diff --git a/hw/bsp/stm32f303disc/board_stm32f303disc.c b/hw/bsp/stm32f303disc/board_stm32f303disc.c
index d2f6244f7..e4afbf8ce 100644
--- a/hw/bsp/stm32f303disc/board_stm32f303disc.c
+++ b/hw/bsp/stm32f303disc/board_stm32f303disc.c
@@ -97,6 +97,12 @@ void board_led_control(bool state)
   HAL_GPIO_WritePin(GPIOE, GPIO_PIN_9, state);
 }
 
+uint32_t board_button_read(void)
+{
+  // TODO implement
+  return 0;
+}
+
 /*------------------------------------------------------------------*/
 /* TUSB HAL MILLISECOND
  *------------------------------------------------------------------*/
diff --git a/hw/bsp/stm32f407g_disc1/board_stm32f407g_disc1.c b/hw/bsp/stm32f407g_disc1/board_stm32f407g_disc1.c
index d7b4a4bd3..2622dde11 100644
--- a/hw/bsp/stm32f407g_disc1/board_stm32f407g_disc1.c
+++ b/hw/bsp/stm32f407g_disc1/board_stm32f407g_disc1.c
@@ -91,6 +91,12 @@ void board_led_control(bool state)
   }
 }
 
+uint32_t board_button_read(void)
+{
+  // TODO implement
+  return 0;
+}
+
 
 /*------------------------------------------------------------------*/
 /* TUSB HAL MILLISECOND