rick@rick:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002 Device 002: ID 0bda:9210 Realtek Semiconductor Corp. RTL9210 M.2 NVME Adapter Bus 002 Device 006: ID 2717:5006 Xiaomi Inc. 4-Port USB 3.0 Hub Bus 002 Device 007: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter Bus 002 Device 008: ID 0bda:0412 Realtek Semiconductor Corp. 4-Port USB 3.0 Hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub Bus 003 Device 003: ID 30c9:0041 Luxvisions Innotech Limited USB Camera Bus 003 Device 004: ID 258a:015e BY Tech Gaming Keyboard Bus 003 Device 005: ID 8087:0033 Intel Corp. AX211 Bluetooth Bus 003 Device 006: ID 1ea7:0066 SHARKOON Technologies GmbH [Mediatrack Edge Mini Keyboard] Bus 003 Device 010: ID 2717:5007 Xiaomi Inc. 4-Port USB 2.0 Hub Bus 003 Device 011: ID 0bda:5412 Realtek Semiconductor Corp. 4-Port USB 2.0 Hub Bus 003 Device 016: ID 1a86:7523 QinHeng Electronics CH340 serial converter Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
查看日志发现串口设备被brltty软件占有
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rick@rick:~$ sudo dmesg | grep ttyS* [ 0.069611] printk: legacy console [tty0] enabled [ 1.860154] dw-apb-uart.5: ttyS4 at MMIO 0x4017005000 (irq = 16, base_baud = 6250000) is a 16550A [ 2199.932595] usb 3-3.4: ch341-uart converter now attached to ttyUSB0 [ 2200.584625] usb 3-3.4: usbfs: interface 0 claimed by ch341 while'brltty' sets config #1 [ 2200.585977] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0 [ 3316.829408] usb 3-3.4: ch341-uart converter now attached to ttyUSB0 [ 3317.481054] usb 3-3.4: usbfs: interface 0 claimed by ch341 while'brltty' sets config #1 [ 3317.482143] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0 [ 3387.491640] usb 3-3.4: ch341-uart converter now attached to ttyUSB0 [ 3388.144108] usb 3-3.4: usbfs: interface 0 claimed by ch341 while'brltty' sets config #1 [ 3388.145187] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0 [ 3483.489215] usb 3-3.4: ch341-uart converter now attached to ttyUSB0 [ 3484.149430] usb 3-3.4: usbfs: interface 0 claimed by ch341 while'brltty' sets config #1 [ 3484.150483] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0 [ 4280.418100] usb 3-3.4: ch341-uart converter now attached to ttyUSB0 [ 4281.080859] usb 3-3.4: usbfs: interface 0 claimed by ch341 while'brltty' sets config #1 [ 4281.081944] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
dw-apb-uart.5: ttyS4 at MMIO 0x4017005000 (irq = 16, base_baud = 6250000) is a 16550A：这是关于系统板上的一个串口（ttyS4）的信息，与您的USB串口转换器无关。
usb 3-3.4: ch341-uart converter now attached to ttyUSB0：这条消息表明CH340串口转换器被连接到了ttyUSB0。
usb 3-3.4: usbfs: interface 0 claimed by ch341 while 'brltty' sets config #1：这条消息表明brltty（一个用于盲人和视觉障碍人士的软件）正在尝试使用CH340设备。
ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0：这条消息表明CH340串口转换器从ttyUSB0断开了连接。
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