增加个全局 delta时间 ，添加BITOPS

include/rtdef.h

@@ -1450,6 +1450,33 @@ typedef struct rt_channel *rt_channel_t;
 /**@}*/
 #endif /* RT_USING_DEVICE */
 
+/* BITOPS */
+
+#if defined (ARCH_CPU_64BIT)
+#define BITS_PER_LONG 64
+#else
+#define BITS_PER_LONG 32
+#endif 
+#define BITS_PER_LONG_LONG 64
+
+#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+
+#define BIT(nr)			(1UL << (nr))
+#define BIT_ULL(nr)		(1ULL << (nr))
+#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
+#define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
+#define BIT_ULL_MASK(nr)	(1ULL << ((nr) % BITS_PER_LONG_LONG))
+#define BIT_ULL_WORD(nr)	((nr) / BITS_PER_LONG_LONG)
+#define BITS_PER_BYTE		8
+#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+
+#define GENMASK(h, l) \
+	(((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
+
+#define GENMASK_ULL(h, l) \
+	(((~0ULL) << (l)) & (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
+
+
 #ifdef __cplusplus
 }
 #endif

include/rtthread.h

@@ -98,6 +98,7 @@ void rt_object_put_sethook(void (*hook)(struct rt_object *object));
  * clock & timer interface
  */
 rt_tick_t rt_tick_get(void);
+rt_tick_t rt_delta_tick_get(rt_tick_t last_time);
 void rt_tick_set(rt_tick_t tick);
 void rt_tick_increase(void);
 void rt_tick_increase_tick(rt_tick_t tick);

src/clock.c

@@ -73,6 +73,24 @@ rt_tick_t rt_tick_get(void)
 }
 RTM_EXPORT(rt_tick_get);
 
+/**
+ * @brief    This function will return delta tick from last_time.
+ *
+ * @param    last_time to consider
+ * 
+ * @return   Return delta tick.
+ */
+ rt_tick_t rt_delta_tick_get(rt_tick_t last_time)
+ {
+     rt_tick_t tnow = rt_tick_get();
+     if (tnow >= last_time) {
+         return (tnow - last_time);
+     } else {
+         return (RT_TICK_MAX - last_time + tnow + 1);
+     }
+ }
+ RTM_EXPORT(rt_delta_tick_get);
+
 /**
  * @brief    This function will set current tick.
  *