In my script, I send data by serial connection. Whenever something is executed in my script, there is a timestamp displayed in the console. When I start to send the data it should say "Send data..."
and when it is finished
"Data sent..."
My script takes the timestamp from the beginning. But unfortunately, it is only output at the end together with Data sent... That means "Send Data..." and "Data sent..." appear at the same time by the end of sending process.
Now to my question: Why is the timestamp, which is printed BEFORE the start of the serial communication, only printed afterward?
Below is a mini example with GUI. I work with PyQt5.
Script:
#SCRIPT
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import Qt
import sys
import GUI
import datetime
import serial
ser = serial.Serial(
port='/dev/serial0',
baudrate = 57600,
timeout=1
)
class my_class(QtWidgets.QMainWindow, GUI.Ui_MainWindow):
def __init__(self, parent=None):
super(my_class, self).__init__(parent)
self.setupUi(self)
self.pushButton.clicked.connect(self.push_button_pressed)
def push_button_pressed(self):
self.sendData()
def sendData(self):
self.Console.append(str(datetime.datetime.now()) + " Send Data...")
data_to_send = []
for i in range(10000):
data_to_send.append(i)
print(data_to_send)
ser.write(str(data_to_send).encode('utf-8'))
self.Console.append(str(datetime.datetime.now()) + " Data sent...")
def main():
app = QApplication(sys.argv)
form = my_class()
form.show()
app.exec_()
if __name__ == '__main__':
main()
GUI:
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(238, 191)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(80, 120, 91, 30))
self.pushButton.setObjectName("pushButton")
self.Console = QtWidgets.QTextEdit(self.centralwidget)
self.Console.setGeometry(QtCore.QRect(10, 10, 221, 101))
self.Console.setObjectName("Console")
MainWindow.setCentralWidget(self.centralwidget)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.pushButton.setText(_translate("MainWindow", "PushButton"))
