2 FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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69 * The simplest possible implementation of pvPortMalloc(). Note that this
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70 * implementation does NOT allow allocated memory to be freed again.
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72 * See heap_2.c, heap_3.c and heap_4.c for alternative implementations, and the
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73 * memory management pages of http://www.FreeRTOS.org for more information.
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77 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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78 all the API functions to use the MPU wrappers. That should only be done when
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79 task.h is included from an application file. */
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80 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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82 #include "FreeRTOS.h"
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85 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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87 /* Allocate the memory for the heap. The struct is used to force byte
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88 alignment without using any non-portable code. */
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89 static union xRTOS_HEAP
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91 #if portBYTE_ALIGNMENT == 8
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92 volatile portDOUBLE dDummy;
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94 volatile unsigned long ulDummy;
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96 unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];
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99 static size_t xNextFreeByte = ( size_t ) 0;
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100 /*-----------------------------------------------------------*/
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102 void *pvPortMalloc( size_t xWantedSize )
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104 void *pvReturn = NULL;
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106 /* Ensure that blocks are always aligned to the required number of bytes. */
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107 #if portBYTE_ALIGNMENT != 1
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108 if( xWantedSize & portBYTE_ALIGNMENT_MASK )
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110 /* Byte alignment required. */
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111 xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
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117 /* Check there is enough room left for the allocation. */
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118 if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) &&
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119 ( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
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121 /* Return the next free byte then increment the index past this
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123 pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] );
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124 xNextFreeByte += xWantedSize;
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129 #if( configUSE_MALLOC_FAILED_HOOK == 1 )
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131 if( pvReturn == NULL )
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133 extern void vApplicationMallocFailedHook( void );
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134 vApplicationMallocFailedHook();
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141 /*-----------------------------------------------------------*/
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143 void vPortFree( void *pv )
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145 /* Memory cannot be freed using this scheme. See heap_2.c, heap_3.c and
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146 heap_4.c for alternative implementations, and the memory management pages of
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147 http://www.FreeRTOS.org for more information. */
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150 /*-----------------------------------------------------------*/
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152 void vPortInitialiseBlocks( void )
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154 /* Only required when static memory is not cleared. */
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155 xNextFreeByte = ( size_t ) 0;
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157 /*-----------------------------------------------------------*/
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159 size_t xPortGetFreeHeapSize( void )
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161 return ( configTOTAL_HEAP_SIZE - xNextFreeByte );
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