diff --git a/homework7/.eide/eide.json b/homework7/.eide/eide.json
index 40c5dc6..a8f6f42 100644
--- a/homework7/.eide/eide.json
+++ b/homework7/.eide/eide.json
@@ -18,7 +18,9 @@
   },
   "targets": {
     "Debug": {
-      "excludeList": [],
+      "excludeList": [
+        "src/test1.c"
+      ],
       "toolchain": "Keil_C51",
       "compileConfig": {
         "options": "null"
diff --git a/homework7/homework7.code-workspace b/homework7/homework7.code-workspace
index 8c192af..855e186 100644
--- a/homework7/homework7.code-workspace
+++ b/homework7/homework7.code-workspace
@@ -9,6 +9,7 @@
         "C_Cpp.default.configurationProvider": "cl.eide",
         "C_Cpp.errorSquiggles": "disabled",
         "files.associations": {
+            "*.dbclient-js": "javascript",
             ".eideignore": "ignore",
             "*.a51": "a51",
             "*.h": "c",
@@ -18,7 +19,8 @@
             "*.c++": "cpp",
             "*.cpp": "cpp",
             "*.cxx": "cpp",
-            "*.cc": "cpp"
+            "*.cc": "cpp",
+            "REG52.H": "cpp"
         },
         "[yaml]": {
             "editor.insertSpaces": true,
diff --git a/homework7/src/homework7.h b/homework7/src/homework7.h
index f4a2ebe..b5a75ba 100644
--- a/homework7/src/homework7.h
+++ b/homework7/src/homework7.h
@@ -57,15 +57,21 @@ void switch_138(unsigned char n)
 // 2. void delay_ms(unsigned char ms): a timer by ms base on timer0 mode 1
 void delay_ms(unsigned char ms)
 {
-    unsigned char i;
-    TMOD &= 0xF0;
-    TMOD |= 0x01;
-    for (i = 0; i < ms; i++) {
-        TH0 = 0xFC;
-        TL0 = 0x18;
-        TR0 = 1;
-        while (!TF0);
-        TR0 = 0;
-        TF0 = 0;
+    TMOD &= 0xF0; // set the timer mode to 16-bit timer mode.
+    TMOD |= 0x01; // set the timer mode to 16-bit timer mode.
+
+    // 1ms timer definition:
+    TH0 = 0XFC;
+    TL0 = 0X18;
+
+    // start the timer:
+    TR0 = 1;
+
+    while (ms--) {
+        while (!TF0) {} // wait for the timer to overflow.
+        TF0 = 0;        // clear the timer flag.
+        TH0 = 0XFC;     // reload the timer value.
+        TL0 = 0X18;     // reload the timer value.
     }
+    TR0 = 0; // stop the timer.
 }
\ No newline at end of file
diff --git a/homework7/src/test2.c b/homework7/src/test2.c
new file mode 100644
index 0000000..db713c6
--- /dev/null
+++ b/homework7/src/test2.c
@@ -0,0 +1,36 @@
+/*
+ * @name: test2.c
+ * @author: msksbr
+ * @date: 2025-05-24
+ * @description: a test for homework7's homework tests
+ * @version: 1.0
+ * homework zh_CN: 点阵显示心形图形
+ * homework EN: display a heart shape on the led matrix
+ */
+
+#include "homework7.h"
+
+void test2()
+{
+    unsigned char i; // @var i: a counter for the loop
+    unsigned char code heart[] = {
+        0x00, 0x66, 0xFF, 0xFF,
+        0xFF, 0x7E, 0x3C, 0x18};
+    // @subsection: display a heart shape on the led matrix
+    while (1) // @loop: display the heart shape on the led matrix
+    {
+        for (i = 8; i > 0; i--) // @loop: display the heart shape on the led matrix
+        {
+            switch_138(i);  // switch the 74HC138's address to i
+            P2 = ~heart[i]; // display the heart shape on the led matrix
+            delay_ms(1);
+            P2 = 0xFF; // turn off the led matrix
+        }
+        i = 8;
+    }
+}
+
+void main()
+{
+    test2();
+}
\ No newline at end of file