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Chapter 7
If a high-speed host enumerates this device, by default, the device will work in high-speed
7
mode and thus the high-speed configuration will be active. The host can learn about the
full-speed capabilities by getting a Device_Qualifier descriptor followed by an
Other_Speed_Configuration descriptor. These two descriptors describe a configuration of a
high-speed capable device if it were operating at its other possible speed (refer to Universal
Serial Bus 2.0 Specification revision 2.0, section 9.6, for more details about these
descriptors). In our example, the host may want to reset and enumerate the device again in
full-speed mode. In this case, the full-speed configuration is active. Whatever the active
configuration, the same class instance is used. Indeed, the same class instance can be added
to different configurations. A class instance cannot be added several times to the same
configuration.
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Figure 7-2 Multiple Class Instances - HS/FS Device (2 Configurations and 1 Single Interface)
The code corresponding to Figure 7-2 is shown in Listing 7-2.
102
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