xtimer: support a negative XTIMER_SHIFT.

8 years ago · 3c275370c3
parent f86c118594
commit 3c275370c3
1 changed files with 5 additions and 0 deletions
--- a/sys/include/xtimer.h
+++ b/sys/include/xtimer.h
@ -342,8 +342,13 @@ int xtimer_msg_receive_timeout64(msg_t *msg, uint64_t us);
 #define XTIMER_SHIFT (0)
 #endif

+#if (XTIMER_SHIFT < 0)
+#define XTIMER_RSHIFT(value) ( (value) << -XTIMER_SHIFT )
+#define XTIMER_LSHIFT(value) ( (value) >> -XTIMER_SHIFT )
+#else
 #define XTIMER_RSHIFT(value) ( (value) >> XTIMER_SHIFT )
 #define XTIMER_LSHIFT(value) ( (value) << XTIMER_SHIFT )
+#endif

 /**
 * @brief set xtimer default timer configuration