请求USB设备描述符失败 (代码 43)CM_PROB_FAILED_POST_START

今天一个USB摄像头又出现了如下的问题：

在设备管理器中显示如下：

我们通过UsbTreeViewer查看其信息如下：

由于该设备有问题，Windows 已将其停止。 (代码 43)
请求USB设备描述符失败。

而USBTreeViewer中的信息如下：

    =========================== USB Port4 ===========================

Connection Status        : 0x02 (Device failed enumeration)
Port Chain               : 2-2-4

Device Manager Problem   : 43 (CM_PROB_FAILED_POST_START)
Used Endpoints           : 0

      ======================== USB Device ========================

        +++++++++++++++++ Device Information ++++++++++++++++++
Device Description       : 未知 USB 设备(设备描述符请求失败)
Device ID                : USB\VID_0000&PID_0002\7&207D0786&2&4
Hardware IDs             : USB\DEVICE_DESCRIPTOR_FAILURE
Driver KeyName           : {36fc9e60-c465-11cf-8056-444553540000}\0011 (GUID_DEVCLASS_USB)
Driver Inf               : C:\WINDOWS\inf\usb.inf
Legacy BusType           : PNPBus
Class                    : USB
Class GUID               : {36fc9e60-c465-11cf-8056-444553540000} (GUID_DEVCLASS_USB)
Enumerator               : USB
PDO                      : \Device\USBPDO-4
Location Info            : Port_#0004.Hub_#0004
Manufacturer Info        : (标准 USB 主控制器)
Capabilities             : 0x64 (Removable, SilentInstall, RawDeviceOK)
Status                   : 0x01806400 (DN_HAS_PROBLEM, DN_DISABLEABLE, DN_REMOVABLE, DN_NT_ENUMERATOR, DN_NT_DRIVER)
Problem Code             : 43 (CM_PROB_FAILED_POST_START)
Address                  : 4
HcDisableSelectiveSuspend: 0
EnableSelectiveSuspend   : 0
SelectiveSuspendEnabled  : 0
EnhancedPowerMgmtEnabled : 0
IdleInWorkingState       : 0
WakeFromSleepState       : 0
Power State              : D3 (supported: D0, D2, D3, wake from D0, wake from D2)

        ---------------- Connection Information ---------------
Connection Index         : 0x04 (Port 4)
Connection Status        : 0x02 (DeviceFailedEnumeration)
Current Config Value     : 0x00 (Configuration 0)
Device Address           : 0x00 (0)
Is Hub                   : 0x00 (no)
Device Bus Speed         : 0x00 (Low-Speed)
Number Of Open Pipes     : 0x00 (0 pipes to data endpoints)
Data (HexDump)           : 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
                           00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02   ................
                           00 00 00                                          ...

        --------------- Connection Information V2 -------------
Connection Index         : 0x04 (4)
Length                   : 0x10 (16 bytes)
SupportedUsbProtocols    : 0x03
 Usb110                  : 1 (yes, port supports USB 1.1)
 Usb200                  : 1 (yes, port supports USB 2.0)
 Usb300                  : 0 (no, port not supports USB 3.0)
 ReservedMBZ             : 0x00
Flags                    : 0x00
 DevIsOpAtSsOrHigher     : 0 (Device is not operating at SuperSpeed or higher)
 DevIsSsCapOrHigher      : 0 (Device is not SuperSpeed capable or higher)
 DevIsOpAtSsPlusOrHigher : 0 (Device is not operating at SuperSpeedPlus or higher)
 DevIsSsPlusCapOrHigher  : 0 (Device is not SuperSpeedPlus capable or higher)
 ReservedMBZ             : 0x00
Data (HexDump)           : 04 00 00 00 10 00 00 00 03 00 00 00 00 00 00 00   ................

    ---------------------- Device Descriptor ----------------------
bLength                  : 0x00 (0 bytes)

      -------------------- String Descriptors -------------------
String descriptors are not available  (because the device has problem code CM_PROB_FAILED_POST_START)

这是一起典型的USB枚举过程中获取USB设备描述符失败的问题。当然这个自己现象一般情况下我们是遇不到的，不过这大概率是固件没有回应主机发送的获取USB设备描述符请求而导致的。

当然，本人以前也做过一个实验，通过STM32F407做了一个HID设备，但是对获取USB设备描述符不回应，主机不停地重试，最终超时失败。详细过程我也通过USB Packet Viewer抓包，有兴趣的可详见：https://www.bilibili.com/video/BV1L34y1J7Qt/

本站相关的其它文章详见：

• Windows10设备管理器USB设备描述符请求失败（未知的usb设备） https://www.usbzh.com/article/detail-395.html
• Windows下USB堆栈如何枚举USB设备 https://www.usbzh.com/article/detail-626.html