diff --git a/bsp/bluetrum/ab32vg1-ab-prougen/board/board.c b/bsp/bluetrum/ab32vg1-ab-prougen/board/board.c
index 01940cae22..ec128bb1f0 100644
--- a/bsp/bluetrum/ab32vg1-ab-prougen/board/board.c
+++ b/bsp/bluetrum/ab32vg1-ab-prougen/board/board.c
@@ -127,3 +127,8 @@ void rt_hw_board_init(void)
     rt_components_board_init();
 #endif
 }
+
+void rt_hw_us_delay(rt_uint32_t us)
+{
+
+}