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Modules Relationship
4
4-1-6 REAL-TIME OPERATING SYSTEM (RTOS) ABSTRACTION
LAYER
μC/USB-Device assumes the presence of a RTOS, and a RTOS abstraction layer allows μC/
USB-Device to be independent of a specific RTOS. The RTOS abstraction layer is composed
of several RTOS ports, a core layer port and some class layer ports.
CORE LAYER PORT
At the very least, the RTOS for the core layer:
■
Create at least one task for the core operation and one optional task for the debug trace
feature.
■
Provide semaphore management (or the equivalent). Semaphores are used to signal
completion or error in synchronous I/O operations and trace events.
■
Provide queue management for I/O and bus events.
μC/USB-Device is provided with ports for μC/OS-II and μC/OS-III. If a different RTOS is
used, you can use the files for μC/OS-II or μC/OS-III as template to interface to the RTOS
chosen. For more information on how to port μC/USB-Device to a RTOS, see Chapter 14,
“Porting μC/USB-Device to your RTOS” on page 237.
CLASS LAYER PORTS
Some classes requires a RTOS port (i.e., MSC, PHDC and HID). Refer to Table 14-2 on
page 239 for a list of sections containing more informations on the RTOS port of each of
these classes.
4-1-7 HARDWARE ABSTRACTION LAYER
μC/USB-Device works with nearly any USB device controller. This layer handles the
specifics of the hardware, e.g., how to initialize the device, how to open and configure
endpoints, how to start reception and transmission of USB packets, how to read and write
USB packets, how to report USB events to the core, etc. The USB device driver controller
functions are encapsulated and implemented in the usbd_drv_<controller>.c file.
57
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