我无法打开FTDI FT2232HQ芯片的串行端口

问题描述

我有一个PYNQ-Z2板，它包含FT2232HQ芯片，可将数据从USB转换为JTAG和UART

问题是电路板正在工作并且被Vivado检测到（我可以对其进行编程），但是该设备没有显示为/dev/ttyUSB*设备，而是显示为/dev/ftdi-x（其中x是一个随机数），我无法使用此设备文件打开串行端口。

我使用了lsusb命令，发现正确检测到了芯片：

Bus 003 Device 017: ID 0403:6010 Future Technology Devices International,Ltd FT2232C Dual USB-UART/FIFO IC

此后，我尝试检查syslog文件，并注意到两个奇怪的行为，第一个是当我连接电路板时，识别出两个ttyUSB设备，而不是一个！ /dev/ttyUSB0和/dev/ttyUSB1。

第二个行为是这两个设备在连接后立即断开连接。

这是完整的 syslog ：

Oct 27 11:45:20 ao20xa kernel: [73109.798748] usb 3-4: new high-speed USB device number 17 using xhci_hcd
Oct 27 11:45:21 ao20xa kernel: [73109.949757] usb 3-4: New USB device found,idVendor=0403,idProduct=6010
Oct 27 11:45:21 ao20xa kernel: [73109.949761] usb 3-4: New USB device strings: Mfr=1,Product=2,SerialNumber=3
Oct 27 11:45:21 ao20xa kernel: [73109.949763] usb 3-4: Product: TUL
Oct 27 11:45:21 ao20xa kernel: [73109.949765] usb 3-4: Manufacturer: Xilinx
Oct 27 11:45:21 ao20xa kernel: [73109.949767] usb 3-4: SerialNumber: 1234-tul
Oct 27 11:45:21 ao20xa kernel: [73109.950844] ftdi_sio 3-4:1.0: FTDI USB Serial Device converter detected
Oct 27 11:45:21 ao20xa kernel: [73109.950899] usb 3-4: Detected FT2232H
Oct 27 11:45:21 ao20xa kernel: [73109.951100] usb 3-4: FTDI USB Serial Device converter now attached to ttyUSB0
Oct 27 11:45:21 ao20xa kernel: [73109.951815] ftdi_sio 3-4:1.1: FTDI USB Serial Device converter detected
Oct 27 11:45:21 ao20xa kernel: [73109.951861] usb 3-4: Detected FT2232H
Oct 27 11:45:21 ao20xa kernel: [73109.952058] usb 3-4: FTDI USB Serial Device converter now attached to ttyUSB1
Oct 27 11:45:21 ao20xa mtp-probe: checking bus 3,device 17: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-4"
Oct 27 11:45:21 ao20xa mtp-probe: bus: 3,device: 17 was not an MTP device
Oct 27 11:45:21 ao20xa systemd-udevd[18701]: Process '/bin/sh -c 'basename $(dirname $(realpath /sys/devices/pci0000:00/0000:00:14.0/usb3/3-4/device)) > /sys/bus/usb/drivers/ftdi_sio/unbind'' failed with exit code 1.
Oct 27 11:45:21 ao20xa kernel: [73110.089464] ftdi_sio ttyUSB1: FTDI USB Serial Device converter now disconnected from ttyUSB1
Oct 27 11:45:21 ao20xa kernel: [73110.089536] ftdi_sio 3-4:1.1: device disconnected
Oct 27 11:45:21 ao20xa kernel: [73110.089818] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
Oct 27 11:45:21 ao20xa kernel: [73110.089865] ftdi_sio 3-4:1.0: device disconnected
Oct 27 11:45:21 ao20xa snapd[16139]: hotplug.go:199: hotplug device add event ignored,enable experimental.hotplug
Oct 27 11:45:21 ao20xa upowerd[1835]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0
Oct 27 11:45:21 ao20xa snapd[16139]: hotplug.go:199: hotplug device add event ignored,enable experimental.hotplug
Oct 27 11:45:21 ao20xa upowerd[1835]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.1
Oct 27 11:45:21 ao20xa systemd-udevd[18701]: Process '/bin/sh -c 'basename $(dirname $(realpath /sys/devices/pci0000:00/0000:00:14.0/usb3/3-4/device)) > /sys/bus/usb/drivers/ftdi_sio/unbind'' failed with exit code 1.
Oct 27 11:45:21 ao20xa upowerd[1835]: unhandled action 'bind' on /sys/devices/pci0000:00/0000:00:14.0/usb3/3-4
Oct 27 11:45:21 ao20xa ModemManager[1044]: <info>  (tty/ttyUSB0): released by device '/sys/devices/pci0000:00/0000:00:14.0/usb3/3-4'
Oct 27 11:45:21 ao20xa ModemManager[1044]: <info>  (tty/ttyUSB1): released by device '/sys/devices/pci0000:00/0000:00:14.0/usb3/3-4'
Oct 27 11:45:21 ao20xa ModemManager[1044]: <info>  Couldn't check support for device '/sys/devices/pci0000:00/0000:00:14.0/usb3/3-4': Operation was cancelled
Oct 27 11:45:21 ao20xa upowerd[1835]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0
Oct 27 11:45:21 ao20xa upowerd[1835]: unhandled action 'unbind' on /sys/devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.1

所以，我想知道是否有人可以帮助解决此问题。

解决方法

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