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Chapter 14
the core task described in Section 14-3-2. The difference is that the RTOS port does not
need to manage the queue, as it is handled within the core layer. The RTOS port only needs
to provide a signal that will inform of a debug event insertion.
14-4 PORTING THE CORE LAYER TO A RTOS
The core RTOS port is located in a separate file named usbd_os.c . A template file can be
found in the following folder:
14
\Micrium\Software\uC-USB-Device-V4\OS\Template
Table 14-3 summarizes all the functions that need to be implemented in the RTOS port file.
For more information on how these functions should be implemented, refer to section 14-3
on page 240 and to section A-5 “Core OS Functions” on page 298.
Function name
USBD_OS_Init()
USBD_OS_EP_SignalCreate()
USBD_OS_EP_SignalDel()
USBD_OS_EP_SignalPend()
USBD_OS_EP_SignalAbort()
USBD_OS_EP_SignalPost()
USBD_OS_DbgEventRdy()
USBD_OS_DbgEventWait()
USBD_OS_CoreEventGet()
USBD_OS_CoreEventPut()
Operation
Initializes all internal members / tasks.
Creates OS signal used to synchronize synchronous transfers.
Deletes OS signal used to synchronize synchronous transfers.
Pends on OS signal used to synchronize synchronous transfers.
Aborts OS signal used to synchronize synchronous transfers.
Posts OS signal used to synchronize synchronous transfers.
Posts signal used to resume debug task.
Pends on signal used to resume debug task.
Retrieves the next core event to process.
Adds a core event to be processed by the core.
Table 14-3 Core OS port API summary
Note that you must declare at least one task for the core events management within your
RTOS port. This task should simply call the core function USBD_CoreTaskHandler() in an
infinite loop. Furthermore, if you plan using the debugging feature, you must also create a
242
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