diff --git a/homework4/.eide/eide.json b/homework4/.eide/eide.json
index 27a88af..5e01018 100644
--- a/homework4/.eide/eide.json
+++ b/homework4/.eide/eide.json
@@ -19,7 +19,7 @@
   "targets": {
     "Debug": {
       "excludeList": [
-        "src/test2.c"
+        "src/test1.c"
       ],
       "toolchain": "Keil_C51",
       "compileConfig": {
diff --git a/homework4/homework4.code-workspace b/homework4/homework4.code-workspace
index 8c192af..76b8831 100644
--- a/homework4/homework4.code-workspace
+++ b/homework4/homework4.code-workspace
@@ -24,7 +24,15 @@
             "editor.insertSpaces": true,
             "editor.tabSize": 4,
             "editor.autoIndent": "advanced"
-        }
+        },
+        "cSpell.words": [
+            "ENSEG",
+            "SEGB",
+            "SEGC",
+            "SEGD",
+            "SEGE",
+            "SEGF"
+        ]
     },
     "extensions": {
         "recommendations": [
diff --git a/homework4/homework4.pdsprj b/homework4/homework4.pdsprj
deleted file mode 100644
index ca058b3..0000000
Binary files a/homework4/homework4.pdsprj and /dev/null differ
diff --git a/homework4/src/homework4.h b/homework4/src/homework4.h
deleted file mode 100644
index caa7d2b..0000000
--- a/homework4/src/homework4.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// homework4.h
-
-/*
- * this file defines the pin numbers for the LED and 38 transistors.
- */
-
-#include <REG52.H>
-
-sbit D_ADDR0 = P1 ^ 0;
-sbit D_ADDR1 = P1 ^ 1;
-sbit D_ADDR2 = P1 ^ 2;
-sbit D_ADDR3 = P1 ^ 3;
-sbit ENLED   = P1 ^ 4;
-
-sbit D1 = P2 ^ 0;
-sbit D2 = P2 ^ 1;
-sbit D3 = P2 ^ 2;
-sbit D4 = P2 ^ 3;
-sbit D5 = P2 ^ 4;
-sbit D6 = P2 ^ 5;
-sbit D7 = P2 ^ 6;
-sbit D8 = P2 ^ 7;
\ No newline at end of file
diff --git a/homework4/src/test1.c b/homework4/src/test1.c
deleted file mode 100644
index 8e67f71..0000000
--- a/homework4/src/test1.c
+++ /dev/null
@@ -1,33 +0,0 @@
-// test1.c
-// 通过定时器实现以0.5Hz的频率闪烁一个小灯
-
-#include "homework4.h"
-
-unsigned char cnt = 0; // log timer T0 overflow counts
-
-void main()
-{
-    ENLED = 0;
-    D_ADDR3 = 1;
-    D_ADDR2 = 1;
-    D_ADDR1 = 1;
-    D_ADDR0 = 0;
-
-    TMOD = 0x01; // timer T0 mode 1, 16-bit timer
-    TH0  = 0XB8;
-    TL0  = 0X00;
-    TR0  = 1; // timer T0 run
-
-    while (1) {
-        if (TF0 == 1) { // timer T0 overflow
-            TF0 = 0;    // clear timer T0 overflow flag
-            TH0 = 0xB8; // reload timer T0 value
-            TL0 = 0x00;
-            cnt++; // log timer T0 overflow counts
-            if (cnt >= 50) {
-                cnt = 0;    // clear log timer T0 overflow counts
-                D1 = ~D1; // toggle LED
-            }
-        }
-    }
-}
\ No newline at end of file
diff --git a/homework4/src/test2.c b/homework4/src/test2.c
deleted file mode 100644
index 80f088f..0000000
--- a/homework4/src/test2.c
+++ /dev/null
@@ -1,8 +0,0 @@
-// 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 main() {
-
-}
\ No newline at end of file