From 756b048e5aaeb2a7304b83ba2381315283cd1f7c Mon Sep 17 00:00:00 2001
From: Josh Stewart <josh@noisymime.org>
Date: Sun, 6 Dec 2015 17:28:40 +1100
Subject: [PATCH] Add protection for possible interrupt clash on 4g63 (Rare
 issue)

---
 decoders.ino | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/decoders.ino b/decoders.ino
index f6edce5..458bc1d 100644
--- a/decoders.ino
+++ b/decoders.ino
@@ -451,11 +451,13 @@ int getRPM_4G63()
   //Because these signals aren't even (Alternativing 110 and 70 degrees), this needs a special function
   if(currentStatus.RPM < configPage2.crankRPM) 
   { 
-  noInterrupts();
-  revolutionTime = (toothLastToothTime - toothLastMinusOneToothTime); //Note that trigger tooth angle changes between 70 and 110 depending on the last tooth that was seen  
-  interrupts();
-  revolutionTime = revolutionTime * 36;
-  return (triggerToothAngle * 60000000L) / revolutionTime;
+    int tempToothAngle;
+    noInterrupts();
+    tempToothAngle = triggerToothAngle;
+    revolutionTime = (toothLastToothTime - toothLastMinusOneToothTime); //Note that trigger tooth angle changes between 70 and 110 depending on the last tooth that was seen  
+    interrupts();
+    revolutionTime = revolutionTime * 36;
+    return (tempToothAngle * 60000000L) / revolutionTime;
   }
   else { return stdGetRPM(); }
 }