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Function RTUAltInterfaces

RTUAltInterfaces returns the number of interface descriptors (as opposed to the number of interfaces) contained in a configuration:

int RTUAltInterfaces(const RTUConfigurationDescriptor * Config);

Parameters

Config

Pointer to a configuration descriptor to query.

return value

Number of interface descriptors available in *Config.

Because interfaces can have alternate settings, several interface descriptors can exist for each interface. This function determines the total number of interface descriptors. The number of interfaces is contained in member bNumInterfaces of the configuration descriptor. The actual interface descriptors can be retrieved using function RTUGetInterface.

Further details about the interfaces and alternate settings are given in the USB specification.

Device Query

Function RTUGetConfiguration

Function RTUGetInterface