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USB programming concept

hello ,
i am very new to usb program,i just read only usb doc for stm32f103xx controller but i didnt get anything.could you please guide me how to learn usb virtual com port programm and what are the things we needto have(like hardware and softwares). i also dowloaded the virtual comport drivers but my board is not detecting.
please try to help me.its very important to me
thanks in advance

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