From 1c5607b42deed5e441c2c005df0bdc51e289d970 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Fri, 7 Apr 2017 17:45:10 +1000
Subject: [PATCH] AP_RPM: fixed build for aero-fc

---
 libraries/AP_RPM/RPM_Pin.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libraries/AP_RPM/RPM_Pin.cpp b/libraries/AP_RPM/RPM_Pin.cpp
index 520a5fc038..9e975a1b63 100644
--- a/libraries/AP_RPM/RPM_Pin.cpp
+++ b/libraries/AP_RPM/RPM_Pin.cpp
@@ -72,6 +72,8 @@ void AP_RPM_Pin::update(void)
     if (last_pin != get_pin()) {
         last_pin = get_pin();
         uint32_t gpio = 0;
+
+#ifdef GPIO_GPIO0_INPUT
         switch (last_pin) {
         case 50:
             gpio = GPIO_GPIO0_INPUT;
@@ -92,7 +94,8 @@ void AP_RPM_Pin::update(void)
             gpio = GPIO_GPIO5_INPUT;
             break;
         }
-
+#endif // GPIO_GPIO5_INPUT
+        
         // uninstall old handler if installed
         if (last_gpio != 0) {
             stm32_gpiosetevent(last_gpio, false, false, false, nullptr);