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Chapter 9
9-5 PORTING THE HID CLASS TO A RTOS
The HID class uses its own RTOS layer for different purposes:
9
■
A locking system is used to protect a given Input report. A host can get an Input report
by sending a GET_REPORT request to the device using the control endpoint or with an
interrupt IN transfer. GET_REPORT request processing is done by the device stack while
the interrupt IN transfer is done by the application. When the application executes the
interrupt IN transfer, the Input report data is stored internally. This report data stored
will be sent via a control transfer when GET_REPORT is received. The locking system
ensures the data integrity between the Input report data storage operation done within
an application task context and the GET_REPORT request processing done within the
device stack’s internal task context.
■
A locking system is used to protect the Output report processing between an
application task and the device stack’s internal task when the control endpoint is used.
The application provides to the HID class a receive buffer for the Output report in the
application task context. This receive buffer will be used by the device stack’s internal
task upon reception of a SET_REPORT request. The locking system ensures the receive
buffer and related variables integrity.
■
A locking system is used to protect the interrupt IN endpoint access from multiple
application tasks.
■
A synchronization mechanism is used to implement the blocking behavior of
USBD_HID_Rd() when the control endpoint is used.
■
A synchronization mechanism is used to implement the blocking behavior of
USBD_HID_Wr() because the HID class internally uses the asynchronous interrupt API
for HID write.
■
A task is used to process periodic Input reports. Refer to section 9-6 “Periodic Input
Reports Task” on page 161 for more details about this task.
By default, Micriμm will provide an RTOS layer for both μC/OS-II and μC/OS-III. However,
it is possible to create your own RTOS layer. Your layer will need to implement the
functions listed in Table 9-9. For a complete API description, refer to Appendix D, “HID API
Reference” on page 387.
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