Heap: add new API to reset xMinimumEverFreeBytesRemaining. (#1189)

This commit adds new API functionality to reset xMinimumEverFreeBytesRemaining.
This functionality provides ability to get heap statistics during a particular period of time.

Signed-off-by: Tomas Galbicka <tomas.galbicka@nxp.com>

include/portable.h

@@ -193,6 +193,7 @@ void vPortFree( void * pv ) PRIVILEGED_FUNCTION;
 void vPortInitialiseBlocks( void ) PRIVILEGED_FUNCTION;
 size_t xPortGetFreeHeapSize( void ) PRIVILEGED_FUNCTION;
 size_t xPortGetMinimumEverFreeHeapSize( void ) PRIVILEGED_FUNCTION;
+void xPortResetHeapMinimumEverFreeHeapSize( void ) PRIVILEGED_FUNCTION;
 
 #if ( configSTACK_ALLOCATION_FROM_SEPARATE_HEAP == 1 )
     void * pvPortMallocStack( size_t xSize ) PRIVILEGED_FUNCTION;

portable/MemMang/heap_4.c

@@ -422,6 +422,12 @@ size_t xPortGetMinimumEverFreeHeapSize( void )
 }
 /*-----------------------------------------------------------*/
 
+void xPortResetHeapMinimumEverFreeHeapSize( void )
+{
+    xMinimumEverFreeBytesRemaining = xFreeBytesRemaining;
+}
+/*-----------------------------------------------------------*/
+
 void vPortInitialiseBlocks( void )
 {
     /* This just exists to keep the linker quiet. */