From 8cea9a3beb93566c1f318b2793bd85e2ebeaedfd Mon Sep 17 00:00:00 2001
From: timo <timo.rokitte@online.de>
Date: Wed, 23 May 2018 20:30:59 +0200
Subject: [PATCH] HAL_F4Light: Fixed I2C initalization for Airspeed sensor on
 MatekF405CTR board

---
 libraries/AP_HAL_F4Light/I2CDevice.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libraries/AP_HAL_F4Light/I2CDevice.cpp b/libraries/AP_HAL_F4Light/I2CDevice.cpp
index 6801568681..1398eb4d7a 100644
--- a/libraries/AP_HAL_F4Light/I2CDevice.cpp
+++ b/libraries/AP_HAL_F4Light/I2CDevice.cpp
@@ -187,13 +187,16 @@ void I2CDevice::init(){
     if(_dev) {
         i2c_init(_dev, _offs, _slow?I2C_250KHz_SPEED:I2C_400KHz_SPEED);
 
-    }else {
+    }else if (s_i2c){
         s_i2c->init( );
 
         if(_slow) {
             s_i2c->set_low_speed(true);
         }
     }
+    else { // neither hardware nor software initalization was successful
+        return;
+    }
     _initialized=true;
 }