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120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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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 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all 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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* Ultra lightweight ring buffer, for fast insertion/deletion.
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*/
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#ifndef _ULW_RING_BUFF_H_
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#define _ULW_RING_BUFF_H_
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/* Includes: */
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#include <util/atomic.h>
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#include <stdint.h>
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#include <stdbool.h>
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/* Defines: */
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/** Size of each ring buffer, in data elements - must be between 1 and 255. */
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#define BUFFER_SIZE 128
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/** Type of data to store into the buffer. */
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#define RingBuff_Data_t uint8_t
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/* Type Defines: */
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/** Type define for a new ring buffer object. Buffers should be initialized via a call to
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* \ref RingBuffer_InitBuffer() before use.
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*/
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typedef struct
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{
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RingBuff_Data_t Buffer[BUFFER_SIZE]; /**< Internal ring buffer data, referenced by the buffer pointers. */
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RingBuff_Data_t* In; /**< Current storage location in the circular buffer */
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RingBuff_Data_t* Out; /**< Current retrieval location in the circular buffer */
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uint8_t Count; /**< Total number of bytes stored in the circular buffer */
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} RingBuff_t;
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/* Inline Functions: */
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/** Initializes a ring buffer ready for use. Buffers must be initialized via this function
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* before any operations are called upon them. Already initialized buffers may be reset
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* by re-initializing them using this function.
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*
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* \ref Buffer Pointer to a ring buffer structure to initialize
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*/
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static inline void RingBuffer_InitBuffer(RingBuff_t* const Buffer)
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{
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Buffer->In = Buffer->Buffer;
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Buffer->Out = Buffer->Buffer;
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Buffer->Count = 0;
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}
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/** Inserts an element into the ring buffer.
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*
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* \ref Buffer Pointer to a ring buffer structure to insert into
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* \ref Data Data element to insert into the buffer
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*/
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static inline void RingBuffer_Insert(RingBuff_t* const Buffer, RingBuff_Data_t Data)
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{
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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*Buffer->In = Data;
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if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
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Buffer->In = Buffer->Buffer;
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Buffer->Count++;
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}
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}
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/** Retrieves an element from the ring buffer.
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*
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* \ref Buffer Pointer to a ring buffer structure to retrieve from
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*
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* \return Next data element stored in the buffer
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*/
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static inline RingBuff_Data_t RingBuffer_Remove(RingBuff_t* const Buffer)
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{
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RingBuff_Data_t Data;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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Data = *Buffer->Out;
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if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
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Buffer->Out = Buffer->Buffer;
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Buffer->Count--;
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}
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return Data;
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}
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#endif
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