diff --git a/include/util/bitfieldindex.h b/include/util/bitfieldindex.h
new file mode 100644
index 000000000..166712282
--- /dev/null
+++ b/include/util/bitfieldindex.h
@@ -0,0 +1,53 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015 F4EXB                                                      //
+// written by Edouard Griffiths                                                  //
+//                                                                               //
+// This program is free software; you can redistribute it and/or modify          //
+// it under the terms of the GNU General Public License as published by          //
+// the Free Software Foundation as version 3 of the License, or                  //
+//                                                                               //
+// This program is distributed in the hope that it will be useful,               //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef _UTIL_BITFIELDINDEX_H_
+#define _UTIL_BITFIELDINDEX_H_
+
+#include <stdint.h>
+
+template <unsigned int size>
+struct BitfieldIndex 
+{
+    uint32_t v : size;
+    
+    BitfieldIndex() {}
+    BitfieldIndex(int i) { v = i; }
+    
+    BitfieldIndex& operator=(const BitfieldIndex& rhs) { v = rhs.v; return *this; }
+    BitfieldIndex& operator=(const int& rhi) { v = rhi; return *this; }
+    BitfieldIndex& operator++() { v++; return *this; }
+    BitfieldIndex operator++(int) { BitfieldIndex x(*this); ++(*this); return x; }
+    BitfieldIndex& operator+=(const BitfieldIndex& b) { v += b.v; return *this; }     
+    BitfieldIndex& operator-=(const BitfieldIndex& b) { v -= b.v; return *this; }
+    BitfieldIndex& operator+=(int i) { v += i; return *this; }     
+    BitfieldIndex& operator-=(int i) { v -= i; return *this; }
+    BitfieldIndex operator+(const BitfieldIndex& b) const { BitfieldIndex x(*this); x.v += b.v; return x; }  
+    BitfieldIndex operator-(const BitfieldIndex& b) const { BitfieldIndex x(*this); x.v -= b.v; return x; }  
+    BitfieldIndex operator+(int i) const { BitfieldIndex x(*this); x.v += i; return x; }  
+    BitfieldIndex operator-(int i) const { BitfieldIndex x(*this); x.v -= i; return x; }  
+
+    operator int() const { return v; }
+};
+
+template <unsigned int size>
+BitfieldIndex<size> operator+(const BitfieldIndex<size> &a, const BitfieldIndex<size> &b) { BitfieldIndex<size> x; x.v = x.a + x.b; return x; }
+    
+template <unsigned int size>
+BitfieldIndex<size> operator-(const BitfieldIndex<size> &a, const BitfieldIndex<size> &b) { BitfieldIndex<size> x; x.v = x.a - x.b; return x; }
+
+#endif // _UTIL_BITFIELDINDEX_H_