diff --git a/homework4/.eide/eide.json b/homework4/.eide/eide.json
index 5e01018..a73c9ae 100644
--- a/homework4/.eide/eide.json
+++ b/homework4/.eide/eide.json
@@ -19,7 +19,8 @@
   "targets": {
     "Debug": {
       "excludeList": [
-        "src/test1.c"
+        "src/test1.c",
+        "src/test2.c"
       ],
       "toolchain": "Keil_C51",
       "compileConfig": {
diff --git a/homework4/src/test3.c b/homework4/src/test3.c
new file mode 100644
index 0000000..942e525
--- /dev/null
+++ b/homework4/src/test3.c
@@ -0,0 +1,14 @@
+// test3.c
+// 用一个数码管的静态显示来实现一个简单的秒表
+
+#include "homework4.h"
+
+void test3()
+{
+    set_38_2SEG();
+}
+
+void main()
+{
+    test3();
+}
\ No newline at end of file