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USB

通用串行总线 (USB) 是一种行业标准，允许在各种类型的电子设备之间进行数据交换和供电。该标准支持多种运行速度，例如 1.5 Mbps 低速、12 Mbps 全速、480 Mbps 高速以及 5 Gbps 超高速和 10 Gbps 超高速 Plus。

RUBIK Pi 3 拥有 4 个 USB 口：

  • 两个 USB 3.0 A 口，只能作为主机模式使用，如下图 7。

  • 一个 USB 2.0 A 口，可以作为主机或设备模式使用，如下图 6。

  • 一个 USB 3.1 Gen 1 C 口，可以作为主机或设备模式（常用于 ADB），以及 DP 显示使用，如下图 5。

USB 接口功能验证​

魔方派 3 设备为符合 USB 视频类（UVC）标准的 USB 网络摄像头提供驱动程序支持。Linux 内核的 uvcvideo 驱动程序支持摄像头。有关 uvcvideo 驱动程序的更多信息，请参阅 https://www.kernel.org/doc/html/v4.19/media/v4l-drivers/uvcvideo.html。

uvcvideo 驱动程序将这类摄像头作为 V4L2 视频设备（可通过字符设备节点（如 /dev/videoX）进行访问）公开。

在用户空间中，应用程序可以使用 v4l2src GStreamer 插件管理 USB 摄像头，该插件与 Qualcomm 智能多媒体 SDK (QIM SDK) 捆绑在一起。此外，Yavta（又一个 V4L2 测试应用程序）等程序可以直接与 V4L2（Video4Linux2）接口交互，以测试和控制摄像头设备。

安装 Yavta

sudo apt install yavta

前提条件：获取图像格式大小

要通过 Yavta 或 GStreamer 配置 USB 摄像头，必须执行以下步骤。

  1. 要了解枚举详细信息，应插入 USB 摄像头并运行以下命令。
lsusb

随即显示以下输出。

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 1bcf:0215 Sunplus Innovation Technology Inc. 4K AutoFocus Webcam
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 0b95:1790 ASIX Electronics Corp. AX88179 Gigabit Ethernet
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  1. USB 摄像头插入前后，在魔方派 3 的终端，执行如下命令，根据两次结果的差异可以确定 USB 摄像头视频节点。
ls /dev/video*

示例输出：

root@rubikpi:/sys/bus/pci# ls /dev/video*
/dev/video0  /dev/video1  /dev/video32  /dev/video33
root@rubikpi:/sys/bus/pci# ls /dev/video*
/dev/video0  /dev/video1  /dev/video2  /dev/video3  /dev/video32  /dev/video33

如上所示，USB 摄像头的节点为 video2 和 video3。

  1. 要使用 Yavta 查看支持的输出格式和大小，应运行以下命令：
yavta /dev/video2 --enum-formats

随即显示以下输出。

Device /dev/video3 opened.
Device `4K AutoFocus Webcam: 4K AutoFoc' on `usb-0000:01:00.0-1' (driver 'uvcvideo') supports meta-d.
- Available formats:
        Format 0: UVCH (48435655)
        Type: Meta-data capture (13)
        Name: UVC Payload Header Metadata

Meta-data format: UVCH (48435655) buffer size 10240
ubuntu@rubikpi:~$ yavta /dev/video2 --enum-formats
Device /dev/video2 opened.
Device `4K AutoFocus Webcam: 4K AutoFoc' on `usb-0000:01:00.0-1' (driver 'uvcvideo') supports video,.
- Available formats:
        Format 0: MJPEG (47504a4d)
        Type: Video capture (1)
        Name: Motion-JPEG
        Frame size: 1920x1080 (1/30, 1/30)
        Frame size: 1280x720 (1/30)
        Frame size: 1600x900 (1/30)
        Frame size: 2304x1296 (1/30)
        Frame size: 2560x1440 (1/30)
        Frame size: 2688x1512 (1/30)
        Frame size: 3840x2160 (1/25)
        Frame size: 640x360 (1/30)
        Frame size: 800x450 (1/30)
        Frame size: 848x480 (1/30)
        Frame size: 960x540 (1/30)
        Frame size: 1024x576 (1/30)
        Frame size: 640x480 (1/30)
        Frame size: 800x600 (1/30)
        Frame size: 960x720 (1/30)
        Frame size: 1024x768 (1/30)
        Frame size: 1280x960 (1/30)
        Frame size: 1600x1200 (1/30)
        Frame size: 2048x1536 (1/30)
        Frame size: 2592x1944 (1/30)
        Frame size: 1920x1080 (1/30, 1/30)

        Format 1: YUYV (56595559)
        Type: Video capture (1)
        Name: YUYV 4:2:2
        Frame size: 1920x1080 (1/5, 1/5)
        Frame size: 1280x720 (1/10)
        Frame size: 1600x900 (1/5)
        Frame size: 640x360 (1/30)
        Frame size: 800x450 (1/20)
        Frame size: 848x480 (1/20)
        Frame size: 960x540 (1/20)
        Frame size: 1024x576 (1/15)
        Frame size: 640x480 (1/30)
        Frame size: 800x600 (1/20)
        Frame size: 960x720 (1/15)
        Frame size: 1024x768 (1/10)
        Frame size: 1280x960 (2/15)
        Frame size: 1600x1200 (1/5)
        Frame size: 1920x1080 (1/5, 1/5)

Video format: MJPEG (47504a4d) 1920x1080 (stride 0) field none buffer size 4147200
  1. 从第 3 步的显示结果中选择所需的图像格式和大小。

使用 Yavta 配置 USB 摄像头

前提条件：USB 摄像头输出格式和大小已确定。

请运行以下命令，以便选择 1920x1080 输出尺寸和 30 fps 的 MJPEG 格式，在 /tmp/ 下采集 10 帧，文件名为 testmjpeg-00000*.bin。

yavta -f MJPEG -s 1920x1080 -t 1/30 -c10 -F/tmp/testmjpeg /dev/video2

随即显示以下输出。

Device /dev/video2 opened.
Device `4K AutoFocus Webcam: 4K AutoFoc' on `usb-0000:01:00.0-1' (driver 'uvcvideo') supports video, capture, without mplanes.
Video format set: MJPEG (47504a4d) 1920x1080 (stride 0) field none buffer size 4147200
Video format: MJPEG (47504a4d) 1920x1080 (stride 0) field none buffer size 4147200
Current frame rate: 1/30
Setting frame rate to: 1/30
Frame rate set: 1/30
8 buffers requested.
length: 4147200 offset: 0 timestamp type/source: mono/SoE
Buffer 0/0 mapped at address 0xffffa5e5b000.
length: 4147200 offset: 32768 timestamp type/source: mono/SoE
Buffer 1/0 mapped at address 0xffffa5a66000.
length: 4147200 offset: 65536 timestamp type/source: mono/SoE
Buffer 2/0 mapped at address 0xffffa5671000.
length: 4147200 offset: 98304 timestamp type/source: mono/SoE
Buffer 3/0 mapped at address 0xffffa527c000.
length: 4147200 offset: 131072 timestamp type/source: mono/SoE
Buffer 4/0 mapped at address 0xffffa4e87000.
length: 4147200 offset: 163840 timestamp type/source: mono/SoE
Buffer 5/0 mapped at address 0xffffa4a92000.
length: 4147200 offset: 196608 timestamp type/source: mono/SoE
Buffer 6/0 mapped at address 0xffffa469d000.
length: 4147200 offset: 229376 timestamp type/source: mono/SoE
Buffer 7/0 mapped at address 0xffffa42a8000.
0 (0) [-] none 0 115283 B 53.095060 53.647782 244.260 fps ts mono/SoE
1 (1) [-] none 1 115277 B 53.647091 53.679768 1.811 fps ts mono/SoE
2 (2) [-] none 2 115376 B 53.683085 53.715810 27.782 fps ts mono/SoE
3 (3) [-] none 3 115545 B 53.715105 53.747738 31.230 fps ts mono/SoE
4 (4) [-] none 4 117998 B 53.747096 53.783769 31.259 fps ts mono/SoE
5 (5) [-] none 5 117962 B 53.783089 53.815715 27.783 fps ts mono/SoE
6 (6) [-] none 6 118127 B 53.815088 53.847740 31.251 fps ts mono/SoE
7 (7) [-] none 7 118027 B 53.847099 53.883764 31.239 fps ts mono/SoE
8 (0) [-] none 8 119080 B 53.883084 53.915721 27.789 fps ts mono/SoE
9 (1) [-] none 9 119399 B 53.915093 53.947736 31.241 fps ts mono/SoE
Captured 10 frames in 0.856770 seconds (11.671741 fps, 1368014.420968 B/s).
8 buffers released.

请运行以下命令，以便选择 1280x960 输出尺寸、15 fps 的 YUV 格式，在 /tmp/ 下采集 10 帧，生成的文件名为 testyuv-00000*.bin。

yavta -f YUYV -s 1280x720 -t 1/15 -c10 -F/tmp/testyuv /dev/video2

随即显示以下输出。

Device /dev/video2 opened.
Device `4K AutoFocus Webcam: 4K AutoFoc' on `usb-0000:01:00.0-1' (driver 'uvcvideo') supports video,.
Video format set: YUYV (56595559) 1280x720 (stride 2560) field none buffer size 1843200
Video format: YUYV (56595559) 1280x720 (stride 2560) field none buffer size 1843200
Current frame rate: 1/10
Setting frame rate to: 1/15
Frame rate set: 1/10
8 buffers requested.
length: 1843200 offset: 0 timestamp type/source: mono/SoE
Buffer 0/0 mapped at address 0xffff966ce000.
length: 1843200 offset: 32768 timestamp type/source: mono/SoE
Buffer 1/0 mapped at address 0xffff9650c000.
length: 1843200 offset: 65536 timestamp type/source: mono/SoE
Buffer 2/0 mapped at address 0xffff9634a000.
length: 1843200 offset: 98304 timestamp type/source: mono/SoE
Buffer 3/0 mapped at address 0xffff96188000.
length: 1843200 offset: 131072 timestamp type/source: mono/SoE
Buffer 4/0 mapped at address 0xffff95fc6000.
length: 1843200 offset: 163840 timestamp type/source: mono/SoE
Buffer 5/0 mapped at address 0xffff95e04000.
length: 1843200 offset: 196608 timestamp type/source: mono/SoE
Buffer 6/0 mapped at address 0xffff95c42000.
length: 1843200 offset: 229376 timestamp type/source: mono/SoE
Buffer 7/0 mapped at address 0xffff95a80000.
0 (0) [-] none 0 1843200 B 364.737849 364.966754 2.174 fps ts mono/SoE
1 (1) [-] none 1 1843200 B 364.966042 365.066785 4.382 fps ts mono/SoE
2 (2) [-] none 2 1843200 B 365.066087 365.166812 9.996 fps ts mono/SoE
3 (3) [-] none 3 1843200 B 365.166149 365.266862 9.994 fps ts mono/SoE
4 (4) [-] none 4 1843200 B 365.266205 365.366929 9.994 fps ts mono/SoE
5 (5) [-] none 5 1843200 B 365.366266 365.466985 9.994 fps ts mono/SoE
6 (6) [-] none 6 1843200 B 365.466326 365.567108 9.994 fps ts mono/SoE
7 (7) [-] none 7 1843200 B 365.566381 365.667099 9.995 fps ts mono/SoE
8 (0) [-] none 8 1843200 B 365.666440 365.767150 9.994 fps ts mono/SoE
9 (1) [-] none 9 1843200 B 365.766496 365.867212 9.994 fps ts mono/SoE
Captured 10 frames in 1.589346 seconds (6.291895 fps, 11597220.863435 B/s).
8 buffers released.

使用 Qualcomm IM SDK 中的 GStreamer 配置 USB 摄像头

Qualcomm IM SDK 采用开源多媒体框架 GStreamer 公开了多媒体和机器学习这两个领域简洁的 API 和易用的插件。有关安装 Qualcomm IM SDK 的信息，请参阅 快速开始 部分。

Qualcomm IM SDK 包含 v4l2src 插件，该插件允许以选定的格式从 USB 摄像头进行输入。waylandsink 插件负责在 Wayland 显示界面上渲染视频输出。

前提条件：USB 摄像头输出格式和大小已确定。

  1. 要设置 Wayland 显示界面的环境变量，在魔方派 3 终端中运行以下命令。
export XDG_RUNTIME_DIR=/dev/socket/weston && export WAYLAND_DISPLAY=wayland-1

2.使用 GStreamer 命令将摄像头拍摄的视频流传输到 UI。确保已设置合适的设备 ID (/dev/videoX)，并根据检测到的 USB 摄像头选择正确的格式。

备注

在 GStreamer 中，YUYV 颜色格式被称为 YUY2。因此，您必须在设置管道时指定 YUYV 格式并在 caps 过滤器中使用 YUY2。

  • 对于 720p，运行以下命令：
gst-launch-1.0 -e v4l2src io-mode=dmabuf-import device="/dev/video0" ! video/x-raw,format=YUY2,width=1280,height=720,framerate=10/1 ! waylandsink fullscreen=true

随即显示以下输出。

Y2,width=1280,height=720,framerate=10/1 ! waylandsink fullscreen=true
Setting pipeline to PAUSED ...
I/Adreno-UNKNOWN (1985,1985): <ReadGpuID:357>: Reading chip ID through GSL
GBM_INFO::msmgbm_mapper(262)::gbm mapper instantiated
gbm_create_device(224): Info: backend name is: msm_drm
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
gbm_create_device(224): Info: backend name is: msm_drm
GBM_ERR::msmgbm_bo_create(870)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for data fd errono: 22 (Invalid argument) drm fd: 24 data fd: 26
 GBM_ERR::msmgbm_bo_create(923)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for metadata fd errono: 22 (Invalid argument) drm fd: 24 metadata fd: 27
GBM_ERR::msmgbm_bo_create(870)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for data fd errono: 22 (Invalid argument) drm fd: 24 data fd: 29
GBM_ERR::msmgbm_bo_create(923)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for metadata fd errono: 22 (Invalid argument) drm fd: 24 metadata fd: 30
GBM_ERR::msmgbm_bo_create(870)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for data fd errono: 22 (Invalid argument) drm fd: 24 data fd: 32
GBM_ERR::msmgbm_bo_create(923)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for metadata fd errono: 22 (Invalid argument) drm fd: 24 metadata fd: 33
GBM_ERR::msmgbm_bo_create(870)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for data fd errono: 22 (Invalid argument) drm fd: 24 data fd: 35
GBM_ERR::msmgbm_bo_create(923)::DRM_IOCTL_PRIME_FD_TO_HANDLE failed for metadata fd errono: 22 (Invalid argument) drm fd: 24 metadata fd: 36
Redistribute latency...
0:00:47.7 / 99:99:99.
  • 对于 1080p，运行以下命令：
gst-launch-1.0 -e v4l2src io-mode=dmabuf-import device="/dev/video0" ! video/x-raw,format=YUY2,width=1920,height=1080,framerate=5/1 ! waylandsink fullscreen=true

USB 调试​

本节提供有关获取调试日志的各种方法的信息。调试方式有 regdumps 、调试 ftraces 、 configfs 节点等。在调试与进入/退出低功耗模式、SMMU 故障、无时钟访问相关的问题时，可通过上述日志查看事件和控制器状态的详细信息。

备注

下面命令需切换到 root 用户：

执行 sudo passwd root 命令根据提示修改 root 帐号密码，使用 su root 命令切换到 root 用户。

  • USB 2.0 Type-A 设备路径： /sys/devices/platform/soc@0/8c00000.usb/xhci-hcd.1.auto/usb3/

  • USB 3.0 Type-A 设备路径：

    • /sys/devices/platform/soc@0/1c00000.pci/pci0000:00/0000:00:00.0/0000:01:00.0/usb1

    • /sys/devices/platform/soc@0/1c00000.pci/pci0000:00/0000:00:00.0/0000:01:00.0/usb2

  • USB 3.1 Type-C 设备路径：/sys/devices/platform/soc@0/a600000.usb

USB 跟踪​

使用 debugfs 跟踪可以更加深入地了解 USB 线上发生的每一个事务。如需查看跟踪列表，可运行以下命令。

注意

确保已挂载 debugfs。如果尚未挂载，可运行以下命令来挂载 debugfs:

mount -t debugfs none /sys/kernel/debug

ls /sys/kernel/debug/tracing/events/dwc3

以下是可用于验证 xHCI/gadget 协议栈/USB Type-C 连接器系统软件接口 (UCSI) 中的数据传输的跟踪。

dwc3_alloc_request  dwc3_event              dwc3_gadget_generic_cmd  enable
dwc3_complete_trb   dwc3_free_request       dwc3_gadget_giveback     filter
dwc3_ctrl_req       dwc3_gadget_ep_cmd      dwc3_prepare_trb
dwc3_ep_dequeue     dwc3_gadget_ep_disable  dwc3_readl
dwc3_ep_queue       dwc3_gadget_ep_enable   dwc3_writel

要列出 xHCI/主机控制器驱动程序 (HCD) 中的跟踪数据，请运行以下命令。

ls /sys/kernel/debug/tracing/events/xhci-hcd

以下是可用于验证 xHCI/HCD 中数据传输的跟踪。

enable                            xhci_handle_cmd_config_ep
filter                            xhci_handle_cmd_disable_slot
  xhci_add_endpoint                 xhci_handle_cmd_reset_dev
  xhci_address_ctrl_ctx             xhci_handle_cmd_reset_ep
  xhci_address_ctx                  xhci_handle_cmd_set_deq
  xhci_alloc_dev                    xhci_handle_cmd_set_deq_ep
  xhci_alloc_virt_device            xhci_handle_cmd_stop_ep
  xhci_configure_endpoint           xhci_handle_command
  xhci_configure_endpoint_ctrl_ctx  xhci_handle_event
  xhci_dbc_alloc_request            xhci_handle_port_status
  xhci_dbc_free_request             xhci_handle_transfer
  xhci_dbc_gadget_ep_queue          xhci_hub_status_data
  xhci_dbc_giveback_request         xhci_inc_deq
  xhci_dbc_handle_event             xhci_inc_enq
  xhci_dbc_handle_transfer          xhci_queue_trb
  xhci_dbc_queue_request            xhci_ring_alloc
  xhci_dbg_address                  xhci_ring_ep_doorbell
  xhci_dbg_cancel_urb               xhci_ring_expansion
  xhci_dbg_context_change           xhci_ring_free
  xhci_dbg_init                     xhci_ring_host_doorbell
  xhci_dbg_quirks                   xhci_setup_addressable_virt_device
  xhci_dbg_reset_ep                 xhci_setup_device
  xhci_dbg_ring_expansion           xhci_setup_device_slot
  xhci_discover_or_reset_device     xhci_stop_device
  xhci_free_dev                     xhci_urb_dequeue
  xhci_free_virt_device             xhci_urb_enqueue
  xhci_get_port_status              xhci_urb_giveback
  xhci_handle_cmd_addr_dev

请运行以下命令，以便列出 USB 视频类 (UVC) gadget 驱动程序的可用事件。

ls /sys/kernel/debug/tracing/events/gadget

随即显示以下输出。

enable                      usb_gadget_activate
  filter                      usb_gadget_clear_selfpowered
  usb_ep_alloc_request        usb_gadget_connect
  usb_ep_clear_halt           usb_gadget_deactivate
  usb_ep_dequeue              usb_gadget_disconnect
  usb_ep_disable              usb_gadget_frame_number
  usb_ep_enable               usb_gadget_giveback_request
  usb_ep_fifo_flush           usb_gadget_set_remote_wakeup
  usb_ep_fifo_status          usb_gadget_set_selfpowered
  usb_ep_free_request         usb_gadget_vbus_connect
  usb_ep_queue                usb_gadget_vbus_disconnect
  usb_ep_set_halt             usb_gadget_vbus_draw
  usb_ep_set_maxpacket_limit  usb_gadget_wakeup
  usb_ep_set_wedge

如需列出 UCSI 驱动程序中的可用事件，可运行以下命令。

ls /sys/kernel/debug/tracing/events/ucsi

随即显示以下输出。

enable  ucsi_connector_change  ucsi_register_port  ucsi_run_command
filter  ucsi_register_altmode  ucsi_reset_ppm

USB 寄存器打印​

USB debugfs 提供以下信息，下面以 Type-C 接口为例。

  • 工作模式

    cat /sys/kernel/debug/usb/a600000.usb/mode # Type-C 接口
    备注

    USB 2.0 Type-A 的工作模式cat /sys/kernel/debug/usb/8c00000.usb/qcom_usb2_0_mode

    示例输出：

    device

  • 设备模式下所有端点的状态和传输环形缓冲区 (TRB) 队列。

  • 当前链路状态。

    cat /sys/kernel/debug/usb/a600000.usb/link_state

    示例输出 

    Sleep

  • 列出处理器 (LSP) dump。

    cat /sys/kernel/debug/usb/a600000.usb/lsp_dump

    示例输出：

    GDBGLSP[0] = 0x40000000
    GDBGLSP[1] = 0x00003a80
    GDBGLSP[2] = 0x38200000
    GDBGLSP[3] = 0x00802000
    GDBGLSP[4] = 0x126f1000
    GDBGLSP[5] = 0x3a800018
    GDBGLSP[6] = 0x00000a80
    GDBGLSP[7] = 0xfc03f14a
    GDBGLSP[8] = 0x0b803fff
    GDBGLSP[9] = 0x00000000
    GDBGLSP[10] = 0x000000f8
    GDBGLSP[11] = 0x000000f8
    GDBGLSP[12] = 0x000000f8
    GDBGLSP[13] = 0x000000f8
    GDBGLSP[14] = 0x000000f8
    GDBGLSP[15] = 0x000000f8
ls /sys/kernel/debug/usb/a600000.usb

示例输出：

ep0in    ep11out  ep14in   ep1out  ep4in   ep6out  ep9in       regdump
ep0out   ep12in   ep14out  ep2in   ep4out  ep7in   ep9out      testmode
ep10in   ep12out  ep15in   ep2out  ep5in   ep7out  link_state
ep10out  ep13in   ep15out  ep3in   ep5out  ep8in   lsp_dump
ep11in   ep13out  ep1in    ep3out  ep6in   ep8out  mode

regdump 命令提供以下寄存器的寄存器空间的当前状态：

  • 设备模式的寄存器，例如 DCTL、DSTS 和 DCFG

  • 全局寄存器，例如 GCTL 和 GSTS

cd /sys/kernel/debug/usb/a600000.usb
cat regdump

示例输出：

GSBUSCFG0 = 0x2222000e
GSBUSCFG1 = 0x00001700
GTXTHRCFG = 0x00000000
GRXTHRCFG = 0x00000000
GCTL = 0x00102000
GEVTEN = 0x00000000
GSTS = 0x7e800000
GUCTL1 = 0x810c1802
GSNPSID = 0x5533330a
GGPIO = 0x00000000
GUID = 0x00060500
GUCTL = 0x0d00c010
GBUSERRADDR0 = 0x00000000
GBUSERRADDR1 = 0x00000000
GPRTBIMAP0 = 0x00000000
GPRTBIMAP1 = 0x00000000
GHWPARAMS0 = 0x4020400a
GDBGFIFOSPACE = 0x00420000
GDBGLTSSM = 0x41090658
GDBGBMU = 0x20300000
GPRTBIMAP_HS0 = 0x00000000
GPRTBIMAP_HS1 = 0x00000000
GPRTBIMAP_FS0 = 0x00000000
GPRTBIMAP_FS1 = 0x00000000
GUCTL2 = 0x0198440d
VER_NUMBER = 0x00000000
VER_TYPE = 0x00000000
GUSB2PHYCFG(0) = 0x00002400
GUSB2I2CCTL(0) = 0x00000000
GUSB2PHYACC(0) = 0x00000000
GUSB3PIPECTL(0) = 0x030e0002
GTXFIFOSIZ(0) = 0x00000042
GRXFIFOSIZ(0) = 0x00000305
GEVNTADRLO(0) = 0xfffff000
GEVNTADRHI(0) = 0x0000000f
GEVNTSIZ(0) = 0x00001000
GEVNTCOUNT(0) = 0x00000000
GHWPARAMS8 = 0x000007ea
GUCTL3 = 0x00010000
GFLADJ = 0x8c80c8a0
DCFG = 0x00cc08b4
DCTL = 0x8cf00a00
DEVTEN = 0x00000257
DSTS = 0x008a5200
DGCMDPAR = 0x00000000
DGCMD = 0x00000000
DALEPENA = 0x0000000f
DEPCMDPAR2(0) = 0x00000000
DEPCMDPAR1(0) = 0xffffe000
DEPCMDPAR0(0) = 0x0000000f
DEPCMD(0) = 0x00000006
OCFG = 0x00000000
OCTL = 0x00000000
OEVT = 0x00000000
OEVTEN = 0x00000000
OSTS = 0x00000000

主机 sysfs 查询​

要查看总线详细信息，请运行以下命令。

lsusb

示例输出：

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 03f0:134a HP, Inc Optical Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

请运行以下命令，以便列出当前目录的内容。

cd /sys/bus/usb/devices/
ls

示例输出：

1-0:1.0  1-1  1-1:1.0  2-0:1.0  usb1  usb2

要查看有关 USB 设备的详细信息，请运行以下命令。

cat /sys/kernel/debug/usb/devices

示例输出：

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 6.05
S:  Manufacturer=Linux 6.5.0-rc4 xhci-hcd
S:  Product=xHCI Host Controller
S:  SerialNumber=xhci-hcd.0.auto
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=1.5  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=03f0 ProdID=134a Rev= 1.00
S:  Manufacturer=PixArt
S:  Product=HP USB Optical Mouse
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=02 Driver=usbhid
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=10ms

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=5000 MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 3.00 Cls=09(hub  ) Sub=00 Prot=03 MxPS= 9 #Cfgs=  1
P:  Vendor=1d6b ProdID=0003 Rev= 6.05
S:  Manufacturer=Linux 6.5.0-rc4 xhci-hcd
S:  Product=xHCI Host Controller
S:  SerialNumber=xhci-hcd.0.auto
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms