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+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2017.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2010 Denver Gingerich (denver [at] ossguy [dot] com)
+ Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaims all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Header file for CircularBitBuffer.c.
+ */
+
+#ifndef _CIRCULARBITBUFFER_H_
+#define _CIRCULARBITBUFFER_H_
+
+ /* Includes: */
+ #include <avr/io.h>
+ #include <stdbool.h>
+
+ #include <LUFA/Common/Common.h>
+
+ /* Macros: */
+ #if (defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
+ defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__)) || defined(__DOXYGEN__)
+ /** Maximum number of bits which can be stored into a bit buffer. The memory usage is one eighth of this value per buffer. */
+ #define MAX_BITS 8192
+ #else
+ #define MAX_BITS 1024
+ #endif
+
+ /* Type Defines: */
+ /** Type define for a pointer to a bit in a bit buffer. */
+ typedef struct
+ {
+ uint8_t* CurrentByte; /**< Pointer to the current byte in the buffer */
+ uint8_t ByteMask; /**< Mask of the current bit in the buffer */
+ } BitBufferPointer_t;
+
+ /** Type define for a circular packet bit buffer. */
+ typedef struct
+ {
+ uint8_t Data[MAX_BITS / 8]; /**< Buffer to hold the stored bits in packed form */
+ uint16_t Elements; /**< Number of stored bits in the bit buffer */
+
+ BitBufferPointer_t In; /**< Bit pointer to the next storage location in the buffer */
+ BitBufferPointer_t Out; /**< Bit pointer to the next retrieval location in the buffer */
+ } BitBuffer_t;
+
+ /* Function Prototypes: */
+ /** Initializes or resets a given bit buffer, ready to store new bits.
+ *
+ * \param[in,out] Buffer Bit buffer to initialize
+ */
+ void BitBuffer_Init(BitBuffer_t* const Buffer) ATTR_NON_NULL_PTR_ARG(1);
+
+ /** Stores a bit into the next location inside a given bit buffer.
+ *
+ * \param[in,out] Buffer Bit buffer to store a bit into
+ * \param[in] Bit Bit to store into the buffer
+ */
+ void BitBuffer_StoreNextBit(BitBuffer_t* const Buffer,
+ const bool Bit) ATTR_NON_NULL_PTR_ARG(1);
+
+ /** Retrieves a bit from the next location inside a given bit buffer.
+ *
+ * \param[in,out] Buffer Bit buffer to retrieve a bit from
+ *
+ * \return Next bit from the buffer
+ */
+ bool BitBuffer_GetNextBit(BitBuffer_t* const Buffer) ATTR_NON_NULL_PTR_ARG(1);
+
+#endif
+