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551 lines
24 KiB
C
551 lines
24 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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void *pvDummy3[11];
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BaseType_t xDummy4;
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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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* @note For no-split/allow-split buffers, an xItemSize of 0 will result in
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* an item with no data being set (i.e., item only contains the header).
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* For byte buffers, an xItemSize of 0 will simply return pdTRUE without
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* copying any data.
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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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* @note For no-split/allow-split buffers, an xItemSize of 0 will result in
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* an item with no data being set (i.e., item only contains the header).
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* For byte buffers, an xItemSize of 0 will simply return pdTRUE without
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* copying any data.
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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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* @note An xItemSize of 0 will result in a buffer being acquired, but the buffer
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* will have a size of 0.
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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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* @note It is possible to receive items with a pxItemSize of 0 on no-split/allow split buffers.
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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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* @note It is possible to receive items with a pxItemSize of 0 on no-split/allow split buffers.
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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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* @note It is possible to receive items with a pxItemSize of 0 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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* @note It is possible to receive items with a pxItemSize of 0 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. Size of 0 simply returns NULL.
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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.
|
|
*
|
|
* @param[in] xRingbuffer Ring buffer to add to the queue set
|
|
* @param[in] xQueueSet Queue set to add the ring buffer to
|
|
*
|
|
* @return
|
|
* - pdTRUE on success, pdFALSE otherwise
|
|
*/
|
|
BaseType_t xRingbufferAddToQueueSetRead(RingbufHandle_t xRingbuffer, QueueSetHandle_t xQueueSet);
|
|
|
|
/**
|
|
* @brief Check if the selected queue set member is a particular ring buffer
|
|
*
|
|
* This API checks if queue set member returned from xQueueSelectFromSet() is
|
|
* a particular ring buffer. If so, this indicates the ring buffer has items
|
|
* waiting to be retrieved.
|
|
*
|
|
* @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 handle
|
|
* @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);
|
|
|
|
/**
|
|
* @brief Retrieve the pointers to a statically created ring buffer
|
|
*
|
|
* @param[in] xRingbuffer Ring buffer
|
|
* @param[out] ppucRingbufferStorage Used to return a pointer to the queue's storage area buffer
|
|
* @param[out] ppxStaticRingbuffer Used to return a pointer to the queue's data structure buffer
|
|
* @return pdTRUE if buffers were retrieved, pdFALSE otherwise.
|
|
*/
|
|
BaseType_t xRingbufferGetStaticBuffer(RingbufHandle_t xRingbuffer, uint8_t **ppucRingbufferStorage, StaticRingbuffer_t **ppxStaticRingbuffer);
|
|
|
|
/**
|
|
* @brief Creates a ring buffer with specific memory capabilities
|
|
*
|
|
* This function is similar to xRingbufferCreate(), except that it allows the
|
|
* memory allocated for the ring buffer to have specific capabilities (e.g.,
|
|
* MALLOC_CAP_INTERNAL).
|
|
*
|
|
* @note A queue created using this function must only be deleted using
|
|
* vRingbufferDeleteWithCaps()
|
|
* @param[in] xBufferSize Size of the buffer in bytes
|
|
* @param[in] xBufferType Type of ring buffer, see documentation.
|
|
* @param[in] uxMemoryCaps Memory capabilities of the queue's memory (see
|
|
* esp_heap_caps.h)
|
|
* @return Handle to the created ring buffer or NULL on failure.
|
|
*/
|
|
RingbufHandle_t xRingbufferCreateWithCaps(size_t xBufferSize, RingbufferType_t xBufferType, UBaseType_t uxMemoryCaps);
|
|
|
|
/**
|
|
* @brief Deletes a ring buffer previously created using xRingbufferCreateWithCaps()
|
|
*
|
|
* @param xRingbuffer Ring buffer
|
|
*/
|
|
void vRingbufferDeleteWithCaps(RingbufHandle_t xRingbuffer);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|