From 2bdda6be71792b2c9b8e032edc25351a48ab92d2 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Mon, 21 Sep 2020 18:26:53 +1000
Subject: [PATCH] AP_HAL: added timer_tick() on GPIO

---
 libraries/AP_HAL/GPIO.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/AP_HAL/GPIO.h b/libraries/AP_HAL/GPIO.h
index 742076d7ed..48ca9eca4b 100644
--- a/libraries/AP_HAL/GPIO.h
+++ b/libraries/AP_HAL/GPIO.h
@@ -73,4 +73,7 @@ public:
 
     /* return true if USB cable is connected */
     virtual bool    usb_connected(void) = 0;
+
+    // optional timer tick
+    virtual void timer_tick(void) {};
 };