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+![alt text](3fa6a968257ebd024fe0c76354a5acd.png)
+![alt text](befe15417e42e5cc0554c54b51c2485.jpg)
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@@ -0,0 +1,93 @@
+时间片轮转
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <board.h>
+
+/* defined the LED0 pin: PF9 */
+
+void usr_thread1(void)
+{
+    while(1)
+    {
+        rt_kprintf("run in usr1 thread\n");
+    }
+}
+
+void usr_thread2(void)
+{
+    while(1)
+    {
+        rt_kprintf("run in usr2 thread\n");
+    }
+}
+
+
+static rt_thread_t tid1 = RT_NULL;
+static rt_thread_t tid2 = RT_NULL;
+int main(void)
+{
+    tid1 = rt_thread_create("usr1", usr_thread1, RT_NULL, 1024, 11, 5);
+    tid2 = rt_thread_create("usr2", usr_thread2, RT_NULL, 1024, 11, 5);
+
+    if(tid1 != RT_NULL)
+    {
+        rt_thread_startup(tid1);
+    }
+
+    if(tid2 != RT_NULL)
+    {
+        rt_thread_startup(tid2);
+    }
+
+    rt_kprintf("run in main\n");
+
+    return RT_EOK;
+}
+
+抢占
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <board.h>
+
+/* defined the LED0 pin: PF9 */
+
+void usr_thread1(void)
+{
+    while(1)
+    {
+        rt_kprintf("run in usr1 thread\n");
+        rt_thread_delay(5);
+    }
+}
+
+void usr_thread2(void)
+{
+    while(1)
+    {
+        rt_kprintf("run in usr2 thread\n");
+        rt_thread_delay(5);
+    }
+}
+
+
+static rt_thread_t tid1 = RT_NULL;
+static rt_thread_t tid2 = RT_NULL;
+int main(void)
+{
+    tid1 = rt_thread_create("usr1", usr_thread1, RT_NULL, 1024, 9, 5);
+    tid2 = rt_thread_create("usr2", usr_thread2, RT_NULL, 1024, 9, 5);
+
+    if(tid1 != RT_NULL)
+    {
+        rt_thread_startup(tid1);
+    }
+
+    if(tid2 != RT_NULL)
+    {
+        rt_thread_startup(tid2);
+    }
+
+    rt_kprintf("run in main\n");
+
+    return RT_EOK;
+}
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