Bidirectional endpoints (USB)

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Hi all,

I am confused as to what "bidirectional endpoint" in USB module means. Is it

(a) an endpoint that acts as IN and OUT endpoint at the same time;

or
(b) an endpoint that can be configured as either IN or OUT endpoint?


It looks to me like it's the latter case, but can anybody confirm that for me, please?

Thanks so much!

Andrey
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