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90 lines
2.1 KiB
90 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Digital Voice Modem - Hotspot Firmware
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright (C) 2015,2016,2017,2018,2020 Jonathan Naylor, G4KLX
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* Copyright (C) 2022 Bryan Biedenkapp, N2PLL
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*
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*/
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/**
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* @file NXDNRX.h
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* @ingroup nxdn_hfw
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* @file NXDNRX.cpp
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* @ingroup nxdn_hfw
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*/
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#if !defined(__NXDN_RX_H__)
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#define __NXDN_RX_H__
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#include "Defines.h"
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#include "nxdn/NXDNDefines.h"
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namespace nxdn
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{
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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/**
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* @brief NXDN Receiver State
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* @ingroup nxdn_hfw
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*/
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enum NXDNRX_STATE {
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NXDNRXS_NONE, //! None
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NXDNRXS_DATA //! Data
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};
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// ---------------------------------------------------------------------------
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// Class Declaration
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// ---------------------------------------------------------------------------
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/**
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* @brief Implements receiver logic for NXDN mode operation.
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* @ingroup nxdn_mfw
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*/
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class DSP_FW_API NXDNRX {
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public:
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/**
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* @brief Initializes a new instance of the NXDNRX class.
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*/
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NXDNRX();
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/**
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* @brief Helper to reset data values to defaults.
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*/
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void reset();
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/**
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* @brief Sample NXDN bits from the air interface.
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* @param bit
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*/
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void databit(bool bit);
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private:
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uint64_t m_bitBuffer;
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uint8_t m_outBuffer[NXDN_FRAME_LENGTH_BYTES + 3U];
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uint8_t* m_buffer;
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uint16_t m_dataPtr;
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uint16_t m_lostCount;
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NXDNRX_STATE m_state;
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/**
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* @brief Helper to process NXDN data bits.
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* @param bit
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*/
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void processData(bool bit);
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/**
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* @brief Frame synchronization correlator.
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* @param first
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*/
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bool correlateSync(bool first = false);
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};
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} // namespace nxdn
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#endif // __NXDN_RX_H__
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