From 355bb4669da05d202054b8265695e9878fd612c2 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Sun, 28 May 2017 15:21:53 -0700
Subject: altoslib: Ignore invalid accel cal values

When both are the same, something is wrong.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 altoslib/AltosConvert.java | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'altoslib/AltosConvert.java')

diff --git a/altoslib/AltosConvert.java b/altoslib/AltosConvert.java
index 5b3ff391..a252abdf 100644
--- a/altoslib/AltosConvert.java
+++ b/altoslib/AltosConvert.java
@@ -403,6 +403,10 @@ public class AltosConvert {
 
 		double counts_per_g = (plus_g - minus_g) / 2.0;
 		double counts_per_mss = counts_per_g / gravity;
+
+		if (counts_per_mss == 0)
+			return AltosLib.MISSING;
+
 		return (sensor - ground) / counts_per_mss;
 	}
 
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