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Core Layer RTOS Model
14-3-2 CORE EVENTS MANAGEMENT
For proper operation, the core layer needs an OS task that will manage the core events. For
more information on the purpose of this task or on what a core event is, refer to section 4-2
“Task Model” on page 58. The core events must be queued in a data structure and be
processed by the core. This allows the core to process the events in a task context instead
of in an ISR context, as most of the events will be raised by the device driver’s ISR. The core
task also needs to be informed when a new event is queued. Figure 14-3 describes the core
events management within the RTOS port.
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Figure 14-3 Core events management within RTOS port
F14-3(1)
A core event is added to the queue.
F14-3(2)
The core task of the core layer pends on the queue. Whenever an event is
added, the core task is resumed to process it.
14-3-3 DEBUG EVENTS MANAGEMENT
The core layer of μC/USB-Device offers an optional feature to do tracing and debugging.
For more information on this feature, see Chapter 13, “Debug and Trace” on page 231. This
feature requires an OS task. For more information on the purpose of this task or on debug
events, refer to section 4-2 “Task Model” on page 58. The behavior of this task is similar to
241
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