Initial commit

DStarRX.h

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+/*
+ *   Copyright (C) 2015 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
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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 for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(DSTARRX_H)
+#define  DSTARRX_H
+
+#include "Config.h"
+#include "DStarDefines.h"
+
+enum DSRX_STATE {
+  DSRXS_NONE,
+  DSRXS_HEADER,
+  DSRXS_DATA
+};
+
+class CDStarRX {
+public:
+  CDStarRX();
+
+  void samples(const q15_t* samples, uint8_t length);
+
+  void reset();
+
+private:
+  uint32_t     m_pll;
+  bool         m_prev;
+  DSRX_STATE   m_rxState;
+  uint32_t     m_patternBuffer;
+  uint8_t      m_rxBuffer[100U];
+  unsigned int m_rxBufferBits;
+  unsigned int m_dataBits;
+  unsigned int m_mar;
+  int          m_pathMetric[4U];
+  unsigned int m_pathMemory0[42U];
+  unsigned int m_pathMemory1[42U];
+  unsigned int m_pathMemory2[42U];
+  unsigned int m_pathMemory3[42U];
+  uint8_t      m_fecOutput[42U];
+  q15_t        m_samples[DSTAR_DATA_SYNC_LENGTH_BITS];
+  uint8_t      m_samplesPtr;
+
+  void    processNone(bool bit);
+  void    processHeader(bool bit);
+  void    processData(bool bit);
+  bool    rxHeader(uint8_t* in, uint8_t* out);
+  void    acs(int* metric);
+  void    viterbiDecode(int* data);
+  void    traceBack();
+  bool    checksum(const uint8_t* header) const;
+};
+
+#endif
+