Initial commit

YSFRX.h

@@ -0,0 +1,70 @@
+/*
+ *   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(YSFRX_H)
+#define  YSFRX_H
+
+#include "Config.h"
+#include "YSFDefines.h"
+
+enum YSFRX_STATE {
+  YSFRXS_NONE,
+  YSFRXS_DATA
+};
+
+class CYSFRX {
+public:
+  CYSFRX();
+
+  void samples(const q15_t* samples, uint8_t length);
+
+  void reset();
+
+private:
+  uint32_t    m_pll;
+  bool        m_prev;
+  YSFRX_STATE m_state;
+  uint32_t    m_symbolBuffer;
+  uint64_t    m_bitBuffer;
+  q15_t       m_symbols[YSF_SYNC_LENGTH_SYMBOLS];
+  uint8_t     m_outBuffer[YSF_FRAME_LENGTH_BYTES + 1U];
+  uint8_t*    m_buffer;
+  uint16_t    m_bufferPtr;
+  uint16_t    m_symbolPtr;
+  uint16_t    m_lostCount;
+  q15_t       m_centre;
+  q15_t       m_threshold;
+  uint16_t    m_metrics1[16U];
+  uint16_t    m_metrics2[16U];
+  uint16_t*   m_oldMetrics;
+  uint16_t*   m_newMetrics;
+  uint64_t    m_decisions[100U];
+  uint64_t*   m_dp;
+
+  void processNone(q15_t sample);
+  void processData(q15_t sample);
+  bool rxFICH(uint8_t* data, uint8_t* FICH);
+  void viterbiDecode(uint8_t s0, uint8_t s1);
+  void chainback(uint8_t* out);
+  uint32_t getSyndrome23127(uint32_t pattern) const;
+  uint32_t golay24128(const uint8_t* bytes) const;
+  bool checksum(const uint8_t* fich) const;
+};
+
+#endif
+