I am trying to make communication between my micro-controller and my Qt application...

what i want to do is to read the data sent in from the micro-controller(connected via USB cable) and to sent data back to it as well..

i understand i need to make a serial communication which is done through the RX & TX pins of the uC and there would be a converter which then gives the signal to the D+ & D- of the USB cable...

Pls correct me if i am wrong...

I did search some sites and found that i need "QtextSerialPort" library... but is this the same thing that i need even when i am using the USB cable..
also if i need this library file... i dont know how to add them...

Please help me out in this one...its urgent...