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Add the Labs projects provided in the V10.2.1_191129 zip file.
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Richard Barry
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/*
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* FreeRTOS+TCP 191100 experimental
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* Copyright (C) 2018 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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* http://aws.amazon.com/freertos
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* http://www.FreeRTOS.org
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*/
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/*
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* FreeRTOS_Stream_Buffer.h
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*
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* A cicular character buffer
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* An implementation of a circular buffer without a length field
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* If LENGTH defines the size of the buffer, a maximum of (LENGT-1) bytes can be stored
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* In order to add or read data from the buffer, memcpy() will be called at most 2 times
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*/
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#ifndef FREERTOS_STREAM_BUFFER_H
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#define FREERTOS_STREAM_BUFFER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct xSTREAM_BUFFER {
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volatile size_t uxTail; /* next item to read */
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volatile size_t uxMid; /* iterator within the valid items */
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volatile size_t uxHead; /* next position store a new item */
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volatile size_t uxFront; /* iterator within the free space */
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size_t LENGTH; /* const value: number of reserved elements */
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uint8_t ucArray[ sizeof( size_t ) ];
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} StreamBuffer_t;
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static portINLINE void vStreamBufferClear( StreamBuffer_t *pxBuffer );
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static portINLINE void vStreamBufferClear( StreamBuffer_t *pxBuffer )
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{
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/* Make the circular buffer empty */
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pxBuffer->uxHead = 0u;
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pxBuffer->uxTail = 0u;
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pxBuffer->uxFront = 0u;
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pxBuffer->uxMid = 0u;
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}
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/*-----------------------------------------------------------*/
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static portINLINE size_t uxStreamBufferSpace( const StreamBuffer_t *pxBuffer, const size_t uxLower, const size_t uxUpper );
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static portINLINE size_t uxStreamBufferSpace( const StreamBuffer_t *pxBuffer, const size_t uxLower, const size_t uxUpper )
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{
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/* Returns the space between uxLower and uxUpper, which equals to the distance minus 1 */
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size_t uxCount;
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uxCount = pxBuffer->LENGTH + uxUpper - uxLower - 1u;
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if( uxCount >= pxBuffer->LENGTH )
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{
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uxCount -= pxBuffer->LENGTH;
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}
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return uxCount;
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}
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/*-----------------------------------------------------------*/
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static portINLINE size_t uxStreamBufferDistance( const StreamBuffer_t *pxBuffer, const size_t uxLower, const size_t uxUpper );
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static portINLINE size_t uxStreamBufferDistance( const StreamBuffer_t *pxBuffer, const size_t uxLower, const size_t uxUpper )
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{
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/* Returns the distance between uxLower and uxUpper */
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size_t uxCount;
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uxCount = pxBuffer->LENGTH + uxUpper - uxLower;
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if ( uxCount >= pxBuffer->LENGTH )
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{
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uxCount -= pxBuffer->LENGTH;
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}
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return uxCount;
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}
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/*-----------------------------------------------------------*/
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static portINLINE size_t uxStreamBufferGetSpace( const StreamBuffer_t *pxBuffer );
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static portINLINE size_t uxStreamBufferGetSpace( const StreamBuffer_t *pxBuffer )
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{
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/* Returns the number of items which can still be added to uxHead
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before hitting on uxTail */
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size_t uxHead = pxBuffer->uxHead;
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size_t uxTail = pxBuffer->uxTail;
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return uxStreamBufferSpace( pxBuffer, uxHead, uxTail );
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}
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/*-----------------------------------------------------------*/
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static portINLINE size_t uxStreamBufferFrontSpace( const StreamBuffer_t *pxBuffer );
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static portINLINE size_t uxStreamBufferFrontSpace( const StreamBuffer_t *pxBuffer )
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{
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/* Distance between uxFront and uxTail
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or the number of items which can still be added to uxFront,
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before hitting on uxTail */
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size_t uxFront = pxBuffer->uxFront;
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size_t uxTail = pxBuffer->uxTail;
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return uxStreamBufferSpace( pxBuffer, uxFront, uxTail );
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}
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/*-----------------------------------------------------------*/
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static portINLINE size_t uxStreamBufferGetSize( const StreamBuffer_t *pxBuffer );
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static portINLINE size_t uxStreamBufferGetSize( const StreamBuffer_t *pxBuffer )
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{
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/* Returns the number of items which can be read from uxTail
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before reaching uxHead */
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size_t uxHead = pxBuffer->uxHead;
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size_t uxTail = pxBuffer->uxTail;
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return uxStreamBufferDistance( pxBuffer, uxTail, uxHead );
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}
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/*-----------------------------------------------------------*/
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static portINLINE size_t uxStreamBufferMidSpace( const StreamBuffer_t *pxBuffer );
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static portINLINE size_t uxStreamBufferMidSpace( const StreamBuffer_t *pxBuffer )
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{
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/* Returns the distance between uxHead and uxMid */
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size_t uxHead = pxBuffer->uxHead;
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size_t uxMid = pxBuffer->uxMid;
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return uxStreamBufferDistance( pxBuffer, uxMid, uxHead );
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}
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/*-----------------------------------------------------------*/
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static portINLINE void vStreamBufferMoveMid( StreamBuffer_t *pxBuffer, size_t uxCount );
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static portINLINE void vStreamBufferMoveMid( StreamBuffer_t *pxBuffer, size_t uxCount )
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{
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/* Increment uxMid, but no further than uxHead */
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size_t uxSize = uxStreamBufferMidSpace( pxBuffer );
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if( uxCount > uxSize )
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{
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uxCount = uxSize;
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}
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pxBuffer->uxMid += uxCount;
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if( pxBuffer->uxMid >= pxBuffer->LENGTH )
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{
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pxBuffer->uxMid -= pxBuffer->LENGTH;
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}
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}
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/*-----------------------------------------------------------*/
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static portINLINE BaseType_t xStreamBufferIsEmpty( const StreamBuffer_t *pxBuffer );
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static portINLINE BaseType_t xStreamBufferIsEmpty( const StreamBuffer_t *pxBuffer )
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{
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BaseType_t xReturn;
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/* True if no item is available */
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if( pxBuffer->uxHead == pxBuffer->uxTail )
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{
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xReturn = pdTRUE;
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}
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else
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{
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xReturn = pdFALSE;
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}
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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static portINLINE BaseType_t xStreamBufferIsFull( const StreamBuffer_t *pxBuffer );
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static portINLINE BaseType_t xStreamBufferIsFull( const StreamBuffer_t *pxBuffer )
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{
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/* True if the available space equals zero. */
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return ( BaseType_t ) ( uxStreamBufferGetSpace( pxBuffer ) == 0u );
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}
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/*-----------------------------------------------------------*/
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static portINLINE BaseType_t xStreamBufferLessThenEqual( const StreamBuffer_t *pxBuffer, const size_t uxLeft, const size_t uxRight );
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static portINLINE BaseType_t xStreamBufferLessThenEqual( const StreamBuffer_t *pxBuffer, const size_t uxLeft, const size_t uxRight )
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{
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BaseType_t xReturn;
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size_t uxTail = pxBuffer->uxTail;
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/* Returns true if ( uxLeft < uxRight ) */
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if( ( uxLeft < uxTail ) ^ ( uxRight < uxTail ) )
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{
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if( uxRight < uxTail )
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{
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xReturn = pdTRUE;
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}
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else
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{
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xReturn = pdFALSE;
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}
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}
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else
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{
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if( uxLeft <= uxRight )
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{
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xReturn = pdTRUE;
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}
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else
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{
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xReturn = pdFALSE;
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}
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}
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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static portINLINE size_t uxStreamBufferGetPtr( StreamBuffer_t *pxBuffer, uint8_t **ppucData );
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static portINLINE size_t uxStreamBufferGetPtr( StreamBuffer_t *pxBuffer, uint8_t **ppucData )
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{
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size_t uxNextTail = pxBuffer->uxTail;
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size_t uxSize = uxStreamBufferGetSize( pxBuffer );
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*ppucData = pxBuffer->ucArray + uxNextTail;
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return FreeRTOS_min_uint32( uxSize, pxBuffer->LENGTH - uxNextTail );
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}
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/*
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* Add bytes to a stream buffer.
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*
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* pxBuffer - The buffer to which the bytes will be added.
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* uxOffset - If uxOffset > 0, data will be written at an offset from uxHead
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* while uxHead will not be moved yet.
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* pucData - A pointer to the data to be added.
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* uxCount - The number of bytes to add.
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*/
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size_t uxStreamBufferAdd( StreamBuffer_t *pxBuffer, size_t uxOffset, const uint8_t *pucData, size_t uxCount );
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/*
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* Read bytes from a stream buffer.
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*
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* pxBuffer - The buffer from which the bytes will be read.
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* uxOffset - Can be used to read data located at a certain offset from 'uxTail'.
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* pucData - A pointer to the buffer into which data will be read.
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* uxMaxCount - The number of bytes to read.
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* xPeek - If set to pdTRUE the data will remain in the buffer.
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*/
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size_t uxStreamBufferGet( StreamBuffer_t *pxBuffer, size_t uxOffset, uint8_t *pucData, size_t uxMaxCount, BaseType_t xPeek );
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* !defined( FREERTOS_STREAM_BUFFER_H ) */
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