diff --git a/lib/stm32/exti2.c b/lib/stm32/exti2.c
index bea2f4d4..7c48b911 100644
--- a/lib/stm32/exti2.c
+++ b/lib/stm32/exti2.c
@@ -78,6 +78,14 @@ void exti_reset_request(u32 extis)
 	EXTI_PR = extis;
 }
 
+/*
+ * Check the flag of a given EXTI interrupt.
+ * */
+u32 exti_get_flag_status(u32 exti)
+{
+	return EXTI_PR & exti;
+}
+
 /*
  * Remap an external interrupt line to the corresponding pin on the
  * specified GPIO port.