/* | |
FreeRTOS V6.0.0 - Copyright (C) 2009 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 eBook * | |
* * | |
* "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 <stdlib.h> | |
/* 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 ); | |
} | |