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88 lines
3.4 KiB
88 lines
3.4 KiB
17 years ago
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Macros and enums for the stream callback routines in Endpoint.h and Pipe.c. This module contains the
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* code required to easily set up stream callback functions which can be used to force early abort of a
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* stream read/write process.
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*/
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#ifndef __STREAMCALLBACK_H__
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#define __STREAMCALLBACK_H__
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Creates a prototype for or begins a stream callback routine. Stream callback routines are small
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* routines which are executed during stream read or writes (if the callback-enabled versions of
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* these functions are used) which allow the user application to abort the transfer when certain
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* arbitrary conditions are met.
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*
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* Stream callback functions should return a value from the StreamCallback_Return_ErrorCodes_t
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* enum.
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*
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* Usage Example (Device Endpoint, but applicable for Host pipes also):
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* \code
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* STREAM_CALLBACK(GlobalNotSet); // Callback Prototype
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*
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* STREAM_CALLBACK(GlobalNotSet)
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* {
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* if (MyGlobal == false)
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* return ENDPOINT_STREAMCALLBACK_Continue;
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* else
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* return ENDPOINT_STREAMCALLBACK_Abort;
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* }
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*
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* //...
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* // Inside some routine:
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* if (Endpoint_Write_CStream_LE(DataBuffer, sizeof(DataBuffer), GlobalNotSet) ==
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* ENDPOINT_RWSTREAM_ERROR_CallbackAborted)
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* {
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* // Do something when the callback aborted the transfer early
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* }
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* \endcode
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*/
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#define STREAM_CALLBACK(name) uint8_t name (void)
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/** Used with the Endpoint and Pipe stream functions as the callback function parameter, indicating that the stream
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* call has no callback function to be called between USB packets.
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*/
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#define NO_STREAM_CALLBACK NULL
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/* Enums: */
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/** Enum for the possible error return codes of a stream callback function */
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enum StreamCallback_Return_ErrorCodes_t
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{
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STREAMCALLBACK_Continue = 0, /**< Continue sending or receiving the stream. */
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STREAMCALLBACK_Abort = 1, /**< Abort the stream send or reciving process. */
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};
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#endif
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