Make the D-Star demodulator stiffer when locked.

DStarRX.h

@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) 2015 by Jonathan Naylor G4KLX
+ *   Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
  *
  *   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
@@ -39,6 +39,7 @@ public:
 private:
   uint32_t     m_pll;
   bool         m_prev;
+  uint32_t     m_inc;
   DSRX_STATE   m_rxState;
   uint32_t     m_patternBuffer;
   uint8_t      m_rxBuffer[100U];
@@ -62,6 +63,7 @@ private:
   void    viterbiDecode(int* data);
   void    traceBack();
   bool    checksum(const uint8_t* header) const;
+  void    locked(bool lock);
 };
 
 #endif