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USB host library architecture and file organization
2
USB host library architecture and file organization
2.1
USB host library architecture
Figure 2 shows an overview of the library architecture.
Figure 2. USB host library architecture
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As seen in Figure 2, the USB host library is organized into two main parts: the core and the
class drivers.
The host core handles the core services of the library which are mainly used for the
following:
•
Device connection/disconnection management and standard enumeration,
•
Host pipes control and USB transfer management (control, interrupt, bulk,
isochronous).
The core block can be schematically subdivided into two main sub-blocks:
•
The core APIs which are called from the user application or from a class driver,
•
The core process which handles the host state machine.
The class drivers are used for the implementation of the various USB classes.
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