diff options
Diffstat (limited to 'FreeRTOS/Source/portable/MemMang/heap_1.c')
| -rw-r--r-- | FreeRTOS/Source/portable/MemMang/heap_1.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/FreeRTOS/Source/portable/MemMang/heap_1.c b/FreeRTOS/Source/portable/MemMang/heap_1.c new file mode 100644 index 0000000..70a6bb1 --- /dev/null +++ b/FreeRTOS/Source/portable/MemMang/heap_1.c @@ -0,0 +1,152 @@ +/*
+ 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 );
+}
+
+
+
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