diff --git a/homework7/homework7.pdsprj b/homework7/homework7.pdsprj
index b444d4a..05896c6 100644
Binary files a/homework7/homework7.pdsprj and b/homework7/homework7.pdsprj differ
diff --git a/homework7/src/homework7.h b/homework7/src/homework7.h
new file mode 100644
index 0000000..25d2720
--- /dev/null
+++ b/homework7/src/homework7.h
@@ -0,0 +1,47 @@
+/*
+ * name: homework7.h
+ * author: msksbr
+ * date: 2025-5-20
+ * purpose:
+ *   variable:
+ *       1. pins number for 8x8 LED matrix
+ *   function:
+ *       1. initialize the 8x8 LED matrix x template
+ */
+
+#include <REG52.H>
+
+// variable:
+// 1. pins number for 8x8 LED matrix:
+// Y template:
+sbit LED_Y0 = P2 ^ 0;
+sbit LED_Y1 = P2 ^ 1;
+sbit LED_Y2 = P2 ^ 2;
+sbit LED_Y3 = P2 ^ 3;
+sbit LED_Y4 = P2 ^ 4;
+sbit LED_Y5 = P2 ^ 5;
+sbit LED_Y6 = P2 ^ 6;
+sbit LED_Y7 = P2 ^ 7;
+// X template:
+sbit LED_X0 = P3 ^ 0;
+sbit LED_X1 = P3 ^ 1;
+sbit LED_X2 = P3 ^ 2;
+sbit LED_X3 = P3 ^ 3;
+sbit LED_X4 = P3 ^ 4;
+sbit LED_X5 = P3 ^ 5;
+sbit LED_X6 = P3 ^ 6;
+sbit LED_X7 = P3 ^ 7;
+
+// function:
+// 1. initialize the 8x8 LED matrix x template:
+void init_x_template()
+{
+    LED_X0 = 0;
+    LED_X1 = 0;
+    LED_X2 = 0;
+    LED_X3 = 0;
+    LED_X4 = 0;
+    LED_X5 = 0;
+    LED_X6 = 0;
+    LED_X7 = 0;
+}
\ No newline at end of file
diff --git a/homework7/src/test1.c b/homework7/src/test1.c
new file mode 100644
index 0000000..ce0f5ac
--- /dev/null
+++ b/homework7/src/test1.c
@@ -0,0 +1,22 @@
+/*
+ * name: test1.c
+ * author: msksbr
+ * date: 2025-5-20
+ * description: a test program for a homework
+ * homework zh_CN: 点亮点阵左上角的那个LED小灯
+ * homework en_US: light up the LED in the top left corner of the LED matrix
+ */
+
+#include "homework7.h"
+
+void test1()
+{
+    init_x_template();
+    LED_X0 = 1;
+    LED_Y7 = 0;
+}
+
+void main()
+{
+    test1();
+}
\ No newline at end of file