serial.serialutil.SerialException:[Errno 16] 无法打开端口:[Errno 16] 设备或​​资源繁忙:'/dev/ttyACM0' [英] serial.serialutil.SerialException: [Errno 16] could not open port: [Errno 16] device or resource busy: '/dev/ttyACM0'

问题描述

我正在尝试使用 Pyserial python 库将 Arduino Uno 的串行输出打印到我的屏幕上.

I'm trying to print serial output from Arduino Uno onto my screen using Pyserial python library.

这是我的 Arduino 代码.它只是生成随机数并将其打印到串行监视器:

Here is my Arduino code. It just produces and prints random numbers to serial monitor:

void setup() {
Serial.begin(9600);

}

void loop() {
    long rand = random(10);
    Serial.print(rand);
}

我的python代码只是应该将串行值打印到命令行上，这是代码:

My python code is just supposed to print the values from serial onto the command line, here is the code:

#!/usr/bin/python

import serial

ser = serial.Serial("/dev/ttyACM0",9600)
while True:
    thing = ser.readline()
    print(thing)

当 Arduino 向串行监视器打印随机数时，我运行了我的 python 脚本并得到错误:

While Arduino is printing random numbers to the serial monitor, I run my python script and get the error:

Traceback (most recent call last):
  File "/home/archimedes/anaconda3/lib/python3.6/site-packages/serial/serialposix.py", line 265, in open
    self.fd = os.open(self.portstr, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
OSError: [Errno 16] Device or resource busy: '/dev/ttyACM0'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "pythonSerialTest.py", line 6, in <module>
    ser = serial.Serial("/dev/ttyACM0",9600)
  File "/home/archimedes/anaconda3/lib/python3.6/site-packages/serial/serialutil.py", line 240, in __init__
    self.open()
  File "/home/archimedes/anaconda3/lib/python3.6/site-packages/serial/serialposix.py", line 268, in open
    raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))
serial.serialutil.SerialException: [Errno 16] could not open port /dev/ttyACM0: [Errno 16] Device or resource busy: '/dev/ttyACM0'

推荐答案

我收到 resource busy 错误 因为 Python 正在尝试访问串行监视器，但是因为我将代码上传到 Arduino命令:sudo make upload monitor clean，我的电脑正在从 Arduino 访问串行监视器，这阻止了 Python 能够从 Arduino 访问串行监视器.现在，如果我打算使用 Python 访问串行监视器，我只需使用 sudo make upload clean 将代码上传到 Arduino，并排除命令 monitor.

I was getting the resource busy error because Python was trying to access the serial monitor, but since I uploaded my code to Arduino with the command: sudo make upload monitor clean, my PC was getting access to the serial monitor from Arduino, which prevented Python from being able to access the serial monitor from Arduino. Now I just upload the code to Arduino with sudo make upload clean and exclude the command monitor if I plan to use Python to access the serial monitor.

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