From e862c349e808552263b3dc9193f86ab1ced3566b Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Thu, 8 Nov 2018 15:20:17 +1100
Subject: [PATCH] AP_RPM: set pin to input before attaching interrupt

this fixes input on AUX6 on CubeBlack
---
 libraries/AP_RPM/RPM_Pin.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libraries/AP_RPM/RPM_Pin.cpp b/libraries/AP_RPM/RPM_Pin.cpp
index 1353951cfa..79b40a9e64 100644
--- a/libraries/AP_RPM/RPM_Pin.cpp
+++ b/libraries/AP_RPM/RPM_Pin.cpp
@@ -60,6 +60,7 @@ void AP_RPM_Pin::update(void)
         // attach to new pin
         last_pin = get_pin();
         if (last_pin) {
+            hal.gpio->pinMode(last_pin, HAL_GPIO_INPUT);
             if (!hal.gpio->attach_interrupt(
                     last_pin,
                     FUNCTOR_BIND_MEMBER(&AP_RPM_Pin::irq_handler, void, uint8_t, bool, uint32_t),