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Chapter 14
14-1 OVERVIEW
μC/USB-Device uses some RTOS abstraction ports to interact with the RTOS. Instead of
being a simple wrapper for common RTOS service functions ( TaskCreate() ,
SemaphorePost() , etc...), those ports are in charge of allocating and managing all the OS
resources needed. All the APIs are related to the μC/USB-Device module feature that uses it.
This offers you a better flexibility of implementation as you can decide which OS services
can be used for each specific action. Table 14-1 gives an example of comparison between a
simple RTOS functions wrapper port and a features-oriented RTOS port.
14
Operation
Example of feature-oriented function
(current implementation)
Equivalent function in a simple wrapper
(not used)
Create a task
Create a signal
for an endpoint
Put a core event
in a queue
The stack is not in charge of creating tasks.
This should be done in the RTOS
abstraction layer within a USBD_OS_Init()
function, for example.
USBD_OS_EP_SignalCreate() . You are free
to use another OS service than a typical
Semaphore.
USBD_OS_CoreEventPut() . If you prefer not
using typical OS queues, you could still
USBD_OS_TaskCreate() . The stack would need
to explicitly create the needed tasks and to
manage them.
USBD_OS_SemCreate() . The stack would need
to explicitly choose the OS service to use.
USBD_OS_Q_Post() . Again, the stack would
need to explicitly choose the OS service to use.
implement it using a chained list and a
semaphore, for instance.
Table 14-1 Comparison between a wrapper and a features-oriented RTOS port
Because of the features oriented RTOS port design, some μC/USB-Device modules will
need their own OS port. These modules are listed here:
■
μC/USB-Device core layer
■
Personal Healthcare Device Class (PHDC)
■
Human Interface Device Class (HID)
■
Mass Storage Class (MSC)
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