Add SIF files.

Source/SIF.c

@@ -0,0 +1,9 @@
+#include "SIF.h"
+#include "common.h"
+
+
+
+void SIF(void *p)
+{
+    (void)p;
+}

Source/SIF.h

@@ -0,0 +1,14 @@
+#ifndef SIF_H
+#define SIF_H
+
+/* Scheduler include files. */
+#include "FreeRTOS.h"
+#include "task.h"
+#include "semphr.h"
+
+#include <stdio.h>
+
+
+extern void SIF(void *p);
+
+#endif