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117 lines
4.3 KiB
117 lines
4.3 KiB
16 years ago
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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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 disclaim 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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/* Buffer Configuration: */
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/* Buffer length - select static size of created ring buffers: */
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#define BUFF_STATICSIZE 128 // Set to the static ring buffer size for all ring buffers (place size after define)
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/* Volatile mode - uncomment to make buffers volatile, for use in ISRs, etc: */
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#define BUFF_VOLATILE // Uncomment to cause all ring buffers to become volatile (and atomic if multi-byte) in access
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/* Drop mode - select behaviour when Buffer_StoreElement called on a full buffer: */
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#define BUFF_DROPOLD // Uncomment to cause full ring buffers to drop the oldest character to make space when full
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// #define BUFF_DROPNEW // Uncomment to cause full ring buffers to drop the new character when full
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// #define BUFF_NODROPCHECK // Uncomment to ignore full ring buffer checks - checking left to user!
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/* Underflow behaviour - select behaviour when Buffer_GetElement is called with an empty ring buffer: */
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//#define BUFF_EMPTYRETURNSZERO // Uncomment to return 0 when an empty ring buffer is read
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#define BUFF_NOEMPTYCHECK // Uncomment to disable checking of empty ring buffers - checking left to user!
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/* Buffer storage type - set the datatype for the stored data */
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#define BUFF_DATATYPE uint8_t // Change to the data type that is going to be stored into the buffer
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/* Peek routine - uncomment to include the peek routine (fetches next byte without removing it from the buffer */
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//#define BUFF_USEPEEK
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#ifndef _RINGBUFF_H_
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#define _RINGBUFF_H_
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/* Includes: */
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/atomic.h>
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#include <limits.h>
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#include <LUFA/Common/Common.h>
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/* Defines and checks: */
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#if defined(BUFF_STATICSIZE)
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#define BUFF_LENGTH BUFF_STATICSIZE
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#else
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#error No buffer length specified!
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#endif
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#if !(defined(BUFF_DROPOLD) || defined(BUFF_DROPNEW) || defined(BUFF_NODROPCHECK))
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#error No buffer drop mode specified.
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#endif
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#if !defined(BUFF_DATATYPE)
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#error Ringbuffer storage data type not specified.
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#endif
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#if defined(BUFF_VOLATILE)
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#define BUFF_MODE volatile
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#define BUFF_ATOMIC_BLOCK ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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#else
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#define BUFF_MODE
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#define BUFF_ATOMIC_BLOCK
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#endif
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#if (BUFF_STATICSIZE > LONG_MAX)
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#define RingBuff_Elements_t uint64_t
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#elif (BUFF_STATICSIZE > INT_MAX)
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#define RingBuff_Elements_t uint32_t
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#elif (BUFF_STATICSIZE > CHAR_MAX)
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#define RingBuff_Elements_t uint16_t
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#else
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#define RingBuff_Elements_t uint8_t
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#endif
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/* Type Defines: */
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typedef BUFF_DATATYPE RingBuff_Data_t;
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typedef BUFF_MODE struct
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{
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RingBuff_Data_t Buffer[BUFF_LENGTH];
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RingBuff_Data_t* InPtr;
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RingBuff_Data_t* OutPtr;
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RingBuff_Elements_t Elements;
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} RingBuff_t;
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/* Function Prototypes: */
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void Buffer_Initialize(RingBuff_t* Buff);
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void Buffer_StoreElement(RingBuff_t* Buffer, RingBuff_Data_t Data);
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RingBuff_Data_t Buffer_GetElement(RingBuff_t* Buffer);
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#if defined(BUFF_USEPEEK)
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RingBuff_Data_t Buffer_PeekElement(const RingBuff_t* Buffer);
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#endif
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#endif
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