diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/dbn_ble_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/dbn_ble_srv.c
index 4d655ed..fa73d31 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/dbn_ble_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/dbn_ble_srv.c
@@ -30,6 +30,12 @@ extern uint8_t loop1_FLAG_CUT;
 
 void clear_ble_notify_buf(BLE_Notify_Buf * buf)
 {
+    if(buf->flag || buf->len)
+    {
+        PRINT("CLR_NTF: buf=%08lx flag=%d len=%d ret=%08lx\n",
+               (unsigned long)buf, buf->flag, buf->len,
+               (unsigned long)__builtin_return_address(0));
+    }
     buf->len = 0;
     buf->flag = 0;
     memset(buf, 0, MAX_BLE_Notify_Buf_LEN);