diff --git a/homework7/.eide/eide.json b/homework7/.eide/eide.json
index a828956..d853fa5 100644
--- a/homework7/.eide/eide.json
+++ b/homework7/.eide/eide.json
@@ -20,7 +20,8 @@
     "Debug": {
       "excludeList": [
         "src/test1.c",
-        "src/test2.c"
+        "src/test2.c",
+        "src/test3.c"
       ],
       "toolchain": "Keil_C51",
       "compileConfig": {
diff --git a/homework7/src/test3.c b/homework7/src/test3.c
index f9567d5..31bbe10 100644
--- a/homework7/src/test3.c
+++ b/homework7/src/test3.c
@@ -11,11 +11,10 @@
 #include "homework7.h"
 
 unsigned char code display[] = {
-    // it is fucking reverse
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // space
-    0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x7E, 0x3C, // U
-    0x00, 0x66, 0xFF, 0xFF, 0xFF, 0x7E, 0x3C, 0x18, // ❤
     0x00, 0x3C, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, // I
+    0x00, 0x66, 0xFF, 0xFF, 0xFF, 0x7E, 0x3C, 0x18, // ❤
+    0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x7E, 0x3C, // U
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // space
 };
 
diff --git a/homework7/src/test4.c b/homework7/src/test4.c
new file mode 100644
index 0000000..dd9a41c
--- /dev/null
+++ b/homework7/src/test4.c
@@ -0,0 +1,87 @@
+/*
+ * @name: test4.c
+ * @author: msksbr
+ * @date: 2025-05-25
+ * @description: a test for homework7's homework tests
+ * @version: 1.0
+ * homework zh_CN: 点阵显示一个 I ❤ U 的向右移动动画
+ * homework EN: display a I ❤ U moving right animation on the led matrix
+ */
+
+#include "homework7.h"
+
+unsigned char code frames[30][8] = {
+    {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
+    {0xFF, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F},
+    {0xFF, 0x3F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x3F},
+    {0xFF, 0x1F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x1F},
+    {0xFF, 0x0F, 0x9F, 0x9F, 0x9F, 0x9F, 0x9F, 0x0F},
+    {0xFF, 0x87, 0xCF, 0xCF, 0xCF, 0xCF, 0xCF, 0x87},
+    {0xFF, 0xC3, 0xE7, 0xE7, 0xE7, 0xE7, 0xE7, 0xC3},
+    {0xFF, 0xE1, 0x73, 0x73, 0x73, 0xF3, 0xF3, 0xE1},
+    {0xFF, 0x70, 0x39, 0x39, 0x39, 0x79, 0xF9, 0xF0},
+    {0xFF, 0x38, 0x1C, 0x1C, 0x1C, 0x3C, 0x7C, 0xF8},
+    {0xFF, 0x9C, 0x0E, 0x0E, 0x0E, 0x1E, 0x3E, 0x7C},
+    {0xFF, 0xCE, 0x07, 0x07, 0x07, 0x0F, 0x1F, 0x3E},
+    {0xFF, 0x67, 0x03, 0x03, 0x03, 0x07, 0x0F, 0x9F},
+    {0xFF, 0x33, 0x01, 0x01, 0x01, 0x03, 0x87, 0xCF},
+    {0xFF, 0x99, 0x00, 0x00, 0x00, 0x81, 0xC3, 0xE7},
+    {0xFF, 0xCC, 0x80, 0x80, 0x80, 0xC0, 0xE1, 0xF3},
+    {0xFF, 0xE6, 0xC0, 0xC0, 0xC0, 0xE0, 0xF0, 0xF9},
+    {0xFF, 0x73, 0x60, 0x60, 0x60, 0x70, 0x78, 0xFC},
+    {0xFF, 0x39, 0x30, 0x30, 0x30, 0x38, 0x3C, 0x7E},
+    {0xFF, 0x9C, 0x98, 0x98, 0x98, 0x9C, 0x1E, 0x3F},
+    {0xFF, 0xCE, 0xCC, 0xCC, 0xCC, 0xCE, 0x0F, 0x1F},
+    {0xFF, 0x67, 0x66, 0x66, 0x66, 0x67, 0x07, 0x0F},
+    {0xFF, 0x33, 0x33, 0x33, 0x33, 0x33, 0x03, 0x87},
+    {0xFF, 0x99, 0x99, 0x99, 0x99, 0x99, 0x81, 0xC3},
+    {0xFF, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xC0, 0xE1},
+    {0xFF, 0xE6, 0xE6, 0xE6, 0xE6, 0xE6, 0xE0, 0xF0},
+    {0xFF, 0xF3, 0xF3, 0xF3, 0xF3, 0xF3, 0xF0, 0xF8},
+    {0xFF, 0xF9, 0xF9, 0xF9, 0xF9, 0xF9, 0xF8, 0xFC},
+    {0xFF, 0xFC, 0xFC, 0xFC, 0xFC, 0xFC, 0xFC, 0xFE},
+    {0xFF, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF}};
+
+void test4()
+{
+    EA    = 1;
+    ENLED = 0;
+    ADDR3 = 0;
+    TMOD  = 0x01;
+    TH0   = 0xFC;
+    TL0   = 0x67;
+    ET0   = 1;
+    TR0   = 1;
+    while (1);
+}
+
+void InterruptTimer0() interrupt 1
+{
+    static unsigned char i     = 0;
+    static unsigned char tmr   = 0;
+    static unsigned char index = 29;
+
+    TH0 = 0xFC;
+    TL0 = 0x67;
+    P2  = 0xFF;
+    switch_138(i);
+    i++;
+    if (i >= 8) {
+        i = 0;
+    }
+    P2 = frames[index][i];
+    tmr++;
+    if (tmr >= 250) {
+        tmr = 0;
+        if (index == 0) {
+            index = 30;
+        } else {
+            index--;
+        }
+    }
+}
+
+void main()
+{
+    test4();
+}
\ No newline at end of file