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/*

    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 <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 );

}