EVT_UDECX_USB_ENDPOINT_START callback function (udecxusbendpoint.h)

The USB device emulation class extension (UdeCx) invokes this callback function to start processing I/O requests on the specified endpoint of the virtual USB device.

Syntax

EVT_UDECX_USB_ENDPOINT_START EvtUdecxUsbEndpointStart;

VOID EvtUdecxUsbEndpointStart(
  [in] UDECXUSBENDPOINT UdecxUsbEndpoint
)
{...}

Parameters

[in] UdecxUsbEndpoint

A handle to a UDE endpoint object that represents the endpoint which can start receiving I/O requests. The client driver retrieved this pointer in the previous call to UdecxUsbEndpointCreate.

Return value

None

Remarks

The client driver registered this callback function in a previous call to UdecxUsbEndpointInitSetCallbacks by supplying a function pointer to its implementation.

After the client driver creates an endpoint, it does not automatically start receiving I/O requests. When UdeCx is ready to forward those request for processing, it invokes the client driver's EVT_UDECX_USB_ENDPOINT_START function and the client driver can begin processing I/O on the endpoint’s queue, and on any queues that receive forwarded I/O for the endpoint. This callback returns the endpoint to a state of processing I/O after an EVT_UDECX_USB_ENDPOINT_PURGE callback has and completed.

Requirements

See also

Architecture: USB Device Emulation (UDE)

EVT_UDECX_USB_ENDPOINT_PURGE

Managing I/O Queues

Write a UDE client driver