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- #include <stdlib.h>
- #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
- #include "FreeRTOS.h"
- #include "task.h"
- #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
- #define configADJUSTED_HEAP_SIZE ( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
- static void prvHeapInit( void );
- static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
- typedef struct A_BLOCK_LINK
- {
- struct A_BLOCK_LINK *pxNextFreeBlock;
- size_t xBlockSize;
- } BlockLink_t;
- static const uint16_t heapSTRUCT_SIZE = ( ( sizeof ( BlockLink_t ) + ( portBYTE_ALIGNMENT - 1 ) ) & ~portBYTE_ALIGNMENT_MASK );
- #define heapMINIMUM_BLOCK_SIZE ( ( size_t ) ( heapSTRUCT_SIZE * 2 ) )
- static BlockLink_t xStart, xEnd;
- static size_t xFreeBytesRemaining = configADJUSTED_HEAP_SIZE;
- #define prvInsertBlockIntoFreeList( pxBlockToInsert ) \
- { \
- BlockLink_t *pxIterator; \
- size_t xBlockSize; \
- \
- xBlockSize = pxBlockToInsert->xBlockSize; \
- \
- \
- \
- for( pxIterator = &xStart; pxIterator->pxNextFreeBlock->xBlockSize < xBlockSize; pxIterator = pxIterator->pxNextFreeBlock ) \
- { \
- \
- } \
- \
- \
- \
- pxBlockToInsert->pxNextFreeBlock = pxIterator->pxNextFreeBlock; \
- pxIterator->pxNextFreeBlock = pxBlockToInsert; \
- }
- void *pvPortMalloc( size_t xWantedSize )
- {
- BlockLink_t *pxBlock, *pxPreviousBlock, *pxNewBlockLink;
- static BaseType_t xHeapHasBeenInitialised = pdFALSE;
- void *pvReturn = NULL;
- vTaskSuspendAll();
- {
-
- if( xHeapHasBeenInitialised == pdFALSE )
- {
- prvHeapInit();
- xHeapHasBeenInitialised = pdTRUE;
- }
-
- if( xWantedSize > 0 )
- {
- xWantedSize += heapSTRUCT_SIZE;
-
- if( ( xWantedSize & portBYTE_ALIGNMENT_MASK ) != 0 )
- {
-
- xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
- }
- }
- if( ( xWantedSize > 0 ) && ( xWantedSize < configADJUSTED_HEAP_SIZE ) )
- {
-
- pxPreviousBlock = &xStart;
- pxBlock = xStart.pxNextFreeBlock;
- while( ( pxBlock->xBlockSize < xWantedSize ) && ( pxBlock->pxNextFreeBlock != NULL ) )
- {
- pxPreviousBlock = pxBlock;
- pxBlock = pxBlock->pxNextFreeBlock;
- }
-
- if( pxBlock != &xEnd )
- {
-
- pvReturn = ( void * ) ( ( ( uint8_t * ) pxPreviousBlock->pxNextFreeBlock ) + heapSTRUCT_SIZE );
-
- pxPreviousBlock->pxNextFreeBlock = pxBlock->pxNextFreeBlock;
-
- if( ( pxBlock->xBlockSize - xWantedSize ) > heapMINIMUM_BLOCK_SIZE )
- {
-
- pxNewBlockLink = ( void * ) ( ( ( uint8_t * ) pxBlock ) + xWantedSize );
-
- pxNewBlockLink->xBlockSize = pxBlock->xBlockSize - xWantedSize;
- pxBlock->xBlockSize = xWantedSize;
-
- prvInsertBlockIntoFreeList( ( pxNewBlockLink ) );
- }
- xFreeBytesRemaining -= pxBlock->xBlockSize;
- }
- }
- traceMALLOC( pvReturn, xWantedSize );
- }
- ( void ) xTaskResumeAll();
- #if( configUSE_MALLOC_FAILED_HOOK == 1 )
- {
- if( pvReturn == NULL )
- {
- extern void vApplicationMallocFailedHook( void );
- vApplicationMallocFailedHook();
- }
- }
- #endif
- return pvReturn;
- }
- void vPortFree( void *pv )
- {
- uint8_t *puc = ( uint8_t * ) pv;
- BlockLink_t *pxLink;
- if( pv != NULL )
- {
-
- puc -= heapSTRUCT_SIZE;
-
- pxLink = ( void * ) puc;
- vTaskSuspendAll();
- {
-
- prvInsertBlockIntoFreeList( ( ( BlockLink_t * ) pxLink ) );
- xFreeBytesRemaining += pxLink->xBlockSize;
- traceFREE( pv, pxLink->xBlockSize );
- }
- ( void ) xTaskResumeAll();
- }
- }
- size_t xPortGetFreeHeapSize( void )
- {
- return xFreeBytesRemaining;
- }
- void vPortInitialiseBlocks( void )
- {
-
- }
- static void prvHeapInit( void )
- {
- BlockLink_t *pxFirstFreeBlock;
- uint8_t *pucAlignedHeap;
-
- pucAlignedHeap = ( uint8_t * ) ( ( ( portPOINTER_SIZE_TYPE ) &ucHeap[ portBYTE_ALIGNMENT ] ) & ( ( portPOINTER_SIZE_TYPE ) ~portBYTE_ALIGNMENT_MASK ) );
-
- xStart.pxNextFreeBlock = ( void * ) pucAlignedHeap;
- xStart.xBlockSize = ( size_t ) 0;
-
- xEnd.xBlockSize = configADJUSTED_HEAP_SIZE;
- xEnd.pxNextFreeBlock = NULL;
-
- pxFirstFreeBlock = ( void * ) pucAlignedHeap;
- pxFirstFreeBlock->xBlockSize = configADJUSTED_HEAP_SIZE;
- pxFirstFreeBlock->pxNextFreeBlock = &xEnd;
- }
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