1 files changed, 4 insertions, 3 deletions
diff --git a/examples/rt-link/rtlink_dev_example.c b/examples/rt-link/rtlink_dev_example.c
index 027292769d..fb3629538a 100644
--- a/examples/rt-link/rtlink_dev_example.c
+++ b/examples/rt-link/rtlink_dev_example.c
@@ -311,18 +311,18 @@ void create_thead_to_test_speed(rt_uint8_t mutil_num)
     }
 }
 
-static void rtlink_dwrite(int argc, char *argv[])
+static rt_err_t rtlink_dwrite(int argc, char *argv[])
 {
     char *data = RT_NULL;
     rt_size_t length = 0;
     rt_uint16_t count = 0;
-    rt_size_t ret = RT_ERROR;
+    rt_size_t ret = -RT_ERROR;
 
     rt_device_t dev = rt_device_find(RTLINK01);
     if (dev == RT_NULL)
     {
         LOG_E("device not find!");
-        return ;
+        return ret;
     }
 
     if (argc == 1)
@@ -352,6 +352,7 @@ static void rtlink_dwrite(int argc, char *argv[])
             LOG_E("Invalid parameter.");
         }
     }
+    return ret;
 }
 MSH_CMD_EXPORT(rtlink_dwrite, rtlink device interface example);