Martin Due
To import USB function to a SDK project, you need :
1. import USB related driver with "manage SDK components"

for example, you want to import USB device drivers, add "USB device" middleware (USB common will automatically be selected). Thus you get all the related USB device related driver added to your project.

2. the next step is to refer related USB device application demo under SDK folder, add application source code to your own project.
For new user, I would suggest you follow above steps and SDK CDC demo code to add CDC device application to a hello world demo for test purpose. It's not difficult.
Have a great day,
Jun Zhang
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