与 Tkinter 的串行通信

Question

我正在用 Python 编写一些代码来制作一个控制电子板的 GUI。 我将按钮放在 GUI 上并通过单击它来发送命令。这部分有效。 但我需要接收来自开发板的信息来更改 GUI 中的一些内容。这是我没有成功完成的部分。 我在this question 中找到了一些提示，可以让我在没有 GUI 的情况下读取 COM 端口。当我尝试添加一个带有输入框的窗口并用传入的值刷新它时，我什么也没看到。
这是我的代码：

import serial
import threading
from time import sleep
from Tkinter import*
import sys

wind=Tk()
global var
var=StringVar(wind)
var.set("value 1")
entry_COM=Entry(wind,textvariable=var)
entry_COM.place(x=0,y=0,width=100,height=50)        
ser = serial.Serial(port='COM1',baudrate=115200,parity=serial.PARITY_NONE,stopbits=serial.STOPBITS_ONE,bytesize=serial.EIGHTBITS,timeout=0)
global thread 
thread= None
stop_task = threading.Event()

def do_task():
    global var
    var.set("value 2")
    for i in xrange(1):
        if stop_task.is_set():
            break
        print(i)
        sleep(1)

while True:  
        byte = ser.read(1)    # No need for a loop here, read(1) returns a length 1 string
        character = byte  # I'm not familiar with the serial module, but I think this isn't needed
        if character == 'S':
            # We check that we are not executing the task already, and if so we handle it accordingly
            if thread:
                print('Error: a task is already running!')
                continue
            # Start the task in a thread
            stop_task.clear()
            thread = threading.Thread(target=do_task)
            thread.start()
        elif character == 'K':
            print('K received -> BREAK FROM TASK')
            if thread:
                stop_task.set()
                thread = None
        elif character == 'E':
            ser.close()
            print "closed"
            try:
                wind.destroy()
            except:
                pass
            sys.exit()
        wind.mainloop()

当我运行它时，窗口没有打开，但其余的工作正常。 你有什么建议给我吗？

Answer 1

实际上，我成功编写了一个脚本，该脚本读取我发送的内容并允许我在按下按钮时编写一个链 从串行导入 * 从 Tkinter 导入 *

class serial_test(object):
    def __init__(self):
        self.serialPort = "COM1"
        self.baudRate = 9600
        self.ser = Serial(self.serialPort , self.baudRate, timeout=0, writeTimeout=0) #ensure non-blocking
        #make a TkInter Window
        self.root = Tk()
        self.root.wm_title("Reading Serial")      
        # make a scrollbar
        self.scrollbar = Scrollbar(self.root)
        self.scrollbar.pack(side=RIGHT, fill=Y)       
        # make a text box to put the serial output
        self.log = Text ( self.root, width=30, height=30, takefocus=0)
        self.log.pack()       
        # attach text box to scrollbar
        self.log.config(yscrollcommand=self.scrollbar.set)
        self.scrollbar.config(command=self.log.yview)
        #make our own buffer
        self.buff=0
        self.bou=Button(self.root,text='Valid',command=self.writeSerial)
        self.bou.pack()
        self.root.after(100, self.readSerial)        
        self.root.protocol("WM_DELETE_WINDOW", self.Intercept)
        self.root.mainloop()
    def Intercept(self):
        try : 
            self.ser.close()
        except:
            pass
        self.root.destroy()
    def writeSerial(self):
        self.ser.write("Testing")

    def readSerial(self):
        while True:
            self.c = self.ser.read() # attempt to read a character from Serial
            #was anything read?
            if len(self.c) == 0:
                break
            # get the buffer from outside of this function
            self.log.insert(END, self.c)
            self.buff=self.buff+1
            if self.c == '\r':
                for i in range(30-self.buff):
                    self.log.insert(END, ' ')
                    self.buff=0

            if self.buff==30:
                self.buff=0
        self.root.after(10, self.readSerial) # check serial again soon
serial_test()

Answer 2

import serial
from tkinter import *
class serial_test(object):
    def __init__(self):
        self.serialPort = "COM5"
        self.baudRate = 9600
        self.ser = serial.Serial(self.serialPort , self.baudRate, timeout=0, writeTimeout=0) #ensure non-blocking
        #make a TkInter Window
        self.root = Tk()
        self.root.wm_title("Reading Serial")
        # make a scrollbar
        self.scrollbar = Scrollbar(self.root)
        self.scrollbar.pack(side=RIGHT, fill=Y)
        # make a text box to put the serial output
        self.log = Text ( self.root, width=30, height=30, takefocus=0)
        self.log.pack()
        # attach text box to scrollbar
        self.log.config(yscrollcommand=self.scrollbar.set)
        self.scrollbar.config(command=self.log.yview)
        #make our own buffer
        self.buff=0
        self.bou=Button(self.root,text='Valid',command=self.writeSerial)
        self.bou.pack()
        self.root.after(100, self.readSerial)
        self.root.protocol("WM_DELETE_WINDOW", self.Intercept)
        self.root.mainloop()
    def Intercept(self):
        try :
            self.ser.close()
        except:
            pass
        self.root.destroy()
    def writeSerial(self):
        self.ser.write("Testing")

    def readSerial(self):
        while True:
            self.c = self.ser.read() # attempt to read a character from Serial
            #was anything read?
            if len(self.c) == 0:
                break
            # get the buffer from outside of this function
            self.log.insert(END, self.c)
            self.buff=self.buff+1
            if self.c == '\r':
                for i in range(30-self.buff):
                    self.log.insert(END, ' ')
                    self.buff=0

            if self.buff==30:
                self.buff=0
        self.root.after(10, self.readSerial) # check serial again soon
a=serial_test()
a.readSerial()