mirror of
https://github.com/cesanta/mongoose.git
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1315 lines
53 KiB
C
1315 lines
53 KiB
C
/*
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* FreeRTOS Kernel V10.4.3
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* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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*
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*/
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/* Standard includes. */
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#include <stdint.h>
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#include <string.h>
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/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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* all the API functions to use the MPU wrappers. That should only be done when
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* task.h is included from an application file. */
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#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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/* FreeRTOS includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "stream_buffer.h"
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#if ( configUSE_TASK_NOTIFICATIONS != 1 )
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#error configUSE_TASK_NOTIFICATIONS must be set to 1 to build stream_buffer.c
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#endif
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/* Lint e961, e9021 and e750 are suppressed as a MISRA exception justified
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* because the MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined
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* for the header files above, but not in this file, in order to generate the
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* correct privileged Vs unprivileged linkage and placement. */
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#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750 !e9021. */
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/* If the user has not provided application specific Rx notification macros,
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* or #defined the notification macros away, them provide default implementations
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* that uses task notifications. */
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/*lint -save -e9026 Function like macros allowed and needed here so they can be overridden. */
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#ifndef sbRECEIVE_COMPLETED
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#define sbRECEIVE_COMPLETED( pxStreamBuffer ) \
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vTaskSuspendAll(); \
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{ \
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if( ( pxStreamBuffer )->xTaskWaitingToSend != NULL ) \
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{ \
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( void ) xTaskNotify( ( pxStreamBuffer )->xTaskWaitingToSend, \
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( uint32_t ) 0, \
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eNoAction ); \
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( pxStreamBuffer )->xTaskWaitingToSend = NULL; \
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} \
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} \
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( void ) xTaskResumeAll();
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#endif /* sbRECEIVE_COMPLETED */
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#ifndef sbRECEIVE_COMPLETED_FROM_ISR
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#define sbRECEIVE_COMPLETED_FROM_ISR( pxStreamBuffer, \
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pxHigherPriorityTaskWoken ) \
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{ \
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UBaseType_t uxSavedInterruptStatus; \
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\
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uxSavedInterruptStatus = ( UBaseType_t ) portSET_INTERRUPT_MASK_FROM_ISR(); \
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{ \
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if( ( pxStreamBuffer )->xTaskWaitingToSend != NULL ) \
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{ \
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( void ) xTaskNotifyFromISR( ( pxStreamBuffer )->xTaskWaitingToSend, \
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( uint32_t ) 0, \
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eNoAction, \
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pxHigherPriorityTaskWoken ); \
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( pxStreamBuffer )->xTaskWaitingToSend = NULL; \
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} \
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} \
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portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus ); \
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}
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#endif /* sbRECEIVE_COMPLETED_FROM_ISR */
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/* If the user has not provided an application specific Tx notification macro,
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* or #defined the notification macro away, them provide a default implementation
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* that uses task notifications. */
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#ifndef sbSEND_COMPLETED
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#define sbSEND_COMPLETED( pxStreamBuffer ) \
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vTaskSuspendAll(); \
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{ \
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if( ( pxStreamBuffer )->xTaskWaitingToReceive != NULL ) \
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{ \
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( void ) xTaskNotify( ( pxStreamBuffer )->xTaskWaitingToReceive, \
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( uint32_t ) 0, \
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eNoAction ); \
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( pxStreamBuffer )->xTaskWaitingToReceive = NULL; \
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} \
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} \
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( void ) xTaskResumeAll();
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#endif /* sbSEND_COMPLETED */
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#ifndef sbSEND_COMPLETE_FROM_ISR
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#define sbSEND_COMPLETE_FROM_ISR( pxStreamBuffer, pxHigherPriorityTaskWoken ) \
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{ \
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UBaseType_t uxSavedInterruptStatus; \
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\
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uxSavedInterruptStatus = ( UBaseType_t ) portSET_INTERRUPT_MASK_FROM_ISR(); \
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{ \
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if( ( pxStreamBuffer )->xTaskWaitingToReceive != NULL ) \
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{ \
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( void ) xTaskNotifyFromISR( ( pxStreamBuffer )->xTaskWaitingToReceive, \
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( uint32_t ) 0, \
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eNoAction, \
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pxHigherPriorityTaskWoken ); \
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( pxStreamBuffer )->xTaskWaitingToReceive = NULL; \
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} \
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} \
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portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus ); \
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}
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#endif /* sbSEND_COMPLETE_FROM_ISR */
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/*lint -restore (9026) */
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/* The number of bytes used to hold the length of a message in the buffer. */
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#define sbBYTES_TO_STORE_MESSAGE_LENGTH ( sizeof( configMESSAGE_BUFFER_LENGTH_TYPE ) )
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/* Bits stored in the ucFlags field of the stream buffer. */
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#define sbFLAGS_IS_MESSAGE_BUFFER ( ( uint8_t ) 1 ) /* Set if the stream buffer was created as a message buffer, in which case it holds discrete messages rather than a stream. */
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#define sbFLAGS_IS_STATICALLY_ALLOCATED ( ( uint8_t ) 2 ) /* Set if the stream buffer was created using statically allocated memory. */
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/*-----------------------------------------------------------*/
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/* Structure that hold state information on the buffer. */
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typedef struct StreamBufferDef_t /*lint !e9058 Style convention uses tag. */
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{
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volatile size_t xTail; /* Index to the next item to read within the buffer. */
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volatile size_t xHead; /* Index to the next item to write within the buffer. */
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size_t xLength; /* The length of the buffer pointed to by pucBuffer. */
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size_t xTriggerLevelBytes; /* The number of bytes that must be in the stream buffer before a task that is waiting for data is unblocked. */
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volatile TaskHandle_t xTaskWaitingToReceive; /* Holds the handle of a task waiting for data, or NULL if no tasks are waiting. */
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volatile TaskHandle_t xTaskWaitingToSend; /* Holds the handle of a task waiting to send data to a message buffer that is full. */
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uint8_t * pucBuffer; /* Points to the buffer itself - that is - the RAM that stores the data passed through the buffer. */
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uint8_t ucFlags;
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#if ( configUSE_TRACE_FACILITY == 1 )
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UBaseType_t uxStreamBufferNumber; /* Used for tracing purposes. */
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#endif
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} StreamBuffer_t;
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/*
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* The number of bytes available to be read from the buffer.
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*/
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static size_t prvBytesInBuffer( const StreamBuffer_t * const pxStreamBuffer ) PRIVILEGED_FUNCTION;
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/*
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* Add xCount bytes from pucData into the pxStreamBuffer message buffer.
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* Returns the number of bytes written, which will either equal xCount in the
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* success case, or 0 if there was not enough space in the buffer (in which case
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* no data is written into the buffer).
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*/
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static size_t prvWriteBytesToBuffer( StreamBuffer_t * const pxStreamBuffer,
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const uint8_t * pucData,
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size_t xCount ) PRIVILEGED_FUNCTION;
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/*
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* If the stream buffer is being used as a message buffer, then reads an entire
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* message out of the buffer. If the stream buffer is being used as a stream
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* buffer then read as many bytes as possible from the buffer.
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* prvReadBytesFromBuffer() is called to actually extract the bytes from the
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* buffer's data storage area.
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*/
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static size_t prvReadMessageFromBuffer( StreamBuffer_t * pxStreamBuffer,
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void * pvRxData,
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size_t xBufferLengthBytes,
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size_t xBytesAvailable,
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size_t xBytesToStoreMessageLength ) PRIVILEGED_FUNCTION;
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/*
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* If the stream buffer is being used as a message buffer, then writes an entire
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* message to the buffer. If the stream buffer is being used as a stream
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* buffer then write as many bytes as possible to the buffer.
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* prvWriteBytestoBuffer() is called to actually send the bytes to the buffer's
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* data storage area.
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*/
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static size_t prvWriteMessageToBuffer( StreamBuffer_t * const pxStreamBuffer,
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const void * pvTxData,
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size_t xDataLengthBytes,
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size_t xSpace,
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size_t xRequiredSpace ) PRIVILEGED_FUNCTION;
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/*
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* Read xMaxCount bytes from the pxStreamBuffer message buffer and write them
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* to pucData.
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*/
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static size_t prvReadBytesFromBuffer( StreamBuffer_t * pxStreamBuffer,
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uint8_t * pucData,
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size_t xMaxCount,
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size_t xBytesAvailable ) PRIVILEGED_FUNCTION;
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/*
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* Called by both pxStreamBufferCreate() and pxStreamBufferCreateStatic() to
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* initialise the members of the newly created stream buffer structure.
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*/
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static void prvInitialiseNewStreamBuffer( StreamBuffer_t * const pxStreamBuffer,
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uint8_t * const pucBuffer,
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size_t xBufferSizeBytes,
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size_t xTriggerLevelBytes,
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uint8_t ucFlags ) PRIVILEGED_FUNCTION;
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/*-----------------------------------------------------------*/
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#if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
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StreamBufferHandle_t xStreamBufferGenericCreate( size_t xBufferSizeBytes,
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size_t xTriggerLevelBytes,
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BaseType_t xIsMessageBuffer )
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{
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uint8_t * pucAllocatedMemory;
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uint8_t ucFlags;
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/* In case the stream buffer is going to be used as a message buffer
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* (that is, it will hold discrete messages with a little meta data that
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* says how big the next message is) check the buffer will be large enough
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* to hold at least one message. */
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if( xIsMessageBuffer == pdTRUE )
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{
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/* Is a message buffer but not statically allocated. */
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ucFlags = sbFLAGS_IS_MESSAGE_BUFFER;
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configASSERT( xBufferSizeBytes > sbBYTES_TO_STORE_MESSAGE_LENGTH );
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}
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else
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{
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/* Not a message buffer and not statically allocated. */
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ucFlags = 0;
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configASSERT( xBufferSizeBytes > 0 );
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}
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configASSERT( xTriggerLevelBytes <= xBufferSizeBytes );
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/* A trigger level of 0 would cause a waiting task to unblock even when
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* the buffer was empty. */
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if( xTriggerLevelBytes == ( size_t ) 0 )
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{
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xTriggerLevelBytes = ( size_t ) 1;
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}
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/* A stream buffer requires a StreamBuffer_t structure and a buffer.
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* Both are allocated in a single call to pvPortMalloc(). The
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* StreamBuffer_t structure is placed at the start of the allocated memory
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* and the buffer follows immediately after. The requested size is
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* incremented so the free space is returned as the user would expect -
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* this is a quirk of the implementation that means otherwise the free
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* space would be reported as one byte smaller than would be logically
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* expected. */
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if( xBufferSizeBytes < ( xBufferSizeBytes + 1 + sizeof( StreamBuffer_t ) ) )
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{
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xBufferSizeBytes++;
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pucAllocatedMemory = ( uint8_t * ) pvPortMalloc( xBufferSizeBytes + sizeof( StreamBuffer_t ) ); /*lint !e9079 malloc() only returns void*. */
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}
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else
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{
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pucAllocatedMemory = NULL;
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}
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if( pucAllocatedMemory != NULL )
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{
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prvInitialiseNewStreamBuffer( ( StreamBuffer_t * ) pucAllocatedMemory, /* Structure at the start of the allocated memory. */ /*lint !e9087 Safe cast as allocated memory is aligned. */ /*lint !e826 Area is not too small and alignment is guaranteed provided malloc() behaves as expected and returns aligned buffer. */
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pucAllocatedMemory + sizeof( StreamBuffer_t ), /* Storage area follows. */ /*lint !e9016 Indexing past structure valid for uint8_t pointer, also storage area has no alignment requirement. */
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xBufferSizeBytes,
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xTriggerLevelBytes,
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ucFlags );
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traceSTREAM_BUFFER_CREATE( ( ( StreamBuffer_t * ) pucAllocatedMemory ), xIsMessageBuffer );
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}
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else
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{
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traceSTREAM_BUFFER_CREATE_FAILED( xIsMessageBuffer );
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}
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return ( StreamBufferHandle_t ) pucAllocatedMemory; /*lint !e9087 !e826 Safe cast as allocated memory is aligned. */
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}
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#endif /* configSUPPORT_DYNAMIC_ALLOCATION */
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/*-----------------------------------------------------------*/
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#if ( configSUPPORT_STATIC_ALLOCATION == 1 )
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StreamBufferHandle_t xStreamBufferGenericCreateStatic( size_t xBufferSizeBytes,
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size_t xTriggerLevelBytes,
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BaseType_t xIsMessageBuffer,
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uint8_t * const pucStreamBufferStorageArea,
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StaticStreamBuffer_t * const pxStaticStreamBuffer )
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{
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StreamBuffer_t * const pxStreamBuffer = ( StreamBuffer_t * ) pxStaticStreamBuffer; /*lint !e740 !e9087 Safe cast as StaticStreamBuffer_t is opaque Streambuffer_t. */
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StreamBufferHandle_t xReturn;
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uint8_t ucFlags;
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configASSERT( pucStreamBufferStorageArea );
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configASSERT( pxStaticStreamBuffer );
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configASSERT( xTriggerLevelBytes <= xBufferSizeBytes );
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/* A trigger level of 0 would cause a waiting task to unblock even when
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* the buffer was empty. */
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if( xTriggerLevelBytes == ( size_t ) 0 )
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{
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xTriggerLevelBytes = ( size_t ) 1;
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}
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if( xIsMessageBuffer != pdFALSE )
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{
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/* Statically allocated message buffer. */
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ucFlags = sbFLAGS_IS_MESSAGE_BUFFER | sbFLAGS_IS_STATICALLY_ALLOCATED;
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}
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else
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{
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/* Statically allocated stream buffer. */
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ucFlags = sbFLAGS_IS_STATICALLY_ALLOCATED;
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}
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/* In case the stream buffer is going to be used as a message buffer
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* (that is, it will hold discrete messages with a little meta data that
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* says how big the next message is) check the buffer will be large enough
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* to hold at least one message. */
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configASSERT( xBufferSizeBytes > sbBYTES_TO_STORE_MESSAGE_LENGTH );
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#if ( configASSERT_DEFINED == 1 )
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{
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/* Sanity check that the size of the structure used to declare a
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* variable of type StaticStreamBuffer_t equals the size of the real
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* message buffer structure. */
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volatile size_t xSize = sizeof( StaticStreamBuffer_t );
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configASSERT( xSize == sizeof( StreamBuffer_t ) );
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} /*lint !e529 xSize is referenced is configASSERT() is defined. */
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#endif /* configASSERT_DEFINED */
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if( ( pucStreamBufferStorageArea != NULL ) && ( pxStaticStreamBuffer != NULL ) )
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{
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prvInitialiseNewStreamBuffer( pxStreamBuffer,
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pucStreamBufferStorageArea,
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xBufferSizeBytes,
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xTriggerLevelBytes,
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ucFlags );
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/* Remember this was statically allocated in case it is ever deleted
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* again. */
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pxStreamBuffer->ucFlags |= sbFLAGS_IS_STATICALLY_ALLOCATED;
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traceSTREAM_BUFFER_CREATE( pxStreamBuffer, xIsMessageBuffer );
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xReturn = ( StreamBufferHandle_t ) pxStaticStreamBuffer; /*lint !e9087 Data hiding requires cast to opaque type. */
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}
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else
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{
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xReturn = NULL;
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traceSTREAM_BUFFER_CREATE_STATIC_FAILED( xReturn, xIsMessageBuffer );
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}
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return xReturn;
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}
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#endif /* ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
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/*-----------------------------------------------------------*/
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void vStreamBufferDelete( StreamBufferHandle_t xStreamBuffer )
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{
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StreamBuffer_t * pxStreamBuffer = xStreamBuffer;
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configASSERT( pxStreamBuffer );
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traceSTREAM_BUFFER_DELETE( xStreamBuffer );
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if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_STATICALLY_ALLOCATED ) == ( uint8_t ) pdFALSE )
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{
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#if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
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{
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/* Both the structure and the buffer were allocated using a single call
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* to pvPortMalloc(), hence only one call to vPortFree() is required. */
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vPortFree( ( void * ) pxStreamBuffer ); /*lint !e9087 Standard free() semantics require void *, plus pxStreamBuffer was allocated by pvPortMalloc(). */
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}
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#else
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{
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/* Should not be possible to get here, ucFlags must be corrupt.
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* Force an assert. */
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configASSERT( xStreamBuffer == ( StreamBufferHandle_t ) ~0 );
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}
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#endif
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}
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else
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{
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/* The structure and buffer were not allocated dynamically and cannot be
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* freed - just scrub the structure so future use will assert. */
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( void ) memset( pxStreamBuffer, 0x00, sizeof( StreamBuffer_t ) );
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}
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}
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/*-----------------------------------------------------------*/
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BaseType_t xStreamBufferReset( StreamBufferHandle_t xStreamBuffer )
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{
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StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
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BaseType_t xReturn = pdFAIL;
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
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UBaseType_t uxStreamBufferNumber;
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#endif
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|
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configASSERT( pxStreamBuffer );
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|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
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{
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/* Store the stream buffer number so it can be restored after the
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* reset. */
|
|
uxStreamBufferNumber = pxStreamBuffer->uxStreamBufferNumber;
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}
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#endif
|
|
|
|
/* Can only reset a message buffer if there are no tasks blocked on it. */
|
|
taskENTER_CRITICAL();
|
|
{
|
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if( pxStreamBuffer->xTaskWaitingToReceive == NULL )
|
|
{
|
|
if( pxStreamBuffer->xTaskWaitingToSend == NULL )
|
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{
|
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prvInitialiseNewStreamBuffer( pxStreamBuffer,
|
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pxStreamBuffer->pucBuffer,
|
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pxStreamBuffer->xLength,
|
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pxStreamBuffer->xTriggerLevelBytes,
|
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pxStreamBuffer->ucFlags );
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xReturn = pdPASS;
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|
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#if ( configUSE_TRACE_FACILITY == 1 )
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{
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pxStreamBuffer->uxStreamBufferNumber = uxStreamBufferNumber;
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}
|
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#endif
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|
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traceSTREAM_BUFFER_RESET( xStreamBuffer );
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}
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}
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}
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taskEXIT_CRITICAL();
|
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|
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return xReturn;
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}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
BaseType_t xStreamBufferSetTriggerLevel( StreamBufferHandle_t xStreamBuffer,
|
|
size_t xTriggerLevel )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
BaseType_t xReturn;
|
|
|
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configASSERT( pxStreamBuffer );
|
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|
|
/* It is not valid for the trigger level to be 0. */
|
|
if( xTriggerLevel == ( size_t ) 0 )
|
|
{
|
|
xTriggerLevel = ( size_t ) 1;
|
|
}
|
|
|
|
/* The trigger level is the number of bytes that must be in the stream
|
|
* buffer before a task that is waiting for data is unblocked. */
|
|
if( xTriggerLevel <= pxStreamBuffer->xLength )
|
|
{
|
|
pxStreamBuffer->xTriggerLevelBytes = xTriggerLevel;
|
|
xReturn = pdPASS;
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFALSE;
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xStreamBufferSpacesAvailable( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
const StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
size_t xSpace;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
xSpace = pxStreamBuffer->xLength + pxStreamBuffer->xTail;
|
|
xSpace -= pxStreamBuffer->xHead;
|
|
xSpace -= ( size_t ) 1;
|
|
|
|
if( xSpace >= pxStreamBuffer->xLength )
|
|
{
|
|
xSpace -= pxStreamBuffer->xLength;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
return xSpace;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xStreamBufferBytesAvailable( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
const StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
size_t xReturn;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
xReturn = prvBytesInBuffer( pxStreamBuffer );
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xStreamBufferSend( StreamBufferHandle_t xStreamBuffer,
|
|
const void * pvTxData,
|
|
size_t xDataLengthBytes,
|
|
TickType_t xTicksToWait )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
size_t xReturn, xSpace = 0;
|
|
size_t xRequiredSpace = xDataLengthBytes;
|
|
TimeOut_t xTimeOut;
|
|
|
|
/* The maximum amount of space a stream buffer will ever report is its length
|
|
* minus 1. */
|
|
const size_t xMaxReportedSpace = pxStreamBuffer->xLength - ( size_t ) 1;
|
|
|
|
configASSERT( pvTxData );
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* This send function is used to write to both message buffers and stream
|
|
* buffers. If this is a message buffer then the space needed must be
|
|
* increased by the amount of bytes needed to store the length of the
|
|
* message. */
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
xRequiredSpace += sbBYTES_TO_STORE_MESSAGE_LENGTH;
|
|
|
|
/* Overflow? */
|
|
configASSERT( xRequiredSpace > xDataLengthBytes );
|
|
|
|
/* If this is a message buffer then it must be possible to write the
|
|
* whole message. */
|
|
if( xRequiredSpace > xMaxReportedSpace )
|
|
{
|
|
/* The message would not fit even if the entire buffer was empty,
|
|
* so don't wait for space. */
|
|
xTicksToWait = ( TickType_t ) 0;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* If this is a stream buffer then it is acceptable to write only part
|
|
* of the message to the buffer. Cap the length to the total length of
|
|
* the buffer. */
|
|
if( xRequiredSpace > xMaxReportedSpace )
|
|
{
|
|
xRequiredSpace = xMaxReportedSpace;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
|
|
if( xTicksToWait != ( TickType_t ) 0 )
|
|
{
|
|
vTaskSetTimeOutState( &xTimeOut );
|
|
|
|
do
|
|
{
|
|
/* Wait until the required number of bytes are free in the message
|
|
* buffer. */
|
|
taskENTER_CRITICAL();
|
|
{
|
|
xSpace = xStreamBufferSpacesAvailable( pxStreamBuffer );
|
|
|
|
if( xSpace < xRequiredSpace )
|
|
{
|
|
/* Clear notification state as going to wait for space. */
|
|
( void ) xTaskNotifyStateClear( NULL );
|
|
|
|
/* Should only be one writer. */
|
|
configASSERT( pxStreamBuffer->xTaskWaitingToSend == NULL );
|
|
pxStreamBuffer->xTaskWaitingToSend = xTaskGetCurrentTaskHandle();
|
|
}
|
|
else
|
|
{
|
|
taskEXIT_CRITICAL();
|
|
break;
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
traceBLOCKING_ON_STREAM_BUFFER_SEND( xStreamBuffer );
|
|
( void ) xTaskNotifyWait( ( uint32_t ) 0, ( uint32_t ) 0, NULL, xTicksToWait );
|
|
pxStreamBuffer->xTaskWaitingToSend = NULL;
|
|
} while( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE );
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
if( xSpace == ( size_t ) 0 )
|
|
{
|
|
xSpace = xStreamBufferSpacesAvailable( pxStreamBuffer );
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
xReturn = prvWriteMessageToBuffer( pxStreamBuffer, pvTxData, xDataLengthBytes, xSpace, xRequiredSpace );
|
|
|
|
if( xReturn > ( size_t ) 0 )
|
|
{
|
|
traceSTREAM_BUFFER_SEND( xStreamBuffer, xReturn );
|
|
|
|
/* Was a task waiting for the data? */
|
|
if( prvBytesInBuffer( pxStreamBuffer ) >= pxStreamBuffer->xTriggerLevelBytes )
|
|
{
|
|
sbSEND_COMPLETED( pxStreamBuffer );
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
traceSTREAM_BUFFER_SEND_FAILED( xStreamBuffer );
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xStreamBufferSendFromISR( StreamBufferHandle_t xStreamBuffer,
|
|
const void * pvTxData,
|
|
size_t xDataLengthBytes,
|
|
BaseType_t * const pxHigherPriorityTaskWoken )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
size_t xReturn, xSpace;
|
|
size_t xRequiredSpace = xDataLengthBytes;
|
|
|
|
configASSERT( pvTxData );
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* This send function is used to write to both message buffers and stream
|
|
* buffers. If this is a message buffer then the space needed must be
|
|
* increased by the amount of bytes needed to store the length of the
|
|
* message. */
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
xRequiredSpace += sbBYTES_TO_STORE_MESSAGE_LENGTH;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
xSpace = xStreamBufferSpacesAvailable( pxStreamBuffer );
|
|
xReturn = prvWriteMessageToBuffer( pxStreamBuffer, pvTxData, xDataLengthBytes, xSpace, xRequiredSpace );
|
|
|
|
if( xReturn > ( size_t ) 0 )
|
|
{
|
|
/* Was a task waiting for the data? */
|
|
if( prvBytesInBuffer( pxStreamBuffer ) >= pxStreamBuffer->xTriggerLevelBytes )
|
|
{
|
|
sbSEND_COMPLETE_FROM_ISR( pxStreamBuffer, pxHigherPriorityTaskWoken );
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
traceSTREAM_BUFFER_SEND_FROM_ISR( xStreamBuffer, xReturn );
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static size_t prvWriteMessageToBuffer( StreamBuffer_t * const pxStreamBuffer,
|
|
const void * pvTxData,
|
|
size_t xDataLengthBytes,
|
|
size_t xSpace,
|
|
size_t xRequiredSpace )
|
|
{
|
|
BaseType_t xShouldWrite;
|
|
size_t xReturn;
|
|
|
|
if( xSpace == ( size_t ) 0 )
|
|
{
|
|
/* Doesn't matter if this is a stream buffer or a message buffer, there
|
|
* is no space to write. */
|
|
xShouldWrite = pdFALSE;
|
|
}
|
|
else if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) == ( uint8_t ) 0 )
|
|
{
|
|
/* This is a stream buffer, as opposed to a message buffer, so writing a
|
|
* stream of bytes rather than discrete messages. Write as many bytes as
|
|
* possible. */
|
|
xShouldWrite = pdTRUE;
|
|
xDataLengthBytes = configMIN( xDataLengthBytes, xSpace );
|
|
}
|
|
else if( xSpace >= xRequiredSpace )
|
|
{
|
|
/* This is a message buffer, as opposed to a stream buffer, and there
|
|
* is enough space to write both the message length and the message itself
|
|
* into the buffer. Start by writing the length of the data, the data
|
|
* itself will be written later in this function. */
|
|
xShouldWrite = pdTRUE;
|
|
( void ) prvWriteBytesToBuffer( pxStreamBuffer, ( const uint8_t * ) &( xDataLengthBytes ), sbBYTES_TO_STORE_MESSAGE_LENGTH );
|
|
}
|
|
else
|
|
{
|
|
/* There is space available, but not enough space. */
|
|
xShouldWrite = pdFALSE;
|
|
}
|
|
|
|
if( xShouldWrite != pdFALSE )
|
|
{
|
|
/* Writes the data itself. */
|
|
xReturn = prvWriteBytesToBuffer( pxStreamBuffer, ( const uint8_t * ) pvTxData, xDataLengthBytes ); /*lint !e9079 Storage buffer is implemented as uint8_t for ease of sizing, alignment and access. */
|
|
}
|
|
else
|
|
{
|
|
xReturn = 0;
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xStreamBufferReceive( StreamBufferHandle_t xStreamBuffer,
|
|
void * pvRxData,
|
|
size_t xBufferLengthBytes,
|
|
TickType_t xTicksToWait )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
size_t xReceivedLength = 0, xBytesAvailable, xBytesToStoreMessageLength;
|
|
|
|
configASSERT( pvRxData );
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* This receive function is used by both message buffers, which store
|
|
* discrete messages, and stream buffers, which store a continuous stream of
|
|
* bytes. Discrete messages include an additional
|
|
* sbBYTES_TO_STORE_MESSAGE_LENGTH bytes that hold the length of the
|
|
* message. */
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
xBytesToStoreMessageLength = sbBYTES_TO_STORE_MESSAGE_LENGTH;
|
|
}
|
|
else
|
|
{
|
|
xBytesToStoreMessageLength = 0;
|
|
}
|
|
|
|
if( xTicksToWait != ( TickType_t ) 0 )
|
|
{
|
|
/* Checking if there is data and clearing the notification state must be
|
|
* performed atomically. */
|
|
taskENTER_CRITICAL();
|
|
{
|
|
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );
|
|
|
|
/* If this function was invoked by a message buffer read then
|
|
* xBytesToStoreMessageLength holds the number of bytes used to hold
|
|
* the length of the next discrete message. If this function was
|
|
* invoked by a stream buffer read then xBytesToStoreMessageLength will
|
|
* be 0. */
|
|
if( xBytesAvailable <= xBytesToStoreMessageLength )
|
|
{
|
|
/* Clear notification state as going to wait for data. */
|
|
( void ) xTaskNotifyStateClear( NULL );
|
|
|
|
/* Should only be one reader. */
|
|
configASSERT( pxStreamBuffer->xTaskWaitingToReceive == NULL );
|
|
pxStreamBuffer->xTaskWaitingToReceive = xTaskGetCurrentTaskHandle();
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
if( xBytesAvailable <= xBytesToStoreMessageLength )
|
|
{
|
|
/* Wait for data to be available. */
|
|
traceBLOCKING_ON_STREAM_BUFFER_RECEIVE( xStreamBuffer );
|
|
( void ) xTaskNotifyWait( ( uint32_t ) 0, ( uint32_t ) 0, NULL, xTicksToWait );
|
|
pxStreamBuffer->xTaskWaitingToReceive = NULL;
|
|
|
|
/* Recheck the data available after blocking. */
|
|
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );
|
|
}
|
|
|
|
/* Whether receiving a discrete message (where xBytesToStoreMessageLength
|
|
* holds the number of bytes used to store the message length) or a stream of
|
|
* bytes (where xBytesToStoreMessageLength is zero), the number of bytes
|
|
* available must be greater than xBytesToStoreMessageLength to be able to
|
|
* read bytes from the buffer. */
|
|
if( xBytesAvailable > xBytesToStoreMessageLength )
|
|
{
|
|
xReceivedLength = prvReadMessageFromBuffer( pxStreamBuffer, pvRxData, xBufferLengthBytes, xBytesAvailable, xBytesToStoreMessageLength );
|
|
|
|
/* Was a task waiting for space in the buffer? */
|
|
if( xReceivedLength != ( size_t ) 0 )
|
|
{
|
|
traceSTREAM_BUFFER_RECEIVE( xStreamBuffer, xReceivedLength );
|
|
sbRECEIVE_COMPLETED( pxStreamBuffer );
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
traceSTREAM_BUFFER_RECEIVE_FAILED( xStreamBuffer );
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
return xReceivedLength;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xStreamBufferNextMessageLengthBytes( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
size_t xReturn, xBytesAvailable, xOriginalTail;
|
|
configMESSAGE_BUFFER_LENGTH_TYPE xTempReturn;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* Ensure the stream buffer is being used as a message buffer. */
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );
|
|
|
|
if( xBytesAvailable > sbBYTES_TO_STORE_MESSAGE_LENGTH )
|
|
{
|
|
/* The number of bytes available is greater than the number of bytes
|
|
* required to hold the length of the next message, so another message
|
|
* is available. Return its length without removing the length bytes
|
|
* from the buffer. A copy of the tail is stored so the buffer can be
|
|
* returned to its prior state as the message is not actually being
|
|
* removed from the buffer. */
|
|
xOriginalTail = pxStreamBuffer->xTail;
|
|
( void ) prvReadBytesFromBuffer( pxStreamBuffer, ( uint8_t * ) &xTempReturn, sbBYTES_TO_STORE_MESSAGE_LENGTH, xBytesAvailable );
|
|
xReturn = ( size_t ) xTempReturn;
|
|
pxStreamBuffer->xTail = xOriginalTail;
|
|
}
|
|
else
|
|
{
|
|
/* The minimum amount of bytes in a message buffer is
|
|
* ( sbBYTES_TO_STORE_MESSAGE_LENGTH + 1 ), so if xBytesAvailable is
|
|
* less than sbBYTES_TO_STORE_MESSAGE_LENGTH the only other valid
|
|
* value is 0. */
|
|
configASSERT( xBytesAvailable == 0 );
|
|
xReturn = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
xReturn = 0;
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xStreamBufferReceiveFromISR( StreamBufferHandle_t xStreamBuffer,
|
|
void * pvRxData,
|
|
size_t xBufferLengthBytes,
|
|
BaseType_t * const pxHigherPriorityTaskWoken )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
size_t xReceivedLength = 0, xBytesAvailable, xBytesToStoreMessageLength;
|
|
|
|
configASSERT( pvRxData );
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* This receive function is used by both message buffers, which store
|
|
* discrete messages, and stream buffers, which store a continuous stream of
|
|
* bytes. Discrete messages include an additional
|
|
* sbBYTES_TO_STORE_MESSAGE_LENGTH bytes that hold the length of the
|
|
* message. */
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
xBytesToStoreMessageLength = sbBYTES_TO_STORE_MESSAGE_LENGTH;
|
|
}
|
|
else
|
|
{
|
|
xBytesToStoreMessageLength = 0;
|
|
}
|
|
|
|
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );
|
|
|
|
/* Whether receiving a discrete message (where xBytesToStoreMessageLength
|
|
* holds the number of bytes used to store the message length) or a stream of
|
|
* bytes (where xBytesToStoreMessageLength is zero), the number of bytes
|
|
* available must be greater than xBytesToStoreMessageLength to be able to
|
|
* read bytes from the buffer. */
|
|
if( xBytesAvailable > xBytesToStoreMessageLength )
|
|
{
|
|
xReceivedLength = prvReadMessageFromBuffer( pxStreamBuffer, pvRxData, xBufferLengthBytes, xBytesAvailable, xBytesToStoreMessageLength );
|
|
|
|
/* Was a task waiting for space in the buffer? */
|
|
if( xReceivedLength != ( size_t ) 0 )
|
|
{
|
|
sbRECEIVE_COMPLETED_FROM_ISR( pxStreamBuffer, pxHigherPriorityTaskWoken );
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
traceSTREAM_BUFFER_RECEIVE_FROM_ISR( xStreamBuffer, xReceivedLength );
|
|
|
|
return xReceivedLength;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static size_t prvReadMessageFromBuffer( StreamBuffer_t * pxStreamBuffer,
|
|
void * pvRxData,
|
|
size_t xBufferLengthBytes,
|
|
size_t xBytesAvailable,
|
|
size_t xBytesToStoreMessageLength )
|
|
{
|
|
size_t xOriginalTail, xReceivedLength, xNextMessageLength;
|
|
configMESSAGE_BUFFER_LENGTH_TYPE xTempNextMessageLength;
|
|
|
|
if( xBytesToStoreMessageLength != ( size_t ) 0 )
|
|
{
|
|
/* A discrete message is being received. First receive the length
|
|
* of the message. A copy of the tail is stored so the buffer can be
|
|
* returned to its prior state if the length of the message is too
|
|
* large for the provided buffer. */
|
|
xOriginalTail = pxStreamBuffer->xTail;
|
|
( void ) prvReadBytesFromBuffer( pxStreamBuffer, ( uint8_t * ) &xTempNextMessageLength, xBytesToStoreMessageLength, xBytesAvailable );
|
|
xNextMessageLength = ( size_t ) xTempNextMessageLength;
|
|
|
|
/* Reduce the number of bytes available by the number of bytes just
|
|
* read out. */
|
|
xBytesAvailable -= xBytesToStoreMessageLength;
|
|
|
|
/* Check there is enough space in the buffer provided by the
|
|
* user. */
|
|
if( xNextMessageLength > xBufferLengthBytes )
|
|
{
|
|
/* The user has provided insufficient space to read the message
|
|
* so return the buffer to its previous state (so the length of
|
|
* the message is in the buffer again). */
|
|
pxStreamBuffer->xTail = xOriginalTail;
|
|
xNextMessageLength = 0;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* A stream of bytes is being received (as opposed to a discrete
|
|
* message), so read as many bytes as possible. */
|
|
xNextMessageLength = xBufferLengthBytes;
|
|
}
|
|
|
|
/* Read the actual data. */
|
|
xReceivedLength = prvReadBytesFromBuffer( pxStreamBuffer, ( uint8_t * ) pvRxData, xNextMessageLength, xBytesAvailable ); /*lint !e9079 Data storage area is implemented as uint8_t array for ease of sizing, indexing and alignment. */
|
|
|
|
return xReceivedLength;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
BaseType_t xStreamBufferIsEmpty( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
const StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
BaseType_t xReturn;
|
|
size_t xTail;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* True if no bytes are available. */
|
|
xTail = pxStreamBuffer->xTail;
|
|
|
|
if( pxStreamBuffer->xHead == xTail )
|
|
{
|
|
xReturn = pdTRUE;
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFALSE;
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
BaseType_t xStreamBufferIsFull( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
BaseType_t xReturn;
|
|
size_t xBytesToStoreMessageLength;
|
|
const StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* This generic version of the receive function is used by both message
|
|
* buffers, which store discrete messages, and stream buffers, which store a
|
|
* continuous stream of bytes. Discrete messages include an additional
|
|
* sbBYTES_TO_STORE_MESSAGE_LENGTH bytes that hold the length of the message. */
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
xBytesToStoreMessageLength = sbBYTES_TO_STORE_MESSAGE_LENGTH;
|
|
}
|
|
else
|
|
{
|
|
xBytesToStoreMessageLength = 0;
|
|
}
|
|
|
|
/* True if the available space equals zero. */
|
|
if( xStreamBufferSpacesAvailable( xStreamBuffer ) <= xBytesToStoreMessageLength )
|
|
{
|
|
xReturn = pdTRUE;
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFALSE;
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
BaseType_t xStreamBufferSendCompletedFromISR( StreamBufferHandle_t xStreamBuffer,
|
|
BaseType_t * pxHigherPriorityTaskWoken )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
BaseType_t xReturn;
|
|
UBaseType_t uxSavedInterruptStatus;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
uxSavedInterruptStatus = ( UBaseType_t ) portSET_INTERRUPT_MASK_FROM_ISR();
|
|
{
|
|
if( ( pxStreamBuffer )->xTaskWaitingToReceive != NULL )
|
|
{
|
|
( void ) xTaskNotifyFromISR( ( pxStreamBuffer )->xTaskWaitingToReceive,
|
|
( uint32_t ) 0,
|
|
eNoAction,
|
|
pxHigherPriorityTaskWoken );
|
|
( pxStreamBuffer )->xTaskWaitingToReceive = NULL;
|
|
xReturn = pdTRUE;
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFALSE;
|
|
}
|
|
}
|
|
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
BaseType_t xStreamBufferReceiveCompletedFromISR( StreamBufferHandle_t xStreamBuffer,
|
|
BaseType_t * pxHigherPriorityTaskWoken )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
BaseType_t xReturn;
|
|
UBaseType_t uxSavedInterruptStatus;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
uxSavedInterruptStatus = ( UBaseType_t ) portSET_INTERRUPT_MASK_FROM_ISR();
|
|
{
|
|
if( ( pxStreamBuffer )->xTaskWaitingToSend != NULL )
|
|
{
|
|
( void ) xTaskNotifyFromISR( ( pxStreamBuffer )->xTaskWaitingToSend,
|
|
( uint32_t ) 0,
|
|
eNoAction,
|
|
pxHigherPriorityTaskWoken );
|
|
( pxStreamBuffer )->xTaskWaitingToSend = NULL;
|
|
xReturn = pdTRUE;
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFALSE;
|
|
}
|
|
}
|
|
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static size_t prvWriteBytesToBuffer( StreamBuffer_t * const pxStreamBuffer,
|
|
const uint8_t * pucData,
|
|
size_t xCount )
|
|
{
|
|
size_t xNextHead, xFirstLength;
|
|
|
|
configASSERT( xCount > ( size_t ) 0 );
|
|
|
|
xNextHead = pxStreamBuffer->xHead;
|
|
|
|
/* Calculate the number of bytes that can be added in the first write -
|
|
* which may be less than the total number of bytes that need to be added if
|
|
* the buffer will wrap back to the beginning. */
|
|
xFirstLength = configMIN( pxStreamBuffer->xLength - xNextHead, xCount );
|
|
|
|
/* Write as many bytes as can be written in the first write. */
|
|
configASSERT( ( xNextHead + xFirstLength ) <= pxStreamBuffer->xLength );
|
|
( void ) memcpy( ( void * ) ( &( pxStreamBuffer->pucBuffer[ xNextHead ] ) ), ( const void * ) pucData, xFirstLength ); /*lint !e9087 memcpy() requires void *. */
|
|
|
|
/* If the number of bytes written was less than the number that could be
|
|
* written in the first write... */
|
|
if( xCount > xFirstLength )
|
|
{
|
|
/* ...then write the remaining bytes to the start of the buffer. */
|
|
configASSERT( ( xCount - xFirstLength ) <= pxStreamBuffer->xLength );
|
|
( void ) memcpy( ( void * ) pxStreamBuffer->pucBuffer, ( const void * ) &( pucData[ xFirstLength ] ), xCount - xFirstLength ); /*lint !e9087 memcpy() requires void *. */
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
xNextHead += xCount;
|
|
|
|
if( xNextHead >= pxStreamBuffer->xLength )
|
|
{
|
|
xNextHead -= pxStreamBuffer->xLength;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
pxStreamBuffer->xHead = xNextHead;
|
|
|
|
return xCount;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static size_t prvReadBytesFromBuffer( StreamBuffer_t * pxStreamBuffer,
|
|
uint8_t * pucData,
|
|
size_t xMaxCount,
|
|
size_t xBytesAvailable )
|
|
{
|
|
size_t xCount, xFirstLength, xNextTail;
|
|
|
|
/* Use the minimum of the wanted bytes and the available bytes. */
|
|
xCount = configMIN( xBytesAvailable, xMaxCount );
|
|
|
|
if( xCount > ( size_t ) 0 )
|
|
{
|
|
xNextTail = pxStreamBuffer->xTail;
|
|
|
|
/* Calculate the number of bytes that can be read - which may be
|
|
* less than the number wanted if the data wraps around to the start of
|
|
* the buffer. */
|
|
xFirstLength = configMIN( pxStreamBuffer->xLength - xNextTail, xCount );
|
|
|
|
/* Obtain the number of bytes it is possible to obtain in the first
|
|
* read. Asserts check bounds of read and write. */
|
|
configASSERT( xFirstLength <= xMaxCount );
|
|
configASSERT( ( xNextTail + xFirstLength ) <= pxStreamBuffer->xLength );
|
|
( void ) memcpy( ( void * ) pucData, ( const void * ) &( pxStreamBuffer->pucBuffer[ xNextTail ] ), xFirstLength ); /*lint !e9087 memcpy() requires void *. */
|
|
|
|
/* If the total number of wanted bytes is greater than the number
|
|
* that could be read in the first read... */
|
|
if( xCount > xFirstLength )
|
|
{
|
|
/*...then read the remaining bytes from the start of the buffer. */
|
|
configASSERT( xCount <= xMaxCount );
|
|
( void ) memcpy( ( void * ) &( pucData[ xFirstLength ] ), ( void * ) ( pxStreamBuffer->pucBuffer ), xCount - xFirstLength ); /*lint !e9087 memcpy() requires void *. */
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
/* Move the tail pointer to effectively remove the data read from
|
|
* the buffer. */
|
|
xNextTail += xCount;
|
|
|
|
if( xNextTail >= pxStreamBuffer->xLength )
|
|
{
|
|
xNextTail -= pxStreamBuffer->xLength;
|
|
}
|
|
|
|
pxStreamBuffer->xTail = xNextTail;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
return xCount;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static size_t prvBytesInBuffer( const StreamBuffer_t * const pxStreamBuffer )
|
|
{
|
|
/* Returns the distance between xTail and xHead. */
|
|
size_t xCount;
|
|
|
|
xCount = pxStreamBuffer->xLength + pxStreamBuffer->xHead;
|
|
xCount -= pxStreamBuffer->xTail;
|
|
|
|
if( xCount >= pxStreamBuffer->xLength )
|
|
{
|
|
xCount -= pxStreamBuffer->xLength;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
return xCount;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvInitialiseNewStreamBuffer( StreamBuffer_t * const pxStreamBuffer,
|
|
uint8_t * const pucBuffer,
|
|
size_t xBufferSizeBytes,
|
|
size_t xTriggerLevelBytes,
|
|
uint8_t ucFlags )
|
|
{
|
|
/* Assert here is deliberately writing to the entire buffer to ensure it can
|
|
* be written to without generating exceptions, and is setting the buffer to a
|
|
* known value to assist in development/debugging. */
|
|
#if ( configASSERT_DEFINED == 1 )
|
|
{
|
|
/* The value written just has to be identifiable when looking at the
|
|
* memory. Don't use 0xA5 as that is the stack fill value and could
|
|
* result in confusion as to what is actually being observed. */
|
|
const BaseType_t xWriteValue = 0x55;
|
|
configASSERT( memset( pucBuffer, ( int ) xWriteValue, xBufferSizeBytes ) == pucBuffer );
|
|
} /*lint !e529 !e438 xWriteValue is only used if configASSERT() is defined. */
|
|
#endif
|
|
|
|
( void ) memset( ( void * ) pxStreamBuffer, 0x00, sizeof( StreamBuffer_t ) ); /*lint !e9087 memset() requires void *. */
|
|
pxStreamBuffer->pucBuffer = pucBuffer;
|
|
pxStreamBuffer->xLength = xBufferSizeBytes;
|
|
pxStreamBuffer->xTriggerLevelBytes = xTriggerLevelBytes;
|
|
pxStreamBuffer->ucFlags = ucFlags;
|
|
}
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
|
|
UBaseType_t uxStreamBufferGetStreamBufferNumber( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
return xStreamBuffer->uxStreamBufferNumber;
|
|
}
|
|
|
|
#endif /* configUSE_TRACE_FACILITY */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
|
|
void vStreamBufferSetStreamBufferNumber( StreamBufferHandle_t xStreamBuffer,
|
|
UBaseType_t uxStreamBufferNumber )
|
|
{
|
|
xStreamBuffer->uxStreamBufferNumber = uxStreamBufferNumber;
|
|
}
|
|
|
|
#endif /* configUSE_TRACE_FACILITY */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
|
|
uint8_t ucStreamBufferGetStreamBufferType( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
return( xStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER );
|
|
}
|
|
|
|
#endif /* configUSE_TRACE_FACILITY */
|
|
/*-----------------------------------------------------------*/
|