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author | Jack Humbert <jack.humb@gmail.com> | 2015-10-27 14:52:18 -0400 |
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committer | Jack Humbert <jack.humb@gmail.com> | 2015-10-27 14:52:18 -0400 |
commit | d311fd8d1a0af3b767d26b520d399bf0db22f058 (patch) | |
tree | b9de5704143ac205b4e26222f9d7551e9b161924 /tmk_core/protocol/lufa/LUFA-git/Projects/Magstripe/Lib/CircularBitBuffer.h | |
parent | a766918d5c48204375f4c207b30bbbf1389df14f (diff) | |
parent | 6f3141965e88c4ee0ebf7c18a243e4c2d9c5021b (diff) |
Merge pull request #34 from jackhumbert/tmk-master
merging from tmk, new_project script and template
Diffstat (limited to 'tmk_core/protocol/lufa/LUFA-git/Projects/Magstripe/Lib/CircularBitBuffer.h')
-rw-r--r-- | tmk_core/protocol/lufa/LUFA-git/Projects/Magstripe/Lib/CircularBitBuffer.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/tmk_core/protocol/lufa/LUFA-git/Projects/Magstripe/Lib/CircularBitBuffer.h b/tmk_core/protocol/lufa/LUFA-git/Projects/Magstripe/Lib/CircularBitBuffer.h new file mode 100644 index 0000000000..918c825337 --- /dev/null +++ b/tmk_core/protocol/lufa/LUFA-git/Projects/Magstripe/Lib/CircularBitBuffer.h @@ -0,0 +1,97 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2014. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2010 Denver Gingerich (denver [at] ossguy [dot] com) + Copyright 2014 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 + |