mirror of
https://github.com/espressif/esp-idf.git
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443d87c2ff
This commit replaces the existing TX/RX semaphores with FreeRTOS task event lists (similar to how FreeRTOS queues implement task blocking). Using task event lists allows the ring buffer object to be smaller and various ring buffer functions to be faster. The ring buffer queue set impelementation was also updated as a result.
505 lines
21 KiB
C
505 lines
21 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include "freertos/FreeRTOS.h"
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#include "freertos/queue.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Type by which ring buffers are referenced. For example, a call to xRingbufferCreate()
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* returns a RingbufHandle_t variable that can then be used as a parameter to
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* xRingbufferSend(), xRingbufferReceive(), etc.
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*/
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typedef void * RingbufHandle_t;
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typedef enum {
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/**
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* No-split buffers will only store an item in contiguous memory and will
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* never split an item. Each item requires an 8 byte overhead for a header
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* and will always internally occupy a 32-bit aligned size of space.
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*/
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RINGBUF_TYPE_NOSPLIT = 0,
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/**
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* Allow-split buffers will split an item into two parts if necessary in
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* order to store it. Each item requires an 8 byte overhead for a header,
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* splitting incurs an extra header. Each item will always internally occupy
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* a 32-bit aligned size of space.
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*/
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RINGBUF_TYPE_ALLOWSPLIT,
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/**
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* Byte buffers store data as a sequence of bytes and do not maintain separate
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* items, therefore byte buffers have no overhead. All data is stored as a
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* sequence of byte and any number of bytes can be sent or retrieved each
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* time.
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*/
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RINGBUF_TYPE_BYTEBUF,
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RINGBUF_TYPE_MAX,
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} RingbufferType_t;
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/**
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* @brief Struct that is equivalent in size to the ring buffer's data structure
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*
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* The contents of this struct are not meant to be used directly. This
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* structure is meant to be used when creating a statically allocated ring
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* buffer where this struct is of the exact size required to store a ring
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* buffer's control data structure.
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*
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*/
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typedef struct xSTATIC_RINGBUFFER {
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/** @cond */ //Doxygen command to hide this structure from API Reference
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size_t xDummy1[2];
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UBaseType_t uxDummy2;
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BaseType_t xDummy3;
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void *pvDummy4[11];
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StaticList_t xDummy5[2];
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void * pvDummy6;
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portMUX_TYPE muxDummy;
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/** @endcond */
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} StaticRingbuffer_t;
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/**
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* @brief Create a ring buffer
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*
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* @param[in] xBufferSize Size of the buffer in bytes. Note that items require
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* space for a header in no-split/allow-split buffers
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* @param[in] xBufferType Type of ring buffer, see documentation.
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*
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* @note xBufferSize of no-split/allow-split buffers will be rounded up to the nearest 32-bit aligned size.
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*
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* @return A handle to the created ring buffer, or NULL in case of error.
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*/
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RingbufHandle_t xRingbufferCreate(size_t xBufferSize, RingbufferType_t xBufferType);
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/**
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* @brief Create a ring buffer of type RINGBUF_TYPE_NOSPLIT for a fixed item_size
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*
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* This API is similar to xRingbufferCreate(), but it will internally allocate
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* additional space for the headers.
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*
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* @param[in] xItemSize Size of each item to be put into the ring buffer
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* @param[in] xItemNum Maximum number of items the buffer needs to hold simultaneously
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*
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* @return A RingbufHandle_t handle to the created ring buffer, or NULL in case of error.
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*/
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RingbufHandle_t xRingbufferCreateNoSplit(size_t xItemSize, size_t xItemNum);
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/**
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* @brief Create a ring buffer but manually provide the required memory
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*
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* @param[in] xBufferSize Size of the buffer in bytes.
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* @param[in] xBufferType Type of ring buffer, see documentation
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* @param[in] pucRingbufferStorage Pointer to the ring buffer's storage area.
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* Storage area must have the same size as specified by xBufferSize
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* @param[in] pxStaticRingbuffer Pointed to a struct of type StaticRingbuffer_t
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* which will be used to hold the ring buffer's data structure
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*
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* @note xBufferSize of no-split/allow-split buffers MUST be 32-bit aligned.
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*
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* @return A handle to the created ring buffer
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*/
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RingbufHandle_t xRingbufferCreateStatic(size_t xBufferSize,
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RingbufferType_t xBufferType,
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uint8_t *pucRingbufferStorage,
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StaticRingbuffer_t *pxStaticRingbuffer);
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/**
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* @brief Insert an item into the ring buffer
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*
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* Attempt to insert an item into the ring buffer. This function will block until
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* enough free space is available or until it times out.
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*
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* @param[in] xRingbuffer Ring buffer to insert the item into
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* @param[in] pvItem Pointer to data to insert. NULL is allowed if xItemSize is 0.
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* @param[in] xItemSize Size of data to insert.
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* @param[in] xTicksToWait Ticks to wait for room in the ring buffer.
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*
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* @note For no-split/allow-split ring buffers, the actual size of memory that
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* the item will occupy will be rounded up to the nearest 32-bit aligned
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* size. This is done to ensure all items are always stored in 32-bit
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* aligned fashion.
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*
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* @return
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* - pdTRUE if succeeded
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* - pdFALSE on time-out or when the data is larger than the maximum permissible size of the buffer
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*/
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BaseType_t xRingbufferSend(RingbufHandle_t xRingbuffer,
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const void *pvItem,
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size_t xItemSize,
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TickType_t xTicksToWait);
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/**
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* @brief Insert an item into the ring buffer in an ISR
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*
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* Attempt to insert an item into the ring buffer from an ISR. This function
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* will return immediately if there is insufficient free space in the buffer.
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*
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* @param[in] xRingbuffer Ring buffer to insert the item into
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* @param[in] pvItem Pointer to data to insert. NULL is allowed if xItemSize is 0.
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* @param[in] xItemSize Size of data to insert.
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* @param[out] pxHigherPriorityTaskWoken Value pointed to will be set to pdTRUE if the function woke up a higher priority task.
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*
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* @note For no-split/allow-split ring buffers, the actual size of memory that
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* the item will occupy will be rounded up to the nearest 32-bit aligned
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* size. This is done to ensure all items are always stored in 32-bit
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* aligned fashion.
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*
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* @return
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* - pdTRUE if succeeded
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* - pdFALSE when the ring buffer does not have space.
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*/
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BaseType_t xRingbufferSendFromISR(RingbufHandle_t xRingbuffer,
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const void *pvItem,
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size_t xItemSize,
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BaseType_t *pxHigherPriorityTaskWoken);
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/**
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* @brief Acquire memory from the ring buffer to be written to by an external
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* source and to be sent later.
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*
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* Attempt to allocate buffer for an item to be sent into the ring buffer. This
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* function will block until enough free space is available or until it
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* times out.
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*
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* The item, as well as the following items ``SendAcquire`` or ``Send`` after it,
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* will not be able to be read from the ring buffer until this item is actually
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* sent into the ring buffer.
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*
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* @param[in] xRingbuffer Ring buffer to allocate the memory
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* @param[out] ppvItem Double pointer to memory acquired (set to NULL if no memory were retrieved)
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* @param[in] xItemSize Size of item to acquire.
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* @param[in] xTicksToWait Ticks to wait for room in the ring buffer.
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*
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* @note Only applicable for no-split ring buffers now, the actual size of
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* memory that the item will occupy will be rounded up to the nearest 32-bit
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* aligned size. This is done to ensure all items are always stored in 32-bit
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* aligned fashion.
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*
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* @return
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* - pdTRUE if succeeded
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* - pdFALSE on time-out or when the data is larger than the maximum permissible size of the buffer
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*/
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BaseType_t xRingbufferSendAcquire(RingbufHandle_t xRingbuffer, void **ppvItem, size_t xItemSize, TickType_t xTicksToWait);
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/**
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* @brief Actually send an item into the ring buffer allocated before by
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* ``xRingbufferSendAcquire``.
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*
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* @param[in] xRingbuffer Ring buffer to insert the item into
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* @param[in] pvItem Pointer to item in allocated memory to insert.
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*
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* @note Only applicable for no-split ring buffers. Only call for items
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* allocated by ``xRingbufferSendAcquire``.
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*
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* @return
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* - pdTRUE if succeeded
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* - pdFALSE if fail for some reason.
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*/
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BaseType_t xRingbufferSendComplete(RingbufHandle_t xRingbuffer, void *pvItem);
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/**
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* @brief Retrieve an item from the ring buffer
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*
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* Attempt to retrieve an item from the ring buffer. This function will block
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* until an item is available or until it times out.
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*
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* @param[in] xRingbuffer Ring buffer to retrieve the item from
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* @param[out] pxItemSize Pointer to a variable to which the size of the retrieved item will be written.
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* @param[in] xTicksToWait Ticks to wait for items in the ring buffer.
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*
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* @note A call to vRingbufferReturnItem() is required after this to free the item retrieved.
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*
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* @return
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* - Pointer to the retrieved item on success; *pxItemSize filled with the length of the item.
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* - NULL on timeout, *pxItemSize is untouched in that case.
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*/
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void *xRingbufferReceive(RingbufHandle_t xRingbuffer, size_t *pxItemSize, TickType_t xTicksToWait);
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/**
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* @brief Retrieve an item from the ring buffer in an ISR
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*
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* Attempt to retrieve an item from the ring buffer. This function returns immediately
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* if there are no items available for retrieval
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*
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* @param[in] xRingbuffer Ring buffer to retrieve the item from
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* @param[out] pxItemSize Pointer to a variable to which the size of the
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* retrieved item will be written.
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*
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* @note A call to vRingbufferReturnItemFromISR() is required after this to free the item retrieved.
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* @note Byte buffers do not allow multiple retrievals before returning an item
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* @note Two calls to RingbufferReceiveFromISR() are required if the bytes wrap around the end of the ring buffer.
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*
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* @return
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* - Pointer to the retrieved item on success; *pxItemSize filled with the length of the item.
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* - NULL when the ring buffer is empty, *pxItemSize is untouched in that case.
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*/
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void *xRingbufferReceiveFromISR(RingbufHandle_t xRingbuffer, size_t *pxItemSize);
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/**
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* @brief Retrieve a split item from an allow-split ring buffer
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*
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* Attempt to retrieve a split item from an allow-split ring buffer. If the item
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* is not split, only a single item is retried. If the item is split, both parts
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* will be retrieved. This function will block until an item is available or
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* until it times out.
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*
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* @param[in] xRingbuffer Ring buffer to retrieve the item from
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* @param[out] ppvHeadItem Double pointer to first part (set to NULL if no items were retrieved)
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* @param[out] ppvTailItem Double pointer to second part (set to NULL if item is not split)
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* @param[out] pxHeadItemSize Pointer to size of first part (unmodified if no items were retrieved)
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* @param[out] pxTailItemSize Pointer to size of second part (unmodified if item is not split)
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* @param[in] xTicksToWait Ticks to wait for items in the ring buffer.
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*
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* @note Call(s) to vRingbufferReturnItem() is required after this to free up the item(s) retrieved.
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* @note This function should only be called on allow-split buffers
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*
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* @return
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* - pdTRUE if an item (split or unsplit) was retrieved
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* - pdFALSE when no item was retrieved
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*/
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BaseType_t xRingbufferReceiveSplit(RingbufHandle_t xRingbuffer,
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void **ppvHeadItem,
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void **ppvTailItem,
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size_t *pxHeadItemSize,
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size_t *pxTailItemSize,
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TickType_t xTicksToWait);
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/**
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* @brief Retrieve a split item from an allow-split ring buffer in an ISR
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*
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* Attempt to retrieve a split item from an allow-split ring buffer. If the item
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* is not split, only a single item is retried. If the item is split, both parts
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* will be retrieved. This function returns immediately if there are no items
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* available for retrieval
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*
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* @param[in] xRingbuffer Ring buffer to retrieve the item from
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* @param[out] ppvHeadItem Double pointer to first part (set to NULL if no items were retrieved)
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* @param[out] ppvTailItem Double pointer to second part (set to NULL if item is not split)
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* @param[out] pxHeadItemSize Pointer to size of first part (unmodified if no items were retrieved)
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* @param[out] pxTailItemSize Pointer to size of second part (unmodified if item is not split)
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*
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* @note Calls to vRingbufferReturnItemFromISR() is required after this to free up the item(s) retrieved.
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* @note This function should only be called on allow-split buffers
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*
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* @return
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* - pdTRUE if an item (split or unsplit) was retrieved
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* - pdFALSE when no item was retrieved
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*/
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BaseType_t xRingbufferReceiveSplitFromISR(RingbufHandle_t xRingbuffer,
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void **ppvHeadItem,
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void **ppvTailItem,
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size_t *pxHeadItemSize,
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size_t *pxTailItemSize);
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/**
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* @brief Retrieve bytes from a byte buffer, specifying the maximum amount of bytes to retrieve
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*
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* Attempt to retrieve data from a byte buffer whilst specifying a maximum number
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* of bytes to retrieve. This function will block until there is data available
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* for retrieval or until it times out.
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*
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* @param[in] xRingbuffer Ring buffer to retrieve the item from
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* @param[out] pxItemSize Pointer to a variable to which the size of the retrieved item will be written.
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* @param[in] xTicksToWait Ticks to wait for items in the ring buffer.
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* @param[in] xMaxSize Maximum number of bytes to return.
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*
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* @note A call to vRingbufferReturnItem() is required after this to free up the data retrieved.
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* @note This function should only be called on byte buffers
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* @note Byte buffers do not allow multiple retrievals before returning an item
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* @note Two calls to RingbufferReceiveUpTo() are required if the bytes wrap around the end of the ring buffer.
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*
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* @return
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* - Pointer to the retrieved item on success; *pxItemSize filled with
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* the length of the item.
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* - NULL on timeout, *pxItemSize is untouched in that case.
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*/
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void *xRingbufferReceiveUpTo(RingbufHandle_t xRingbuffer,
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size_t *pxItemSize,
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TickType_t xTicksToWait,
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size_t xMaxSize);
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/**
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* @brief Retrieve bytes from a byte buffer, specifying the maximum amount of
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* bytes to retrieve. Call this from an ISR.
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*
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* Attempt to retrieve bytes from a byte buffer whilst specifying a maximum number
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* of bytes to retrieve. This function will return immediately if there is no data
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* available for retrieval.
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*
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* @param[in] xRingbuffer Ring buffer to retrieve the item from
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* @param[out] pxItemSize Pointer to a variable to which the size of the retrieved item will be written.
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* @param[in] xMaxSize Maximum number of bytes to return.
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*
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* @note A call to vRingbufferReturnItemFromISR() is required after this to free up the data received.
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* @note This function should only be called on byte buffers
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* @note Byte buffers do not allow multiple retrievals before returning an item
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*
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* @return
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* - Pointer to the retrieved item on success; *pxItemSize filled with
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* the length of the item.
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* - NULL when the ring buffer is empty, *pxItemSize is untouched in that case.
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*/
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void *xRingbufferReceiveUpToFromISR(RingbufHandle_t xRingbuffer, size_t *pxItemSize, size_t xMaxSize);
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/**
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* @brief Return a previously-retrieved item to the ring buffer
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*
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* @param[in] xRingbuffer Ring buffer the item was retrieved from
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* @param[in] pvItem Item that was received earlier
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*
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* @note If a split item is retrieved, both parts should be returned by calling this function twice
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*/
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void vRingbufferReturnItem(RingbufHandle_t xRingbuffer, void *pvItem);
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/**
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* @brief Return a previously-retrieved item to the ring buffer from an ISR
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*
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* @param[in] xRingbuffer Ring buffer the item was retrieved from
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* @param[in] pvItem Item that was received earlier
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* @param[out] pxHigherPriorityTaskWoken Value pointed to will be set to pdTRUE
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* if the function woke up a higher priority task.
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*
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* @note If a split item is retrieved, both parts should be returned by calling this function twice
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*/
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void vRingbufferReturnItemFromISR(RingbufHandle_t xRingbuffer, void *pvItem, BaseType_t *pxHigherPriorityTaskWoken);
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/**
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* @brief Delete a ring buffer
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*
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* @param[in] xRingbuffer Ring buffer to delete
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*
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* @note This function will not deallocate any memory if the ring buffer was
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* created using xRingbufferCreateStatic(). Deallocation must be done
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* manually be the user.
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*/
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void vRingbufferDelete(RingbufHandle_t xRingbuffer);
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/**
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* @brief Get maximum size of an item that can be placed in the ring buffer
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*
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* This function returns the maximum size an item can have if it was placed in
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* an empty ring buffer.
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*
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* @param[in] xRingbuffer Ring buffer to query
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*
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* @note The max item size for a no-split buffer is limited to
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* ((buffer_size/2)-header_size). This limit is imposed so that an item
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* of max item size can always be sent to an empty no-split buffer
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* regardless of the internal positions of the buffer's read/write/free
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* pointers.
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*
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* @return Maximum size, in bytes, of an item that can be placed in a ring buffer.
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*/
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size_t xRingbufferGetMaxItemSize(RingbufHandle_t xRingbuffer);
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/**
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* @brief Get current free size available for an item/data in the buffer
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*
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* This gives the real time free space available for an item/data in the ring
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* buffer. This represents the maximum size an item/data can have if it was
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* currently sent to the ring buffer.
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*
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* @warning This API is not thread safe. So, if multiple threads are accessing
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* the same ring buffer, it is the application's responsibility to
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* ensure atomic access to this API and the subsequent Send
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*
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* @note An empty no-split buffer has a max current free size for an item
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* that is limited to ((buffer_size/2)-header_size). See API reference
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* for xRingbufferGetMaxItemSize().
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*
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* @param[in] xRingbuffer Ring buffer to query
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*
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* @return Current free size, in bytes, available for an entry
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*/
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size_t xRingbufferGetCurFreeSize(RingbufHandle_t xRingbuffer);
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/**
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* @brief Add the ring buffer to a queue set. Notified when data has been written to the ring buffer
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*
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* This function adds the ring buffer to a queue set, thus allowing a task to
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* block on multiple queues/ring buffers. The queue set is notified when the new
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* data becomes available to read on the ring buffer.
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*
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* @param[in] xRingbuffer Ring buffer to add to the queue set
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* @param[in] xQueueSet Queue set to add the ring buffer to
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*
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* @return
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* - pdTRUE on success, pdFALSE otherwise
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*/
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BaseType_t xRingbufferAddToQueueSetRead(RingbufHandle_t xRingbuffer, QueueSetHandle_t xQueueSet);
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/**
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* @brief Check if the selected queue set member is a particular ring buffer
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*
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* This API checks if queue set member returned from xQueueSelectFromSet() is
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* a particular ring buffer. If so, this indicates the ring buffer has items
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* waiting to be retrieved.
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*
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|
* @param[in] xRingbuffer Ring buffer to check
|
|
* @param[in] xMember Member returned from xQueueSelectFromSet
|
|
*
|
|
* @return
|
|
* - pdTRUE when selected queue set member is the ring buffer
|
|
* - pdFALSE otherwise.
|
|
*/
|
|
static inline BaseType_t xRingbufferCanRead(RingbufHandle_t xRingbuffer, QueueSetMemberHandle_t xMember)
|
|
{
|
|
return (xMember == (QueueSetMemberHandle_t)xRingbuffer) ? pdTRUE : pdFALSE;
|
|
}
|
|
|
|
/**
|
|
* @brief Remove the ring buffer from a queue set
|
|
*
|
|
* This function removes a ring buffer from a queue set. The ring buffer must have been previously added to the queue
|
|
* set using xRingbufferAddToQueueSetRead().
|
|
*
|
|
* @param[in] xRingbuffer Ring buffer to remove from the queue set
|
|
* @param[in] xQueueSet Queue set to remove the ring buffer from
|
|
*
|
|
* @return
|
|
* - pdTRUE on success
|
|
* - pdFALSE otherwise
|
|
*/
|
|
BaseType_t xRingbufferRemoveFromQueueSetRead(RingbufHandle_t xRingbuffer, QueueSetHandle_t xQueueSet);
|
|
|
|
/**
|
|
* @brief Get information about ring buffer status
|
|
*
|
|
* Get information of a ring buffer's current status such as
|
|
* free/read/write/acquire pointer positions, and number of items waiting to be retrieved.
|
|
* Arguments can be set to NULL if they are not required.
|
|
*
|
|
* @param[in] xRingbuffer Ring buffer to remove from the queue set
|
|
* @param[out] uxFree Pointer use to store free pointer position
|
|
* @param[out] uxRead Pointer use to store read pointer position
|
|
* @param[out] uxWrite Pointer use to store write pointer position
|
|
* @param[out] uxAcquire Pointer use to store acquire pointer position
|
|
* @param[out] uxItemsWaiting Pointer use to store number of items (bytes for byte buffer) waiting to be retrieved
|
|
*/
|
|
void vRingbufferGetInfo(RingbufHandle_t xRingbuffer,
|
|
UBaseType_t *uxFree,
|
|
UBaseType_t *uxRead,
|
|
UBaseType_t *uxWrite,
|
|
UBaseType_t *uxAcquire,
|
|
UBaseType_t *uxItemsWaiting);
|
|
|
|
/**
|
|
* @brief Debugging function to print the internal pointers in the ring buffer
|
|
*
|
|
* @param xRingbuffer Ring buffer to show
|
|
*/
|
|
void xRingbufferPrintInfo(RingbufHandle_t xRingbuffer);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|