possibility to define ENABLE_CALLOC_REALLOC as compiler flags

src/FreeRTOSConfig.h

@@ -46,7 +46,7 @@
 
 
 #define configUSE_PREEMPTION			1
-#define configUSE_IDLE_HOOK				1
+#define configUSE_IDLE_HOOK				1 // 0 = loop() is a dedicated task | 1 = loop() is the FreeRTOS idle hook function TODO
 #define configUSE_TICK_HOOK				0
 #define configCPU_CLOCK_HZ				( ( unsigned long ) F_CPU  )
 #define configTICK_RATE_HZ				( ( TickType_t ) 1000 )
@@ -159,6 +159,9 @@ to all Cortex-M ports, and do not rely on any particular library functions. */
 See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
 #define configMAX_SYSCALL_INTERRUPT_PRIORITY 	( configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS) )
 
+/* Run Arduino Loop function as dedicated stack */
+extern void runLoopAsTask(uint16_t stack, uint16_t priority);
+
 /* Definitions that map the FreeRTOS port interrupt handlers to their CMSIS
 standard names. */
 #define vPortSVCHandler SVC_Handler

src/heap_4bis.c

@@ -435,7 +435,9 @@ uint8_t *puc;
 }
 
 // non standard contributed feature that can be enabled
+#ifndef ENABLE_CALLOC_REALLOC
 #define ENABLE_CALLOC_REALLOC 0
+#endif
 
 #if ENABLE_CALLOC_REALLOC
 

src/idle_hook.c

@@ -1,12 +1,33 @@
 
 #include <FreeRTOS.h>
 #include <Arduino.h>
+//Arduino loop as task
+#include "task.h"
 
+uint8_t loopAsTask = 0;
+TaskHandle_t loopHandle;
 
 // this is referring to the loop function of your arduino project
 extern void loop(void); 
 
 void  __attribute__((weak)) vApplicationIdleHook( void ) 
 {
-  loop(); //will use your projects loop function as the rtos idle loop
+    if (!loopAsTask)
+    {
+        loop(); //will use your projects loop function as the rtos idle loop
+    }
+}
+
+void loopTask(void *pvParameters)
+{
+    while(1)
+    {
+        loop();
+    }
+}
+
+void runLoopAsTask(uint16_t stack, uint16_t priority)
+{
+    loopAsTask = 1;
+    xTaskCreate(loopTask, "loop", stack, ( void * ) NULL, ( (UBaseType_t)priority | portPRIVILEGE_BIT ) , &loopHandle);
 }