diff --git a/.vscode/settings.json b/.vscode/settings.json
index 4a2de2e..3a44ddb 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -4,6 +4,7 @@
         "stdio.h": "c",
         "windows.h": "c",
         "cmath": "c",
-        "list.h": "c"
+        "list.h": "c",
+        "stdlib.h": "c"
     }
 }
\ No newline at end of file
diff --git a/build/port_windows.o b/build/port_windows.o
index 67a59e1..645d6a4 100644
Binary files a/build/port_windows.o and b/build/port_windows.o differ
diff --git a/list_easy_timer.exe b/list_easy_timer.exe
index 5b012f5..3ef5aa4 100644
Binary files a/list_easy_timer.exe and b/list_easy_timer.exe differ
diff --git a/port_windows.c b/port_windows.c
index f0f4d53..2cadd23 100644
--- a/port_windows.c
+++ b/port_windows.c
@@ -22,6 +22,11 @@ void hello_dog(){
     printf("hello dog\n");
 }
 EXPORT_EASY_TIMER_HANDLE(hello_dog,TIMER_CONTINUE_TRIGGER, MS_TO_TICK(1000));
+
+void hello_once(){
+    printf("hello once\n");
+}
+EXPORT_EASY_TIMER_HANDLE(hello_once,TIMER_SIGNAL_TRIGGER, MS_TO_TICK(1000));
 /**
  * @brief 获取当前时间
  * @return 时间