diff --git a/firmware/hw_layer/digital_input/digital_input_exti.cpp b/firmware/hw_layer/digital_input/digital_input_exti.cpp
index a122aca5ba..d21b7807ad 100644
--- a/firmware/hw_layer/digital_input/digital_input_exti.cpp
+++ b/firmware/hw_layer/digital_input/digital_input_exti.cpp
@@ -19,6 +19,11 @@
  */
 
 static ioportmask_t ext_used = 0;
+static const char *EXT_USED[16];
+
+void efiExtiInit() {
+	memset(EXT_USED, 0, sizeof(EXT_USED));
+}
 
 // EXT is not able to give you the front direction but you could read the pin in the callback.
 void efiExtiEnablePin(const char *msg, brain_pin_e brainPin, uint32_t mode, palcallback_t cb, void *cb_data) {
@@ -54,6 +59,7 @@ void efiExtiEnablePin(const char *msg, brain_pin_e brainPin, uint32_t mode, palc
 
 	/* mark used */
 	ext_used |= PAL_PORT_BIT(index);
+	EXT_USED[index] = msg;
 }
 
 void efiExtiDisablePin(brain_pin_e brainPin)
diff --git a/firmware/hw_layer/digital_input/digital_input_exti.h b/firmware/hw_layer/digital_input/digital_input_exti.h
index 6d4ab49f07..79a6dac1fd 100644
--- a/firmware/hw_layer/digital_input/digital_input_exti.h
+++ b/firmware/hw_layer/digital_input/digital_input_exti.h
@@ -1,5 +1,5 @@
 /*
- * digital_input_exti.h
+ * @file digital_input_exti.h
  *
  *  Created on: Dec 18, 2018
  * @author Andrey Belomutskiy, (c) 2012-2020
@@ -10,6 +10,7 @@
 #include "digital_input.h"
 
 #if HAL_USE_PAL
+void efiExtiInit();
 void efiExtiEnablePin(const char *msg, brain_pin_e pin, uint32_t mode, palcallback_t cb, void *cb_data);
 void efiExtiDisablePin(brain_pin_e brainPin);
 #endif /* HAL_USE_PAL */