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Chapter 14
14-3 CORE LAYER RTOS MODEL
The core layer of μC/USB-Device needs an RTOS for three purposes:
■
Signal the completion of synchronous transfers.
■
Manage core events.
■
Manage debug events (optional).
14
14-3-1 SYNCHRONOUS TRANSFER COMPLETION SIGNALS
The core layer needs a way to signal the application about the synchronous transfer
completion. The core will need one signal per endpoint. The RTOS resources usually used
for this signal is a semaphore. Figure 14-2 describes a synchronous transfer completion
notification.
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Figure 14-2 Synchronous transfer completion notification
F14-2(1)
Application task calls a synchronous transfer function.
F14-2(2)
While the transfer is in progress, the application task pends on the transfer
completion signal.
F14-2(3)
Once the transfer is completed, the core will post the transfer completion signal
which will resume the application task.
240
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