串口读写代码连接冲突 [英] Clash of connection between serial port read and write codes

问题描述

这是从z1节点读取的代码

This is the code that reads from the z1 mote

while True:
   if not ser.isOpen():
      try:
        ser = serial.Serial(z1port, z1baudrate,timeout=0, parity=serial.PARITY_NONE, 

                    stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)
      except:
        sys.exit("Error connecting device")

   queue = ser.inWaiting()
   if queue > 0:
      data = ser.read(1000)
      print data 
   time.sleep(0.2)

这是我用它来写入节点的代码

And this is the code that I have that I use it to write to the mote

# some event-driven code here so that whenever a message is received then do: 
print(str(msg.payload))
ser = serial.Serial("/dev/ttyUSB1")
print ser.isOpen()
ser.write(msg.payload)

第二个代码的输出应该是 if msg.payload = "hello":

The output from the second code should be if msg.payload = "hello":

hello 
True 

但随后读取的代码停止从串行端口读取(代码将运行但没有输入).我该如何解决这个问题?

But then the read code stops reading from the serial port (the code will run but no input). How do I solve this problem?

推荐答案

我使用@mhopeng 的想法编写了一个实现多线程编程的代码，其中一个函数处理读取，另一个处理写入.在它们都被调用之前，我将连接到串行端口并将其传递给两个线程.

I used the idea by @mhopeng to write a code that implements multithreading programming, where one function handles the reading and the other handles the writing. And before they are both called, I will connect to the serial port and pass it to both of the threads.

我不得不使用多线程，因为我需要一个单独的线程来随时根据用户输入进行写入.

I had to use multithreading because I needed a separate thread for writing at any time from the user input.

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