USB interface descriptor RRS feed

  • Question

  • I was taking a look at USB descriptors. The USB spec says that

    "An interface descriptor contains information about an alternate setting of a USB interface. ".

    1. Does this mean that an interface descriptor should always belong to an alternate setting? Should all USB devices contain one or more alternate setting?  If a device doesn't have any alternate settings, then how is the interface(s) of that device configured?

    2. Should an end point under an interface always belong to an alternate setting?

    Friday, March 28, 2014 3:03 PM