我正在使用tkinter根据我正在阅读的电压显示一些标签。但是，它在一次读取后停止执行。我发现它是由于root.mainloop（）。但我无法修复它。我已经包含了我的代码。 root.mainloop（）位于while True的末尾。
from Tkinter import *
import spidev
import time
import os
import RPi.GPIO as GPIO
import numpy
GPIO.cleanup()
GPIO.setmode(GPIO.BOARD)
GPIO.setup(7, GPIO.OUT)
GPIO.setup(11, GPIO.OUT)
GPIO.setup(13, GPIO.OUT)
GPIO.setup(15, GPIO.OUT)
GPIO.setup(12, GPIO.OUT)
adcvolt = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
batvolt = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
root = Tk() #Makes the window
w,h = root.winfo_screenwidth(), root.winfo_screenheight()
root.overrideredirect(1)
root.geometry("%dx%d+0+0"%(w,h))
labelFont = ("times",15 ,"bold", "italic")
labelText1 = StringVar()
labelText2 = StringVar()
labelText3 = StringVar()
labelText4 = StringVar()
labelText5 = StringVar()
labelText6 = StringVar()
labelText1.set("Battery Management System")
label1 = Label(root, textvariable=labelText1, height=3, anchor="center")
label1.config(font=labelFont)
label1.pack()
labelText2.set("Wait")
label2 = Label(root, textvariable=labelText2, height=3, anchor="center")
label2.config(font=labelFont)
label2.pack()
labelText3.set("Wait")
label3 = Label(root, textvariable=labelText3, height=3, anchor="center")
label3.config(font=labelFont)
label3.pack()
labelText4.set("Wait")
label4 = Label(root, textvariable=labelText4, height=3, anchor="center")
label4.config(font=labelFont)
label4.pack()
labelText5.set("Wait")
label5 = Label(root, textvariable=labelText5, height=3, anchor="center")
label5.config(font=labelFont)
label5.pack()
labelText6.set("Wait")
label6 = Label(root, textvariable=labelText6, height=3, anchor="center")
label6.config(font=labelFont)
label6.pack()
#root.wm_title("Window Title") #Makes the title that will appear in the top left
#root.config(background = "#FFFFFF") #sets background color to white
# Open SPI bus
spi = spidev.SpiDev()
spi.open(0,0)
# Function to read SPI data from MCP3008 chip
# Channel must be an integer 0-7
def ReadChannel(channel):
adc = spi.xfer2([1,(8+channel)<<4,0])
data = ((adc[1]&3) << 8) + adc[2]
return data
#Function to select multiplexer channel on 74HCT4067 chip
#Channel must be an integer 0-15
def MuxSelect(muxchannel):
if muxchannel == 0:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 1:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 2:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 3:
GPIO.output(7,0)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,1)
elif muxchannel == 4:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 5:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 6:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 7:
GPIO.output(7,0)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,1)
elif muxchannel == 8:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 9:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 10:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 11:
GPIO.output(7,1)
GPIO.output(11,0)
GPIO.output(13,1)
GPIO.output(15,1)
elif muxchannel == 12:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,0)
elif muxchannel == 13:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,0)
GPIO.output(15,1)
elif muxchannel == 14:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,0)
elif muxchannel == 15:
GPIO.output(7,1)
GPIO.output(11,1)
GPIO.output(13,1)
GPIO.output(15,1)
# Function to convert data to voltage level,
# rounded to specified number of decimal places.
def ConvertVolts(data,places):
volts = (data * 3.3) / 1023
volts = round(volts,places)
return volts
# Define sensor channels
voltage_channel = 0
# Define delay between readings
delay = 2
while True:
count = 0
while count<15:
MuxSelect(count)
# Read the voltage sensor data
voltage_level = ReadChannel(voltage_channel)
voltage_volts = ConvertVolts(voltage_level,2)
adcvolt[count] = voltage_volts
batvolt[count] = adcvolt[count] * 2.842
#print adcvolt[count]
#print batvolt[count]
#print count
count = count + 1
#time.sleep(delay)
labelText2.set('Cell1= '+str(batvolt[0])+'V Cell2= ' +str(batvolt[1])+'V Cell3= '+str(batvolt[2]))
#root.update()
labelText3.set('Cell4= '+str(batvolt[3])+'V Cell5= ' +str(batvolt[4])+'V Cell6= '+str(batvolt[5]))
# root.update()
labelText4.set('Cell7= '+str(batvolt[6])+'V Cell8= ' +str(batvolt[7])+'V Cell9= '+str(batvolt[8]))
# root.update()
labelText5.set('Cell10= '+str(batvolt[9])+'V Cell11= ' +str(batvolt[10])+'V Cell12= '+str(batvolt[11]))
# root.update()
labelText6.set('Cell13= '+str(batvolt[12])+'V Cell14= ' +str(batvolt[13])+'V Cell15= '+str(batvolt[14]))
root.update()
print "shit"
medianvolt = numpy.median(batvolt)
maxvolt = max(batvolt)
minvolt = min(batvolt)
diff1 = maxvolt-medianvolt
diff2 = medianvolt-minvolt
if diff1>0.02 or diff2>0.02:
GPIO.output (12,1)
time.sleep(120)
GPIO.output (12,0)
# Wait before repeating loop
time.sleep(delay)
root.update()
root.mainloop() #start monitoring and updating the GUI. Nothing below here runs.
答案 0 :(得分：4)
Tkinter需要mainloop才能工作（调用后面的所有功能）
使用root.after(time_ms, function_name_without_() )（mainloop之前）
运行一些函数 - 该函数必须运行相同的after(...)才能循环工作。
在Tkinter中你不能使用while True，因为while True是（主要）循环
但是Tkinter拥有自己的mainloop。
并且不要使用sleep() - 使用after()
将while True中的所有代码（mainloop除外）放入某个函数中，然后使用after()调用它。
使用第二个after()代替sleep()。
import Tkinter as tk
master = tk.Tk()
def my_mainloop():
print "Hello World!"
master.after(1000, my_mainloop)
master.after(1000, my_mainloop)
master.mainloop()
答案 1 :(得分：0)
使用线程库：
此代码创建了两个线程，一个运行 tkinter 程序，另一个线程将在无限循环中打印数字
from threading import Thread
from time import sleep
from tkinter import *
root = Tk()
def k(arg):
global root
l = Label(root)
l.pack()
e = Entry(root)
e.pack()
def submit():
l.configure(text = e.get())
Button(text="Submit",command=submit).pack()
i = 0
def threaded_function(arg):
global i
while True:
print(i)
i+=1
sleep(1)
if __name__ == "__main__":
thread2 = Thread(target = k, args = (12,))
thread = Thread(target = threaded_function, args = (12,))
thread2.start()
thread.start()
root.mainloop()
答案 2 :(得分：-1)
我发现一个更好的替代解决方案-只需在另一个线程中启动while循环，然后使用全局变量即可。这样，我的代码就可以完美地工作了。