小贝子编程

树莓派线程



我是编程新手。 我正在用双脚跳进去，构建一个项目，该项目将读取GPIO引脚(机器是Raspberry Pi)输入电压，最终将显示在qt创建器中的lcdnumber小部件上。 目前，我正在使用光电管作为o2电池的替代品，该电池将成为最终组件。 感谢大家发布代码，我有光电管的工作代码，它可以很好地打印电压。为了获得恒定和连续的电压，我正在使用一段时间的真回路。 当然，当我运行程序时，循环会接管，程序的另一部分不会运行。 另一部分是带有 lcdnumber 显示屏和一些按钮的 GUI，最终将连接到数字电位器。 GUI本身运行良好。 光电管代码本身效果很好。 将两者结合起来是我遇到问题的地方。 从我过去几天读到的内容来看，在python或Qt中线程似乎是要走的路。 我已经阅读了我能找到的所有示例和解释，但我被困住了。 gui 弹出并起作用，循环似乎没有运行。光电管的输出现在正在打印到终端，或者通常在我自己运行该代码时打印，因为我还不知道如何将其连接到Qt lcd。

如果有人可以查看我的代码并让我知道我在线程方面出了什么问题，以及由于我还在学习，您可能看到的任何其他内容，我将不胜感激。 任何关于将光电管信号连接到Qt LCD的提示也将是一个巨大的帮助。

我正在使用Raspbian(Debian Linux的变体)和Qt4/Qt Creator 3.2.1

请让我知道您可能需要或想要的其他信息。

import sys
import RPi.GPIO as GPIO
import time
import re
from PyQt4 import QtGui, uic, QtCore
from PyQt4.QtCore import QThread
import spidev
import os
import threading
from threading import Thread
GPIO.setmode(GPIO.BCM) 
GPIO.setwarnings(False)
o2zero = 26
o2span = 19
cozero = 13
cospan = 6
co2zero = 5
co2span = 21
status = "nil"
light_channel = 0
spi = spidev.SpiDev()
spi.open(0,0)
class MyWindow(QtGui.QMainWindow): 
def __init__(self):
super(MyWindow, self).__init__()
uic.loadUi('mainwindow.ui', self)
self.show()
QtCore.QObject.connect(self.o2_zero_up,QtCore.SIGNAL("clicked()"), self.o2zeroup) 
QtCore.QObject.connect(self.o2_zero_down,QtCore.SIGNAL("clicked()"), self.o2zerodown)
QtCore.QObject.connect(self.o2_span_up,QtCore.SIGNAL("clicked()"), self.o2spanup)
QtCore.QObject.connect(self.o2_span_down,QtCore.SIGNAL("clicked()"), self.o2spandown)
QtCore.QObject.connect(self.co_zero_up,QtCore.SIGNAL("clicked()"), self.cozeroup)
QtCore.QObject.connect(self.co_zero_down,QtCore.SIGNAL("clicked()"), self.cozerodown)
QtCore.QObject.connect(self.co_span_up,QtCore.SIGNAL("clicked()"), self.cospanup)
QtCore.QObject.connect(self.co_span_down,QtCore.SIGNAL("clicked()"), self.cospandown)
QtCore.QObject.connect(self.co2_zero_up,QtCore.SIGNAL("clicked()"), self.co2zeroup)
QtCore.QObject.connect(self.co2_zero_down,QtCore.SIGNAL("clicked()"), self.co2zerodown)
QtCore.QObject.connect(self.co2_span_up,QtCore.SIGNAL("clicked()"), self.co2spanup)
QtCore.QObject.connect(self.co2_span_down,QtCore.SIGNAL("clicked()"), self.co2spandown)  
QtCore.QObject.connect(self.close_button,QtCore.SIGNAL("clicked()"), self.gpiocleanup) 
def o2zeroup(self):  
GPIO.setup(o2zero, GPIO.OUT)   
GPIO.output(o2zero, 1) 
def o2zerodown(self): 
GPIO.setup(o2zero, GPIO.OUT) 
GPIO.output(o2zero, 0) 
def o2spanup(self):  
GPIO.setup(o2span, GPIO.OUT)  
GPIO.output(o2span, 1) 
def o2spandown(self): 
GPIO.setup(o2span, GPIO.OUT) 
GPIO.output(o2span, 0) 
def cozeroup(self):  
GPIO.setup(cozero, GPIO.OUT)  
GPIO.output(cozero, 1) 
def cozerodown(self):
GPIO.setup(cozero, GPIO.OUT)  
GPIO.output(cozero, 0) 
def cospanup(self):
GPIO.setup(cospan, GPIO.OUT)   
GPIO.output(cospan, 1) 
def cospandown(self): 
GPIO.setup(cospan, GPIO.OUT) 
GPIO.output(cospan, 0)
def co2zeroup(self):
GPIO.setup(co2zero, GPIO.OUT)   
GPIO.output(co2zero, 1) 
def co2zerodown(self): 
GPIO.setup(co2zero, GPIO.OUT) 
GPIO.output(co2zero, 0)
def co2spanup(self):
GPIO.setup(co2span, GPIO.OUT)   
GPIO.output(co2span, 1) 
def co2spandown(self): 
GPIO.setup(co2span, GPIO.OUT) 
GPIO.output(co2span, 0)   
def gpiocleanup(self): 
GPIO.cleanup() 
def closeEvent(self, event): 
print ("GPIO CleanUP")
GPIO.cleanup() 
event.accept()       
class O2_Channel(QtCore.QThread):
def __init__(self):
QtCore.QThread.__init__(self)
def O2_Channel(self):
ReadChannel(channel)
adc = spi.xfer2([1,(8+channel)<<4,0])
data = ((adc[1]&3) << 8) + adc[2]
return data
ConvertVolts(data,places)
volts = (data * 3.3) / float(1023)
volts = round(volts,places)
return volts 
def run(self):
while True:
light_level = ReadChannel(light_channel)
light_volts = ConvertVolts(light_level,2)
print "--------------------------------------------"
print("Light: {} ({}V)".format(light_level,light_volts))
light_channel = 0
temp_channel  = 1
delay = .3                         
time.sleep(delay)
self.O2_Channel.start()
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
window = MyWindow()
sys.exit(app.exec_())

您必须创建线程的实例，并使用主线程中的 start () 函数启动它。如果要在GUI中显示数据，则必须从主线程执行此操作 为此，我创建了一个插槽和一个信号，当有新读数时发出该信号。

我还更改了信号和插槽之间的连接方式，以更现代的方式。

import sys
import RPi.GPIO as GPIO
import time
import re
from PyQt4 import QtGui, uic, QtCore
from PyQt4.QtCore import QThread
import spidev
GPIO.setmode(GPIO.BCM) 
GPIO.setwarnings(False)
o2zero = 26
o2span = 19
cozero = 13
cospan = 6
co2zero = 5
co2span = 21
status = "nil"
light_channel = 0
spi = spidev.SpiDev()
spi.open(0,0)
class MyWindow(QtGui.QMainWindow): 
def __init__(self):
super(MyWindow, self).__init__()
uic.loadUi('mainwindow.ui', self)
self.o2_zero_upclicked.connect(self.o2zeroup) 
self.o2_zero_down.clicked.connect(self.o2zerodown)
self.o2_span_up.clicked.connect(self.o2spanup)
self.o2_span_down.clicked.connect(self.o2spandown)
self.co_zero_up.clicked.connect(self.cozeroup)
self.co_zero_down.clicked.connect(self.cozerodown)
self.co_span_up.clicked.connect(self.cospanup)
self.co_span_down.clicked.connect(self.cospandown)
self.co2_zero_up.clicked.connect(self.co2zeroup)
self.co2_zero_down.clicked.connect( self.co2zerodown)
self.co2_span_up.clicked.connect(self.co2spanup)
self.co2_span_down.clicked.connect(self.co2spandown)  
self.close_button.clicked.connect(self.gpiocleanup) 
self.thread = O2_Channel()
self.thread.changedValue.connect(self.onChangeValue)
self.thread.start()
self.show()
def onChangeValue(self, values):
light_level, light_volts = values
print "--------------------------------------------"
print("Light: {} ({}V)".format(light_level,light_volts))

def o2zeroup(self):  
GPIO.setup(o2zero, GPIO.OUT)   
GPIO.output(o2zero, 1) 
def o2zerodown(self): 
GPIO.setup(o2zero, GPIO.OUT) 
GPIO.output(o2zero, 0) 
def o2spanup(self):  
GPIO.setup(o2span, GPIO.OUT)  
GPIO.output(o2span, 1) 
def o2spandown(self): 
GPIO.setup(o2span, GPIO.OUT) 
GPIO.output(o2span, 0) 
def cozeroup(self):  
GPIO.setup(cozero, GPIO.OUT)  
GPIO.output(cozero, 1) 
def cozerodown(self):
GPIO.setup(cozero, GPIO.OUT)  
GPIO.output(cozero, 0) 
def cospanup(self):
GPIO.setup(cospan, GPIO.OUT)   
GPIO.output(cospan, 1) 
def cospandown(self): 
GPIO.setup(cospan, GPIO.OUT) 
GPIO.output(cospan, 0)
def co2zeroup(self):
GPIO.setup(co2zero, GPIO.OUT)   
GPIO.output(co2zero, 1) 
def co2zerodown(self): 
GPIO.setup(co2zero, GPIO.OUT) 
GPIO.output(co2zero, 0)
def co2spanup(self):
GPIO.setup(co2span, GPIO.OUT)   
GPIO.output(co2span, 1) 
def co2spandown(self): 
GPIO.setup(co2span, GPIO.OUT) 
GPIO.output(co2span, 0)   
def gpiocleanup(self): 
GPIO.cleanup() 
def closeEvent(self, event):
self.thread.stop()
self.thread.quit()
self.thread.wait()
self.thread.deleteLater() 
print ("GPIO CleanUP")
GPIO.cleanup() 
event.accept()   
def ReadChannel(channel):
adc = spi.xfer2([1,(8+channel)<<4,0])
data = ((adc[1]&3) << 8) + adc[2]
return data
def ConvertVolts(data, places):
volts = (data * 3.3) / float(1023)
volts = round(volts,places)
return volts    
class O2_Channel(QtCore.QThread):
changedValue = QtCore.pyqtSignal(tuple)
def __init__(self):
QtCore.QThread.__init__(self)
self.mRunning = True
def run(self):
while self.mRunning:
light_level = ReadChannel(light_channel)
light_volts = ConvertVolts(light_level,2)
print "--------------------------------------------"
print("Light: {} ({}V)".format(light_level,light_volts))
self.changedValue.emit((light_level, light_volts))
light_channel = 0
temp_channel  = 1
delay = .3                         
time.sleep(delay)
def stop(self):
self.mRunning = False
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
window = MyWindow()
sys.exit(app.exec_())

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