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121 lines
3.0 KiB
121 lines
3.0 KiB
16 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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#include "RingBuff.h"
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void Buffer_Initialize(RingBuff_t* Buffer)
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{
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BUFF_ATOMIC_BLOCK
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{
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Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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Buffer->Elements = 0;
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}
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}
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void Buffer_StoreElement(RingBuff_t* Buffer, RingBuff_Data_t Data)
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{
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BUFF_ATOMIC_BLOCK
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{
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#if defined(BUFF_DROPOLD)
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if (Buffer->Elements == BUFF_LENGTH)
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{
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Buffer->OutPtr++;
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if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
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Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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}
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else
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{
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Buffer->Elements++;
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}
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#elif defined(BUFF_DROPNEW)
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if (Buffer->Elements == BUFF_LENGTH)
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return;
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Buffer->Elements++;
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#elif defined(BUFF_NODROPCHECK)
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Buffer->Elements++;
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#endif
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*(Buffer->InPtr) = Data;
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Buffer->InPtr++;
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if (Buffer->InPtr == &Buffer->Buffer[BUFF_LENGTH])
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Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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}
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}
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RingBuff_Data_t Buffer_GetElement(RingBuff_t* Buffer)
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{
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RingBuff_Data_t BuffData;
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BUFF_ATOMIC_BLOCK
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{
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#if defined(BUFF_EMPTYRETURNSZERO)
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if (!(Buffer->Elements))
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return 0;
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#elif !defined(BUFF_NOEMPTYCHECK)
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#error No empty buffer check behaviour specified.
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#endif
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BuffData = *(Buffer->OutPtr);
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Buffer->OutPtr++;
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Buffer->Elements--;
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if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
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Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
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}
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return BuffData;
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}
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#if defined(BUFF_USEPEEK)
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RingBuff_Data_t Buffer_PeekElement(const RingBuff_t* Buffer)
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{
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RingBuff_Data_t BuffData;
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BUFF_ATOMIC_BLOCK
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{
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#if defined(BUFF_EMPTYRETURNSZERO)
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if (!(Buffer->Elements))
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return 0;
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#elif !defined(BUFF_NOEMPTYCHECK)
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#error No empty buffer check behaviour specified.
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#endif
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BuffData = *(Buffer->OutPtr);
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}
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return BuffData;
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}
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#endif
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