Sounds like you have a completely wrong conception about the USB. You can
not use it as a "Port" of any kind. This is like you say that you want to
talk to your Ethernet port or your PCI.
You can only talk to a device connected to the USB. If there is a device
that handles USB to serial conversin then likely it already comes with
the necessary drivers.
>I want to expose the USB Port as a Virtual COM Port (serial port). My
>objective is to write a driver that exposes the USB Port as a COM port
>so that the applications can access the device using serial I/O APIs.
>How to do this? Any idea/document/sample source code will be much
>useful.
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