Make a new general RingBuffer.h misc library driver, instead of the per-application LightweightRingBuff.h ring buffers. Change over projects to use the new driver.
Add ORDERED_EP_CONFIG to the device Projects (only) that use only a single class driver, or where the endpoint ordering is fixed, to save on compiled binary size. Added new GCC_FORCE_POINTER_ACCESS() macro to correct GCC's mishandling of struct pointers.pull/1469/head
Dean Camera
14 years ago
parent
12418e6eaf
commit
39ac72f2d1
File diff suppressed because one or more lines are too long
@ -1,211 +1,254 @@
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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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 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,
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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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/** \file
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*
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* Ultra lightweight ring buffer, for fast insertion/deletion. This uses inlined functions
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* for maximum speed. All buffers created with this library must be of the same size, however
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* multiple independant buffers can be created.
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*
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* Note that for each buffer, insertion and removal operations may occur at the same time (via
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* a multithreaded ISR based system) however the same kind of operation (two or more insertions
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* or deletions) must not overlap. If there is possibility of two or more of the same kind of
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* operating occuring at the same point in time, atomic (mutex) locking should be used.
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*/
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#ifndef _ULW_RING_BUFF_H_
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#define _ULW_RING_BUFF_H_
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/* Includes: */
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#include <util/atomic.h>
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#include <stdint.h>
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#include <stdbool.h>
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/* Defines: */
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/** Size of each ring buffer, in data elements - must be between 1 and 255. */
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#define BUFFER_SIZE 128
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/** Type of data to store into the buffer. */
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#define RingBuff_Data_t uint8_t
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/** Datatype which may be used to store the count of data stored in a buffer, retrieved
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* via a call to \ref RingBuffer_GetCount().
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*/
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#if (BUFFER_SIZE <= 0xFF)
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#define RingBuff_Count_t uint8_t
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#else
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#define RingBuff_Count_t uint16_t
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#endif
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/* Type Defines: */
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/** Type define for a new ring buffer object. Buffers should be initialized via a call to
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* \ref RingBuffer_InitBuffer() before use.
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*/
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typedef struct
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{
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RingBuff_Data_t Buffer[BUFFER_SIZE]; /**< Internal ring buffer data, referenced by the buffer pointers. */
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RingBuff_Data_t* In; /**< Current storage location in the circular buffer */
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RingBuff_Data_t* Out; /**< Current retrieval location in the circular buffer */
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RingBuff_Count_t Count;
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} RingBuff_t;
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/* Inline Functions: */
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/** Initializes a ring buffer ready for use. Buffers must be initialized via this function
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* before any operations are called upon them. Already initialized buffers may be reset
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* by re-initializing them using this function.
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*
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* \param[out] Buffer Pointer to a ring buffer structure to initialize
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*/
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static inline void RingBuffer_InitBuffer(RingBuff_t* const Buffer)
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{
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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Buffer->In = Buffer->Buffer;
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Buffer->Out = Buffer->Buffer;
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}
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}
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/** Retrieves the minimum number of bytes stored in a particular buffer. This value is computed
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* by entering an atomic lock on the buffer while the IN and OUT locations are fetched, so that
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* the buffer cannot be modified while the computation takes place. This value should be cached
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* when reading out the contents of the buffer, so that as small a time as possible is spent
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* in an atomic lock.
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*
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* \note The value returned by this function is guaranteed to only be the minimum number of bytes
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* stored in the given buffer; this value may change as other threads write new data and so
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* the returned number should be used only to determine how many successive reads may safely
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* be performed on the buffer.
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*
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* \param[in] Buffer Pointer to a ring buffer structure whose count is to be computed
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*/
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static inline RingBuff_Count_t RingBuffer_GetCount(RingBuff_t* const Buffer)
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{
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RingBuff_Count_t Count;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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Count = Buffer->Count;
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}
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return Count;
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}
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/** Atomically determines if the specified ring buffer contains any free space. This should
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* be tested before storing data to the buffer, to ensure that no data is lost due to a
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* buffer overrun.
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*
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* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
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*
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* \return Boolean true if the buffer contains no free space, false otherwise
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*/
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static inline bool RingBuffer_IsFull(RingBuff_t* const Buffer)
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{
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return (RingBuffer_GetCount(Buffer) == BUFFER_SIZE);
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}
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/** Atomically determines if the specified ring buffer contains any data. This should
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* be tested before removing data from the buffer, to ensure that the buffer does not
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* underflow.
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*
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* If the data is to be removed in a loop, store the total number of bytes stored in the
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* buffer (via a call to the \ref RingBuffer_GetCount() function) in a temporary variable
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* to reduce the time spent in atomicity locks.
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*
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* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
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*
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* \return Boolean true if the buffer contains no free space, false otherwise
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*/
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static inline bool RingBuffer_IsEmpty(RingBuff_t* const Buffer)
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{
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return (RingBuffer_GetCount(Buffer) == 0);
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}
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/** Inserts an element into the ring buffer.
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*
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* \note Only one execution thread (main program thread or an ISR) may insert into a single buffer
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* otherwise data corruption may occur. Insertion and removal may occur from different execution
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* threads.
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*
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* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
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* \param[in] Data Data element to insert into the buffer
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*/
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static inline void RingBuffer_Insert(RingBuff_t* const Buffer,
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const RingBuff_Data_t Data)
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{
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*Buffer->In = Data;
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if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
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Buffer->In = Buffer->Buffer;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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Buffer->Count++;
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}
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}
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/** Removes an element from the ring buffer.
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*
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* \note Only one execution thread (main program thread or an ISR) may remove from a single buffer
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* otherwise data corruption may occur. Insertion and removal may occur from different execution
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* threads.
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*
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* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
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*
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* \return Next data element stored in the buffer
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*/
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static inline RingBuff_Data_t RingBuffer_Remove(RingBuff_t* const Buffer)
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{
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RingBuff_Data_t Data = *Buffer->Out;
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if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
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Buffer->Out = Buffer->Buffer;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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Buffer->Count--;
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}
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return Data;
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}
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/** Returns the next element stored in the ring buffer, without removing it.
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*
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* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
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*
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* \return Next data element stored in the buffer
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*/
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static inline RingBuff_Data_t RingBuffer_Peek(RingBuff_t* const Buffer)
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{
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return *Buffer->Out;
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}
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#endif
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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||||
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
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||||
software without specific, written prior permission.
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||||
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The author disclaim all warranties with regard to this
|
||||
software, including all implied warranties of merchantability
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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
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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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/** \file
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* \brief Lightweight ring buffer, for fast insertion/deletion.
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*
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* Lightweight ring buffer, for fast insertion/deletion. Multiple buffers can be created of
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* different sizes to suit different needs.
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*
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* Note that for each buffer, insertion and removal operations may occur at the same time (via
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* a multithreaded ISR based system) however the same kind of operation (two or more insertions
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* or deletions) must not overlap. If there is possibility of two or more of the same kind of
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* operating occuring at the same point in time, atomic (mutex) locking should be used.
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*/
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/** \ingroup Group_MiscDrivers
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* @defgroup Group_RingBuff Generic Byte Ring Buffer - LUFA/Drivers/Misc/RingBuffer.h
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*
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* \section Sec_Dependencies Module Source Dependencies
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* The following files must be built with any user project that uses this module:
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* - None
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*
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* \section Module Description
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* Lightweight ring buffer, for fast insertion/deletion. Multiple buffers can be created of
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* different sizes to suit different needs.
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*
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* Note that for each buffer, insertion and removal operations may occur at the same time (via
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* a multithreaded ISR based system) however the same kind of operation (two or more insertions
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* or deletions) must not overlap. If there is possibility of two or more of the same kind of
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* operating occuring at the same point in time, atomic (mutex) locking should be used.
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*
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* Example Usage:
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* \code
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* // Create the buffer structure and its underlying storage array
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* RingBuff_t Buffer;
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* uint8_t BufferData[128];
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*
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* // Initialise the buffer with the created storage array
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* RingBuffer_InitBuffer(&Buffer, BufferData, sizeof(BufferData));
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*
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* // Insert some data into the buffer
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* RingBuffer_Insert(Buffer, 'H');
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* RingBuffer_Insert(Buffer, 'E');
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* RingBuffer_Insert(Buffer, 'L');
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* RingBuffer_Insert(Buffer, 'L');
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* RingBuffer_Insert(Buffer, 'O');
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*
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* // Cache the number of stored bytes in the buffer
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* uint16_t BufferCount = RingBuffer_GetCount(&Buffer);
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*
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* // Printer stored data length
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* printf("Buffer Length: %d, Buffer Data:\r\n", BufferCount);
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*
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* // Print contents of the buffer one character at a time
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* while (BufferCount--)
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* putc(RingBuffer_Remove(&Buffer));
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* \endcode
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*
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* @{
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*/
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#ifndef __RING_BUFF_H__
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#define __RING_BUFF_H__
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/* Includes: */
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#include <util/atomic.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <LUFA/Common/Common.h>
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/* Type Defines: */
|
||||
/** Type define for a new ring buffer object. Buffers should be initialized via a call to
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* \ref RingBuffer_InitBuffer() before use.
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*/
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typedef struct
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{
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uint8_t* In; /**< Current storage location in the circular buffer */
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uint8_t* Out; /**< Current retrieval location in the circular buffer */
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uint8_t* Start; /** Pointer to the start of the buffer's underlying storage array */
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uint8_t* End; /** Pointer to the end of the buffer's underlying storage array */
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uint8_t Size; /** Size of the buffer's underlying storage array */
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uint16_t Count; /** Number of bytes currently stored in the buffer */
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} RingBuff_t;
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/* Inline Functions: */
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/** Initializes a ring buffer ready for use. Buffers must be initialized via this function
|
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* before any operations are called upon them. Already initialized buffers may be reset
|
||||
* by re-initializing them using this function.
|
||||
*
|
||||
* \param[out] Buffer Pointer to a ring buffer structure to initialize
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||||
* \param[out] DataPtr Pointer to a global array that will hold the data stored into the ring buffer
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* \param[out] Size Maximum number of bytes that can be stored in the underlying data array
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*/
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static inline void RingBuffer_InitBuffer(RingBuff_t* Buffer, uint8_t* const DataPtr, const uint16_t Size)
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{
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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GCC_FORCE_POINTER_ACCESS(Buffer);
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|
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Buffer->In = DataPtr;
|
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Buffer->Out = DataPtr;
|
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Buffer->Start = &DataPtr[0];
|
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Buffer->End = &DataPtr[Size];
|
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Buffer->Size = Size;
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Buffer->Count = 0;
|
||||
}
|
||||
}
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|
||||
/** Retrieves the minimum number of bytes stored in a particular buffer. This value is computed
|
||||
* by entering an atomic lock on the buffer while the IN and OUT locations are fetched, so that
|
||||
* the buffer cannot be modified while the computation takes place. This value should be cached
|
||||
* when reading out the contents of the buffer, so that as small a time as possible is spent
|
||||
* in an atomic lock.
|
||||
*
|
||||
* \note The value returned by this function is guaranteed to only be the minimum number of bytes
|
||||
* stored in the given buffer; this value may change as other threads write new data and so
|
||||
* the returned number should be used only to determine how many successive reads may safely
|
||||
* be performed on the buffer.
|
||||
*
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||||
* \param[in] Buffer Pointer to a ring buffer structure whose count is to be computed
|
||||
*/
|
||||
static inline uint16_t RingBuffer_GetCount(RingBuff_t* const Buffer)
|
||||
{
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||||
uint16_t Count;
|
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||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Count = Buffer->Count;
|
||||
}
|
||||
|
||||
return Count;
|
||||
}
|
||||
|
||||
/** Atomically determines if the specified ring buffer contains any free space. This should
|
||||
* be tested before storing data to the buffer, to ensure that no data is lost due to a
|
||||
* buffer overrun.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
*
|
||||
* \return Boolean true if the buffer contains no free space, false otherwise
|
||||
*/
|
||||
static inline bool RingBuffer_IsFull(RingBuff_t* const Buffer)
|
||||
{
|
||||
return (RingBuffer_GetCount(Buffer) == Buffer->Size);
|
||||
}
|
||||
|
||||
/** Atomically determines if the specified ring buffer contains any data. This should
|
||||
* be tested before removing data from the buffer, to ensure that the buffer does not
|
||||
* underflow.
|
||||
*
|
||||
* If the data is to be removed in a loop, store the total number of bytes stored in the
|
||||
* buffer (via a call to the \ref RingBuffer_GetCount() function) in a temporary variable
|
||||
* to reduce the time spent in atomicity locks.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
*
|
||||
* \return Boolean true if the buffer contains no free space, false otherwise
|
||||
*/
|
||||
static inline bool RingBuffer_IsEmpty(RingBuff_t* const Buffer)
|
||||
{
|
||||
return (RingBuffer_GetCount(Buffer) == 0);
|
||||
}
|
||||
|
||||
/** Inserts an element into the ring buffer.
|
||||
*
|
||||
* \note Only one execution thread (main program thread or an ISR) may insert into a single buffer
|
||||
* otherwise data corruption may occur. Insertion and removal may occur from different execution
|
||||
* threads.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
* \param[in] Data Data element to insert into the buffer
|
||||
*/
|
||||
static inline void RingBuffer_Insert(RingBuff_t* const Buffer,
|
||||
const uint8_t Data)
|
||||
{
|
||||
*Buffer->In = Data;
|
||||
|
||||
if (++Buffer->In == Buffer->End)
|
||||
Buffer->In = Buffer->Start;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->Count++;
|
||||
}
|
||||
}
|
||||
|
||||
/** Removes an element from the ring buffer.
|
||||
*
|
||||
* \note Only one execution thread (main program thread or an ISR) may remove from a single buffer
|
||||
* otherwise data corruption may occur. Insertion and removal may occur from different execution
|
||||
* threads.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
|
||||
*
|
||||
* \return Next data element stored in the buffer
|
||||
*/
|
||||
static inline uint8_t RingBuffer_Remove(RingBuff_t* const Buffer)
|
||||
{
|
||||
uint8_t Data = *Buffer->Out;
|
||||
|
||||
if (++Buffer->Out == Buffer->End)
|
||||
Buffer->Out = Buffer->Start;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->Count--;
|
||||
}
|
||||
|
||||
return Data;
|
||||
}
|
||||
|
||||
/** Returns the next element stored in the ring buffer, without removing it.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
|
||||
*
|
||||
* \return Next data element stored in the buffer
|
||||
*/
|
||||
static inline uint8_t RingBuffer_Peek(RingBuff_t* const Buffer)
|
||||
{
|
||||
return *Buffer->Out;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/** @} */
|
||||
|
||||
@ -1,211 +0,0 @@
|
||||
/*
|
||||
LUFA Library
|
||||
Copyright (C) Dean Camera, 2010.
|
||||
|
||||
dean [at] fourwalledcubicle [dot] com
|
||||
www.lufa-lib.org
|
||||
*/
|
||||
|
||||
/*
|
||||
Copyright 2010 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 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
|
||||
*
|
||||
* Ultra lightweight ring buffer, for fast insertion/deletion. This uses inlined functions
|
||||
* for maximum speed. All buffers created with this library must be of the same size, however
|
||||
* multiple independant buffers can be created.
|
||||
*
|
||||
* Note that for each buffer, insertion and removal operations may occur at the same time (via
|
||||
* a multithreaded ISR based system) however the same kind of operation (two or more insertions
|
||||
* or deletions) must not overlap. If there is possibility of two or more of the same kind of
|
||||
* operating occuring at the same point in time, atomic (mutex) locking should be used.
|
||||
*/
|
||||
|
||||
#ifndef _ULW_RING_BUFF_H_
|
||||
#define _ULW_RING_BUFF_H_
|
||||
|
||||
/* Includes: */
|
||||
#include <util/atomic.h>
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
/* Defines: */
|
||||
/** Size of each ring buffer, in data elements - must be between 1 and 255. */
|
||||
#define BUFFER_SIZE 128
|
||||
|
||||
/** Type of data to store into the buffer. */
|
||||
#define RingBuff_Data_t uint8_t
|
||||
|
||||
/** Datatype which may be used to store the count of data stored in a buffer, retrieved
|
||||
* via a call to \ref RingBuffer_GetCount().
|
||||
*/
|
||||
#if (BUFFER_SIZE <= 0xFF)
|
||||
#define RingBuff_Count_t uint8_t
|
||||
#else
|
||||
#define RingBuff_Count_t uint16_t
|
||||
#endif
|
||||
|
||||
/* Type Defines: */
|
||||
/** Type define for a new ring buffer object. Buffers should be initialized via a call to
|
||||
* \ref RingBuffer_InitBuffer() before use.
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
RingBuff_Data_t Buffer[BUFFER_SIZE]; /**< Internal ring buffer data, referenced by the buffer pointers. */
|
||||
RingBuff_Data_t* In; /**< Current storage location in the circular buffer */
|
||||
RingBuff_Data_t* Out; /**< Current retrieval location in the circular buffer */
|
||||
RingBuff_Count_t Count;
|
||||
} RingBuff_t;
|
||||
|
||||
/* Inline Functions: */
|
||||
/** Initializes a ring buffer ready for use. Buffers must be initialized via this function
|
||||
* before any operations are called upon them. Already initialized buffers may be reset
|
||||
* by re-initializing them using this function.
|
||||
*
|
||||
* \param[out] Buffer Pointer to a ring buffer structure to initialize
|
||||
*/
|
||||
static inline void RingBuffer_InitBuffer(RingBuff_t* const Buffer)
|
||||
{
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->In = Buffer->Buffer;
|
||||
Buffer->Out = Buffer->Buffer;
|
||||
}
|
||||
}
|
||||
|
||||
/** Retrieves the minimum number of bytes stored in a particular buffer. This value is computed
|
||||
* by entering an atomic lock on the buffer while the IN and OUT locations are fetched, so that
|
||||
* the buffer cannot be modified while the computation takes place. This value should be cached
|
||||
* when reading out the contents of the buffer, so that as small a time as possible is spent
|
||||
* in an atomic lock.
|
||||
*
|
||||
* \note The value returned by this function is guaranteed to only be the minimum number of bytes
|
||||
* stored in the given buffer; this value may change as other threads write new data and so
|
||||
* the returned number should be used only to determine how many successive reads may safely
|
||||
* be performed on the buffer.
|
||||
*
|
||||
* \param[in] Buffer Pointer to a ring buffer structure whose count is to be computed
|
||||
*/
|
||||
static inline RingBuff_Count_t RingBuffer_GetCount(RingBuff_t* const Buffer)
|
||||
{
|
||||
RingBuff_Count_t Count;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Count = Buffer->Count;
|
||||
}
|
||||
|
||||
return Count;
|
||||
}
|
||||
|
||||
/** Atomically determines if the specified ring buffer contains any free space. This should
|
||||
* be tested before storing data to the buffer, to ensure that no data is lost due to a
|
||||
* buffer overrun.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
*
|
||||
* \return Boolean true if the buffer contains no free space, false otherwise
|
||||
*/
|
||||
static inline bool RingBuffer_IsFull(RingBuff_t* const Buffer)
|
||||
{
|
||||
return (RingBuffer_GetCount(Buffer) == BUFFER_SIZE);
|
||||
}
|
||||
|
||||
/** Atomically determines if the specified ring buffer contains any data. This should
|
||||
* be tested before removing data from the buffer, to ensure that the buffer does not
|
||||
* underflow.
|
||||
*
|
||||
* If the data is to be removed in a loop, store the total number of bytes stored in the
|
||||
* buffer (via a call to the \ref RingBuffer_GetCount() function) in a temporary variable
|
||||
* to reduce the time spent in atomicity locks.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
*
|
||||
* \return Boolean true if the buffer contains no free space, false otherwise
|
||||
*/
|
||||
static inline bool RingBuffer_IsEmpty(RingBuff_t* const Buffer)
|
||||
{
|
||||
return (RingBuffer_GetCount(Buffer) == 0);
|
||||
}
|
||||
|
||||
/** Inserts an element into the ring buffer.
|
||||
*
|
||||
* \note Only one execution thread (main program thread or an ISR) may insert into a single buffer
|
||||
* otherwise data corruption may occur. Insertion and removal may occur from different execution
|
||||
* threads.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
* \param[in] Data Data element to insert into the buffer
|
||||
*/
|
||||
static inline void RingBuffer_Insert(RingBuff_t* const Buffer,
|
||||
const RingBuff_Data_t Data)
|
||||
{
|
||||
*Buffer->In = Data;
|
||||
|
||||
if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
|
||||
Buffer->In = Buffer->Buffer;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->Count++;
|
||||
}
|
||||
}
|
||||
|
||||
/** Removes an element from the ring buffer.
|
||||
*
|
||||
* \note Only one execution thread (main program thread or an ISR) may remove from a single buffer
|
||||
* otherwise data corruption may occur. Insertion and removal may occur from different execution
|
||||
* threads.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
|
||||
*
|
||||
* \return Next data element stored in the buffer
|
||||
*/
|
||||
static inline RingBuff_Data_t RingBuffer_Remove(RingBuff_t* const Buffer)
|
||||
{
|
||||
RingBuff_Data_t Data = *Buffer->Out;
|
||||
|
||||
if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
|
||||
Buffer->Out = Buffer->Buffer;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->Count--;
|
||||
}
|
||||
|
||||
return Data;
|
||||
}
|
||||
|
||||
/** Returns the next element stored in the ring buffer, without removing it.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
|
||||
*
|
||||
* \return Next data element stored in the buffer
|
||||
*/
|
||||
static inline RingBuff_Data_t RingBuffer_Peek(RingBuff_t* const Buffer)
|
||||
{
|
||||
return *Buffer->Out;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
@ -1,211 +0,0 @@
|
||||
/*
|
||||
LUFA Library
|
||||
Copyright (C) Dean Camera, 2010.
|
||||
|
||||
dean [at] fourwalledcubicle [dot] com
|
||||
www.lufa-lib.org
|
||||
*/
|
||||
|
||||
/*
|
||||
Copyright 2010 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 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
|
||||
*
|
||||
* Ultra lightweight ring buffer, for fast insertion/deletion. This uses inlined functions
|
||||
* for maximum speed. All buffers created with this library must be of the same size, however
|
||||
* multiple independant buffers can be created.
|
||||
*
|
||||
* Note that for each buffer, insertion and removal operations may occur at the same time (via
|
||||
* a multithreaded ISR based system) however the same kind of operation (two or more insertions
|
||||
* or deletions) must not overlap. If there is possibility of two or more of the same kind of
|
||||
* operating occuring at the same point in time, atomic (mutex) locking should be used.
|
||||
*/
|
||||
|
||||
#ifndef _ULW_RING_BUFF_H_
|
||||
#define _ULW_RING_BUFF_H_
|
||||
|
||||
/* Includes: */
|
||||
#include <util/atomic.h>
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
/* Defines: */
|
||||
/** Size of each ring buffer, in data elements - must be between 1 and 255. */
|
||||
#define BUFFER_SIZE 255
|
||||
|
||||
/** Type of data to store into the buffer. */
|
||||
#define RingBuff_Data_t uint8_t
|
||||
|
||||
/** Datatype which may be used to store the count of data stored in a buffer, retrieved
|
||||
* via a call to \ref RingBuffer_GetCount().
|
||||
*/
|
||||
#if (BUFFER_SIZE <= 0xFF)
|
||||
#define RingBuff_Count_t uint8_t
|
||||
#else
|
||||
#define RingBuff_Count_t uint16_t
|
||||
#endif
|
||||
|
||||
/* Type Defines: */
|
||||
/** Type define for a new ring buffer object. Buffers should be initialized via a call to
|
||||
* \ref RingBuffer_InitBuffer() before use.
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
RingBuff_Data_t Buffer[BUFFER_SIZE]; /**< Internal ring buffer data, referenced by the buffer pointers. */
|
||||
RingBuff_Data_t* In; /**< Current storage location in the circular buffer */
|
||||
RingBuff_Data_t* Out; /**< Current retrieval location in the circular buffer */
|
||||
RingBuff_Count_t Count;
|
||||
} RingBuff_t;
|
||||
|
||||
/* Inline Functions: */
|
||||
/** Initializes a ring buffer ready for use. Buffers must be initialized via this function
|
||||
* before any operations are called upon them. Already initialized buffers may be reset
|
||||
* by re-initializing them using this function.
|
||||
*
|
||||
* \param[out] Buffer Pointer to a ring buffer structure to initialize
|
||||
*/
|
||||
static inline void RingBuffer_InitBuffer(RingBuff_t* const Buffer)
|
||||
{
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->In = Buffer->Buffer;
|
||||
Buffer->Out = Buffer->Buffer;
|
||||
}
|
||||
}
|
||||
|
||||
/** Retrieves the minimum number of bytes stored in a particular buffer. This value is computed
|
||||
* by entering an atomic lock on the buffer while the IN and OUT locations are fetched, so that
|
||||
* the buffer cannot be modified while the computation takes place. This value should be cached
|
||||
* when reading out the contents of the buffer, so that as small a time as possible is spent
|
||||
* in an atomic lock.
|
||||
*
|
||||
* \note The value returned by this function is guaranteed to only be the minimum number of bytes
|
||||
* stored in the given buffer; this value may change as other threads write new data and so
|
||||
* the returned number should be used only to determine how many successive reads may safely
|
||||
* be performed on the buffer.
|
||||
*
|
||||
* \param[in] Buffer Pointer to a ring buffer structure whose count is to be computed
|
||||
*/
|
||||
static inline RingBuff_Count_t RingBuffer_GetCount(RingBuff_t* const Buffer)
|
||||
{
|
||||
RingBuff_Count_t Count;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Count = Buffer->Count;
|
||||
}
|
||||
|
||||
return Count;
|
||||
}
|
||||
|
||||
/** Atomically determines if the specified ring buffer contains any free space. This should
|
||||
* be tested before storing data to the buffer, to ensure that no data is lost due to a
|
||||
* buffer overrun.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
*
|
||||
* \return Boolean true if the buffer contains no free space, false otherwise
|
||||
*/
|
||||
static inline bool RingBuffer_IsFull(RingBuff_t* const Buffer)
|
||||
{
|
||||
return (RingBuffer_GetCount(Buffer) == BUFFER_SIZE);
|
||||
}
|
||||
|
||||
/** Atomically determines if the specified ring buffer contains any data. This should
|
||||
* be tested before removing data from the buffer, to ensure that the buffer does not
|
||||
* underflow.
|
||||
*
|
||||
* If the data is to be removed in a loop, store the total number of bytes stored in the
|
||||
* buffer (via a call to the \ref RingBuffer_GetCount() function) in a temporary variable
|
||||
* to reduce the time spent in atomicity locks.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
*
|
||||
* \return Boolean true if the buffer contains no free space, false otherwise
|
||||
*/
|
||||
static inline bool RingBuffer_IsEmpty(RingBuff_t* const Buffer)
|
||||
{
|
||||
return (RingBuffer_GetCount(Buffer) == 0);
|
||||
}
|
||||
|
||||
/** Inserts an element into the ring buffer.
|
||||
*
|
||||
* \note Only one execution thread (main program thread or an ISR) may insert into a single buffer
|
||||
* otherwise data corruption may occur. Insertion and removal may occur from different execution
|
||||
* threads.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to insert into
|
||||
* \param[in] Data Data element to insert into the buffer
|
||||
*/
|
||||
static inline void RingBuffer_Insert(RingBuff_t* const Buffer,
|
||||
const RingBuff_Data_t Data)
|
||||
{
|
||||
*Buffer->In = Data;
|
||||
|
||||
if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
|
||||
Buffer->In = Buffer->Buffer;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->Count++;
|
||||
}
|
||||
}
|
||||
|
||||
/** Removes an element from the ring buffer.
|
||||
*
|
||||
* \note Only one execution thread (main program thread or an ISR) may remove from a single buffer
|
||||
* otherwise data corruption may occur. Insertion and removal may occur from different execution
|
||||
* threads.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
|
||||
*
|
||||
* \return Next data element stored in the buffer
|
||||
*/
|
||||
static inline RingBuff_Data_t RingBuffer_Remove(RingBuff_t* const Buffer)
|
||||
{
|
||||
RingBuff_Data_t Data = *Buffer->Out;
|
||||
|
||||
if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
|
||||
Buffer->Out = Buffer->Buffer;
|
||||
|
||||
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
|
||||
{
|
||||
Buffer->Count--;
|
||||
}
|
||||
|
||||
return Data;
|
||||
}
|
||||
|
||||
/** Returns the next element stored in the ring buffer, without removing it.
|
||||
*
|
||||
* \param[in,out] Buffer Pointer to a ring buffer structure to retrieve from
|
||||
*
|
||||
* \return Next data element stored in the buffer
|
||||
*/
|
||||
static inline RingBuff_Data_t RingBuffer_Peek(RingBuff_t* const Buffer)
|
||||
{
|
||||
return *Buffer->Out;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in new issue