1428 lines
60 KiB
C
1428 lines
60 KiB
C
/*
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* FreeRTOS Kernel V10.5.1
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* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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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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#if ( INCLUDE_xTaskGetCurrentTaskHandle != 1 )
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#error INCLUDE_xTaskGetCurrentTaskHandle 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, then 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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/* If user has provided a per-instance receive complete callback, then
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* invoke the callback else use the receive complete macro which is provided by default for all instances.
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*/
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#if ( configUSE_SB_COMPLETED_CALLBACK == 1 )
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#define prvRECEIVE_COMPLETED( pxStreamBuffer ) \
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{ \
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if( ( pxStreamBuffer )->pxReceiveCompletedCallback != NULL ) \
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{ \
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( pxStreamBuffer )->pxReceiveCompletedCallback( ( pxStreamBuffer ), pdFALSE, NULL ); \
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} \
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else \
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{ \
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sbRECEIVE_COMPLETED( ( pxStreamBuffer ) ); \
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} \
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}
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#else /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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#define prvRECEIVE_COMPLETED( pxStreamBuffer ) sbRECEIVE_COMPLETED( ( pxStreamBuffer ) )
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#endif /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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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 ( configUSE_SB_COMPLETED_CALLBACK == 1 )
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#define prvRECEIVE_COMPLETED_FROM_ISR( pxStreamBuffer, \
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pxHigherPriorityTaskWoken ) \
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{ \
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if( ( pxStreamBuffer )->pxReceiveCompletedCallback != NULL ) \
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{ \
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( pxStreamBuffer )->pxReceiveCompletedCallback( ( pxStreamBuffer ), pdTRUE, ( pxHigherPriorityTaskWoken ) ); \
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} \
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else \
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{ \
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sbRECEIVE_COMPLETED_FROM_ISR( ( pxStreamBuffer ), ( pxHigherPriorityTaskWoken ) ); \
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} \
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}
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#else /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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#define prvRECEIVE_COMPLETED_FROM_ISR( pxStreamBuffer, pxHigherPriorityTaskWoken ) \
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sbRECEIVE_COMPLETED_FROM_ISR( ( pxStreamBuffer ), ( pxHigherPriorityTaskWoken ) )
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#endif /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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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, then provide a default
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* implementation that uses task notifications.
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*/
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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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/* If user has provided a per-instance send completed callback, then
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* invoke the callback else use the send complete macro which is provided by default for all instances.
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*/
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#if ( configUSE_SB_COMPLETED_CALLBACK == 1 )
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#define prvSEND_COMPLETED( pxStreamBuffer ) \
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{ \
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if( ( pxStreamBuffer )->pxSendCompletedCallback != NULL ) \
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{ \
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pxStreamBuffer->pxSendCompletedCallback( ( pxStreamBuffer ), pdFALSE, NULL ); \
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} \
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else \
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{ \
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sbSEND_COMPLETED( ( pxStreamBuffer ) ); \
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} \
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}
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#else /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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#define prvSEND_COMPLETED( pxStreamBuffer ) sbSEND_COMPLETED( ( pxStreamBuffer ) )
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#endif /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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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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#if ( configUSE_SB_COMPLETED_CALLBACK == 1 )
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#define prvSEND_COMPLETE_FROM_ISR( pxStreamBuffer, pxHigherPriorityTaskWoken ) \
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{ \
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if( ( pxStreamBuffer )->pxSendCompletedCallback != NULL ) \
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{ \
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( pxStreamBuffer )->pxSendCompletedCallback( ( pxStreamBuffer ), pdTRUE, ( pxHigherPriorityTaskWoken ) ); \
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} \
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else \
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{ \
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sbSEND_COMPLETE_FROM_ISR( ( pxStreamBuffer ), ( pxHigherPriorityTaskWoken ) ); \
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} \
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}
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#else /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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#define prvSEND_COMPLETE_FROM_ISR( pxStreamBuffer, pxHigherPriorityTaskWoken ) \
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sbSEND_COMPLETE_FROM_ISR( ( pxStreamBuffer ), ( pxHigherPriorityTaskWoken ) )
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#endif /* if ( configUSE_SB_COMPLETED_CALLBACK == 1 ) */
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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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#if ( configUSE_SB_COMPLETED_CALLBACK == 1 )
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StreamBufferCallbackFunction_t pxSendCompletedCallback; /* Optional callback called on send complete. sbSEND_COMPLETED is called if this is NULL. */
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StreamBufferCallbackFunction_t pxReceiveCompletedCallback; /* Optional callback called on receive complete. sbRECEIVE_COMPLETED is called if this is NULL. */
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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's data storage area.
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* This function does not update the buffer's xHead pointer, so multiple writes
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* may be chained together "atomically". This is useful for Message Buffers where
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* the length and data bytes are written in two separate chunks, and we don't want
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* the reader to see the buffer as having grown until after all data is copied over.
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* This function takes a custom xHead value to indicate where to write to (necessary
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* for chaining) and returns the the resulting xHead position.
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* To mark the write as complete, manually set the buffer's xHead field with the
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* returned xHead from this function.
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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,
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size_t xHead ) 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 ) 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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* Copies xCount bytes from the pxStreamBuffer's data storage area to pucData.
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* This function does not update the buffer's xTail pointer, so multiple reads
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* may be chained together "atomically". This is useful for Message Buffers where
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* the length and data bytes are read in two separate chunks, and we don't want
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* the writer to see the buffer as having more free space until after all data is
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* copied over, especially if we have to abort the read due to insufficient receiving space.
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* This function takes a custom xTail value to indicate where to read from (necessary
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* for chaining) and returns the the resulting xTail position.
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* To mark the read as complete, manually set the buffer's xTail field with the
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* returned xTail from this function.
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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 xCount,
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size_t xTail ) 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,
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StreamBufferCallbackFunction_t pxSendCompletedCallback,
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StreamBufferCallbackFunction_t pxReceiveCompletedCallback ) 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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StreamBufferCallbackFunction_t pxSendCompletedCallback,
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StreamBufferCallbackFunction_t pxReceiveCompletedCallback )
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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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pxSendCompletedCallback,
|
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pxReceiveCompletedCallback );
|
|
|
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traceSTREAM_BUFFER_CREATE( ( ( StreamBuffer_t * ) pucAllocatedMemory ), xIsMessageBuffer );
|
|
}
|
|
else
|
|
{
|
|
traceSTREAM_BUFFER_CREATE_FAILED( xIsMessageBuffer );
|
|
}
|
|
|
|
return ( StreamBufferHandle_t ) pucAllocatedMemory; /*lint !e9087 !e826 Safe cast as allocated memory is aligned. */
|
|
}
|
|
#endif /* configSUPPORT_DYNAMIC_ALLOCATION */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( configSUPPORT_STATIC_ALLOCATION == 1 )
|
|
|
|
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,
|
|
StaticStreamBuffer_t * const pxStaticStreamBuffer,
|
|
StreamBufferCallbackFunction_t pxSendCompletedCallback,
|
|
StreamBufferCallbackFunction_t pxReceiveCompletedCallback )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = ( StreamBuffer_t * ) pxStaticStreamBuffer; /*lint !e740 !e9087 Safe cast as StaticStreamBuffer_t is opaque Streambuffer_t. */
|
|
StreamBufferHandle_t xReturn;
|
|
uint8_t ucFlags;
|
|
|
|
configASSERT( pucStreamBufferStorageArea );
|
|
configASSERT( pxStaticStreamBuffer );
|
|
configASSERT( xTriggerLevelBytes <= xBufferSizeBytes );
|
|
|
|
/* A trigger level of 0 would cause a waiting task to unblock even when
|
|
* the buffer was empty. */
|
|
if( xTriggerLevelBytes == ( size_t ) 0 )
|
|
{
|
|
xTriggerLevelBytes = ( size_t ) 1;
|
|
}
|
|
|
|
if( xIsMessageBuffer != pdFALSE )
|
|
{
|
|
/* Statically allocated message buffer. */
|
|
ucFlags = sbFLAGS_IS_MESSAGE_BUFFER | sbFLAGS_IS_STATICALLY_ALLOCATED;
|
|
}
|
|
else
|
|
{
|
|
/* Statically allocated stream buffer. */
|
|
ucFlags = sbFLAGS_IS_STATICALLY_ALLOCATED;
|
|
}
|
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|
|
/* In case the stream buffer is going to be used as a message buffer
|
|
* (that is, it will hold discrete messages with a little meta data that
|
|
* says how big the next message is) check the buffer will be large enough
|
|
* to hold at least one message. */
|
|
configASSERT( xBufferSizeBytes > sbBYTES_TO_STORE_MESSAGE_LENGTH );
|
|
|
|
#if ( configASSERT_DEFINED == 1 )
|
|
{
|
|
/* Sanity check that the size of the structure used to declare a
|
|
* variable of type StaticStreamBuffer_t equals the size of the real
|
|
* message buffer structure. */
|
|
volatile size_t xSize = sizeof( StaticStreamBuffer_t );
|
|
configASSERT( xSize == sizeof( StreamBuffer_t ) );
|
|
} /*lint !e529 xSize is referenced is configASSERT() is defined. */
|
|
#endif /* configASSERT_DEFINED */
|
|
|
|
if( ( pucStreamBufferStorageArea != NULL ) && ( pxStaticStreamBuffer != NULL ) )
|
|
{
|
|
prvInitialiseNewStreamBuffer( pxStreamBuffer,
|
|
pucStreamBufferStorageArea,
|
|
xBufferSizeBytes,
|
|
xTriggerLevelBytes,
|
|
ucFlags,
|
|
pxSendCompletedCallback,
|
|
pxReceiveCompletedCallback );
|
|
|
|
/* Remember this was statically allocated in case it is ever deleted
|
|
* again. */
|
|
pxStreamBuffer->ucFlags |= sbFLAGS_IS_STATICALLY_ALLOCATED;
|
|
|
|
traceSTREAM_BUFFER_CREATE( pxStreamBuffer, xIsMessageBuffer );
|
|
|
|
xReturn = ( StreamBufferHandle_t ) pxStaticStreamBuffer; /*lint !e9087 Data hiding requires cast to opaque type. */
|
|
}
|
|
else
|
|
{
|
|
xReturn = NULL;
|
|
traceSTREAM_BUFFER_CREATE_STATIC_FAILED( xReturn, xIsMessageBuffer );
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
#endif /* ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vStreamBufferDelete( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
StreamBuffer_t * pxStreamBuffer = xStreamBuffer;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
traceSTREAM_BUFFER_DELETE( xStreamBuffer );
|
|
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_STATICALLY_ALLOCATED ) == ( uint8_t ) pdFALSE )
|
|
{
|
|
#if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
|
|
{
|
|
/* Both the structure and the buffer were allocated using a single call
|
|
* to pvPortMalloc(), hence only one call to vPortFree() is required. */
|
|
vPortFree( ( void * ) pxStreamBuffer ); /*lint !e9087 Standard free() semantics require void *, plus pxStreamBuffer was allocated by pvPortMalloc(). */
|
|
}
|
|
#else
|
|
{
|
|
/* Should not be possible to get here, ucFlags must be corrupt.
|
|
* Force an assert. */
|
|
configASSERT( xStreamBuffer == ( StreamBufferHandle_t ) ~0 );
|
|
}
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
/* The structure and buffer were not allocated dynamically and cannot be
|
|
* freed - just scrub the structure so future use will assert. */
|
|
( void ) memset( pxStreamBuffer, 0x00, sizeof( StreamBuffer_t ) );
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
BaseType_t xStreamBufferReset( StreamBufferHandle_t xStreamBuffer )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
BaseType_t xReturn = pdFAIL;
|
|
StreamBufferCallbackFunction_t pxSendCallback = NULL, pxReceiveCallback = NULL;
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
UBaseType_t uxStreamBufferNumber;
|
|
#endif
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
{
|
|
/* Store the stream buffer number so it can be restored after the
|
|
* reset. */
|
|
uxStreamBufferNumber = pxStreamBuffer->uxStreamBufferNumber;
|
|
}
|
|
#endif
|
|
|
|
/* Can only reset a message buffer if there are no tasks blocked on it. */
|
|
taskENTER_CRITICAL();
|
|
{
|
|
if( ( pxStreamBuffer->xTaskWaitingToReceive == NULL ) && ( pxStreamBuffer->xTaskWaitingToSend == NULL ) )
|
|
{
|
|
#if ( configUSE_SB_COMPLETED_CALLBACK == 1 )
|
|
{
|
|
pxSendCallback = pxStreamBuffer->pxSendCompletedCallback;
|
|
pxReceiveCallback = pxStreamBuffer->pxReceiveCompletedCallback;
|
|
}
|
|
#endif
|
|
|
|
prvInitialiseNewStreamBuffer( pxStreamBuffer,
|
|
pxStreamBuffer->pucBuffer,
|
|
pxStreamBuffer->xLength,
|
|
pxStreamBuffer->xTriggerLevelBytes,
|
|
pxStreamBuffer->ucFlags,
|
|
pxSendCallback,
|
|
pxReceiveCallback );
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
{
|
|
pxStreamBuffer->uxStreamBufferNumber = uxStreamBufferNumber;
|
|
}
|
|
#endif
|
|
|
|
traceSTREAM_BUFFER_RESET( xStreamBuffer );
|
|
|
|
xReturn = pdPASS;
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
BaseType_t xStreamBufferSetTriggerLevel( StreamBufferHandle_t xStreamBuffer,
|
|
size_t xTriggerLevel )
|
|
{
|
|
StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
|
|
BaseType_t xReturn;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* 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;
|
|
size_t xOriginalTail;
|
|
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* The code below reads xTail and then xHead. This is safe if the stream
|
|
* buffer is updated once between the two reads - but not if the stream buffer
|
|
* is updated more than once between the two reads - hence the loop. */
|
|
do
|
|
{
|
|
xOriginalTail = pxStreamBuffer->xTail;
|
|
xSpace = pxStreamBuffer->xLength + pxStreamBuffer->xTail;
|
|
xSpace -= pxStreamBuffer->xHead;
|
|
} while( xOriginalTail != pxStreamBuffer->xTail );
|
|
|
|
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;
|
|
size_t xMaxReportedSpace = 0;
|
|
|
|
configASSERT( pvTxData );
|
|
configASSERT( pxStreamBuffer );
|
|
|
|
/* The maximum amount of space a stream buffer will ever report is its length
|
|
* minus 1. */
|
|
xMaxReportedSpace = pxStreamBuffer->xLength - ( size_t ) 1;
|
|
|
|
/* 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 )
|
|
{
|
|
prvSEND_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 )
|
|
{
|
|
prvSEND_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 )
|
|
{
|
|
size_t xNextHead = pxStreamBuffer->xHead;
|
|
configMESSAGE_BUFFER_LENGTH_TYPE xMessageLength;
|
|
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
/* This is a message buffer, as opposed to a stream buffer. */
|
|
|
|
/* Convert xDataLengthBytes to the message length type. */
|
|
xMessageLength = ( configMESSAGE_BUFFER_LENGTH_TYPE ) xDataLengthBytes;
|
|
|
|
/* Ensure the data length given fits within configMESSAGE_BUFFER_LENGTH_TYPE. */
|
|
configASSERT( ( size_t ) xMessageLength == xDataLengthBytes );
|
|
|
|
if( xSpace >= xRequiredSpace )
|
|
{
|
|
/* 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. */
|
|
xNextHead = prvWriteBytesToBuffer( pxStreamBuffer, ( const uint8_t * ) &( xMessageLength ), sbBYTES_TO_STORE_MESSAGE_LENGTH, xNextHead );
|
|
}
|
|
else
|
|
{
|
|
/* Not enough space, so do not write data to the buffer. */
|
|
xDataLengthBytes = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* This is a stream buffer, as opposed to a message buffer, so writing a
|
|
* stream of bytes rather than discrete messages. Plan to write as many
|
|
* bytes as possible. */
|
|
xDataLengthBytes = configMIN( xDataLengthBytes, xSpace );
|
|
}
|
|
|
|
if( xDataLengthBytes != ( size_t ) 0 )
|
|
{
|
|
/* Write the data to the buffer. */
|
|
pxStreamBuffer->xHead = prvWriteBytesToBuffer( pxStreamBuffer, ( const uint8_t * ) pvTxData, xDataLengthBytes, xNextHead ); /*lint !e9079 Storage buffer is implemented as uint8_t for ease of sizing, alignment and access. */
|
|
}
|
|
|
|
return xDataLengthBytes;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
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 );
|
|
|
|
/* Was a task waiting for space in the buffer? */
|
|
if( xReceivedLength != ( size_t ) 0 )
|
|
{
|
|
traceSTREAM_BUFFER_RECEIVE( xStreamBuffer, xReceivedLength );
|
|
prvRECEIVE_COMPLETED( xStreamBuffer );
|
|
}
|
|
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;
|
|
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. */
|
|
( void ) prvReadBytesFromBuffer( pxStreamBuffer, ( uint8_t * ) &xTempReturn, sbBYTES_TO_STORE_MESSAGE_LENGTH, pxStreamBuffer->xTail );
|
|
xReturn = ( size_t ) xTempReturn;
|
|
}
|
|
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 );
|
|
|
|
/* Was a task waiting for space in the buffer? */
|
|
if( xReceivedLength != ( size_t ) 0 )
|
|
{
|
|
prvRECEIVE_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 xCount, xNextMessageLength;
|
|
configMESSAGE_BUFFER_LENGTH_TYPE xTempNextMessageLength;
|
|
size_t xNextTail = pxStreamBuffer->xTail;
|
|
|
|
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
|
|
{
|
|
/* A discrete message is being received. First receive the length
|
|
* of the message. */
|
|
xNextTail = prvReadBytesFromBuffer( pxStreamBuffer, ( uint8_t * ) &xTempNextMessageLength, sbBYTES_TO_STORE_MESSAGE_LENGTH, xNextTail );
|
|
xNextMessageLength = ( size_t ) xTempNextMessageLength;
|
|
|
|
/* Reduce the number of bytes available by the number of bytes just
|
|
* read out. */
|
|
xBytesAvailable -= sbBYTES_TO_STORE_MESSAGE_LENGTH;
|
|
|
|
/* 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. */
|
|
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;
|
|
}
|
|
|
|
/* Use the minimum of the wanted bytes and the available bytes. */
|
|
xCount = configMIN( xNextMessageLength, xBytesAvailable );
|
|
|
|
if( xCount != ( size_t ) 0 )
|
|
{
|
|
/* Read the actual data and update the tail to mark the data as officially consumed. */
|
|
pxStreamBuffer->xTail = prvReadBytesFromBuffer( pxStreamBuffer, ( uint8_t * ) pvRxData, xCount, xNextTail ); /*lint !e9079 Data storage area is implemented as uint8_t array for ease of sizing, indexing and alignment. */
|
|
}
|
|
|
|
return xCount;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
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 xHead )
|
|
{
|
|
size_t xFirstLength;
|
|
|
|
configASSERT( xCount > ( size_t ) 0 );
|
|
|
|
/* 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 - xHead, xCount );
|
|
|
|
/* Write as many bytes as can be written in the first write. */
|
|
configASSERT( ( xHead + xFirstLength ) <= pxStreamBuffer->xLength );
|
|
( void ) memcpy( ( void * ) ( &( pxStreamBuffer->pucBuffer[ xHead ] ) ), ( 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();
|
|
}
|
|
|
|
xHead += xCount;
|
|
|
|
if( xHead >= pxStreamBuffer->xLength )
|
|
{
|
|
xHead -= pxStreamBuffer->xLength;
|
|
}
|
|
else
|
|
{
|
|
mtCOVERAGE_TEST_MARKER();
|
|
}
|
|
|
|
return xHead;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static size_t prvReadBytesFromBuffer( StreamBuffer_t * pxStreamBuffer,
|
|
uint8_t * pucData,
|
|
size_t xCount,
|
|
size_t xTail )
|
|
{
|
|
size_t xFirstLength;
|
|
|
|
configASSERT( xCount != ( size_t ) 0 );
|
|
|
|
/* 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 - xTail, xCount );
|
|
|
|
/* Obtain the number of bytes it is possible to obtain in the first
|
|
* read. Asserts check bounds of read and write. */
|
|
configASSERT( xFirstLength <= xCount );
|
|
configASSERT( ( xTail + xFirstLength ) <= pxStreamBuffer->xLength );
|
|
( void ) memcpy( ( void * ) pucData, ( const void * ) &( pxStreamBuffer->pucBuffer[ xTail ] ), 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. */
|
|
( 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. */
|
|
xTail += xCount;
|
|
|
|
if( xTail >= pxStreamBuffer->xLength )
|
|
{
|
|
xTail -= pxStreamBuffer->xLength;
|
|
}
|
|
|
|
return xTail;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
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,
|
|
StreamBufferCallbackFunction_t pxSendCompletedCallback,
|
|
StreamBufferCallbackFunction_t pxReceiveCompletedCallback )
|
|
{
|
|
/* 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_SB_COMPLETED_CALLBACK == 1 )
|
|
{
|
|
pxStreamBuffer->pxSendCompletedCallback = pxSendCompletedCallback;
|
|
pxStreamBuffer->pxReceiveCompletedCallback = pxReceiveCompletedCallback;
|
|
}
|
|
#else
|
|
{
|
|
( void ) pxSendCompletedCallback;
|
|
( void ) pxReceiveCompletedCallback;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#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 */
|
|
/*-----------------------------------------------------------*/
|