diff --git a/homework7/.eide/eide.json b/homework7/.eide/eide.json
index a8f6f42..a828956 100644
--- a/homework7/.eide/eide.json
+++ b/homework7/.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/homework7/src/homework7.h b/homework7/src/homework7.h
index b5a75ba..c93cb65 100644
--- a/homework7/src/homework7.h
+++ b/homework7/src/homework7.h
@@ -3,7 +3,7 @@
  * @author: msksbr
  * @date: 2025-05-24
  * @description: a header for homework7's homework tests
- * @version: 1.0
+ * @version: 1.0f: fix errors in timer
  * variables:
  *   1.0:
  *     1. sbit DB_0 ~ sbit DB_7: pin number for led matrix cathodes
diff --git a/homework7/src/test2.c b/homework7/src/test2.c
index db713c6..10f45e4 100644
--- a/homework7/src/test2.c
+++ b/homework7/src/test2.c
@@ -21,7 +21,7 @@ void test2()
     {
         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
+            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
diff --git a/homework7/src/test3.c b/homework7/src/test3.c
new file mode 100644
index 0000000..4acf33b
--- /dev/null
+++ b/homework7/src/test3.c
@@ -0,0 +1,54 @@
+/*
+ * @name: test1.c
+ * @author: msksbr
+ * @date: 2025-05-24
+ * @description: a test for homework7's homework tests
+ * @version: 1.0
+ * homework zh_CN: 点阵显示一个 I ❤ U 的向下移动动画
+ * homework EN: display a animation of I ❤ U moving down on the led matrix
+ */
+
+#include "homework7.h"
+
+unsigned char code char_i[] = {
+    0x00, 0x3C, 0x18, 0x18,
+    0x18, 0x18, 0x18, 0x3C};
+unsigned char code char_heart[] = {
+    0x00, 0x66, 0xFF, 0xFF,
+    0xFF, 0x7E, 0x3C, 0x18};
+unsigned char code char_u[] = {
+    0x00, 0x66, 0x66, 0x66,
+    0x66, 0x66, 0x7E, 0x3C};
+
+void test3()
+{
+    unsigned char i;        // @var i: a counter for the loop
+    unsigned char char_pos; // @var char_pos: the position of the character to be displayed on the led matrix
+    while (1) {
+        for (char_pos = 0; char_pos < 3; char_pos++) { // @loop: switch the char
+            for (i = 8; i > 0; i--) {                  // @loop: display shape on the led matrix
+                switch_138(i);                         // switch the 74HC138's address to i
+                switch (char_pos) {                    // switch the char to be displayed on the led matrix
+                    case 0:
+                        P2 = ~char_i[i]; // display the char_i on the led matrix
+                        break;
+                    case 1:
+                        P2 = ~char_heart[i]; // display the char_heart on the led matrix
+                        break;
+                    case 2:
+                        P2 = ~char_u[i]; // display the char_u on the led matrix
+                        break;
+                }
+                delay_ms(1); // delay 1ms
+                P2 = 0xFF;   // turn off the led matrix
+            }
+            i = 8; // @subsection reset i to 8
+        }
+        char_pos = 0; // @subsection reset char_pos to 0
+    }
+}
+
+void main()
+{
+    test3();
+}
\ No newline at end of file