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EFI_USBFN_IO_PROTOCOL.GetEndpointMaxPacketSize

  • Artikel

The GetEndpointMaxPacketSize function returns the maximum packet size of the specified endpoint type for the supplied bus speed.

Syntax

typedef
EFI_STATUS
(EFIAPI * EFI_USBFN_IO_GET_ENDPOINT_MAXPACKET_SIZE) (
  IN EFI_USBFN_IO_PROTOCOL      *This,
  IN EFI_USB_ENDPOINT_TYPE      EndpointType,
  IN EFI_USB_BUS_SPEED          BusSpeed,
  OUT UINT16                    *MaxPacketSize
  );

Parameters

This
A pointer to the EFI_USBFN_IO_PROTOCOL instance.

EndpointType
Endpoint type as defined in the EFI_USB_ENDPOINT_TYPE. enumeration

BusSpeed
An EFI_USB_BUS_SPEED enumeration value that indicates the current bus speed as known to the caller.

MaxPacketSize
The maximum packet size, in bytes, of the specified endpoint type.

Return values

This function returns the following values:

Return code Description
EFI_SUCCESS The function returned successfully
EFI_INVALID_PARAMETER A parameter is invalid
EFI_DEVICE_ERROR The physical device reported an error.
EFI_NOT_READY The physical device is busy or not ready to process this request

Requirements

Header: User generated