This problem can be avoided with the timeout0 option when enitializing the Serial object, which will cause it to return nothing unless something is already waiting in the Serial objects buffer. If you are running your own infinite loop anywhere in the code, the GUI will freeze up.īoth methods achieve basically the same goal of updating the GUI.įor example, a Serial.readline() wont print anything until there is a whole line to return, which in some cases might be never Even using the after() and update() methods will still not allow the UI to be updated in this case, since the function never ends. It needs the things in there to run every now and then in order to make the interface respond to interactions. Keep in mind that when TkInter gets to the root.mainloop() method, it is running its own while loop. The process cannot update buttons or react to input because it is busy waiting for the serial to say something. Python Twisted Serial Port Example Update Buttons Or serialstring '' used to hold data coming over uart while (1): wait until there is data waiting in the serial buffer if (serialport.inwaiting > 0): read data out of the buffer until a carraige return / new line is found serialstring serialport. import serial ser serial.Serial (0) open first serial port print ser.portstr check which port was really used ser.write ('hello') write a string ser. However, waiting for input from pySerials Serial object is blocking, which means that it will prevent your GUI from being responsive. We will install the python-twisted framework and review a quick example to exchange messages between Arduino and the. Python Twisted Serial Port Example Update Buttons Or.
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