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Cypress Releases USB Driver For Wind River's VxWorks Embedded Operating System

Request Permissions. TRBs begin with a common header that may be followed by parameters vxworks usb to the function being requested. Function Code See Page. The tcdParam element points to the TCD-defined parameters structure that the application in the configlette passes to usbTargTcdAttach see 5. The interrupt service routine of the TCD calls this routine, passing it the usbHalIsrParam, whenever an interrupt event occurs. During the TCD attachment process, the TCD sets the registers of the target controller with the appropriate values to initialize the target controller.

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The TRB, shown below, is used for this purpose. This function is typically requested only if the target application is in the process vxworks usb shutting down. Both of these function codes share the same TRB.

Cypress Releases USB Driver For Wind River's VxWorks Embedded Operating System

The uFeatureSelector element specifies the remote wakeup feature or the test mode feature see Table for a list vxworks usb feature selector values. The uTestSelector element specifies the test selector values see Table for a list of test selector values. This function allows a client to query a reference frame number maintained by the device indicated by frameNo. Refer to the USB 2. Before any data is transferred to or from the endpoints, the endpoints must be created.

The target layer creates the control endpoints during the bus reset process. The target application creates the generic endpoints during the enumeration process from the host. The target application always creates the endpoints corresponding to the endpoint numbers that the HAL receives from the target layer in the endpoint descriptor see Endpoint Descriptor, p. NOTE: The creation of generic pipes depends entirely on the target application. The HAL uses this handle for any subsequent request through that pipe. Vxworks usb target application sets the endpoint descriptor, pEndpointDesc; see Endpoint Descriptor, p.

In response to this function call, the TCD releases the endpoint and removes the pipe referenced by pipeHandle.

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The TCD returns the status of the endpoint vxworks usb Table for a list of valid status values and their meanings. Vxworks usb the pipes are created, they may be used to transfer data see 5. The pipeHandle element refers to the endpoint to whose or from whose FIFO buffer the data is to be copied. The data is copied to or from the pBuffer.

However, the actual amount of data 6 transmitted through the TCD may be different, depending on the maximum packet size for the endpoint. If the TCD vxworks usb a different amount of vxworks usb from that indicated by uActLength, the TCD overwrites uActLength with the actual amount of data that was transferred before returning from its single entry point. This element is a bitmap with the following form:.

It uses the same bitmap format to indicate which vxworks usb to clear. Figure illustrates how interrupts are handled:.

Interrupt generated. Calls the appropriate entry point in the target application, if required. These errors are defined in usbTcd. When disconnect, suspend, resume, and reset events happen, some hardware may have to handle the events by doing something specific to its register set. On a disconnect, for example, some target controllers expect some registers to be reset—this can be done in the disconnect interrupt handler. USB peripheral stack initialization starts with the initialization of the target controllers. The following routines provide data lengths such eight- and bit, for accessing the target controller registers of varying data widths. Interrupt Routines 7. The following routines vxworks usb used to connect and disconnect the ISR with the corresponding interrupts.

For example, if you are implementing a new device driver, you can use usbTool to exercise and debug your code.

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The usbTool utility also provides a basic code skeleton that you can customize to suit your test needs. A OUT endpoint. The peripheral stack is the software on the USB peripheral that interprets and responds to the commands sent by the USB host. A pipe is a logical abstraction representing the association between an endpoint on a device and the software on the host. A pipe has several attributes. For example, a pipe may transfer data as streams stream pipe or as messages vxworks usb pipe.

A pipe handle is used by the target application when it carries out USB transfer on an endpoint.It explains how to use the Wind River USB peripheral stack to create new vxworks usb applications and target controller drivers. This manual assumes.


Course Overview. This course provides engineers with a methodology they can use to load and boot VxWorks from a Vxworks usb stick on a target board with an Intel.

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