It's called at the very beginning of the USBX example you suggested to use. The comment says the semaphore is used to check whether the CDC-ACM device is active. /* Wait until CDC-ACM device instance activated. */ And I placed a breakpoint in that specific instruction, but it doesn't get there... It has to be a problem in the setup instruction part I believe. I'm attaching my project as the callstack shows different outcomes in different times. (Please visit the site to view this file) Greetings, Alan.
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