TC: more tolerate for tick in TC thread

examples/kernel/semaphore_static.c

@@ -27,9 +27,13 @@ static void thread_entry(void* parameter)
     result = rt_sem_take(&sem, 10);
     if (result == -RT_ETIMEOUT)
     {
-        /* 超时后判断是否刚好是10个OS Tick */
-        if (rt_tick_get() - tick != 10)
+        rt_tick_t new_tick = rt_tick_get();
+        /* 可以有两个 tick 的误差 */
+        if (new_tick - tick >= 12)
         {
+            rt_kprintf("tick error to large: expect: 10, get %d\n",
+                       new_tick - tick);
+
             tc_done(TC_STAT_FAILED);
             rt_sem_detach(&sem);
             return;

examples/kernel/thread_delay.c

@@ -14,7 +14,7 @@ static void thread_entry(void* parameter)
     rt_kprintf("thread delay 10 tick\n");
     tick = rt_tick_get();
     rt_thread_delay(10);
-    if (rt_tick_get() - tick > 10)
+    if (rt_tick_get() - tick > 11)
     {
         tc_done(TC_STAT_FAILED);
         return;
@@ -23,7 +23,7 @@ static void thread_entry(void* parameter)
     rt_kprintf("thread delay 15 tick\n");
     tick = rt_tick_get();
     rt_thread_delay(15);
-    if (rt_tick_get() - tick > 15)
+    if (rt_tick_get() - tick > 16)
     {
         tc_done(TC_STAT_FAILED);
         return;