x00", 8) +
hid_send_feature_report(handle, (const unsigned char *)"\x80\x01\x0b\x01\x00\x00\x00\x00", 8) +
hid_send_feature_report(handle, (const unsigned char *)"\x80\x01\x02\x01\x01\x00\x00\x00", 8) +
hid_send_feature_report(handle, (const unsigned char *)"\x80\x01\x0a\x01\x01\x02\x01\x00", 8);
jassert(bytes_written == 5*8);
const int enable_nonblocking = 1, disable_nonblocking = 0;
jassert( hid_set_nonblocking(handle, disable_nonblocking) != FAIL); // want to block
while(true) {
int bytes_got = hid_read(handle, usb_data, 10);
......但是我仍然想了解发生了什么。这很苛刻。
编辑：lsusb的输出（来自Roel，我没有Linux可用）：
Bus 003 Device 002: ID 056a:0221 Wacom Co., Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x056a Wacom Co., Ltd
idProduct 0x0221
bcdDevice 12.56
iManufacturer 1 (error)
iProduct 2 MSC Device
iSerial 5 4833000045C5549C0002DD012DA5549C
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 57
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 3 USB/MSC Inkling
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 2 Mouse
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.01
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 215
Report Descriptor: (length is 215)
Item(Global): Usage Page, data= [ 0x0d ] 13
Digitizer
Item(Local ): Usage, data= [ 0x02 ] 2
Pen
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x02 ] 2
Item(Local ): Usage, data= [ 0x02 ] 2
Pen
Item(Main ): Collection, data= [ 0x00 ] 0
Physical
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x30 ] 48
Direction-X
Item(Local ): Usage, data= [ 0x31 ] 49
Direction-Y
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x80 0x07 ] 1920
Item(Global): Physical Minimum, data= [ 0x00 ] 0
Item(Global): Physical Maximum, data= [ 0x00 0x78 ] 30720
Item(Global): Unit, data= [ 0x11 ] 17
System: SI Linear, Unit: Centimeter
Item(Global): Unit Exponent, data= [ 0x0e ] 14
Unit Exponent: 14
Item(Global): Report Size, data= [ 0x10 ] 16
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Global): Usage Page, data= [ 0x0d ] 13
Digitizer
Item(Local ): Usage, data= [ 0x42 ] 66
Tip Switch
Item(Local ): Usage, data= [ 0x45 ] 69
Eraser
Item(Local ): Usage, data= [ 0x44 ] 68
Barrel Switch
Item(Local ): Usage, data= [ 0x32 ] 50
In Range
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x04 ] 4
Item(Global): Unit, data= [ 0x00 ] 0
System: None, Unit: (None)
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Global): Usage Page, data= [ 0x09 ] 9
Buttons
Item(Local ): Usage Minimum, data= [ 0x01 ] 1
Button 1 (Primary)
Item(Local ): Usage Maximum, data= [ 0x04 ] 4
Button 4
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x04 ] 4
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Global): Usage Page, data= [ 0x0d ] 13
Digitizer
Item(Local ): Usage, data= [ 0x30 ] 48
Tip Pressure
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0x04 ] 1024
Item(Global): Report Size, data= [ 0x10 ] 16
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Global): Usage Page, data= [ 0x0d ] 13
Digitizer
Item(Local ): Usage, data= [ 0x3d ] 61
X Tilt
Item(Local ): Usage, data= [ 0x3e ] 62
Y Tilt
Item(Global): Logical Minimum, data= [ 0x81 ] 129
Item(Global): Logical Maximum, data= [ 0x7f ] 127
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x00 ] 0
Undefined
Item(Global): Report ID, data= [ 0x04 ] 4
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x0c ] 12
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x00 ] 0
Undefined
Item(Global): Report ID, data= [ 0x08 ] 8
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x3b ] 59
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x01 ] 1
Pointer
Item(Global): Report ID, data= [ 0x80 ] 128
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x20 ] 32
Item(Main ): Feature, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x02 ] 2
Mouse
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Report ID, data= [ 0x01 ] 1
Item(Local ): Usage, data= [ 0x01 ] 1
Pointer
Item(Main ): Collection, data= [ 0x00 ] 0
Physical
Item(Global): Usage Page, data= [ 0x01 ] 1
Generic Desktop Controls
Item(Local ): Usage, data= [ 0x30 ] 48
Direction-X
Item(Local ): Usage, data= [ 0x31 ] 49
Direction-Y
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x80 0x07 ] 1920
Item(Global): Physical Minimum, data= [ 0x00 ] 0
Item(Global): Physical Maximum, data= [ 0x00 0x78 ] 30720
Item(Global): Unit, data= [ 0x11 ] 17
System: SI Linear, Unit: Centimeter
Item(Global): Unit Exponent, data= [ 0x0e ] 14
Unit Exponent: 14
Item(Global): Report Size, data= [ 0x10 ] 16
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Global): Usage Page, data= [ 0x09 ] 9
Buttons
Item(Local ): Usage Minimum, data= [ 0x01 ] 1
Button 1 (Primary)
Item(Local ): Usage Maximum, data= [ 0x03 ] 3
Button 3 (Tertiary)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x03 ] 3
Item(Global): Unit, data= [ 0x00 ] 0
System: None, Unit: (None)
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Global): Report Count, data= [ 0x05 ] 5
Item(Main ): Input, data= [ 0x01 ] 1
Constant Array Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Item(Main ): End Collection, data=none
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 4 USB/MSC Inkling
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 2
Device Status: 0x0000
(Bus Powered)
答案 0 :(得分：2)
1）验证Inkling是否使用HID USB设备类。尝试lsusb -v并检查输出中的bDeviceClass或bInterfaceClass字段（ USB人机接口设备类可用于描述设备和接口类。使用接口类当USB设备可以包含多个功能时。来自https://en.wikipedia.org/wiki/USB_human_interface_device_class）在手册（https://www.wacom.com/~/media/files/store-manuals/inkling-manual-english.pdf）中说它是USB闪存驱动器，在这种情况下它使用USB大容量存储设备类（BULK传输）
2）如果是USB HID设备类，您可以尝试获取与此网站http://libusb.6.n5.nabble.com/How-to-get-HID-report-td4628.html
类似的功能报告（如果墨水发送任何内容） libusb_get_descriptor 制作标准的 GET_DESCRIPTOR 请求，其中
bmRequestType 字段 0x80。 DT_REPORT 描述符请求必须
表示收件人是一个界面，需要
bmRequestType 为 0x81。
你有两个不错的选择。报告描述符都包含在中 配置描述符，所以你应该能够获取整个 配置描述符集成并解析它以提取报告 描述符。
或者， libusb_get_descriptor 是一个非常薄的层
libusb_control_transfer ，因此您可以手动展开它：
res = libusb_control_transfer( devh, LIBUSB_ENDPOINT_IN |
LIBUSB_RECIPIENT_INTERFACE,
LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_REPORT << 8) | 0, 0, buf,
sizeof(buf), 1000);
更多链接： - http://eleccelerator.com/tutorial-about-usb-hid-report-descriptors/ http://www.beyondlogic.org/usbnutshell/usb1.shtml
---------------------------------------------------------------------------------
libusb_control_transfer执行 USB控制传输。 控制转移用于命令和状态操作，请参阅此http://libusb.sourceforge.net/api-1.0/group__syncio.html和此http://www.beyondlogic.org/usbnutshell/usb4.shtml#Control
USB控制请求是 USB请求的子类型，请参阅 http://www.beyondlogic.org/usbnutshell/usb6.shtml
usb_data似乎是USB发送缓冲区，它总是填充数据字节，然后libusb_control_transfer发送
这是USB控制请求的评论形式（ http://www.beyondlogic.org/usbnutshell/usb6.shtml ）
memcpy (&usb_data, "\x80\x01\x03\x01\x02\x00\x00\x00", 8);
bytes += libusb_control_transfer (handle,
0x21, // bmRequestType
9, // bRequest
0x0380, // wValue
0, // wIndex
usb_data, // data
33, // wLength
0); // timeout
这是USB控制请求的简短形式
memcpy (&usb_data, "\x80\x01\x0a\x01\x01\x0b\x01\x00", 8);
bytes += libusb_control_transfer (handle, 0x21, 9, 0x0380, 0, usb_data, 33, 0);
所以像"\x80\x01\x03\x01\x02\x00\x00\x00"这样的所有字节序列都是用于配置Inkling的命令代码（＆＃39;握手＆＃39;），只有Inkling和Wacom的人才能理解......
答案 1 :(得分：1)
所以这是您通过USB发送的一份报告：
80 01 03 01 02 00 00 00 .... (in total the buffer is 1+32 = 33 bytes)
^^ Report ID
这是HID描述符的相关部分：
...
Item(Global): Report ID, data= [ 0x80 ] 128
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x20 ] 32
Item(Main ): Feature, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
这表示报告ID 0x80的数据必须被解释为一个字节的32倍（它的意思取决于我猜的驱动程序）。这是一项功能，这意味着它可以通过控制端点上的GET_FEATURE / SET_FEATURE报告配置设备。
有关如何解释此描述符的更多信息，请参阅http://www.usb.org/developers/hidpage/中的HID v1.1规范。