Use thread-safe memory manager using C runtime (Newlib)

By default, the heap_useNewlib.c will be used.
As suggested by @ppescher, use -1 as the number of heap implementations
might grow in future versions.

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

src/FreeRTOSConfig_Default.h

@@ -84,7 +84,11 @@
  *----------------------------------------------------------*/
 
 /* Begin custom definitions for STM32 */
-/* Default (3) Memory allocation implementations (heap_[1-5].c) */
+/* Define memory allocation implementations to use:
+ * 1 to 5 for heap_[1-5].c
+ * -1 for heap_useNewlib.c
+ * Default -1 see heap.c
+ */
 /*#define configMEMMANG_HEAP_NB             3*/
 /* End custom definitions for STM32 */
 

src/heap.c

@@ -2,6 +2,7 @@
  * @file    heap.c
  * @author  Frederic Pillon <[email protected]> for STMicroelectronics.
  * @brief   Provide Memory allocation implementations included in the FreeRTOS source
+ * heap_useNewlib - thread-safe memory manager using C runtime (Newlib)
  * heap_1 - the very simplest, does not permit memory to be freed
  * heap_2 - permits memory to be freed, but not does coalescence adjacent free blocks.
  * heap_3 - simply wraps the standard malloc() and free() for thread safety
@@ -11,10 +12,12 @@
 #include "FreeRTOS.h"
 
 #ifndef configMEMMANG_HEAP_NB
-#define configMEMMANG_HEAP_NB      3
+#define configMEMMANG_HEAP_NB      -1
 #endif
 
-#if (configMEMMANG_HEAP_NB == 1)
+#if (configMEMMANG_HEAP_NB == -1)
+#include "../portable/MemMang/heap_useNewlib.c"
+#elif (configMEMMANG_HEAP_NB == 1)
 #include "../portable/MemMang/heap_1.c"
 #elif (configMEMMANG_HEAP_NB == 2)
 #include "../portable/MemMang/heap_2.c"