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Diffstat (limited to 'protocol/lufa/LUFA-120730/LUFA/Drivers/Misc/RingBuffer.h')
| -rw-r--r-- | protocol/lufa/LUFA-120730/LUFA/Drivers/Misc/RingBuffer.h | 303 |
1 files changed, 0 insertions, 303 deletions
diff --git a/protocol/lufa/LUFA-120730/LUFA/Drivers/Misc/RingBuffer.h b/protocol/lufa/LUFA-120730/LUFA/Drivers/Misc/RingBuffer.h deleted file mode 100644 index 6d0f60ffa8..0000000000 --- a/protocol/lufa/LUFA-120730/LUFA/Drivers/Misc/RingBuffer.h +++ /dev/null @@ -1,303 +0,0 @@ -/*
- LUFA Library
- Copyright (C) Dean Camera, 2012.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
-*/
-
-/*
- Copyright 2012 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
- * \brief Lightweight ring (circular) buffer, for fast insertion/deletion of bytes.
- *
- * Lightweight ring buffer, for fast insertion/deletion. Multiple buffers can be created of
- * different sizes to suit different needs.
- *
- * Note that for each buffer, insertion and removal operations may occur at the same time (via
- * a multi-threaded 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 occurring at the same point in time, atomic (mutex) locking should be used.
- */
-
-/** \ingroup Group_MiscDrivers
- * \defgroup Group_RingBuff Generic Byte Ring Buffer - LUFA/Drivers/Misc/RingBuffer.h
- * \brief Lightweight ring buffer, for fast insertion/deletion of bytes.
- *
- * \section Sec_Dependencies Module Source Dependencies
- * The following files must be built with any user project that uses this module:
- * - None
- *
- * \section Sec_ModDescription Module Description
- * Lightweight ring buffer, for fast insertion/deletion. Multiple buffers can be created of
- * different sizes to suit different needs.
- *
- * Note that for each buffer, insertion and removal operations may occur at the same time (via
- * a multi-threaded 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 occurring at the same point in time, atomic (mutex) locking should be used.
- *
- * \section Sec_ExampleUsage Example Usage
- * The following snippet is an example of how this module may be used within a typical
- * application.
- *
- * \code
- * // Create the buffer structure and its underlying storage array
- * RingBuffer_t Buffer;
- * uint8_t BufferData[128];
- *
- * // Initialize the buffer with the created storage array
- * RingBuffer_InitBuffer(&Buffer, BufferData, sizeof(BufferData));
- *
- * // Insert some data into the buffer
- * RingBuffer_Insert(Buffer, 'H');
- * RingBuffer_Insert(Buffer, 'E');
- * RingBuffer_Insert(Buffer, 'L');
- * RingBuffer_Insert(Buffer, 'L');
- * RingBuffer_Insert(Buffer, 'O');
- *
- * // Cache the number of stored bytes in the buffer
- * uint16_t BufferCount = RingBuffer_GetCount(&Buffer);
- *
- * // Printer stored data length
- * printf("Buffer Length: %d, Buffer Data: \r\n", BufferCount);
- *
- * // Print contents of the buffer one character at a time
- * while (BufferCount--)
- * putc(RingBuffer_Remove(&Buffer));
- * \endcode
- *
- * @{
- */
-
-#ifndef __RING_BUFFER_H__
-#define __RING_BUFFER_H__
-
- /* Includes: */
- #include "../../Common/Common.h"
-
- /* Enable C linkage for C++ Compilers: */
- #if defined(__cplusplus)
- extern "C" {
- #endif
-
- /* Type Defines: */
- /** \brief Ring Buffer Management Structure.
- *
- * Type define for a new ring buffer object. Buffers should be initialized via a call to
- * \ref RingBuffer_InitBuffer() before use.
- */
- typedef struct
- {
- uint8_t* In; /**< Current storage location in the circular buffer. */
- uint8_t* Out; /**< Current retrieval location in the circular buffer. */
- uint8_t* Start; /**< Pointer to the start of the buffer's underlying storage array. */
- uint8_t* End; /**< Pointer to the end of the buffer's underlying storage array. */
- uint16_t Size; /**< Size of the buffer's underlying storage array. */
- uint16_t Count; /**< Number of bytes currently stored in the buffer. */
- } RingBuffer_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.
- * \param[out] DataPtr Pointer to a global array that will hold the data stored into the ring buffer.
- * \param[out] Size Maximum number of bytes that can be stored in the underlying data array.
- */
- static inline void RingBuffer_InitBuffer(RingBuffer_t* Buffer, uint8_t* const DataPtr, const uint16_t Size)
- ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
- static inline void RingBuffer_InitBuffer(RingBuffer_t* Buffer, uint8_t* const DataPtr, const uint16_t Size)
- {
- GCC_FORCE_POINTER_ACCESS(Buffer);
-
- uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
- GlobalInterruptDisable();
-
- Buffer->In = DataPtr;
- Buffer->Out = DataPtr;
- Buffer->Start = &DataPtr[0];
- Buffer->End = &DataPtr[Size];
- Buffer->Size = Size;
- Buffer->Count = 0;
-
- SetGlobalInterruptMask(CurrentGlobalInt);
- }
-
- /** Retrieves the current number of bytes stored in a particular buffer. This value is computed
- * by entering an atomic lock on the buffer, 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, thus
- * 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.
- *
- * \return Number of bytes currently stored in the buffer.
- */
- static inline uint16_t RingBuffer_GetCount(RingBuffer_t* const Buffer) ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
- static inline uint16_t RingBuffer_GetCount(RingBuffer_t* const Buffer)
- {
- uint16_t Count;
-
- uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
- GlobalInterruptDisable();
-
- Count = Buffer->Count;
-
- SetGlobalInterruptMask(CurrentGlobalInt);
- return Count;
- }
-
- /** Retrieves the free space in a particular buffer. This value is computed by entering an atomic lock
- * on the buffer, so that the buffer cannot be modified while the computation takes place.
- *
- * \note The value returned by this function is guaranteed to only be the maximum number of bytes
- * free in the given buffer; this value may change as other threads write new data, thus
- * the returned number should be used only to determine how many successive writes may safely
- * be performed on the buffer when there is a single writer thread.
- *
- * \param[in] Buffer Pointer to a ring buffer structure whose free count is to be computed.
- *
- * \return Number of free bytes in the buffer.
- */
- static inline uint16_t RingBuffer_GetFreeCount(RingBuffer_t* const Buffer) ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
- static inline uint16_t RingBuffer_GetFreeCount(RingBuffer_t* const Buffer)
- {
- return (Buffer->Size - RingBuffer_GetCount(Buffer));
- }
-
- /** 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 \c true if the buffer contains no free space, false otherwise.
- */
- static inline bool RingBuffer_IsEmpty(RingBuffer_t* const Buffer) ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
- static inline bool RingBuffer_IsEmpty(RingBuffer_t* const Buffer)
- {
- return (RingBuffer_GetCount(Buffer) == 0);
- }
-
- /** 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 \c true if the buffer contains no free space, false otherwise.
- */
- static inline bool RingBuffer_IsFull(RingBuffer_t* const Buffer) ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
- static inline bool RingBuffer_IsFull(RingBuffer_t* const Buffer)
- {
- return (RingBuffer_GetCount(Buffer) == Buffer->Size);
- }
-
- /** Inserts an element into the ring buffer.
- *
- * \warning 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(RingBuffer_t* Buffer, const uint8_t Data) ATTR_NON_NULL_PTR_ARG(1);
- static inline void RingBuffer_Insert(RingBuffer_t* Buffer, const uint8_t Data)
- {
- GCC_FORCE_POINTER_ACCESS(Buffer);
-
- *Buffer->In = Data;
-
- if (++Buffer->In == Buffer->End)
- Buffer->In = Buffer->Start;
-
- uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
- GlobalInterruptDisable();
-
- Buffer->Count++;
-
- SetGlobalInterruptMask(CurrentGlobalInt);
- }
-
- /** Removes an element from the ring buffer.
- *
- * \warning 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(RingBuffer_t* Buffer) ATTR_NON_NULL_PTR_ARG(1);
- static inline uint8_t RingBuffer_Remove(RingBuffer_t* Buffer)
- {
- GCC_FORCE_POINTER_ACCESS(Buffer);
-
- uint8_t Data = *Buffer->Out;
-
- if (++Buffer->Out == Buffer->End)
- Buffer->Out = Buffer->Start;
-
- uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
- GlobalInterruptDisable();
-
- Buffer->Count--;
-
- SetGlobalInterruptMask(CurrentGlobalInt);
-
- 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(RingBuffer_t* const Buffer) ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
- static inline uint8_t RingBuffer_Peek(RingBuffer_t* const Buffer)
- {
- return *Buffer->Out;
- }
-
- /* Disable C linkage for C++ Compilers: */
- #if defined(__cplusplus)
- }
- #endif
-
-#endif
-
-/** @} */
-
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