diff --git a/homework4/.eide/eide.json b/homework4/.eide/eide.json
index 8c6e288..5e01018 100644
--- a/homework4/.eide/eide.json
+++ b/homework4/.eide/eide.json
@@ -18,7 +18,9 @@
   },
   "targets": {
     "Debug": {
-      "excludeList": [],
+      "excludeList": [
+        "src/test1.c"
+      ],
       "toolchain": "Keil_C51",
       "compileConfig": {
         "options": "null"
diff --git a/homework4/src/test2.c b/homework4/src/test2.c
new file mode 100644
index 0000000..71c7f53
--- /dev/null
+++ b/homework4/src/test2.c
@@ -0,0 +1,17 @@
+// test2.c
+// 点亮数码管段b和c，让数码管显示一个数字1
+#include "homework4.h"
+
+void test2()
+{
+    set_38_2SEG();
+    BUS2B = 0; // turn on segment b
+    BUS3C = 0; // turn on segment c
+    while (1) {
+    }
+}
+
+void main()
+{
+    test2();
+}
\ No newline at end of file