Description, Status code returned – Intel Extensible Firmware Interface User Manual

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Protocols

— USB Support

Version 1.10

12/01/02

14-53

Description

This is an asynchronous type of USB isochronous transfer. If the caller submits a USB isochronous
transfer request through this function, this function will return immediately. When the isochronous
transfer completes, the

IsochronousCallback()

function will be triggered, the caller can

know the transfer results. If the transfer is successful, the caller can get the data received or sent in
this callback function.

Status Code Returned

EFI_SUCCESS

The asynchronous isochronous transfer has been successfully submitted

to the system.

EFI_INVALID_PARAMETER

The parameter

DeviceEndpoint

is not valid.

EFI_OUT_OF_RESOURCES

The request could not be submitted due to a lack of resources.