2 FreeRTOS V8.1.0 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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68 * The simplest possible implementation of pvPortMalloc(). Note that this
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69 * implementation does NOT allow allocated memory to be freed again.
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71 * See heap_2.c, heap_3.c and heap_4.c for alternative implementations, and the
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72 * memory management pages of http://www.FreeRTOS.org for more information.
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76 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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77 all the API functions to use the MPU wrappers. That should only be done when
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78 task.h is included from an application file. */
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79 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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81 #include "FreeRTOS.h"
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84 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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86 /* A few bytes might be lost to byte aligning the heap start address. */
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87 #define configADJUSTED_HEAP_SIZE ( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
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89 /* Allocate the memory for the heap. */
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90 static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
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91 static size_t xNextFreeByte = ( size_t ) 0;
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93 /*-----------------------------------------------------------*/
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95 void *pvPortMalloc( size_t xWantedSize )
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97 void *pvReturn = NULL;
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98 static uint8_t *pucAlignedHeap = NULL;
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100 /* Ensure that blocks are always aligned to the required number of bytes. */
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101 #if portBYTE_ALIGNMENT != 1
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102 if( xWantedSize & portBYTE_ALIGNMENT_MASK )
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104 /* Byte alignment required. */
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105 xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
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111 if( pucAlignedHeap == NULL )
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113 /* Ensure the heap starts on a correctly aligned boundary. */
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114 pucAlignedHeap = ( uint8_t * ) ( ( ( portPOINTER_SIZE_TYPE ) &ucHeap[ portBYTE_ALIGNMENT ] ) & ( ( portPOINTER_SIZE_TYPE ) ~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 ) < configADJUSTED_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 = pucAlignedHeap + xNextFreeByte;
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124 xNextFreeByte += xWantedSize;
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127 traceMALLOC( pvReturn, xWantedSize );
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129 ( void ) xTaskResumeAll();
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131 #if( configUSE_MALLOC_FAILED_HOOK == 1 )
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133 if( pvReturn == NULL )
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135 extern void vApplicationMallocFailedHook( void );
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136 vApplicationMallocFailedHook();
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143 /*-----------------------------------------------------------*/
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145 void vPortFree( void *pv )
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147 /* Memory cannot be freed using this scheme. See heap_2.c, heap_3.c and
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148 heap_4.c for alternative implementations, and the memory management pages of
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149 http://www.FreeRTOS.org for more information. */
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152 /* Force an assert as it is invalid to call this function. */
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153 configASSERT( pv == NULL );
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155 /*-----------------------------------------------------------*/
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157 void vPortInitialiseBlocks( void )
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159 /* Only required when static memory is not cleared. */
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160 xNextFreeByte = ( size_t ) 0;
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162 /*-----------------------------------------------------------*/
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164 size_t xPortGetFreeHeapSize( void )
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166 return ( configADJUSTED_HEAP_SIZE - xNextFreeByte );
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