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98 lines
3.3 KiB
98 lines
3.3 KiB
8 years ago
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2010 Denver Gingerich (denver [at] ossguy [dot] com)
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Copyright 2017 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 disclaims 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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* Header file for CircularBitBuffer.c.
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*/
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#ifndef _CIRCULARBITBUFFER_H_
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#define _CIRCULARBITBUFFER_H_
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/* Includes: */
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#include <avr/io.h>
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#include <stdbool.h>
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#include <LUFA/Common/Common.h>
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/* Macros: */
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#if (defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
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defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__)) || defined(__DOXYGEN__)
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/** Maximum number of bits which can be stored into a bit buffer. The memory usage is one eighth of this value per buffer. */
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#define MAX_BITS 8192
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#else
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#define MAX_BITS 1024
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#endif
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/* Type Defines: */
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/** Type define for a pointer to a bit in a bit buffer. */
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typedef struct
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{
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uint8_t* CurrentByte; /**< Pointer to the current byte in the buffer */
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uint8_t ByteMask; /**< Mask of the current bit in the buffer */
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} BitBufferPointer_t;
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/** Type define for a circular packet bit buffer. */
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typedef struct
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{
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uint8_t Data[MAX_BITS / 8]; /**< Buffer to hold the stored bits in packed form */
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uint16_t Elements; /**< Number of stored bits in the bit buffer */
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BitBufferPointer_t In; /**< Bit pointer to the next storage location in the buffer */
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BitBufferPointer_t Out; /**< Bit pointer to the next retrieval location in the buffer */
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} BitBuffer_t;
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/* Function Prototypes: */
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/** Initializes or resets a given bit buffer, ready to store new bits.
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*
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* \param[in,out] Buffer Bit buffer to initialize
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*/
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void BitBuffer_Init(BitBuffer_t* const Buffer) ATTR_NON_NULL_PTR_ARG(1);
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/** Stores a bit into the next location inside a given bit buffer.
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*
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* \param[in,out] Buffer Bit buffer to store a bit into
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* \param[in] Bit Bit to store into the buffer
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*/
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void BitBuffer_StoreNextBit(BitBuffer_t* const Buffer,
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const bool Bit) ATTR_NON_NULL_PTR_ARG(1);
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/** Retrieves a bit from the next location inside a given bit buffer.
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*
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* \param[in,out] Buffer Bit buffer to retrieve a bit from
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*
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* \return Next bit from the buffer
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*/
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bool BitBuffer_GetNextBit(BitBuffer_t* const Buffer) ATTR_NON_NULL_PTR_ARG(1);
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#endif
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