无法在 Pyserial 中打开串行连接:"termios.error: (22, 'Invalid argument') " [英] Can't open serial connection in Pyserial: "termios.error: (22, 'Invalid argument') "

问题描述

我在执行以下代码时遇到问题:

I'm having problem executing the following code:

import serial

ser = serial.Serial(
    port='/dev/tty.FireFly-16CB-SPP',
    baudrate=115200,
    #parity=serial.PARITY_ODD,
    stopbits=serial.STOPBITS_ONE,
    bytesize=serial.EIGHTBITS
)

ser.open()
ser.isOpen()

昨天成功了，我不知道我改变了什么.现在我收到以下错误消息:

This worked yesterday, and I don't know what I changed. Now I get the following error message:

    Traceback (most recent call last):
  File "main.py", line 32, in <module>
    bytesize=serial.EIGHTBITS
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/serial/serialutil.py", line 260, in __init__
    self.open()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/serial/serialposix.py", line 280, in open
    self._reconfigurePort()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/serial/serialposix.py", line 409, in _reconfigurePort
    termios.tcsetattr(self.fd, TERMIOS.TCSANOW, [iflag, oflag, cflag, lflag, ispeed, ospeed, cc])
termios.error: (22, 'Invalid argument')

我是 Python 的完全初学者，无法解读上面的错误消息.我试过重新安装 Pyserial，但这并没有解决错误.怎么了?

I'm a complete beginner to Python, and can't decipher the error message above. I've tried reinstalling Pyserial, but that didn't fix the error. What is wrong?

推荐答案

我遇到了同样的问题，虽然我使用的是一个 5 端口 USB 集线器，其中插入了 3 个不同的 USB，但结果发现集线器不是提供足够的电力.一旦我得到了一个外部供电的 USB(一个不仅仅是从我的计算机端口上拔掉线路的)，它就可以正常工作.

I had the same issue, though I was using a 5 port USB hub with 3 different USBs all plugged into it, and it turned out the hub wasn't providing enough power. Once I got an externally powered USB (one that wasn't just pulling off the line from my computer's port) it worked just fine.

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