Collapse all Symbian^3 Application Developer Library

RUsbTransferDescriptor Class Reference

class RUsbTransferDescriptor

Base class for all transfer descriptors.

Intended to be available to 3rd parties later

Public Member Functions
void	Close ()

Protected Member Functions
	RUsbTransferDescriptor ( TTransferType , TInt , TInt )

Public Member Enumerations
enum	TTransferType { EBulk , EIsochronous , EInterrupt }
enum	TZlpStatus { ESuppressZlp , ESendZlpIfRequired , EAlwaysSendZlp }

Public Attributes
const TInt	iMaxNumPackets
const TInt	iMaxSize
const TTransferType	iType

Protected Attributes
const TInt	KInvalidHandle
TInt	iHandle
RUsbTransferStrategy *	iTransferStrategy

Constructor & Destructor Documentation

RUsbTransferDescriptor(TTransferType, TInt, TInt)

RUsbTransferDescriptor	(	TTransferType	aType,
		TInt	aMaxSize,
		TInt	aMaxNumPackets
	)	[protected]

Constructor protected to as this class is only intended as a base class.

Parameters

TTransferType aType
TInt aMaxSize
TInt aMaxNumPackets

Member Functions Documentation

Close()

void

(

)

[virtual]

Releases resources allocated to this transfer descriptor.

Member Enumerations Documentation

Enum TTransferType

Enumerators

EBulk
EIsochronous
EInterrupt

Enum TZlpStatus

Enumerators

ESuppressZlp
ESendZlpIfRequired
EAlwaysSendZlp

Member Data Documentation

const TInt KInvalidHandle

const TInt

KInvalidHandle

[protected, static]

TInt iHandle

TInt

iHandle

[protected]

Handle into the transfer strategy for the descriptor.

const TInt iMaxNumPackets

const TInt

iMaxNumPackets

Used to specify the maximum number of packets the descriptor will hold.

const TInt iMaxSize

const TInt

iMaxSize

For isochronous transfers this refers to the maximum packet size packets in this descriptor may be. For other transfers this refers to the maximum size of the transfer.

RUsbTransferStrategy * iTransferStrategy

RUsbTransferStrategy *

iTransferStrategy

[protected]

A pointer to the transfer strategy the descriptor is registered in.

const TTransferType iType

const TTransferType

iType

The type of transfer descriptor this instance represents.