Re: Problem with two instances of PySerial
On Thu, 9 Jul 2009 08:40:18 -0500, Shine Jose shinejos...@gmail.com wrote: I achieve this by creating a separate worker thread to poll the serial port for arrival of data and then updating the required widget in main thread of program. For polling the serial port, I create a separate instance of pySerial object. However, I am unable to read any data in the worker thread. Can the reason for this be 2 instances of pySerial objects being connected to serial port. Yes. The reason I had this doubt was because Serial.Connect() in the worker thread did not throw any exception isOpen() method returns true. Under Unix, you are allowed to open a device or file as many times as you want (there are some common cases where there is a very useful thing to do). However, for something like a serial port, there's only one copy of each received data byte. Depending on exactly how you structure your code, the incoming data may be divided up amongst multiple readers, or one particular reader may get all of it. -- Grant Edwards grante Yow! I joined scientology at at a garage sale!! visi.com -- http://mail.python.org/mailman/listinfo/python-list
Problem with two instances of PySerial
Hello friends,I am developing an application to read data from serial port and display it on the screen using GUI developed in pyQT. For this I have instantiated the GUI as well as pySerial objects in the main thread. I have provided a button 'Read' which when clicked by the user reads from the serial port using read() method of pySerial. However, for debugging purposes I also want to poll the serial port continuously for arrival of data and display on screen. I achieve this by creating a separate worker thread to poll the serial port for arrival of data and then updating the required widget in main thread of program. For polling the serial port, I create a separate instance of pySerial object. However, I am unable to read any data in the worker thread. Can the reason for this be 2 instances of pySerial objects being connected to serial port. The reason I had this doubt was because Serial.Connect() in the worker thread did not throw any exception isOpen() method returns true. I request you to help me in figuring out the problem. -- Regards, Shine Jose -- http://mail.python.org/mailman/listinfo/python-list
