X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/6a10d6b465be27db090d760dc0fbe722c94e4344..032a83e9e1bda3b4724870ad65310414a8020351:/Projects/Magstripe/CircularBitBuffer.h

diff --git a/Projects/Magstripe/CircularBitBuffer.h b/Projects/Magstripe/CircularBitBuffer.h
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+/*
+             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 <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 eigth of this value per buffer. */
+			#define MAX_BITS 20480
+		#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 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