Documentation Index
Fetch the complete documentation index at: /llms.txt
Use this file to discover all available pages before exploring further.
| 控制器 | 地址 | 最高速率 |
|---|---|---|
| USB0 | 0xa600000 | USB 3.x SuperSpeed |
| USB1 | 0xa400000 | USB 2.0 High Speed |
| 特性 | 说明 |
|---|---|
| 双角色设备(DRD) | 主机和设备模式,支持动态角色检测 |
| USB 3.1 Gen1 | USB0 和 USB1 上的 SuperSpeed 5 Gbps |
| USB 2.0 High Speed | 所有控制器上均为 480 Mbps |
| xHCI | 符合可扩展主机控制器接口规范 |
| 传输类型 | 控制、批量、中断、同步 |
echo auto > /sys/bus/platform/devices/a600000.usb/power/control
echo 2000 > /sys/bus/platform/devices/a600000.usb/power/autosuspend_delay_ms
cat /sys/bus/platform/devices/a600000.usb/power/runtime_status
echo on > /sys/bus/platform/devices/a600000.usb/power/control
# Perform composition switch
echo auto > /sys/bus/platform/devices/a600000.usb/power/control
uvcvideo 内核驱动支持符合 USB 视频类(UVC)标准的 USB 摄像头,设备以 /dev/videoX 的形式暴露。
检测摄像头
lsusb
v4l2-ctl --list-devices
ls -l /dev/v4l/by-id/
检查支持的格式
yavta /dev/video2 --enum-formats
视频流传输
yavta -f MJPEG -s 1280x720 -t 1/30 -c10 -F/home/ubuntu/test.jpeg /dev/video2
export XDG_RUNTIME_DIR=/dev/socket/weston
export WAYLAND_DISPLAY=wayland-1
gst-launch-1.0 -e v4l2src device=/dev/video2 ! \
video/x-raw,format=YUY2,width=1280,height=720,framerate=30/1 ! \
videoconvert ! waylandsink fullscreen=true
lsusb # List connected USB devices
cat /sys/kernel/debug/usb/devices # Detailed device info
cat /sys/kernel/debug/usb/a600000.usb/mode # Check USB mode
cat /sys/kernel/debug/usb/a600000.usb/link_state # Check link state
mount -t debugfs none /sys/kernel/debug
echo 1 > /sys/kernel/debug/tracing/events/dwc3/enable
echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable
cat /sys/kernel/debug/tracing/trace
USB 设备未被枚举
cat /sys/kernel/debug/usb/a600000.usb/mode
cat /sys/kernel/debug/usb/a600000.usb/link_state
dmesg | grep -i usb
USB 摄像头不工作
lsusb
ls /dev/video*
dmesg | grep -i uvc
lsmod | grep uvcvideo
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