From 30b50a858d3c38386e2594d1cc02a3f17a0774b4 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Fri, 11 Jan 2013 21:17:34 +1100
Subject: [PATCH] Filter: fixed a warning on PX4

---
 libraries/Filter/LowPassFilter.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/Filter/LowPassFilter.h b/libraries/Filter/LowPassFilter.h
index 32278e8d8a..09fb1601a1 100644
--- a/libraries/Filter/LowPassFilter.h
+++ b/libraries/Filter/LowPassFilter.h
@@ -78,7 +78,7 @@ template <class T>
 void LowPassFilter<T>::set_cutoff_frequency(float time_step, float cutoff_freq)
 {
     // calculate alpha
-    float rc = 1/(2*M_PI*cutoff_freq);
+    float rc = 1/(2*(float)M_PI*cutoff_freq);
     _alpha = time_step / (time_step + rc);
 }