Add xPortGetFreeHeapSize() function.

Source/include/mpu_wrappers.h

@@ -99,6 +99,8 @@ only for ports that are using the MPU. */
 
 		#define pvPortMalloc					MPU_pvPortMalloc
 		#define vPortFree						MPU_vPortFree
+		#define xPortGetFreeHeapSize			MPU_xPortGetFreeHeapSize
+		#define vPortInitialiseBlocks			MPU_vPortInitialiseBlocks
 
 		/* Remove the privileged function macro. */
 		#define PRIVILEGED_FUNCTION

Source/include/portable.h

@@ -350,6 +350,7 @@ extern "C" {
 void *pvPortMalloc( size_t xSize ) PRIVILEGED_FUNCTION;
 void vPortFree( void *pv ) PRIVILEGED_FUNCTION;
 void vPortInitialiseBlocks( void ) PRIVILEGED_FUNCTION;
+size_t xPortGetFreeHeapSize( void ) PRIVILEGED_FUNCTION;
 
 /*
  * Setup the hardware ready for the scheduler to take control.  This generally

Source/portable/GCC/ARM_CM3_MPU/port.c

@@ -1025,3 +1025,27 @@ portBASE_TYPE xRunningPrivileged = prvRaisePrivilege();
 
 	portRESET_PRIVILEGE( xRunningPrivileged );
 }
+/*-----------------------------------------------------------*/
+
+void MPU_vPortInitialiseBlocks( void )
+{
+portBASE_TYPE xRunningPrivileged = prvRaisePrivilege();
+
+	vPortInitialiseBlocks();
+
+	portRESET_PRIVILEGE( xRunningPrivileged );
+}
+/*-----------------------------------------------------------*/
+
+size_t MPU_xPortGetFreeHeapSize( void )
+{
+size_t xReturn;
+portBASE_TYPE xRunningPrivileged = prvRaisePrivilege();
+
+	xReturn = xPortGetFreeHeapSize();
+
+	portRESET_PRIVILEGE( xRunningPrivileged );
+	
+	return xReturn;
+}
+

Source/portable/MemMang/heap_1.c

@@ -136,5 +136,12 @@ void vPortInitialiseBlocks( void )
 	/* Only required when static memory is not cleared. */
 	xNextFreeByte = ( size_t ) 0;
 }
+/*-----------------------------------------------------------*/
+
+size_t xPortGetFreeHeapSize( void )
+{
+	return ( configTOTAL_HEAP_SIZE - xNextFreeByte );
+}
+
 
 

Source/portable/MemMang/heap_2.c

@@ -93,6 +93,10 @@ static const unsigned short  heapSTRUCT_SIZE	= ( sizeof( xBlockLink ) + portBYTE
 /* Create a couple of list links to mark the start and end of the list. */
 static xBlockLink xStart, xEnd;
 
+/* Keeps track of the number of free bytes remaining, but says nothing about
+fragmentation. */
+static size_t xFreeBytesRemaining = configTOTAL_HEAP_SIZE;
+
 /* STATIC FUNCTIONS ARE DEFINED AS MACROS TO MINIMIZE THE FUNCTION CALL DEPTH. */
 
 /*
@@ -211,6 +215,8 @@ void *pvReturn = NULL;
 					/* Insert the new block into the list of free blocks. */
 					prvInsertBlockIntoFreeList( ( pxNewBlockLink ) );
 				}
+				
+				xFreeBytesRemaining -= xWantedSize;
 			}
 		}
 	}
@@ -248,9 +254,16 @@ xBlockLink *pxLink;
 		{
 			/* Add this block to the list of free blocks. */
 			prvInsertBlockIntoFreeList( ( ( xBlockLink * ) pxLink ) );
+			xFreeBytesRemaining += pxLink->xBlockSize;
 		}
 		xTaskResumeAll();
 	}
 }
 /*-----------------------------------------------------------*/
 
+size_t xPortGetFreeHeapSize( void )
+{
+	return xFreeBytesRemaining;
+}
+/*-----------------------------------------------------------*/
+