The following 2 compiler warnings are only reproducible when setting: OPTIMIZATION_FLAGS = -Ofast esp-idf/components/soc/esp32/rtc_clk.c: In function 'rtc_clk_cpu_freq_get': esp-idf/components/soc/esp32/rtc_clk.c:506:12: error: 'freq' may be used uninitialized in this function [-Werror=maybe-uninitialized] return freq; esp-idf/components/esp_ringbuf/ringbuf.c: In function 'xRingbufferReceiveSplitFromISR': esp-idf/components/esp_ringbuf/ringbuf.c:934:26: error: 'pvTempTailItem' may be used uninitialized in this function [-Werror=maybe-uninitialized] *ppvTailItem = pvTempTailItem; Closes https://github.com/espressif/esp-idf/pull/2878
1184 lines
54 KiB
C
1184 lines
54 KiB
C
// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdlib.h>
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "freertos/ringbuf.h"
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//32-bit alignment macros
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#define rbALIGN_SIZE( xSize ) ( ( xSize + portBYTE_ALIGNMENT_MASK ) & ~portBYTE_ALIGNMENT_MASK )
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#define rbCHECK_ALIGNED( pvPtr ) ( ( ( UBaseType_t ) pvPtr & portBYTE_ALIGNMENT_MASK ) == 0 )
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//Ring buffer flags
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#define rbALLOW_SPLIT_FLAG ( ( UBaseType_t ) 1 ) //The ring buffer allows items to be split
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#define rbBYTE_BUFFER_FLAG ( ( UBaseType_t ) 2 ) //The ring buffer is a byte buffer
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#define rbBUFFER_FULL_FLAG ( ( UBaseType_t ) 4 ) //The ring buffer is currently full (write pointer == free pointer)
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//Item flags
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#define rbITEM_FREE_FLAG ( ( UBaseType_t ) 1 ) //Item has been retrieved and returned by application, free to overwrite
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#define rbITEM_DUMMY_DATA_FLAG ( ( UBaseType_t ) 2 ) //Data from here to end of the ring buffer is dummy data. Restart reading at start of head of the buffer
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#define rbITEM_SPLIT_FLAG ( ( UBaseType_t ) 4 ) //Valid for RINGBUF_TYPE_ALLOWSPLIT, indicating that rest of the data is wrapped around
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typedef struct {
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//This size of this structure must be 32-bit aligned
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size_t xItemLen;
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UBaseType_t uxItemFlags;
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} ItemHeader_t;
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#define rbHEADER_SIZE sizeof(ItemHeader_t)
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typedef struct Ringbuffer_t Ringbuffer_t;
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typedef BaseType_t (*CheckItemFitsFunction_t)(Ringbuffer_t *pxRingbuffer, size_t xItemSize);
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typedef void (*CopyItemFunction_t)(Ringbuffer_t *pxRingbuffer, const uint8_t *pcItem, size_t xItemSize);
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typedef BaseType_t (*CheckItemAvailFunction_t) (Ringbuffer_t *pxRingbuffer);
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typedef void *(*GetItemFunction_t)(Ringbuffer_t *pxRingbuffer, BaseType_t *pxIsSplit, size_t xMaxSize, size_t *pxItemSize);
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typedef void (*ReturnItemFunction_t)(Ringbuffer_t *pxRingbuffer, uint8_t *pvItem);
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typedef size_t (*GetCurMaxSizeFunction_t)(Ringbuffer_t *pxRingbuffer);
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struct Ringbuffer_t {
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size_t xSize; //Size of the data storage
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UBaseType_t uxRingbufferFlags; //Flags to indicate the type and status of ring buffer
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size_t xMaxItemSize; //Maximum item size
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CheckItemFitsFunction_t xCheckItemFits; //Function to check if item can currently fit in ring buffer
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CopyItemFunction_t vCopyItem; //Function to copy item to ring buffer
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GetItemFunction_t pvGetItem; //Function to get item from ring buffer
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ReturnItemFunction_t vReturnItem; //Function to return item to ring buffer
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GetCurMaxSizeFunction_t xGetCurMaxSize; //Function to get current free size
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uint8_t *pucWrite; //Write Pointer. Points to where the next item should be written
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uint8_t *pucRead; //Read Pointer. Points to where the next item should be read from
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uint8_t *pucFree; //Free Pointer. Points to the last item that has yet to be returned to the ring buffer
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uint8_t *pucHead; //Pointer to the start of the ring buffer storage area
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uint8_t *pucTail; //Pointer to the end of the ring buffer storage area
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BaseType_t xItemsWaiting; //Number of items/bytes(for byte buffers) currently in ring buffer that have not yet been read
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SemaphoreHandle_t xFreeSpaceSemaphore; //Binary semaphore, wakes up writing threads when more free space becomes available or when another thread times out attempting to write
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SemaphoreHandle_t xItemsBufferedSemaphore; //Binary semaphore, indicates there are new packets in the circular buffer. See remark.
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portMUX_TYPE mux; //Spinlock required for SMP
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};
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/*
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Remark: A counting semaphore for items_buffered_sem would be more logical, but counting semaphores in
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FreeRTOS need a maximum count, and allocate more memory the larger the maximum count is. Here, we
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would need to set the maximum to the maximum amount of times a null-byte unit first in the buffer,
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which is quite high and so would waste a fair amount of memory.
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*/
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/* ------------------------------------------------ Static Declarations ------------------------------------------ */
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/*
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* WARNING: All of the following static functions (except generic functions)
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* ARE NOT THREAD SAFE. Therefore they should only be called within a critical
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* section (using spin locks)
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*/
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//Calculate current amount of free space (in bytes) in the ring buffer
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static size_t prvGetFreeSize(Ringbuffer_t *pxRingbuffer);
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//Checks if an item/data is currently available for retrieval
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static BaseType_t prvCheckItemAvail(Ringbuffer_t *pxRingbuffer);
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//Checks if an item will currently fit in a no-split/allow-split ring buffer
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static BaseType_t prvCheckItemFitsDefault( Ringbuffer_t *pxRingbuffer, size_t xItemSize);
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//Checks if an item will currently fit in a byte buffer
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static BaseType_t prvCheckItemFitsByteBuffer( Ringbuffer_t *pxRingbuffer, size_t xItemSize);
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//Copies an item to a no-split ring buffer. Only call this function after calling prvCheckItemFitsDefault()
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static void prvCopyItemNoSplit(Ringbuffer_t *pxRingbuffer, const uint8_t *pucItem, size_t xItemSize);
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//Copies an item to a allow-split ring buffer. Only call this function after calling prvCheckItemFitsDefault()
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static void prvCopyItemAllowSplit(Ringbuffer_t *pxRingbuffer, const uint8_t *pucItem, size_t xItemSize);
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//Copies an item to a byte buffer. Only call this function after calling prvCheckItemFitsByteBuffer()
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static void prvCopyItemByteBuf(Ringbuffer_t *pxRingbuffer, const uint8_t *pucItem, size_t xItemSize);
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//Retrieve item from no-split/allow-split ring buffer. *pxIsSplit is set to pdTRUE if the retrieved item is split
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static void *prvGetItemDefault(Ringbuffer_t *pxRingbuffer, BaseType_t *pxIsSplit, size_t xUnusedParam, size_t *pxItemSize);
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//Retrieve data from byte buffer. If xMaxSize is 0, all continuous data is retrieved
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static void *prvGetItemByteBuf(Ringbuffer_t *pxRingbuffer, BaseType_t *pxUnusedParam ,size_t xMaxSize, size_t *pxItemSize);
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//Return an item to a split/no-split ring buffer
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static void prvReturnItemDefault(Ringbuffer_t *pxRingbuffer, uint8_t *pucItem);
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//Return data to a byte buffer
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static void prvReturnItemByteBuf(Ringbuffer_t *pxRingbuffer, uint8_t *pucItem);
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//Get the maximum size an item that can currently have if sent to a no-split ring buffer
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static size_t prvGetCurMaxSizeNoSplit(Ringbuffer_t *pxRingbuffer);
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//Get the maximum size an item that can currently have if sent to a allow-split ring buffer
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static size_t prvGetCurMaxSizeAllowSplit(Ringbuffer_t *pxRingbuffer);
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//Get the maximum size an item that can currently have if sent to a byte buffer
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static size_t prvGetCurMaxSizeByteBuf(Ringbuffer_t *pxRingbuffer);
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/**
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* Generic function used to retrieve an item/data from ring buffers. If called on
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* an allow-split buffer, and pvItem2 and xItemSize2 are not NULL, both parts of
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* a split item will be retrieved. xMaxSize will only take effect if called on
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* byte buffers.
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*/
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static BaseType_t prvReceiveGeneric(Ringbuffer_t *pxRingbuffer, void **pvItem1, void **pvItem2, size_t *xItemSize1, size_t *xItemSize2, size_t xMaxSize, TickType_t xTicksToWait);
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//Generic function used to retrieve an item/data from ring buffers in an ISR
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static BaseType_t prvReceiveGenericFromISR(Ringbuffer_t *pxRingbuffer, void **pvItem1, void **pvItem2, size_t *xItemSize1, size_t *xItemSize2, size_t xMaxSize);
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/* ------------------------------------------------ Static Definitions ------------------------------------------- */
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static size_t prvGetFreeSize(Ringbuffer_t *pxRingbuffer)
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{
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size_t xReturn;
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if (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) {
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xReturn = 0;
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} else {
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BaseType_t xFreeSize = pxRingbuffer->pucFree - pxRingbuffer->pucWrite;
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//Check if xFreeSize has underflowed
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if (xFreeSize <= 0) {
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xFreeSize += pxRingbuffer->xSize;
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}
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xReturn = xFreeSize;
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}
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configASSERT(xReturn <= pxRingbuffer->xSize);
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return xReturn;
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}
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static BaseType_t prvCheckItemFitsDefault( Ringbuffer_t *pxRingbuffer, size_t xItemSize)
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{
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//Check arguments and buffer state
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configASSERT(rbCHECK_ALIGNED(pxRingbuffer->pucWrite)); //pucWrite is always aligned in no-split ring buffers
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configASSERT(pxRingbuffer->pucWrite >= pxRingbuffer->pucHead && pxRingbuffer->pucWrite < pxRingbuffer->pucTail); //Check write pointer is within bounds
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size_t xTotalItemSize = rbALIGN_SIZE(xItemSize) + rbHEADER_SIZE; //Rounded up aligned item size with header
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if (pxRingbuffer->pucWrite == pxRingbuffer->pucFree) {
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//Buffer is either complete empty or completely full
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return (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) ? pdFALSE : pdTRUE;
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}
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if (pxRingbuffer->pucFree > pxRingbuffer->pucWrite) {
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//Free space does not wrap around
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return (xTotalItemSize <= pxRingbuffer->pucFree - pxRingbuffer->pucWrite) ? pdTRUE : pdFALSE;
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}
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//Free space wraps around
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if (xTotalItemSize <= pxRingbuffer->pucTail - pxRingbuffer->pucWrite) {
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return pdTRUE; //Item fits without wrapping around
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}
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//Check if item fits by wrapping
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if (pxRingbuffer->uxRingbufferFlags & rbALLOW_SPLIT_FLAG) {
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//Allow split wrapping incurs an extra header
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return (xTotalItemSize + rbHEADER_SIZE <= pxRingbuffer->xSize - (pxRingbuffer->pucWrite - pxRingbuffer->pucFree)) ? pdTRUE : pdFALSE;
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} else {
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return (xTotalItemSize <= pxRingbuffer->pucFree - pxRingbuffer->pucHead) ? pdTRUE : pdFALSE;
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}
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}
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static BaseType_t prvCheckItemFitsByteBuffer( Ringbuffer_t *pxRingbuffer, size_t xItemSize)
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{
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//Check arguments and buffer state
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configASSERT(pxRingbuffer->pucWrite >= pxRingbuffer->pucHead && pxRingbuffer->pucWrite < pxRingbuffer->pucTail); //Check write pointer is within bounds
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if (pxRingbuffer->pucWrite == pxRingbuffer->pucFree) {
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//Buffer is either complete empty or completely full
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return (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) ? pdFALSE : pdTRUE;
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}
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if (pxRingbuffer->pucFree > pxRingbuffer->pucWrite) {
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//Free space does not wrap around
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return (xItemSize <= pxRingbuffer->pucFree - pxRingbuffer->pucWrite) ? pdTRUE : pdFALSE;
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}
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//Free space wraps around
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return (xItemSize <= pxRingbuffer->xSize - (pxRingbuffer->pucWrite - pxRingbuffer->pucFree)) ? pdTRUE : pdFALSE;
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}
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static void prvCopyItemNoSplit(Ringbuffer_t *pxRingbuffer, const uint8_t *pucItem, size_t xItemSize)
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{
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//Check arguments and buffer state
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size_t xAlignedItemSize = rbALIGN_SIZE(xItemSize); //Rounded up aligned item size
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size_t xRemLen = pxRingbuffer->pucTail - pxRingbuffer->pucWrite; //Length from pucWrite until end of buffer
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configASSERT(rbCHECK_ALIGNED(pxRingbuffer->pucWrite)); //pucWrite is always aligned in no-split ring buffers
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configASSERT(pxRingbuffer->pucWrite >= pxRingbuffer->pucHead && pxRingbuffer->pucWrite < pxRingbuffer->pucTail); //Check write pointer is within bounds
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configASSERT(xRemLen >= rbHEADER_SIZE); //Remaining length must be able to at least fit an item header
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//If remaining length can't fit item, set as dummy data and wrap around
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if (xRemLen < xAlignedItemSize + rbHEADER_SIZE) {
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ItemHeader_t *pxDummy = (ItemHeader_t *)pxRingbuffer->pucWrite;
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pxDummy->uxItemFlags = rbITEM_DUMMY_DATA_FLAG; //Set remaining length as dummy data
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pxDummy->xItemLen = 0; //Dummy data should have no length
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pxRingbuffer->pucWrite = pxRingbuffer->pucHead; //Reset write pointer to wrap around
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}
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//Item should be guaranteed to fit at this point. Set item header and copy data
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ItemHeader_t *pxHeader = (ItemHeader_t *)pxRingbuffer->pucWrite;
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pxHeader->xItemLen = xItemSize;
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pxHeader->uxItemFlags = 0;
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pxRingbuffer->pucWrite += rbHEADER_SIZE; //Advance pucWrite past header
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memcpy(pxRingbuffer->pucWrite, pucItem, xItemSize);
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pxRingbuffer->xItemsWaiting++;
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pxRingbuffer->pucWrite += xAlignedItemSize; //Advance pucWrite past item to next aligned address
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//If current remaining length can't fit a header, wrap around write pointer
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if (pxRingbuffer->pucTail - pxRingbuffer->pucWrite < rbHEADER_SIZE) {
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pxRingbuffer->pucWrite = pxRingbuffer->pucHead; //Wrap around pucWrite
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}
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//Check if buffer is full
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if (pxRingbuffer->pucWrite == pxRingbuffer->pucFree) {
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//Mark the buffer as full to distinguish with an empty buffer
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pxRingbuffer->uxRingbufferFlags |= rbBUFFER_FULL_FLAG;
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}
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}
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static void prvCopyItemAllowSplit(Ringbuffer_t *pxRingbuffer, const uint8_t *pucItem, size_t xItemSize)
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{
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//Check arguments and buffer state
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size_t xAlignedItemSize = rbALIGN_SIZE(xItemSize); //Rounded up aligned item size
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size_t xRemLen = pxRingbuffer->pucTail - pxRingbuffer->pucWrite; //Length from pucWrite until end of buffer
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configASSERT(rbCHECK_ALIGNED(pxRingbuffer->pucWrite)); //pucWrite is always aligned in split ring buffers
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configASSERT(pxRingbuffer->pucWrite >= pxRingbuffer->pucHead && pxRingbuffer->pucWrite < pxRingbuffer->pucTail); //Check write pointer is within bounds
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configASSERT(xRemLen >= rbHEADER_SIZE); //Remaining length must be able to at least fit an item header
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//Split item if necessary
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if (xRemLen < xAlignedItemSize + rbHEADER_SIZE) {
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//Write first part of the item
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ItemHeader_t *pxFirstHeader = (ItemHeader_t *)pxRingbuffer->pucWrite;
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pxFirstHeader->uxItemFlags = 0;
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pxFirstHeader->xItemLen = xRemLen - rbHEADER_SIZE; //Fill remaining length with first part
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pxRingbuffer->pucWrite += rbHEADER_SIZE; //Advance pucWrite past header
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xRemLen -= rbHEADER_SIZE;
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if (xRemLen > 0) {
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memcpy(pxRingbuffer->pucWrite, pucItem, xRemLen);
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pxRingbuffer->xItemsWaiting++;
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//Update item arguments to account for data already copied
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pucItem += xRemLen;
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xItemSize -= xRemLen;
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xAlignedItemSize -= xRemLen;
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pxFirstHeader->uxItemFlags |= rbITEM_SPLIT_FLAG; //There must be more data
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} else {
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//Remaining length was only large enough to fit header
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pxFirstHeader->uxItemFlags |= rbITEM_DUMMY_DATA_FLAG; //Item will completely be stored in 2nd part
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}
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pxRingbuffer->pucWrite = pxRingbuffer->pucHead; //Reset write pointer to start of buffer
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}
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//Item (whole or second part) should be guaranteed to fit at this point
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ItemHeader_t *pxSecondHeader = (ItemHeader_t *)pxRingbuffer->pucWrite;
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pxSecondHeader->xItemLen = xItemSize;
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pxSecondHeader->uxItemFlags = 0;
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pxRingbuffer->pucWrite += rbHEADER_SIZE; //Advance write pointer past header
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memcpy(pxRingbuffer->pucWrite, pucItem, xItemSize);
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pxRingbuffer->xItemsWaiting++;
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pxRingbuffer->pucWrite += xAlignedItemSize; //Advance pucWrite past item to next aligned address
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//If current remaining length can't fit a header, wrap around write pointer
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if (pxRingbuffer->pucTail - pxRingbuffer->pucWrite < rbHEADER_SIZE) {
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pxRingbuffer->pucWrite = pxRingbuffer->pucHead; //Wrap around pucWrite
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}
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//Check if buffer is full
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if (pxRingbuffer->pucWrite == pxRingbuffer->pucFree) {
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//Mark the buffer as full to distinguish with an empty buffer
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pxRingbuffer->uxRingbufferFlags |= rbBUFFER_FULL_FLAG;
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}
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}
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static void prvCopyItemByteBuf(Ringbuffer_t *pxRingbuffer, const uint8_t *pucItem, size_t xItemSize)
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{
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//Check arguments and buffer state
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configASSERT(pxRingbuffer->pucWrite >= pxRingbuffer->pucHead && pxRingbuffer->pucWrite < pxRingbuffer->pucTail); //Check write pointer is within bounds
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size_t xRemLen = pxRingbuffer->pucTail - pxRingbuffer->pucWrite; //Length from pucWrite until end of buffer
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if (xRemLen < xItemSize) {
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//Copy as much as possible into remaining length
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memcpy(pxRingbuffer->pucWrite, pucItem, xRemLen);
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pxRingbuffer->xItemsWaiting += xRemLen;
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//Update item arguments to account for data already written
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pucItem += xRemLen;
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xItemSize -= xRemLen;
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pxRingbuffer->pucWrite = pxRingbuffer->pucHead; //Reset write pointer to start of buffer
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}
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//Copy all or remaining portion of the item
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memcpy(pxRingbuffer->pucWrite, pucItem, xItemSize);
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pxRingbuffer->xItemsWaiting += xItemSize;
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pxRingbuffer->pucWrite += xItemSize;
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//Wrap around pucWrite if it reaches the end
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if (pxRingbuffer->pucWrite == pxRingbuffer->pucTail) {
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pxRingbuffer->pucWrite = pxRingbuffer->pucHead;
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}
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//Check if buffer is full
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if (pxRingbuffer->pucWrite == pxRingbuffer->pucFree) {
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pxRingbuffer->uxRingbufferFlags |= rbBUFFER_FULL_FLAG; //Mark the buffer as full to avoid confusion with an empty buffer
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}
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}
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static BaseType_t prvCheckItemAvail(Ringbuffer_t *pxRingbuffer)
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{
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if ((pxRingbuffer->uxRingbufferFlags & rbBYTE_BUFFER_FLAG) && pxRingbuffer->pucRead != pxRingbuffer->pucFree) {
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return pdFALSE; //Byte buffers do not allow multiple retrievals before return
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}
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if ((pxRingbuffer->xItemsWaiting > 0) && ((pxRingbuffer->pucRead != pxRingbuffer->pucWrite) || (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG))) {
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return pdTRUE; //Items/data available for retrieval
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} else {
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return pdFALSE; //No items/data available for retrieval
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}
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}
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static void *prvGetItemDefault(Ringbuffer_t *pxRingbuffer, BaseType_t *pxIsSplit, size_t xUnusedParam, size_t *pxItemSize)
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{
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//Check arguments and buffer state
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ItemHeader_t *pxHeader = (ItemHeader_t *)pxRingbuffer->pucRead;
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configASSERT(pxIsSplit != NULL);
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configASSERT((pxRingbuffer->xItemsWaiting > 0) && ((pxRingbuffer->pucRead != pxRingbuffer->pucWrite) || (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG))); //Check there are items to be read
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configASSERT(rbCHECK_ALIGNED(pxRingbuffer->pucRead)); //pucRead is always aligned in split ring buffers
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configASSERT(pxRingbuffer->pucRead >= pxRingbuffer->pucHead && pxRingbuffer->pucRead < pxRingbuffer->pucTail); //Check read pointer is within bounds
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configASSERT((pxHeader->xItemLen <= pxRingbuffer->xMaxItemSize) || (pxHeader->uxItemFlags & rbITEM_DUMMY_DATA_FLAG));
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uint8_t *pcReturn;
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//Wrap around if dummy data (dummy data indicates wrap around in no-split buffers)
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if (pxHeader->uxItemFlags & rbITEM_DUMMY_DATA_FLAG) {
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pxRingbuffer->pucRead = pxRingbuffer->pucHead;
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//Check for errors with the next item
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pxHeader = (ItemHeader_t *)pxRingbuffer->pucRead;
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configASSERT(pxHeader->xItemLen <= pxRingbuffer->xMaxItemSize);
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}
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pcReturn = pxRingbuffer->pucRead + rbHEADER_SIZE; //Get pointer to part of item containing data (point past the header)
|
|
if (pxHeader->xItemLen == 0) {
|
|
//Inclusive of pucTail for special case where item of zero length just fits at the end of the buffer
|
|
configASSERT(pcReturn >= pxRingbuffer->pucHead && pcReturn <= pxRingbuffer->pucTail);
|
|
} else {
|
|
//Exclusive of pucTali if length is larger than zero, pcReturn should never point to pucTail
|
|
configASSERT(pcReturn >= pxRingbuffer->pucHead && pcReturn < pxRingbuffer->pucTail);
|
|
}
|
|
*pxItemSize = pxHeader->xItemLen; //Get length of item
|
|
pxRingbuffer->xItemsWaiting --; //Update item count
|
|
*pxIsSplit = (pxHeader->uxItemFlags & rbITEM_SPLIT_FLAG) ? pdTRUE : pdFALSE;
|
|
|
|
pxRingbuffer->pucRead += rbHEADER_SIZE + rbALIGN_SIZE(pxHeader->xItemLen); //Update pucRead
|
|
//Check if pucRead requires wrap around
|
|
if ((pxRingbuffer->pucTail - pxRingbuffer->pucRead) < rbHEADER_SIZE) {
|
|
pxRingbuffer->pucRead = pxRingbuffer->pucHead;
|
|
}
|
|
return (void *)pcReturn;
|
|
}
|
|
|
|
static void *prvGetItemByteBuf(Ringbuffer_t *pxRingbuffer, BaseType_t *pxUnusedParam ,size_t xMaxSize, size_t *pxItemSize)
|
|
{
|
|
//Check arguments and buffer state
|
|
configASSERT((pxRingbuffer->xItemsWaiting > 0) && ((pxRingbuffer->pucRead != pxRingbuffer->pucWrite) || (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG))); //Check there are items to be read
|
|
configASSERT(pxRingbuffer->pucRead >= pxRingbuffer->pucHead && pxRingbuffer->pucRead < pxRingbuffer->pucTail); //Check read pointer is within bounds
|
|
configASSERT(pxRingbuffer->pucRead == pxRingbuffer->pucFree);
|
|
|
|
uint8_t *ret = pxRingbuffer->pucRead;
|
|
if ((pxRingbuffer->pucRead > pxRingbuffer->pucWrite) || (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG)) { //Available data wraps around
|
|
//Return contiguous piece from read pointer until buffer tail, or xMaxSize
|
|
if (xMaxSize == 0 || pxRingbuffer->pucTail - pxRingbuffer->pucRead <= xMaxSize) {
|
|
//All contiguous data from read pointer to tail
|
|
*pxItemSize = pxRingbuffer->pucTail - pxRingbuffer->pucRead;
|
|
pxRingbuffer->xItemsWaiting -= pxRingbuffer->pucTail - pxRingbuffer->pucRead;
|
|
pxRingbuffer->pucRead = pxRingbuffer->pucHead; //Wrap around read pointer
|
|
} else {
|
|
//Return xMaxSize amount of data
|
|
*pxItemSize = xMaxSize;
|
|
pxRingbuffer->xItemsWaiting -= xMaxSize;
|
|
pxRingbuffer->pucRead += xMaxSize; //Advance read pointer past retrieved data
|
|
}
|
|
} else { //Available data is contiguous between read and write pointer
|
|
if (xMaxSize == 0 || pxRingbuffer->pucWrite - pxRingbuffer->pucRead <= xMaxSize) {
|
|
//Return all contiguous data from read to write pointer
|
|
*pxItemSize = pxRingbuffer->pucWrite - pxRingbuffer->pucRead;
|
|
pxRingbuffer->xItemsWaiting -= pxRingbuffer->pucWrite - pxRingbuffer->pucRead;
|
|
pxRingbuffer->pucRead = pxRingbuffer->pucWrite;
|
|
} else {
|
|
//Return xMaxSize data from read pointer
|
|
*pxItemSize = xMaxSize;
|
|
pxRingbuffer->xItemsWaiting -= xMaxSize;
|
|
pxRingbuffer->pucRead += xMaxSize; //Advance read pointer past retrieved data
|
|
|
|
}
|
|
}
|
|
return (void *)ret;
|
|
}
|
|
|
|
static void prvReturnItemDefault(Ringbuffer_t *pxRingbuffer, uint8_t *pucItem)
|
|
{
|
|
//Check arguments and buffer state
|
|
configASSERT(rbCHECK_ALIGNED(pucItem));
|
|
configASSERT(pucItem >= pxRingbuffer->pucHead);
|
|
configASSERT(pucItem <= pxRingbuffer->pucTail); //Inclusive of pucTail in the case of zero length item at the very end
|
|
|
|
//Get and check header of the item
|
|
ItemHeader_t *pxCurHeader = (ItemHeader_t *)(pucItem - rbHEADER_SIZE);
|
|
configASSERT(pxCurHeader->xItemLen <= pxRingbuffer->xMaxItemSize);
|
|
configASSERT((pxCurHeader->uxItemFlags & rbITEM_DUMMY_DATA_FLAG) == 0); //Dummy items should never have been read
|
|
configASSERT((pxCurHeader->uxItemFlags & rbITEM_FREE_FLAG) == 0); //Indicates item has already been returned before
|
|
pxCurHeader->uxItemFlags &= ~rbITEM_SPLIT_FLAG; //Clear wrap flag if set (not strictly necessary)
|
|
pxCurHeader->uxItemFlags |= rbITEM_FREE_FLAG; //Mark as free
|
|
|
|
/*
|
|
* Items might not be returned in the order they were retrieved. Move the free pointer
|
|
* up to the next item that has not been marked as free (by free flag) or up
|
|
* till the read pointer. When advancing the free pointer, items that have already been
|
|
* freed or items with dummy data should be skipped over
|
|
*/
|
|
pxCurHeader = (ItemHeader_t *)pxRingbuffer->pucFree;
|
|
//Skip over Items that have already been freed or are dummy items
|
|
while (((pxCurHeader->uxItemFlags & rbITEM_FREE_FLAG) || (pxCurHeader->uxItemFlags & rbITEM_DUMMY_DATA_FLAG)) && pxRingbuffer->pucFree != pxRingbuffer->pucRead) {
|
|
if (pxCurHeader->uxItemFlags & rbITEM_DUMMY_DATA_FLAG) {
|
|
pxCurHeader->uxItemFlags |= rbITEM_FREE_FLAG; //Mark as freed (not strictly necessary but adds redundancy)
|
|
pxRingbuffer->pucFree = pxRingbuffer->pucHead; //Wrap around due to dummy data
|
|
} else {
|
|
//Item with data that has already been freed, advance free pointer past this item
|
|
size_t xAlignedItemSize = rbALIGN_SIZE(pxCurHeader->xItemLen);
|
|
pxRingbuffer->pucFree += xAlignedItemSize + rbHEADER_SIZE;
|
|
//Redundancy check to ensure free pointer has not overshot buffer bounds
|
|
configASSERT(pxRingbuffer->pucFree <= pxRingbuffer->pucHead + pxRingbuffer->xSize);
|
|
}
|
|
//Check if pucRead requires wrap around
|
|
if ((pxRingbuffer->pucTail - pxRingbuffer->pucFree) < rbHEADER_SIZE) {
|
|
pxRingbuffer->pucFree = pxRingbuffer->pucHead;
|
|
}
|
|
pxCurHeader = (ItemHeader_t *)pxRingbuffer->pucFree; //Update header to point to item
|
|
}
|
|
|
|
//Check if the buffer full flag should be reset
|
|
if (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) {
|
|
if (pxRingbuffer->pucFree != pxRingbuffer->pucWrite) {
|
|
pxRingbuffer->uxRingbufferFlags &= ~rbBUFFER_FULL_FLAG;
|
|
} else if (pxRingbuffer->pucFree == pxRingbuffer->pucWrite && pxRingbuffer->pucFree == pxRingbuffer->pucRead) {
|
|
//Special case where a full buffer is completely freed in one go
|
|
pxRingbuffer->uxRingbufferFlags &= ~rbBUFFER_FULL_FLAG;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void prvReturnItemByteBuf(Ringbuffer_t *pxRingbuffer, uint8_t *pucItem)
|
|
{
|
|
//Check pointer points to address inside buffer
|
|
configASSERT((uint8_t *)pucItem >= pxRingbuffer->pucHead);
|
|
configASSERT((uint8_t *)pucItem < pxRingbuffer->pucTail);
|
|
//Free the read memory. Simply moves free pointer to read pointer as byte buffers do not allow multiple outstanding reads
|
|
pxRingbuffer->pucFree = pxRingbuffer->pucRead;
|
|
//If buffer was full before, reset full flag as free pointer has moved
|
|
if (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) {
|
|
pxRingbuffer->uxRingbufferFlags &= ~rbBUFFER_FULL_FLAG;
|
|
}
|
|
}
|
|
|
|
static size_t prvGetCurMaxSizeNoSplit(Ringbuffer_t *pxRingbuffer)
|
|
{
|
|
BaseType_t xFreeSize;
|
|
//Check if buffer is full
|
|
if (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) {
|
|
return 0;
|
|
}
|
|
if (pxRingbuffer->pucWrite < pxRingbuffer->pucFree) {
|
|
//Free space is contiguous between pucWrite and pucFree
|
|
xFreeSize = pxRingbuffer->pucFree - pxRingbuffer->pucWrite;
|
|
} else {
|
|
//Free space wraps around (or overlapped at pucHead), select largest
|
|
//contiguous free space as no-split items require contiguous space
|
|
size_t xSize1 = pxRingbuffer->pucTail - pxRingbuffer->pucWrite;
|
|
size_t xSize2 = pxRingbuffer->pucFree - pxRingbuffer->pucHead;
|
|
xFreeSize = (xSize1 > xSize2) ? xSize1 : xSize2;
|
|
}
|
|
|
|
//No-split ring buffer items need space for a header
|
|
xFreeSize -= rbHEADER_SIZE;
|
|
//Limit free size to be within bounds
|
|
if (xFreeSize > pxRingbuffer->xMaxItemSize) {
|
|
xFreeSize = pxRingbuffer->xMaxItemSize;
|
|
} else if (xFreeSize < 0) {
|
|
//Occurs when free space is less than header size
|
|
xFreeSize = 0;
|
|
}
|
|
return xFreeSize;
|
|
}
|
|
|
|
static size_t prvGetCurMaxSizeAllowSplit(Ringbuffer_t *pxRingbuffer)
|
|
{
|
|
BaseType_t xFreeSize;
|
|
//Check if buffer is full
|
|
if (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) {
|
|
return 0;
|
|
}
|
|
if (pxRingbuffer->pucWrite == pxRingbuffer->pucHead && pxRingbuffer->pucFree == pxRingbuffer->pucHead) {
|
|
//Check for special case where pucWrite and pucFree are both at pucHead
|
|
xFreeSize = pxRingbuffer->xSize - rbHEADER_SIZE;
|
|
} else if (pxRingbuffer->pucWrite < pxRingbuffer->pucFree) {
|
|
//Free space is contiguous between pucWrite and pucFree, requires single header
|
|
xFreeSize = (pxRingbuffer->pucFree - pxRingbuffer->pucWrite) - rbHEADER_SIZE;
|
|
} else {
|
|
//Free space wraps around, requires two headers
|
|
xFreeSize = (pxRingbuffer->pucFree - pxRingbuffer->pucHead) +
|
|
(pxRingbuffer->pucTail - pxRingbuffer->pucWrite) -
|
|
(rbHEADER_SIZE * 2);
|
|
}
|
|
|
|
//Limit free size to be within bounds
|
|
if (xFreeSize > pxRingbuffer->xMaxItemSize) {
|
|
xFreeSize = pxRingbuffer->xMaxItemSize;
|
|
} else if (xFreeSize < 0) {
|
|
xFreeSize = 0;
|
|
}
|
|
return xFreeSize;
|
|
}
|
|
|
|
static size_t prvGetCurMaxSizeByteBuf(Ringbuffer_t *pxRingbuffer)
|
|
{
|
|
BaseType_t xFreeSize;
|
|
//Check if buffer is full
|
|
if (pxRingbuffer->uxRingbufferFlags & rbBUFFER_FULL_FLAG) {
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return whatever space is available depending on relative positions of the free
|
|
* pointer and write pointer. There is no overhead of headers in this mode
|
|
*/
|
|
xFreeSize = pxRingbuffer->pucFree - pxRingbuffer->pucWrite;
|
|
if (xFreeSize <= 0) {
|
|
xFreeSize += pxRingbuffer->xSize;
|
|
}
|
|
return xFreeSize;
|
|
}
|
|
|
|
static BaseType_t prvReceiveGeneric(Ringbuffer_t *pxRingbuffer, void **pvItem1, void **pvItem2, size_t *xItemSize1, size_t *xItemSize2, size_t xMaxSize, TickType_t xTicksToWait)
|
|
{
|
|
BaseType_t xReturn = pdFALSE;
|
|
BaseType_t xReturnSemaphore = pdFALSE;
|
|
TickType_t xTicksEnd = xTaskGetTickCount() + xTicksToWait;
|
|
TickType_t xTicksRemaining = xTicksToWait;
|
|
while (xTicksRemaining <= xTicksToWait) { //xTicksToWait will underflow once xTaskGetTickCount() > ticks_end
|
|
//Block until more free space becomes available or timeout
|
|
if (xSemaphoreTake(pxRingbuffer->xItemsBufferedSemaphore, xTicksRemaining) != pdTRUE) {
|
|
xReturn = pdFALSE; //Timed out attempting to get semaphore
|
|
break;
|
|
}
|
|
|
|
//Semaphore obtained, check if item can be retrieved
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
if (prvCheckItemAvail(pxRingbuffer) == pdTRUE) {
|
|
//Item is available for retrieval
|
|
BaseType_t xIsSplit;
|
|
if (pxRingbuffer->uxRingbufferFlags & rbBYTE_BUFFER_FLAG) {
|
|
//Second argument (pxIsSplit) is unused for byte buffers
|
|
*pvItem1 = pxRingbuffer->pvGetItem(pxRingbuffer, NULL, xMaxSize, xItemSize1);
|
|
} else {
|
|
//Third argument (xMaxSize) is unused for no-split/allow-split buffers
|
|
*pvItem1 = pxRingbuffer->pvGetItem(pxRingbuffer, &xIsSplit, 0, xItemSize1);
|
|
}
|
|
//Check for item split if configured to do so
|
|
if ((pxRingbuffer->uxRingbufferFlags & rbALLOW_SPLIT_FLAG) && (pvItem2 != NULL) && (xItemSize2 != NULL)) {
|
|
if (xIsSplit == pdTRUE) {
|
|
*pvItem2 = pxRingbuffer->pvGetItem(pxRingbuffer, &xIsSplit, 0, xItemSize2);
|
|
configASSERT(*pvItem2 < *pvItem1); //Check wrap around has occurred
|
|
configASSERT(xIsSplit == pdFALSE); //Second part should not have wrapped flag
|
|
} else {
|
|
*pvItem2 = NULL;
|
|
}
|
|
}
|
|
xReturn = pdTRUE;
|
|
if (pxRingbuffer->xItemsWaiting > 0) {
|
|
xReturnSemaphore = pdTRUE;
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
break;
|
|
}
|
|
//No item available for retrieval, adjust ticks and take the semaphore again
|
|
if (xTicksToWait != portMAX_DELAY) {
|
|
xTicksRemaining = xTicksEnd - xTaskGetTickCount();
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
/*
|
|
* Gap between critical section and re-acquiring of the semaphore. If
|
|
* semaphore is given now, priority inversion might occur (see docs)
|
|
*/
|
|
}
|
|
|
|
if (xReturnSemaphore == pdTRUE) {
|
|
xSemaphoreGive(pxRingbuffer->xItemsBufferedSemaphore); //Give semaphore back so other tasks can retrieve
|
|
}
|
|
return xReturn;
|
|
}
|
|
|
|
static BaseType_t prvReceiveGenericFromISR(Ringbuffer_t *pxRingbuffer, void **pvItem1, void **pvItem2, size_t *xItemSize1, size_t *xItemSize2, size_t xMaxSize)
|
|
{
|
|
BaseType_t xReturn = pdFALSE;
|
|
BaseType_t xReturnSemaphore = pdFALSE;
|
|
|
|
portENTER_CRITICAL_ISR(&pxRingbuffer->mux);
|
|
if(prvCheckItemAvail(pxRingbuffer) == pdTRUE) {
|
|
BaseType_t xIsSplit;
|
|
if (pxRingbuffer->uxRingbufferFlags & rbBYTE_BUFFER_FLAG) {
|
|
//Second argument (pxIsSplit) is unused for byte buffers
|
|
*pvItem1 = pxRingbuffer->pvGetItem(pxRingbuffer, NULL, xMaxSize, xItemSize1);
|
|
} else {
|
|
//Third argument (xMaxSize) is unused for no-split/allow-split buffers
|
|
*pvItem1 = pxRingbuffer->pvGetItem(pxRingbuffer, &xIsSplit, 0, xItemSize1);
|
|
}
|
|
//Check for item split if configured to do so
|
|
if ((pxRingbuffer->uxRingbufferFlags & rbALLOW_SPLIT_FLAG) && pvItem2 != NULL && xItemSize2 != NULL) {
|
|
if (xIsSplit == pdTRUE) {
|
|
*pvItem2 = pxRingbuffer->pvGetItem(pxRingbuffer, &xIsSplit, 0, xItemSize2);
|
|
configASSERT(*pvItem2 < *pvItem1); //Check wrap around has occurred
|
|
configASSERT(xIsSplit == pdFALSE); //Second part should not have wrapped flag
|
|
} else {
|
|
*pvItem2 = NULL;
|
|
}
|
|
}
|
|
xReturn = pdTRUE;
|
|
if (pxRingbuffer->xItemsWaiting > 0) {
|
|
xReturnSemaphore = pdTRUE;
|
|
}
|
|
}
|
|
portEXIT_CRITICAL_ISR(&pxRingbuffer->mux);
|
|
|
|
if (xReturnSemaphore == pdTRUE) {
|
|
xSemaphoreGiveFromISR(pxRingbuffer->xItemsBufferedSemaphore, NULL); //Give semaphore back so other tasks can retrieve
|
|
}
|
|
return xReturn;
|
|
}
|
|
|
|
/* ------------------------------------------------- Public Definitions -------------------------------------------- */
|
|
|
|
RingbufHandle_t xRingbufferCreate(size_t xBufferSize, ringbuf_type_t xBufferType)
|
|
{
|
|
//Allocate memory
|
|
Ringbuffer_t *pxRingbuffer = calloc(1, sizeof(Ringbuffer_t));
|
|
if (pxRingbuffer == NULL) {
|
|
goto err;
|
|
}
|
|
if (xBufferType != RINGBUF_TYPE_BYTEBUF) {
|
|
xBufferSize = rbALIGN_SIZE(xBufferSize); //xBufferSize is rounded up for no-split/allow-split buffers
|
|
}
|
|
pxRingbuffer->pucHead = malloc(xBufferSize);
|
|
if (pxRingbuffer->pucHead == NULL) {
|
|
goto err;
|
|
}
|
|
|
|
//Initialize values
|
|
pxRingbuffer->xSize = xBufferSize;
|
|
pxRingbuffer->pucTail = pxRingbuffer->pucHead + xBufferSize;
|
|
pxRingbuffer->pucFree = pxRingbuffer->pucHead;
|
|
pxRingbuffer->pucRead = pxRingbuffer->pucHead;
|
|
pxRingbuffer->pucWrite = pxRingbuffer->pucHead;
|
|
pxRingbuffer->xItemsWaiting = 0;
|
|
pxRingbuffer->xFreeSpaceSemaphore = xSemaphoreCreateBinary();
|
|
pxRingbuffer->xItemsBufferedSemaphore = xSemaphoreCreateBinary();
|
|
pxRingbuffer->uxRingbufferFlags = 0;
|
|
|
|
//Initialize type dependent values and function pointers
|
|
if (xBufferType == RINGBUF_TYPE_NOSPLIT) {
|
|
pxRingbuffer->xCheckItemFits = prvCheckItemFitsDefault;
|
|
pxRingbuffer->vCopyItem = prvCopyItemNoSplit;
|
|
pxRingbuffer->pvGetItem = prvGetItemDefault;
|
|
pxRingbuffer->vReturnItem = prvReturnItemDefault;
|
|
/*
|
|
* Buffer lengths are always aligned. No-split buffer (read/write/free)
|
|
* pointers are also always aligned. Therefore worse case scenario is
|
|
* the write pointer is at the most aligned halfway point.
|
|
*/
|
|
pxRingbuffer->xMaxItemSize = rbALIGN_SIZE(pxRingbuffer->xSize / 2) - rbHEADER_SIZE;
|
|
pxRingbuffer->xGetCurMaxSize = prvGetCurMaxSizeNoSplit;
|
|
} else if (xBufferType == RINGBUF_TYPE_ALLOWSPLIT) {
|
|
pxRingbuffer->uxRingbufferFlags |= rbALLOW_SPLIT_FLAG;
|
|
pxRingbuffer->xCheckItemFits = prvCheckItemFitsDefault;
|
|
pxRingbuffer->vCopyItem = prvCopyItemAllowSplit;
|
|
pxRingbuffer->pvGetItem = prvGetItemDefault;
|
|
pxRingbuffer->vReturnItem = prvReturnItemDefault;
|
|
//Worst case an item is split into two, incurring two headers of overhead
|
|
pxRingbuffer->xMaxItemSize = pxRingbuffer->xSize - (sizeof(ItemHeader_t) * 2);
|
|
pxRingbuffer->xGetCurMaxSize = prvGetCurMaxSizeAllowSplit;
|
|
} else if (xBufferType == RINGBUF_TYPE_BYTEBUF) {
|
|
pxRingbuffer->uxRingbufferFlags |= rbBYTE_BUFFER_FLAG;
|
|
pxRingbuffer->xCheckItemFits = prvCheckItemFitsByteBuffer;
|
|
pxRingbuffer->vCopyItem = prvCopyItemByteBuf;
|
|
pxRingbuffer->pvGetItem = prvGetItemByteBuf;
|
|
pxRingbuffer->vReturnItem = prvReturnItemByteBuf;
|
|
//Byte buffers do not incur any overhead
|
|
pxRingbuffer->xMaxItemSize = pxRingbuffer->xSize;
|
|
pxRingbuffer->xGetCurMaxSize = prvGetCurMaxSizeByteBuf;
|
|
} else {
|
|
//Unsupported type
|
|
configASSERT(0);
|
|
}
|
|
|
|
if (pxRingbuffer->xFreeSpaceSemaphore == NULL || pxRingbuffer->xItemsBufferedSemaphore == NULL) {
|
|
goto err;
|
|
}
|
|
xSemaphoreGive(pxRingbuffer->xFreeSpaceSemaphore);
|
|
vPortCPUInitializeMutex(&pxRingbuffer->mux);
|
|
|
|
return (RingbufHandle_t)pxRingbuffer;
|
|
|
|
err:
|
|
//Some error has happened. Free/destroy all allocated things and return NULL.
|
|
if (pxRingbuffer) {
|
|
free(pxRingbuffer->pucHead);
|
|
if (pxRingbuffer->xFreeSpaceSemaphore) {
|
|
vSemaphoreDelete(pxRingbuffer->xFreeSpaceSemaphore);
|
|
}
|
|
if (pxRingbuffer->xItemsBufferedSemaphore) {
|
|
vSemaphoreDelete(pxRingbuffer->xItemsBufferedSemaphore);
|
|
}
|
|
}
|
|
free(pxRingbuffer);
|
|
return NULL;
|
|
}
|
|
|
|
RingbufHandle_t xRingbufferCreateNoSplit(size_t xItemSize, size_t xItemNum)
|
|
{
|
|
return xRingbufferCreate((rbALIGN_SIZE(xItemSize) + rbHEADER_SIZE) * xItemNum, RINGBUF_TYPE_NOSPLIT);
|
|
}
|
|
|
|
BaseType_t xRingbufferSend(RingbufHandle_t xRingbuffer, const void *pvItem, size_t xItemSize, TickType_t xTicksToWait)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pvItem != NULL || xItemSize == 0);
|
|
if (xItemSize > pxRingbuffer->xMaxItemSize) {
|
|
return pdFALSE; //Data will never ever fit in the queue.
|
|
}
|
|
if ((pxRingbuffer->uxRingbufferFlags & rbBYTE_BUFFER_FLAG) && xItemSize == 0) {
|
|
return pdTRUE; //Sending 0 bytes to byte buffer has no effect
|
|
}
|
|
|
|
//Attempt to send an item
|
|
BaseType_t xReturn = pdFALSE;
|
|
BaseType_t xReturnSemaphore = pdFALSE;
|
|
TickType_t xTicksEnd = xTaskGetTickCount() + xTicksToWait;
|
|
TickType_t xTicksRemaining = xTicksToWait;
|
|
while (xTicksRemaining <= xTicksToWait) { //xTicksToWait will underflow once xTaskGetTickCount() > ticks_end
|
|
//Block until more free space becomes available or timeout
|
|
if (xSemaphoreTake(pxRingbuffer->xFreeSpaceSemaphore, xTicksRemaining) != pdTRUE) {
|
|
xReturn = pdFALSE;
|
|
break;
|
|
}
|
|
//Semaphore obtained, check if item can fit
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
if(pxRingbuffer->xCheckItemFits(pxRingbuffer, xItemSize) == pdTRUE) {
|
|
//Item will fit, copy item
|
|
pxRingbuffer->vCopyItem(pxRingbuffer, pvItem, xItemSize);
|
|
xReturn = pdTRUE;
|
|
//Check if the free semaphore should be returned to allow other tasks to send
|
|
if (prvGetFreeSize(pxRingbuffer) > 0) {
|
|
xReturnSemaphore = pdTRUE;
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
break;
|
|
}
|
|
//Item doesn't fit, adjust ticks and take the semaphore again
|
|
if (xTicksToWait != portMAX_DELAY) {
|
|
xTicksRemaining = xTicksEnd - xTaskGetTickCount();
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
/*
|
|
* Gap between critical section and re-acquiring of the semaphore. If
|
|
* semaphore is given now, priority inversion might occur (see docs)
|
|
*/
|
|
}
|
|
|
|
if (xReturn == pdTRUE) {
|
|
//Indicate item was successfully sent
|
|
xSemaphoreGive(pxRingbuffer->xItemsBufferedSemaphore);
|
|
}
|
|
if (xReturnSemaphore == pdTRUE) {
|
|
xSemaphoreGive(pxRingbuffer->xFreeSpaceSemaphore); //Give back semaphore so other tasks can send
|
|
}
|
|
return xReturn;
|
|
}
|
|
|
|
BaseType_t xRingbufferSendFromISR(RingbufHandle_t xRingbuffer, const void *pvItem, size_t xItemSize, BaseType_t *pxHigherPriorityTaskWoken)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pvItem != NULL || xItemSize == 0);
|
|
if (xItemSize > pxRingbuffer->xMaxItemSize) {
|
|
return pdFALSE; //Data will never ever fit in the queue.
|
|
}
|
|
if ((pxRingbuffer->uxRingbufferFlags & rbBYTE_BUFFER_FLAG) && xItemSize == 0) {
|
|
return pdTRUE; //Sending 0 bytes to byte buffer has no effect
|
|
}
|
|
|
|
//Attempt to send an item
|
|
BaseType_t xReturn;
|
|
BaseType_t xReturnSemaphore = pdFALSE;
|
|
portENTER_CRITICAL_ISR(&pxRingbuffer->mux);
|
|
if (pxRingbuffer->xCheckItemFits(xRingbuffer, xItemSize) == pdTRUE) {
|
|
pxRingbuffer->vCopyItem(xRingbuffer, pvItem, xItemSize);
|
|
xReturn = pdTRUE;
|
|
//Check if the free semaphore should be returned to allow other tasks to send
|
|
if (prvGetFreeSize(pxRingbuffer) > 0) {
|
|
xReturnSemaphore = pdTRUE;
|
|
}
|
|
} else {
|
|
xReturn = pdFALSE;
|
|
}
|
|
portEXIT_CRITICAL_ISR(&pxRingbuffer->mux);
|
|
|
|
if (xReturn == pdTRUE) {
|
|
//Indicate item was successfully sent
|
|
xSemaphoreGiveFromISR(pxRingbuffer->xItemsBufferedSemaphore, pxHigherPriorityTaskWoken);
|
|
}
|
|
if (xReturnSemaphore == pdTRUE) {
|
|
xSemaphoreGiveFromISR(pxRingbuffer->xFreeSpaceSemaphore, pxHigherPriorityTaskWoken); //Give back semaphore so other tasks can send
|
|
}
|
|
return xReturn;
|
|
}
|
|
|
|
void *xRingbufferReceive(RingbufHandle_t xRingbuffer, size_t *pxItemSize, TickType_t xTicksToWait)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
//Attempt to retrieve an item
|
|
void *pvTempItem;
|
|
size_t xTempSize;
|
|
if (prvReceiveGeneric(pxRingbuffer, &pvTempItem, NULL, &xTempSize, NULL, 0, xTicksToWait) == pdTRUE) {
|
|
if (pxItemSize != NULL) {
|
|
*pxItemSize = xTempSize;
|
|
}
|
|
return pvTempItem;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void *xRingbufferReceiveFromISR(RingbufHandle_t xRingbuffer, size_t *pxItemSize)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
//Attempt to retrieve an item
|
|
void *pvTempItem;
|
|
size_t xTempSize;
|
|
if (prvReceiveGenericFromISR(pxRingbuffer, &pvTempItem, NULL, &xTempSize, NULL, 0) == pdTRUE) {
|
|
if (pxItemSize != NULL) {
|
|
*pxItemSize = xTempSize;
|
|
}
|
|
return pvTempItem;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
BaseType_t xRingbufferReceiveSplit(RingbufHandle_t xRingbuffer, void **ppvHeadItem, void **ppvTailItem, size_t *pxHeadItemSize, size_t *pxTailItemSize, TickType_t xTicksToWait)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pxRingbuffer->uxRingbufferFlags & rbALLOW_SPLIT_FLAG);
|
|
configASSERT(ppvHeadItem != NULL && ppvTailItem != NULL);
|
|
|
|
//Attempt to retrieve multiple items
|
|
void *pvTempHeadItem, *pvTempTailItem;
|
|
size_t xTempHeadSize, xTempTailSize;
|
|
if (prvReceiveGeneric(pxRingbuffer, &pvTempHeadItem, &pvTempTailItem, &xTempHeadSize, &xTempTailSize, 0, xTicksToWait) == pdTRUE) {
|
|
//At least one item was retrieved
|
|
*ppvHeadItem = pvTempHeadItem;
|
|
if(pxHeadItemSize != NULL){
|
|
*pxHeadItemSize = xTempHeadSize;
|
|
}
|
|
//Check to see if a second item was also retrieved
|
|
if (pvTempTailItem != NULL) {
|
|
*ppvTailItem = pvTempTailItem;
|
|
if (pxTailItemSize != NULL) {
|
|
*pxTailItemSize = xTempTailSize;
|
|
}
|
|
} else {
|
|
*ppvTailItem = NULL;
|
|
}
|
|
return pdTRUE;
|
|
} else {
|
|
//No items retrieved
|
|
*ppvHeadItem = NULL;
|
|
*ppvTailItem = NULL;
|
|
return pdFALSE;
|
|
}
|
|
}
|
|
|
|
BaseType_t xRingbufferReceiveSplitFromISR(RingbufHandle_t xRingbuffer, void **ppvHeadItem, void **ppvTailItem, size_t *pxHeadItemSize, size_t *pxTailItemSize)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pxRingbuffer->uxRingbufferFlags & rbALLOW_SPLIT_FLAG);
|
|
configASSERT(ppvHeadItem != NULL && ppvTailItem != NULL);
|
|
|
|
//Attempt to retrieve multiple items
|
|
void *pvTempHeadItem = NULL, *pvTempTailItem = NULL;
|
|
size_t xTempHeadSize, xTempTailSize;
|
|
if (prvReceiveGenericFromISR(pxRingbuffer, &pvTempHeadItem, &pvTempTailItem, &xTempHeadSize, &xTempTailSize, 0) == pdTRUE) {
|
|
//At least one item was received
|
|
*ppvHeadItem = pvTempHeadItem;
|
|
if (pxHeadItemSize != NULL) {
|
|
*pxHeadItemSize = xTempHeadSize;
|
|
}
|
|
//Check to see if a second item was also retrieved
|
|
if (pvTempTailItem != NULL) {
|
|
*ppvTailItem = pvTempTailItem;
|
|
if (pxTailItemSize != NULL) {
|
|
*pxTailItemSize = xTempTailSize;
|
|
}
|
|
} else {
|
|
*ppvTailItem = NULL;
|
|
}
|
|
return pdTRUE;
|
|
} else {
|
|
*ppvHeadItem = NULL;
|
|
*ppvTailItem = NULL;
|
|
return pdFALSE;
|
|
}
|
|
}
|
|
|
|
void *xRingbufferReceiveUpTo(RingbufHandle_t xRingbuffer, size_t *pxItemSize, TickType_t xTicksToWait, size_t xMaxSize)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pxRingbuffer->uxRingbufferFlags & rbBYTE_BUFFER_FLAG); //This function should only be called for byte buffers
|
|
if (xMaxSize == 0) {
|
|
return NULL;
|
|
}
|
|
|
|
//Attempt to retrieve up to xMaxSize bytes
|
|
void *pvTempItem;
|
|
size_t xTempSize;
|
|
if (prvReceiveGeneric(pxRingbuffer, &pvTempItem, NULL, &xTempSize, NULL, xMaxSize, xTicksToWait) == pdTRUE) {
|
|
if (pxItemSize != NULL) {
|
|
*pxItemSize = xTempSize;
|
|
}
|
|
return pvTempItem;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void *xRingbufferReceiveUpToFromISR(RingbufHandle_t xRingbuffer, size_t *pxItemSize, size_t xMaxSize)
|
|
{
|
|
//Check arguments
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pxRingbuffer->uxRingbufferFlags & rbBYTE_BUFFER_FLAG); //This function should only be called for byte buffers
|
|
if (xMaxSize == 0) {
|
|
return NULL;
|
|
}
|
|
|
|
//Attempt to retrieve up to xMaxSize bytes
|
|
void *pvTempItem;
|
|
size_t xTempSize;
|
|
if (prvReceiveGenericFromISR(pxRingbuffer, &pvTempItem, NULL, &xTempSize, NULL, xMaxSize) == pdTRUE) {
|
|
if (pxItemSize != NULL) {
|
|
*pxItemSize = xTempSize;
|
|
}
|
|
return pvTempItem;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void vRingbufferReturnItem(RingbufHandle_t xRingbuffer, void *pvItem)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pvItem != NULL);
|
|
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
pxRingbuffer->vReturnItem(pxRingbuffer, (uint8_t *)pvItem);
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
xSemaphoreGive(pxRingbuffer->xFreeSpaceSemaphore);
|
|
}
|
|
|
|
void vRingbufferReturnItemFromISR(RingbufHandle_t xRingbuffer, void *pvItem, BaseType_t *pxHigherPriorityTaskWoken)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
configASSERT(pvItem != NULL);
|
|
|
|
portENTER_CRITICAL_ISR(&pxRingbuffer->mux);
|
|
pxRingbuffer->vReturnItem(pxRingbuffer, (uint8_t *)pvItem);
|
|
portEXIT_CRITICAL_ISR(&pxRingbuffer->mux);
|
|
xSemaphoreGiveFromISR(pxRingbuffer->xFreeSpaceSemaphore, pxHigherPriorityTaskWoken);
|
|
}
|
|
|
|
void vRingbufferDelete(RingbufHandle_t xRingbuffer)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
if (pxRingbuffer) {
|
|
free(pxRingbuffer->pucHead);
|
|
if (pxRingbuffer->xFreeSpaceSemaphore) {
|
|
vSemaphoreDelete(pxRingbuffer->xFreeSpaceSemaphore);
|
|
}
|
|
if (pxRingbuffer->xItemsBufferedSemaphore) {
|
|
vSemaphoreDelete(pxRingbuffer->xItemsBufferedSemaphore);
|
|
}
|
|
}
|
|
free(pxRingbuffer);
|
|
}
|
|
|
|
size_t xRingbufferGetMaxItemSize(RingbufHandle_t xRingbuffer)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
return pxRingbuffer->xMaxItemSize;
|
|
}
|
|
|
|
size_t xRingbufferGetCurFreeSize(RingbufHandle_t xRingbuffer)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
size_t xFreeSize;
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
xFreeSize = pxRingbuffer->xGetCurMaxSize(pxRingbuffer);
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
return xFreeSize;
|
|
}
|
|
|
|
BaseType_t xRingbufferAddToQueueSetRead(RingbufHandle_t xRingbuffer, QueueSetHandle_t xQueueSet)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
BaseType_t xReturn;
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
//Cannot add semaphore to queue set if semaphore is not empty. Temporarily hold semaphore
|
|
BaseType_t xHoldSemaphore = xSemaphoreTake(pxRingbuffer->xItemsBufferedSemaphore, 0);
|
|
xReturn = xQueueAddToSet(pxRingbuffer->xItemsBufferedSemaphore, xQueueSet);
|
|
if (xHoldSemaphore == pdTRUE) {
|
|
//Return semaphore if temporarily held
|
|
configASSERT(xSemaphoreGive(pxRingbuffer->xItemsBufferedSemaphore) == pdTRUE);
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
return xReturn;
|
|
}
|
|
|
|
BaseType_t xRingbufferCanRead(RingbufHandle_t xRingbuffer, QueueSetMemberHandle_t xMember)
|
|
{
|
|
//Check if the selected queue set member is the ring buffer's read semaphore
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
return (pxRingbuffer->xItemsBufferedSemaphore == xMember) ? pdTRUE : pdFALSE;
|
|
}
|
|
|
|
BaseType_t xRingbufferRemoveFromQueueSetRead(RingbufHandle_t xRingbuffer, QueueSetHandle_t xQueueSet)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
BaseType_t xReturn;
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
//Cannot remove semaphore from queue set if semaphore is not empty. Temporarily hold semaphore
|
|
BaseType_t xHoldSemaphore = xSemaphoreTake(pxRingbuffer->xItemsBufferedSemaphore, 0);
|
|
xReturn = xQueueRemoveFromSet(pxRingbuffer->xItemsBufferedSemaphore, xQueueSet);
|
|
if (xHoldSemaphore == pdTRUE) {
|
|
//Return semaphore if temporarily held
|
|
configASSERT(xSemaphoreGive(pxRingbuffer->xItemsBufferedSemaphore) == pdTRUE);
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
return xReturn;
|
|
}
|
|
|
|
void vRingbufferGetInfo(RingbufHandle_t xRingbuffer, UBaseType_t *uxFree, UBaseType_t *uxRead, UBaseType_t *uxWrite, UBaseType_t *uxItemsWaiting)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
if (uxFree != NULL) {
|
|
*uxFree = (UBaseType_t)(pxRingbuffer->pucFree - pxRingbuffer->pucHead);
|
|
}
|
|
if (uxRead != NULL) {
|
|
*uxRead = (UBaseType_t)(pxRingbuffer->pucRead - pxRingbuffer->pucHead);
|
|
}
|
|
if (uxWrite != NULL) {
|
|
*uxWrite = (UBaseType_t)(pxRingbuffer->pucWrite - pxRingbuffer->pucHead);
|
|
}
|
|
if (uxItemsWaiting != NULL) {
|
|
*uxItemsWaiting = (UBaseType_t)(pxRingbuffer->xItemsWaiting);
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
}
|
|
|
|
void xRingbufferPrintInfo(RingbufHandle_t xRingbuffer)
|
|
{
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
printf("Rb size:%d\tfree: %d\trptr: %d\tfreeptr: %d\twptr: %d\n",
|
|
pxRingbuffer->xSize, prvGetFreeSize(pxRingbuffer),
|
|
pxRingbuffer->pucRead - pxRingbuffer->pucHead,
|
|
pxRingbuffer->pucFree - pxRingbuffer->pucHead,
|
|
pxRingbuffer->pucWrite - pxRingbuffer->pucHead);
|
|
}
|
|
|
|
/* --------------------------------- Deprecated Functions ------------------------------ */
|
|
//Todo: Remove the following deprecated functions in next release
|
|
|
|
bool xRingbufferIsNextItemWrapped(RingbufHandle_t xRingbuffer)
|
|
{
|
|
//This function is deprecated, use xRingbufferReceiveSplit() instead
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
bool is_wrapped;
|
|
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
ItemHeader_t *xHeader = (ItemHeader_t *)pxRingbuffer->pucRead;
|
|
is_wrapped = xHeader->uxItemFlags & rbITEM_SPLIT_FLAG;
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
return is_wrapped;
|
|
}
|
|
|
|
BaseType_t xRingbufferAddToQueueSetWrite(RingbufHandle_t xRingbuffer, QueueSetHandle_t xQueueSet)
|
|
{
|
|
//This function is deprecated. QueueSetWrite no longer supported
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
BaseType_t xReturn;
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
//Cannot add semaphore to queue set if semaphore is not empty. Temporary hold semaphore
|
|
BaseType_t xHoldSemaphore = xSemaphoreTake(pxRingbuffer->xFreeSpaceSemaphore, 0);
|
|
xReturn = xQueueAddToSet(pxRingbuffer->xFreeSpaceSemaphore, xQueueSet);
|
|
if (xHoldSemaphore == pdTRUE) {
|
|
//Return semaphore is temporarily held
|
|
configASSERT(xSemaphoreGive(pxRingbuffer->xFreeSpaceSemaphore) == pdTRUE);
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
return xReturn;
|
|
}
|
|
|
|
BaseType_t xRingbufferRemoveFromQueueSetWrite(RingbufHandle_t xRingbuffer, QueueSetHandle_t xQueueSet)
|
|
{
|
|
//This function is deprecated. QueueSetWrite no longer supported
|
|
Ringbuffer_t *pxRingbuffer = (Ringbuffer_t *)xRingbuffer;
|
|
configASSERT(pxRingbuffer);
|
|
|
|
BaseType_t xReturn;
|
|
portENTER_CRITICAL(&pxRingbuffer->mux);
|
|
//Cannot remove semaphore from queue set if semaphore is not empty. Temporary hold semaphore
|
|
BaseType_t xHoldSemaphore = xSemaphoreTake(pxRingbuffer->xFreeSpaceSemaphore, 0);
|
|
xReturn = xQueueRemoveFromSet(pxRingbuffer->xFreeSpaceSemaphore, xQueueSet);
|
|
if (xHoldSemaphore == pdTRUE) {
|
|
//Return semaphore is temporarily held
|
|
configASSERT(xSemaphoreGive(pxRingbuffer->xFreeSpaceSemaphore) == pdTRUE);
|
|
}
|
|
portEXIT_CRITICAL(&pxRingbuffer->mux);
|
|
return xReturn;
|
|
}
|
|
|