Improved time range check in the kernel.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@6401 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 26 insertions, 1 deletions

diff --git a/os/kernel/include/chvt.h b/os/kernel/include/chvt.h
index c677689af..c1b246cd3 100644
--- a/os/kernel/include/chvt.h
+++ b/os/kernel/include/chvt.h
@@ -207,6 +207,32 @@ typedef struct {
  * @api

  */

 #define chTimeNow() (vtlist.vt_systime)

+

+/**

+ * @brief   Returns the elapsed time since the specified start time.

+ *

+ * @param[in] start     start time

+ * @return              The elapsed time.

+ *

+ * @api

+ */

+#define chTimeElapsedSince(start) (chTimeNow() - (start))

+

+/**

+ * @brief   Checks if the current system time is within the specified time

+ *          window.

+ * @note    When start==end then the function returns always true because the

+ *          whole time range is specified.

+ *

+ * @param[in] start     the start of the time window (inclusive)

+ * @param[in] end       the end of the time window (non inclusive)

+ * @retval TRUE         current time within the specified time window.

+ * @retval FALSE        current time not within the specified time window.

+ *

+ * @api

+ */

+#define chTimeIsWithin(start, end)                                          \

+  (chTimeElapsedSince(start) < ((end) - (start)))

 /** @} */

 

 extern VTList vtlist;

@@ -220,7 +246,6 @@ extern "C" {
   void _vt_init(void);

   void chVTSetI(VirtualTimer *vtp, systime_t time, vtfunc_t vtfunc, void *par);

   void chVTResetI(VirtualTimer *vtp);

-  bool_t chTimeIsWithin(systime_t start, systime_t end);

 #ifdef __cplusplus

 }

 #endif