20100923-V6.1.0-RC2/Demo/CORTEX_LM3S811_KEIL/heap/heap_1.c

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+/*
+    FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
+
+    ***************************************************************************
+    *                                                                         *
+    * If you are:                                                             *
+    *                                                                         *
+    *    + New to FreeRTOS,                                                   *
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+    *                                                                         *
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+    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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+    *                                                                         *
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+    * 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            *
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+    ***************************************************************************
+
+    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>
+#include "FreeRTOS.h"
+#include "task.h"
+
+/* Setup the correct byte alignment mask for the defined byte alignment. */
+#if portBYTE_ALIGNMENT == 4
+	#define heapBYTE_ALIGNMENT_MASK	( ( size_t ) 0x0003 )
+#endif
+
+#if portBYTE_ALIGNMENT == 2
+	#define heapBYTE_ALIGNMENT_MASK	( ( size_t ) 0x0001 )
+#endif
+
+#if portBYTE_ALIGNMENT == 1 
+	#define heapBYTE_ALIGNMENT_MASK	( ( size_t ) 0x0000 )
+#endif
+
+#ifndef heapBYTE_ALIGNMENT_MASK
+	#error "Invalid portBYTE_ALIGNMENT definition"
+#endif
+
+/* Allocate the memory for the heap.  The struct is used to force byte
+alignment without using any non-portable code. */
+extern struct xRTOS_HEAP
+{
+	unsigned long ulDummy;
+	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 & heapBYTE_ALIGNMENT_MASK )
+		{
+			/* Byte alignment required. */
+			xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & heapBYTE_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();
+
+	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;
+}
+
+