From e303c2ad89fe6c8279434b99022da7d754d8fc1e Mon Sep 17 00:00:00 2001
From: Daniel Agar <daniel@agar.ca>
Date: Sat, 8 Jul 2017 13:57:59 -0400
Subject: [PATCH] eagle tree airspeed allow negative differential pressure

---
 src/drivers/ets_airspeed/ets_airspeed.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/drivers/ets_airspeed/ets_airspeed.cpp b/src/drivers/ets_airspeed/ets_airspeed.cpp
index ad0a724f13..4fa7a17cab 100644
--- a/src/drivers/ets_airspeed/ets_airspeed.cpp
+++ b/src/drivers/ets_airspeed/ets_airspeed.cpp
@@ -154,12 +154,12 @@ ETSAirspeed::collect()
 		return ret;
 	}
 
-	uint16_t diff_pres_pa_raw = val[1] << 8 | val[0];
+	float diff_pres_pa_raw = (float)(val[1] << 8 | val[0]);
 
 	differential_pressure_s report;
 	report.timestamp = hrt_absolute_time();
 
-	if (diff_pres_pa_raw == 0) {
+	if (diff_pres_pa_raw < FLT_EPSILON) {
 		// a zero value indicates no measurement
 		// since the noise floor has been arbitrarily killed
 		// it defeats our stuck sensor detection - the best we