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Chapter 4
4
In order to have independent configuration for clock gating, interrupt controller and general
purpose I/O, a USB device controller driver needs an additional file. This file is called a
Board Support Package (BSP). The name of this file is usbd_bsp_<controller>.c . This file
contains all the details that are closely related to the hardware on which the product is used.
This file also defines the endpoints information table. This table is used by the core layer to
allocate endpoints according to the hardware capabilities.
4-1-8 CPU LAYER
μC/USB-Device can work with either an 8, 16, 32 or even 64-bit CPU, but it must have
information about the CPU used. The CPU layer defines such information as the C data type
corresponding to 16-bit and 32-bit variables, whether the CPU has little or big endian
memory organization, and how interrupts are disabled and enabled on the CPU.
CPU-specific files are found in the \uC-CPU directory and are used to adapt μC/USB-Device
to a different CPU.
4-2 TASK MODEL
μC/USB-Device requires two tasks: One core task and one optional task for tracing debug
events. The core task has three main responsibilities:
■
Process USB bus events: Bus events such as reset, suspend, connect and disconnect are
processed by the core task. Based on the type of bus event, the core task sets the state
of the device.
■
Process USB requests: USB requests are sent by the host using the default control
endpoint. The core task processes all USB requests. Some requests are handled by the
USB class driver, for those requests the core calls the class-specific request handler.
■
Process I/O asynchronous transfers: Asynchronous I/O transfers are handled by the
core. Under completion, the core task invokes the respective callback for the transfer.
Figure 4-2 shows a simplified task model of μC/USB-Device along with application tasks.
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