树莓派4 Ubuntu 20.04下FTDI串口接收数据持续丢字符问题

环境配置 #

• 设备：树莓派4，搭载Ubuntu 20.04系统
• USB转串口设备：VID=0eb8，PID=ea02，使用ftdi_sio驱动
• 自定义udev规则：

ACTION=="add", \
ATTRS{idVendor}=="0eb8", \
ATTRS{idProduct}=="ea02", \
RUN+="/usr/sbin/modprobe ftdi_sio" \
RUN+="/usr/bin/sh -c 'echo 0eb8 ea02 > /sys/bus/usb-serial/drivers/ftdi_sio/new_id'"

ACTION=="remove", \
ATTRS{idVendor}=="0eb8", \
ATTRS{idProduct}=="ea02", \
RUN+="/usr/bin/sh -c 'echo usb-Mettler-Toledo_Seven_Excellence-if00-port0 > /sys/bus/usb/drivers/ftdi_sio/unbind'"

问题现象 #

Windows系统下用YAT、minicom等终端接收数据完全正常，但Linux下每接收62个字符就丢失2个字符。尝试过screen、minicom、Python等多种读取工具，问题一致；已确认使用树莓派官方电源供电。

已尝试配置dsrdtr、rtscts及xonxoff等流控参数，发送设备串口参数推测为：波特率9600、数据位8、无校验、可能启用xonxoff（该参数来自设备其他功能说明，未完全确认）。

数据丢失示例：

b'{丢失了"<?"}xml version="1.0" encoding="utf-8" standalone="yes" ?>&lt;Telegra{丢失了"m "}xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http:/{丢失了"/w"}ww.w3.org/2001/XMLSchema-instance" xmlns="LancePlatform"&gt;&lt;EndO{丢失了"fM"}ethod&gt;&lt;m_timestamp&gt;2023-10-24T16:20:35.0000&lt;/m_timestamp&gt;&lt;m_eA{丢失了"na"}lysisStatus&gt;1&lt;/m_eAnalysisStatus&gt;&lt;m_uiJobId&gt;2&lt;/m_uiJobId&gt;&lt;m_us{丢失了"er"}&gt;&lt;/m_user&gt;&lt;/EndOfMethod&gt;&lt;/Telegram&gt;\r\n'

补充错误日志 #

在dmesg中捕获到相关错误信息，目前未找到有效解决方案：

[ 7150.279471] ftdi_sio ttyUSB0: error from flowcontrol urb
[ 7151.045999] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity
[ 7151.054621] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 7151.062250] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 7151.069459] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 7151.075976] ftdi_sio ttyUSB0: error from flowcontrol urb
[ 7258.303870] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity
[ 7258.312491] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 7258.320253] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 7258.327452] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 7258.333835] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 7258.341355] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 7258.347832] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 7264.638935] ttyUSB ttyUSB0: 1 input overrun(s)
[ 7268.853097] ttyUSB ttyUSB0: 32 input overrun(s)
[ 7275.768053] ttyUSB ttyUSB0: 4 input overrun(s)
[ 7323.578412] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 8465.312963] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity
[ 8465.321780] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 8465.329355] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 8465.336715] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 8465.343213] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 8465.349976] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 8465.359343] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity
[ 8465.367975] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 8465.375468] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 8538.369178] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 8564.307661] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity
[ 8564.316412] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 8564.324032] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 8564.331160] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 8564.337661] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 8564.344415] ftdi_sio ttyUSB0: failed to get modem status: -32
[ 8564.353790] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity
[ 8564.362411] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
[ 8564.369917] ftdi_sio ttyUSB0: failed to set flow control: -32
[ 8586.585832] ftdi_sio ttyUSB0: failed to get modem status: -32

内容的提问来源于stack exchange，提问作者lalannou