git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/kernel_3_dev@6468 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/nil/include/nil.h

@@ -719,6 +719,17 @@ typedef struct {
 #define chVTGetSystemTimeX() port_timer_get_time()
 #endif
 
+/**
+ * @brief   Returns the elapsed time since the specified start time.
+ *
+ * @param[in] start     start time
+ * @return              The elapsed time.
+ *
+ * @xclass
+ */
+#define chVTTimeElapsedSinceX(start)                                        \
+  ((systime_t)(chVTGetSystemTimeX() - start))
+
 /**
  * @brief   Checks if the specified time is within the specified time window.
  * @note    When start==end then the function returns always true because the