import sys
from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, QTextEdit
from PyQt5.QtGui import QIcon, QFont
from PyQt5.QtSerialPort import QSerialPort
from PyQt5.QtCore import QIODevice

class App(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title='Hello, Joystick!'
        self.left=1555
        self.top=900
        self.width=350
        self.height=100

        # open the serial port
        self.m_serial = QSerialPort(self)
        self.m_serial.setPortName('COM3')
        if self.m_serial.open(QIODevice.ReadOnly):
            self.m_serial.setBaudRate(115200)
            self.m_serial.readyRead.connect(self.on_serial_read)
            #self.connect(m_serial, &QSerialPort::readyRead, this, &MainWindow::readData) # need check
            # Send a Control-C
            #self.serial.write(b'\x03')
        else:
            raise IOError("Cannot connect to device on port")
        
        self.initUI()
        
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left,self.top,self.width,self.height)
        self.textbox=QTextEdit(self)
        self.textbox.move(30,30)
        self.textbox.resize(280,40)
        self.show()

    #def __del__(self):
        #self.m_serial.close()

    def on_serial_read(self):
        #bytes(self.serial.readAll())
        try:
            s = self.m_serial.readAll()
            #print (s)
            if (len(s) > 0):
                axis =  s.split(',')
                if (len(axis) == 2):
                    xval = int(axis[0])
                    yval = int(axis[1])
                    #print(str(xval) + " " + str(yval))
                    self.textbox.setText(str(xval) + " " + str(yval))
        except:
            pass


if __name__=='__main__':
        app=QApplication(sys.argv)
        ex=App()
        sys.exit(app.exec_())