在Tkinter文本框中显示从串行端口读取的处理数据时，将其发布

Question

因此，我正在从串行连接中读取（并使用tkinter文本框显示）数据，但是为了运行测试，我无法按自己的意愿处理返回的数据。用更简单的术语来说，即使machine response = 0x1显示了，我也无法从global读取它serBuffer。

在将其显示给textboxi 之前，我将从测试内部进行读取function，然后检查响应是否在中string，但是现在我将读取的数据（字符串）传递给全局变量，然后尝试读取它，似乎没有工作，除非我serBuffer = ""从中删除了readserial。但是，这导致了一个新问题。当我按下按钮发送命令时，它将发送该命令，但仅在第二次按下后以及每次之后才收到响应。因此，Fail如果我运行一次测试，我会得到一个结果，但是之后我每次都会通过。

带有所需响应的图片（test function不读取0x1并始终返回FAIL）

带有不期望的响应的图片（仅在第二次按下后以及每次之后才收到响应。因此，如果我运行一次测试，则结果为“失败”，但之后每次均得到通过） 。

import tkinter as tk
import serial
from serial import *


serialPort = "COM3"
baudRate = 115200
ser = Serial(serialPort, baudRate, timeout=0, writeTimeout=0) #ensure non-blocking


#make a TkInter Window
mainWindow = tk.Tk()
mainWindow.wm_title("Reading Serial")
mainWindow.geometry('1650x1000+500+100')




scrollbar = tk.Scrollbar(mainWindow)
scrollbar.pack(side=tk.RIGHT, fill=tk.Y)

log = tk.Text ( mainWindow, width=60, height=60, takefocus=0)
log.pack()

log.config(yscrollcommand=scrollbar.set)
scrollbar.config(command=log.yview)

#make our own buffer
#useful for parsing commands
#Serial.readline seems unreliable at times too
serBuffer = ""
ser.write(b'\r\n')

def readSerial():
    while True:
        c = (ser.read().decode('utf-8', 'ignore'))  # attempt to read a character from Serial
        # was anything read?
        if len(c) == 0:
            break

        # get the buffer from outside of this function
        global serBuffer

        # check if character is a delimeter
        if c == '\r':
            serBuffer += "\n" # don't want returns. chuck it

        if c == '\n':
            serBuffer += "\n"  # add the newline to the buffer

            # add the line to the TOP of the log
            log.insert('1.1', serBuffer)
            serBuffer = ""  # empty the buffer
        else:
            serBuffer += c  # add to the buffer

    mainWindow.after(100, readSerial)  # check serial again soon

def test():
    command = b" test command \r\n"
    ser.write(command)
    global serBuffer
    time.sleep(0.5)
    if "0x1" in serBuffer:
        print('PASS')
        return 'PASS'
    else:
        print('FAIL')
        return 'FAIL'

button = tk.Button(mainWindow, text="Pone Test", font=40, bg='#b1c62d', command=test)
button.place(relx=0.8, rely=0, relwidth=0.1, relheight=0.05)


# after initializing serial, an arduino may need a bit of time to reset
mainWindow.after(100, readSerial)

mainWindow.mainloop()

Answer 1

注释：但仅在第二次按下后以及每次之后才收到响应。因此，如果我运行一次测试，我会失败，但是之后每次都通过

提高第一次超时时间，100以提高500矿石利用率。

        # after initializing serial, an arduino may need a bit of time to reset
        mainWindow.after(100, self.readSerial)

要找出第一个响应的延迟，请尝试以下操作：

注意：您必须在不运行的情况下执行此操作def readSerial，以防止同时出现in buffer“

    command = b" test command \r\n"
    self.ser.write(command)

    delay = 0.0

    # wait until you get `.in_waiting` data.
    while not self.ser.in_waiting:
        time.sleep(0.1)
        delay += 0.1
        print('.', end='')
        if delay >= 10:
            print('BREAK after {} no in_waiting'.format(int(delay * 10)))
            break

    print('Delay:{}, in_waiting:{}'.format(delay, self.ser.in_waiting))

以下对我有用。

注意：我使用OOP语法。

1. last_command

   serBuffer = ""
   last_command = None
   

2. 复制就绪read_buffer到last_command，仅空read_buffer

   def readSerial(self):
       while True:
           c = (self.ser.read().decode('utf-8', 'ignore'))  # attempt to read a character from Serial
           # was anything read?
           if len(c) == 0:
               break
   
           # get the buffer from outside of this function
           global serBuffer
   
           # check if character is a delimeter
           if c == '\r':
               serBuffer += "\n"  # don't want returns. chuck it
   
           if c == '\n':
               serBuffer += "\n"  # add the newline to the buffer
   
               global last_command
               last_command = serBuffer
   
               # add the line to the TOP of the log
               # log.insert('1.1', last_command)
               print('readSerial.last_command:"{}"'.format(bytes(last_command, 'utf-8')))
   
               serBuffer = ""  # empty the buffer
   
           else:
               serBuffer += c  # add to the buffer
               print('readSerial:"{}"'.format(bytes(serBuffer, 'utf-8')))
   
       self.after(100, self.readSerial)  # check serial again soon
   

3. 做 test()

   def test(self, write=True):
       print('test(write={})'.format(write))
   
       if write:
           command = b" test command \r\n"
           self.ser.write(command)
           self.after(500, self.test, False)
   
       elif last_command is not None:
           print('last_command:{}'.format(bytes(last_command, 'utf-8')))
   
           if "0x1" in last_command:
               print('PASS')
           else:
               print('FAIL')
       else:
           # ATTENTION: This could lead to a infinit loop
           # self.after(500, self.test, False)
           pass
   

输出：

test(write=True)
readSerial:"b' '"
readSerial:"b' t'"
readSerial:"b' te'"
readSerial:"b' tes'"
readSerial:"b' test'"
readSerial:"b' test '"
readSerial:"b' test c'"
readSerial:"b' test co'"
readSerial:"b' test com'"
readSerial:"b' test comm'"
readSerial:"b' test comma'"
readSerial:"b' test comman'"
readSerial:"b' test command'"
readSerial:"b' test command '"
readSerial:"b' test command \n\r'"
readSerial.last_command:"b' test command \n\r\n'"
test(write=False)
last_command:b' test command \n\r\n'
FAIL

注意：我得到了FAIL，因为0x1在last_command使用PORT = 'loop://'哪个回显时没有输入内容！

Answer 2

我做了一些更改，检查这一点。

def readSerial():
    while True:
        c = (ser.read(1).decode('utf-8', 'ignore')) from Serial

        if len(c) == 0:
            break


        global serBuffer
        if c == '\r':
            serBuffer += "" 

        if c == '\n':
            serBuffer += "\n" 



            log.insert(tk.END, serBuffer)
            log.see(tk.END)
            log.update_idletasks()
            serBuffer = ""  
        else:
            serBuffer += c  

    mainWindow.after(500, readSerial)