Posted on May 16, 2013 at 18:03You appear to have a whole heap of unknowns and lack of experience, many of these are complex and not learned by snapping ones fingers. If you try an all-at-once approach the learning curve is going to be VERY steep.
The VCP examples in the USB FW library would be one place to start. You should familiarize yourself with these. How they build, how they load, and the drivers on the PC side. They target the EVAL series boards, if you don't have one of these then you'll need to port the code to the DISCOVERY boards. This will require some knowledge of the tool chain, software dev work, and editing, modifying and porting to a board where the hardware differs slightly. The key place to start is removing the LCD support code, and other extraneous hardware support for stuff that's NOT on the DISCOVERY boards, and secondarily changing any PIN and PERIPHERAL differences between the boards. Yes, this will require study and work to do, but is the staple of embedded dev work.
On the PC side, building a Windows App is a whole skill set in and of itself. What experience do you bring to this? I know people with years of experience who can't do this well, and others who can bodge up examples in VB or JAVA.
Serial is relatively easy to pull off. There might be an easy way with a HID too, but I'm not too up on that. Attaching hardware, and building drivers, is rather a cluster in my experience, so best use things and interfaces which already exist and are simple.
