Initial P25 test support.

P25RX.h

@@ -0,0 +1,59 @@
+/*
+ *   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
+ *   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(P25RX_H)
+#define  P25RX_H
+
+#include "Config.h"
+#include "P25Defines.h"
+
+enum P25RX_STATE {
+  P25RXS_NONE,
+  P25RXS_DATA
+};
+
+class CP25RX {
+public:
+  CP25RX();
+
+  void samples(const q15_t* samples, uint8_t length);
+
+  void reset();
+
+private:
+  uint32_t    m_pll;
+  bool        m_prev;
+  P25RX_STATE m_state;
+  uint32_t    m_symbolBuffer;
+  uint64_t    m_bitBuffer;
+  q15_t       m_symbols[P25_SYNC_LENGTH_SYMBOLS];
+  uint8_t     m_outBuffer[P25_LDU_FRAME_LENGTH_BYTES + 3U];
+  uint8_t*    m_buffer;
+  uint16_t    m_bufferPtr;
+  uint16_t    m_symbolPtr;
+  uint16_t    m_lostCount;
+  uint16_t    m_rssiCount;
+  q15_t       m_centre;
+  q15_t       m_threshold;
+
+  void processNone(q15_t sample);
+  void processData(q15_t sample);
+};
+
+#endif
+