From 74298f8ca11dc8d3b0359d1d4e124d6494c3eeac Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Fri, 10 Apr 2009 01:15:42 +0200 Subject: * digital/avr/modules/usb: - imported LUFA. --- .../lufa/Projects/Magstripe/CircularBitBuffer.h | 90 ++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 digital/avr/modules/usb/lufa/Projects/Magstripe/CircularBitBuffer.h (limited to 'digital/avr/modules/usb/lufa/Projects/Magstripe/CircularBitBuffer.h') diff --git a/digital/avr/modules/usb/lufa/Projects/Magstripe/CircularBitBuffer.h b/digital/avr/modules/usb/lufa/Projects/Magstripe/CircularBitBuffer.h new file mode 100644 index 00000000..0fb80b9d --- /dev/null +++ b/digital/avr/modules/usb/lufa/Projects/Magstripe/CircularBitBuffer.h @@ -0,0 +1,90 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2009. + + dean [at] fourwalledcubicle [dot] com + www.fourwalledcubicle.com +*/ + +/* + Copyright 2009 Denver Gingerich (denver [at] ossguy [dot] com) + Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, and distribute this software + and its documentation for any purpose and without fee is hereby + granted, 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 disclaim 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 + #include + + #include + + /* Macros: */ + /** Maximum number of bits which can be stored into a bit buffer. The memory usage is one eigth of this value per buffer. */ + #define MAX_BITS 1024 + + /* 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 Buffer Bit buffer to initialize + */ + void BitBuffer_Init(BitBuffer_t* Buffer) ATTR_NON_NULL_PTR_ARG(1); + + /** Stores a bit into the next location inside a given bit buffer. + * + * \param Buffer Bit buffer to store a bit into + * \param Bit Bit to store into the buffer + */ + void BitBuffer_StoreNextBit(BitBuffer_t* Buffer, bool Bit) ATTR_NON_NULL_PTR_ARG(1); + + /** Retrieves a bit from the next location inside a given bit buffer. + * + * \param Buffer Bit buffer to store a bit into + * + * \return Next bit from the buffer + */ + bool BitBuffer_GetNextBit(BitBuffer_t* Buffer) ATTR_NON_NULL_PTR_ARG(1); + +#endif -- cgit v1.2.3