I am not sure either, but you could use the driver from the 3rd party driver suite, which you can download here: [LINK
]. There is an example program there that will show you how to use it. The program is called "HTAC-test1.c" and is included in the driver's zip file. There is also documentation on how the API works, which you can find in the html folder. Just open "index.html" in your browser.
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| ROBOTC 3rd Party Driver Suite: [Project Page