前面我们体验了板上直接开发,以sqlite3构建为例进行了C开发体验，我们现在来以python为例进行体验。实现一个具备实用价值的串口调试助手，一方面体验python开发环境，一方面进行串口测试。
apt-get install python3-tk
apt install python3-serial
下载代码
git clone https://gitee.com/qinyunti/python_tkinter_uart.git
cd python_tkinter_uart/
# UART Tx/Rx demo
import tkinter as tk
from tkinter import ttk
import serial
import threading
# A simple Information Window
class InformWindow:
def __init__(self,informStr):
self.window = tk.Tk()
self.window.title("Information")
self.window.geometry("220x60")
label = tk.Label(self.window, text=informStr)
buttonOK = tk.Button(self.window,text="OK",command=self.processButtonOK)
label.pack(side = tk.TOP)
buttonOK.pack(side = tk.BOTTOM)
self.window.mainloop()
def processButtonOK(self):
self.window.destroy()
class mainGUI:
def __init__(self):
window = tk.Tk()
window.title("GUI UART Tx/Rx Demo")
self.uartState = False # is uart open or not
# a frame contains COM's information, and start/stop button
frame_COMinf = tk.Frame(window)
frame_COMinf.grid(row = 1, column = 1)
labelCOM = tk.Label(frame_COMinf,text="COMx: ")
self.COM = tk.StringVar(value = "/dev/ttyS3")
ertryCOM = tk.Entry(frame_COMinf, textvariable = self.COM)
labelCOM.grid(row = 1, column = 1, padx = 5, pady = 3)
ertryCOM.grid(row = 1, column = 2, padx = 5, pady = 3)
labelBaudrate = tk.Label(frame_COMinf,text="Baudrate: ")
self.Baudrate = tk.IntVar(value = 921600)
ertryBaudrate = tk.Entry(frame_COMinf, textvariable = self.Baudrate)
labelBaudrate.grid(row = 1, column = 3, padx = 5, pady = 3)
ertryBaudrate.grid(row = 1, column = 4, padx = 5, pady = 3)
labelParity = tk.Label(frame_COMinf,text="Parity: ")
self.Parity = tk.StringVar(value ="NONE")
comboParity = ttk.Combobox(frame_COMinf, width = 17, textvariable=self.Parity)
comboParity["values"] = ("NONE","ODD","EVEN","MARK","SPACE")
comboParity["state"] = "readonly"
labelParity.grid(row = 2, column = 1, padx = 5, pady = 3)
comboParity.grid(row = 2, column = 2, padx = 5, pady = 3)
labelStopbits = tk.Label(frame_COMinf,text="Stopbits: ")
self.Stopbits = tk.StringVar(value ="1")
comboStopbits = ttk.Combobox(frame_COMinf, width = 17, textvariable=self.Stopbits)
comboStopbits["values"] = ("1","1.5","2")
comboStopbits["state"] = "readonly"
labelStopbits.grid(row = 2, column = 3, padx = 5, pady = 3)
comboStopbits.grid(row = 2, column = 4, padx = 5, pady = 3)
self.buttonSS = tk.Button(frame_COMinf, text = "Start", command = self.processButtonSS)
self.buttonSS.grid(row = 3, column = 4, padx = 5, pady = 3, sticky = tk.E)
# serial object
self.ser = serial.Serial()
# serial read threading
self.ReadUARTThread = threading.Thread(target=self.ReadUART)
self.ReadUARTThread.start()
frameRecv = tk.Frame(window)
frameRecv.grid(row = 2, column = 1)
labelOutText = tk.Label(frameRecv,text="Received Data:")
labelOutText.grid(row = 1, column = 1, padx = 3, pady = 2, sticky = tk.W)
frameRecvSon = tk.Frame(frameRecv)
frameRecvSon.grid(row = 2, column =1)
scrollbarRecv = tk.Scrollbar(frameRecvSon)
scrollbarRecv.pack(side = tk.RIGHT, fill = tk.Y)
self.OutputText = tk.Text(frameRecvSon, wrap = tk.WORD, width = 60, height = 20, yscrollcommand = scrollbarRecv.set)
self.OutputText.pack()
frameTrans = tk.Frame(window)
frameTrans.grid(row = 3, column = 1)
labelInText = tk.Label(frameTrans,text="To Transmit Data:")
labelInText.grid(row = 1, column = 1, padx = 3, pady = 2, sticky = tk.W)
frameTransSon = tk.Frame(frameTrans)
frameTransSon.grid(row = 2, column =1)
scrollbarTrans = tk.Scrollbar(frameTransSon)
scrollbarTrans.pack(side = tk.RIGHT, fill = tk.Y)
self.InputText = tk.Text(frameTransSon, wrap = tk.WORD, width = 60, height = 5, yscrollcommand = scrollbarTrans.set)
self.InputText.pack()
self.buttonSend = tk.Button(frameTrans, text = "Send", command = self.processButtonSend)
self.buttonSend.grid(row = 3, column = 1, padx = 5, pady = 3, sticky = tk.E)
window.mainloop()
def processButtonSS(self):
# print(self.Parity.get())
if (self.uartState):
self.ser.close()
self.buttonSS["text"] = "Start"
self.uartState = False
else:
# restart serial port
self.ser.port = self.COM.get()
self.ser.baudrate = self.Baudrate.get()
strParity = self.Parity.get()
if (strParity=="NONE"):
self.ser.parity = serial.PARITY_NONE
elif(strParity=="ODD"):
self.ser.parity = serial.PARITY_ODD
elif(strParity=="EVEN"):
self.ser.parity = serial.PARITY_EVEN
elif(strParity=="MARK"):
self.ser.parity = serial.PARITY_MARK
elif(strParity=="SPACE"):
self.ser.parity = serial.PARITY_SPACE
strStopbits = self.Stopbits.get()
if (strStopbits == "1"):
self.ser.stopbits = serial.STOPBITS_ONE
elif (strStopbits == "1.5"):
self.ser.stopbits = serial.STOPBITS_ONE_POINT_FIVE
elif (strStopbits == "2"):
self.ser.stopbits = serial.STOPBITS_TWO
try:
self.ser.open()
except:
infromStr = "Can't open "+self.ser.port
InformWindow(infromStr)
if (self.ser.isOpen()): # open success
self.buttonSS["text"] = "Stop"
self.uartState = True
def processButtonSend(self):
if (self.uartState):
strToSend = self.InputText.get(1.0,tk.END)
bytesToSend = strToSend[0:-1].encode(encoding='ascii')
self.ser.write(bytesToSend)
print(bytesToSend)
else:
infromStr = "Not In Connect!"
InformWindow(infromStr)
def ReadUART(self):
# print("Threading...")
while True:
if (self.uartState):
try:
ch = self.ser.read().decode(encoding='ascii')
print(ch,end='')
self.OutputText.insert(tk.END,ch)
except:
infromStr = "Something wrong in receiving."
InformWindow(infromStr)
self.ser.close() # close the serial when catch exception
self.buttonSS["text"] = "Start"
self.uartState = False
mainGUI()
板上默认使能了串口1,串口0为调试串口。
串口3需要修改设备树使能，我们以串口1测试。
串口1对应设备/dev/ttyS1
我们将串口1使用串口线接到PC，
开发板和PC上位机相互发送数据测试
python3 Python_Tkinter_UART.py
测试如下收发OK
得益于开发版运行完整的Debian系统和优秀的性能，具备完整的Python开发环境，可以直接安装python包，可以方便快捷高效的进行开发。
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