diff --git a/homework5/.eide/eide.json b/homework5/.eide/eide.json
index 4d435c9..1db262f 100644
--- a/homework5/.eide/eide.json
+++ b/homework5/.eide/eide.json
@@ -20,9 +20,9 @@
     "Debug": {
       "excludeList": [
         "src/test.c",
-        "src/test2.c",
-        "src/test3.c",
-        "src/test4.c"
+        "src/test1.c",
+        "src/test4.c",
+        "src/test3.c"
       ],
       "toolchain": "Keil_C51",
       "compileConfig": {
diff --git a/homework8/.clang-format b/homework8/.clang-format
new file mode 100644
index 0000000..ecc57c4
--- /dev/null
+++ b/homework8/.clang-format
@@ -0,0 +1,38 @@
+---
+BasedOnStyle: Microsoft
+Language: Cpp
+
+###################################
+#          indent conf
+###################################
+
+UseTab: Never
+IndentWidth: 4
+TabWidth: 4
+ColumnLimit: 0
+AccessModifierOffset: -4
+NamespaceIndentation: All
+FixNamespaceComments: false
+BreakBeforeBraces: Linux
+
+###################################
+#          other styles
+###################################
+
+# 
+# for more conf, you can ref: https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+#
+
+AllowShortIfStatementsOnASingleLine: true
+
+AllowShortLoopsOnASingleLine: true
+
+AllowShortBlocksOnASingleLine: true
+
+IndentCaseLabels: true
+
+SortIncludes: false
+
+AlignConsecutiveMacros: AcrossEmptyLines
+
+AlignConsecutiveAssignments: Consecutive
diff --git a/homework8/.eide/eide.json b/homework8/.eide/eide.json
new file mode 100644
index 0000000..1c8478a
--- /dev/null
+++ b/homework8/.eide/eide.json
@@ -0,0 +1,80 @@
+{
+  "name": "homework8",
+  "type": "C51",
+  "dependenceList": [],
+  "srcDirs": [
+    "src"
+  ],
+  "virtualFolder": {
+    "name": "<virtual_root>",
+    "files": [],
+    "folders": []
+  },
+  "outDir": "build",
+  "deviceName": null,
+  "packDir": null,
+  "miscInfo": {
+    "uid": "4605848772e4bc90af79b39d074376ac"
+  },
+  "targets": {
+    "Debug": {
+      "excludeList": [],
+      "toolchain": "Keil_C51",
+      "compileConfig": {
+        "options": "null"
+      },
+      "uploader": "Custom",
+      "uploadConfig": {
+        "bin": "",
+        "commandLine": "",
+        "eraseChipCommand": ""
+      },
+      "uploadConfigMap": {},
+      "custom_dep": {
+        "name": "default",
+        "incList": [],
+        "libList": [],
+        "defineList": []
+      },
+      "builderOptions": {
+        "SDCC": {
+          "version": 3,
+          "beforeBuildTasks": [],
+          "afterBuildTasks": [],
+          "global": {
+            "device": "mcs51",
+            "optimize-type": "speed",
+            "use-non-free": false
+          },
+          "c/cpp-compiler": {
+            "language-c": "c99"
+          },
+          "asm-compiler": {},
+          "linker": {
+            "$mainFileName": "main",
+            "output-format": "hex"
+          }
+        },
+        "Keil_C51": {
+          "version": 2,
+          "beforeBuildTasks": [],
+          "afterBuildTasks": [],
+          "global": {
+            "ram-mode": "SMALL",
+            "rom-mode": "LARGE"
+          },
+          "c/cpp-compiler": {
+            "optimization-type": "SPEED",
+            "optimization-level": "level-8"
+          },
+          "asm-compiler": {},
+          "linker": {
+            "remove-unused": true,
+            "output-format": "elf"
+          }
+        }
+      }
+    }
+  },
+  "version": "3.5"
+}
\ No newline at end of file
diff --git a/homework8/.eide/files.options.yml b/homework8/.eide/files.options.yml
new file mode 100644
index 0000000..c258721
--- /dev/null
+++ b/homework8/.eide/files.options.yml
@@ -0,0 +1,20 @@
+##########################################################################################
+#                        Append Compiler Options For Source Files
+##########################################################################################
+
+# syntax:
+#   <your pattern>: <compiler options>
+# For get pattern syntax, please refer to: https://www.npmjs.com/package/micromatch
+#
+# examples:
+#   'main.cpp':           --cpp11 -Og ...
+#   'src/*.c':            -gnu -O2 ...
+#   'src/lib/**/*.cpp':   --cpp11 -Os ...
+#   '!Application/*.c':   -O0
+#   '**/*.c':             -O2 -gnu ...
+
+version: "2.0"
+options:
+    Debug:
+        files: {}
+        virtualPathFiles: {}
diff --git a/homework8/.gitignore b/homework8/.gitignore
new file mode 100644
index 0000000..c2f4ce9
--- /dev/null
+++ b/homework8/.gitignore
@@ -0,0 +1,15 @@
+# dot files
+/.vscode/launch.json
+/.settings
+/.eide/log
+/.eide.usr.ctx.json
+
+# project out
+/build
+/bin
+/obj
+/out
+
+# eide template
+*.ept
+*.eide-template
diff --git a/homework8/.vscode/settings.json b/homework8/.vscode/settings.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/homework8/.vscode/settings.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/homework8/.vscode/tasks.json b/homework8/.vscode/tasks.json
new file mode 100644
index 0000000..3e192b9
--- /dev/null
+++ b/homework8/.vscode/tasks.json
@@ -0,0 +1,40 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "type": "shell",
+            "command": "${command:eide.project.build}",
+            "group": "build",
+            "problemMatcher": []
+        },
+        {
+            "label": "flash",
+            "type": "shell",
+            "command": "${command:eide.project.uploadToDevice}",
+            "group": "build",
+            "problemMatcher": []
+        },
+        {
+            "label": "build and flash",
+            "type": "shell",
+            "command": "${command:eide.project.buildAndFlash}",
+            "group": "build",
+            "problemMatcher": []
+        },
+        {
+            "label": "rebuild",
+            "type": "shell",
+            "command": "${command:eide.project.rebuild}",
+            "group": "build",
+            "problemMatcher": []
+        },
+        {
+            "label": "clean",
+            "type": "shell",
+            "command": "${command:eide.project.clean}",
+            "group": "build",
+            "problemMatcher": []
+        }
+    ]
+}
\ No newline at end of file
diff --git a/homework8/homework8.code-workspace b/homework8/homework8.code-workspace
new file mode 100644
index 0000000..8c192af
--- /dev/null
+++ b/homework8/homework8.code-workspace
@@ -0,0 +1,44 @@
+{
+    "folders": [
+        {
+            "path": "."
+        }
+    ],
+    "settings": {
+        "files.autoGuessEncoding": true,
+        "C_Cpp.default.configurationProvider": "cl.eide",
+        "C_Cpp.errorSquiggles": "disabled",
+        "files.associations": {
+            ".eideignore": "ignore",
+            "*.a51": "a51",
+            "*.h": "c",
+            "*.c": "c",
+            "*.hxx": "cpp",
+            "*.hpp": "cpp",
+            "*.c++": "cpp",
+            "*.cpp": "cpp",
+            "*.cxx": "cpp",
+            "*.cc": "cpp"
+        },
+        "[yaml]": {
+            "editor.insertSpaces": true,
+            "editor.tabSize": 4,
+            "editor.autoIndent": "advanced"
+        }
+    },
+    "extensions": {
+        "recommendations": [
+            "cl.eide",
+            "keroc.hex-fmt",
+            "xiaoyongdong.srecord",
+            "hars.cppsnippets",
+            "zixuanwang.linkerscript",
+            "redhat.vscode-yaml",
+            "IBM.output-colorizer",
+            "cschlosser.doxdocgen",
+            "ms-vscode.vscode-serial-monitor",
+            "alefragnani.project-manager",
+            "cl.stm8-debug"
+        ]
+    }
+}
\ No newline at end of file