diff --git a/my_pro/myinfrared.c b/my_pro/myinfrared.c
index 848f09a..903bfd9 100644
--- a/my_pro/myinfrared.c
+++ b/my_pro/myinfrared.c
@@ -34,7 +34,8 @@ void snake_compare(rt_uint8_t key, rt_uint8_t repeat)
         if (rt_atomic_load(&now_direction) != 2)
             rt_atomic_store(&now_direction, 0);
             
-            rt_strncpy(str,"forward\n",10);
+            const char *str ="forward\n";
+            // rt_strncpy(str,"forward\n",10);
         // *str = ;
         rt_device_write(serial, 0, str, rt_strlen(str));
 
@@ -46,7 +47,8 @@ void snake_compare(rt_uint8_t key, rt_uint8_t repeat)
         if (rt_atomic_load(&now_direction) != 3)
             rt_atomic_store(&now_direction, 1);
         // *str = "left\n";
-        rt_strncpy(str,"left\n",10);
+        const char *str = "left\n";
+        // rt_strncpy(str,"left\n",10);
         rt_device_write(serial, 0, str, rt_strlen(str));
     }
         
@@ -55,8 +57,8 @@ void snake_compare(rt_uint8_t key, rt_uint8_t repeat)
     {
         if (rt_atomic_load(&now_direction) != 0)
             rt_atomic_store(&now_direction, 2);
-        // *str= "back\n";
-        rt_strncpy(str,"back\n",10);
+        const char *str = "back\n";
+        // rt_strncpy(str,"back\n",10);
         rt_device_write(serial, 0, str, rt_strlen(str));
     }
         
@@ -65,8 +67,8 @@ void snake_compare(rt_uint8_t key, rt_uint8_t repeat)
     {
         if (rt_atomic_load(&now_direction) != 1)
             rt_atomic_store(&now_direction, 3);
-            rt_strncpy(str,"right\n",10);
-        // *str = "right\n";
+            // rt_strncpy(str,"right\n",10);
+        const char *str = "right\n";
         rt_device_write(serial, 0, str, rt_strlen(str));
     }
         
@@ -84,8 +86,8 @@ void snake_compare(rt_uint8_t key, rt_uint8_t repeat)
     // 确认（暂停、页面冻结）
     if (repeat == 0 && (rt_strcmp(tmp, "73") == 0||rt_strcmp(tmp, "FF") == 0))
     {
-        *str = "OK\n";
-        rt_strncpy(str,"OK\n",10);
+       const char *str = "OK\n";
+        // rt_strncpy(str,"OK\n",10);
         rt_device_write(serial, 0, str, rt_strlen(str));
         if (page_chosen == 4&& page_stop == 0)
         {
diff --git a/my_pro/myproject.c b/my_pro/myproject.c
index 0dcf57e..44e7f07 100644
--- a/my_pro/myproject.c
+++ b/my_pro/myproject.c
@@ -468,7 +468,7 @@ void serial_init(void)
     rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
     // /* 设置接收回调函数 */
     rt_device_set_rx_indicate(serial, uart_input);
-    char str[] = "hello RTT\r\n";
+    const char *str = "hello RTT\r\n";
     /* 发送字符串 */
     rt_device_write(serial, 0, str, (sizeof(str) - 1));
      /* 创建 serial 线程 */