From d291e583a5ee10f13b0f4039a8d114e15799eb7b Mon Sep 17 00:00:00 2001 From: Pixel Date: Sun, 23 Jan 2011 12:15:10 -0800 Subject: Adding basic FreeRTOS sourcetree; v6.1.1 currently. --- FreeRTOS/Source/portable/MemMang/heap_1.c | 152 ++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) create mode 100644 FreeRTOS/Source/portable/MemMang/heap_1.c (limited to 'FreeRTOS/Source/portable/MemMang/heap_1.c') diff --git a/FreeRTOS/Source/portable/MemMang/heap_1.c b/FreeRTOS/Source/portable/MemMang/heap_1.c new file mode 100644 index 0000000..70a6bb1 --- /dev/null +++ b/FreeRTOS/Source/portable/MemMang/heap_1.c @@ -0,0 +1,152 @@ +/* + FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd. + + *************************************************************************** + * * + * If you are: * + * * + * + New to FreeRTOS, * + * + Wanting to learn FreeRTOS or multitasking in general quickly * + * + Looking for basic training, * + * + Wanting to improve your FreeRTOS skills and productivity * + * * + * then take a look at the FreeRTOS books - available as PDF or paperback * + * * + * "Using the FreeRTOS Real Time Kernel - a Practical Guide" * + * http://www.FreeRTOS.org/Documentation * + * * + * A pdf reference manual is also available. Both are usually delivered * + * to your inbox within 20 minutes to two hours when purchased between 8am * + * and 8pm GMT (although please allow up to 24 hours in case of * + * exceptional circumstances). Thank you for your support! * + * * + *************************************************************************** + + This file is part of the FreeRTOS distribution. + + FreeRTOS is free software; you can redistribute it and/or modify it under + the terms of the GNU General Public License (version 2) as published by the + Free Software Foundation AND MODIFIED BY the FreeRTOS exception. + ***NOTE*** The exception to the GPL is included to allow you to distribute + a combined work that includes FreeRTOS without being obliged to provide the + source code for proprietary components outside of the FreeRTOS kernel. + FreeRTOS is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + more details. You should have received a copy of the GNU General Public + License and the FreeRTOS license exception along with FreeRTOS; if not it + can be viewed here: http://www.freertos.org/a00114.html and also obtained + by writing to Richard Barry, contact details for whom are available on the + FreeRTOS WEB site. + + 1 tab == 4 spaces! + + http://www.FreeRTOS.org - Documentation, latest information, license and + contact details. + + http://www.SafeRTOS.com - A version that is certified for use in safety + critical systems. + + http://www.OpenRTOS.com - Commercial support, development, porting, + licensing and training services. +*/ + + +/* + * The simplest possible implementation of pvPortMalloc(). Note that this + * implementation does NOT allow allocated memory to be freed again. + * + * See heap_2.c and heap_3.c for alternative implementations, and the memory + * management pages of http://www.FreeRTOS.org for more information. + */ +#include + +/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining +all the API functions to use the MPU wrappers. That should only be done when +task.h is included from an application file. */ +#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE + +#include "FreeRTOS.h" +#include "task.h" + +#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE + +/* Allocate the memory for the heap. The struct is used to force byte +alignment without using any non-portable code. */ +static union xRTOS_HEAP +{ + #if portBYTE_ALIGNMENT == 8 + volatile portDOUBLE dDummy; + #else + volatile unsigned long ulDummy; + #endif + unsigned char ucHeap[ configTOTAL_HEAP_SIZE ]; +} xHeap; + +static size_t xNextFreeByte = ( size_t ) 0; +/*-----------------------------------------------------------*/ + +void *pvPortMalloc( size_t xWantedSize ) +{ +void *pvReturn = NULL; + + /* Ensure that blocks are always aligned to the required number of bytes. */ + #if portBYTE_ALIGNMENT != 1 + if( xWantedSize & portBYTE_ALIGNMENT_MASK ) + { + /* Byte alignment required. */ + xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) ); + } + #endif + + vTaskSuspendAll(); + { + /* Check there is enough room left for the allocation. */ + if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) && + ( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */ + { + /* Return the next free byte then increment the index past this + block. */ + pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] ); + xNextFreeByte += xWantedSize; + } + } + xTaskResumeAll(); + + #if( configUSE_MALLOC_FAILED_HOOK == 1 ) + { + if( pvReturn == NULL ) + { + extern void vApplicationMallocFailedHook( void ); + vApplicationMallocFailedHook(); + } + } + #endif + + return pvReturn; +} +/*-----------------------------------------------------------*/ + +void vPortFree( void *pv ) +{ + /* Memory cannot be freed using this scheme. See heap_2.c and heap_3.c + for alternative implementations, and the memory management pages of + http://www.FreeRTOS.org for more information. */ + ( void ) pv; +} +/*-----------------------------------------------------------*/ + +void vPortInitialiseBlocks( void ) +{ + /* Only required when static memory is not cleared. */ + xNextFreeByte = ( size_t ) 0; +} +/*-----------------------------------------------------------*/ + +size_t xPortGetFreeHeapSize( void ) +{ + return ( configTOTAL_HEAP_SIZE - xNextFreeByte ); +} + + + -- cgit v1.2.3