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121 lines
2.8 KiB
121 lines
2.8 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 Jonathan Naylor, G4KLX
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* Copyright (C) 2016,2017,2018 Andy Uribe, CA6JAU
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* Copyright (C) 2021-2024 Bryan Biedenkapp, N2PLL
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*
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*/
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/**
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* @file P25RX.h
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* @ingroup p25_hfw
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* @file P25RX.h
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* @ingroup p25_hfw
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*/
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#if !defined(__P25_RX_H__)
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#define __P25_RX_H__
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#include "Defines.h"
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#include "p25/P25Defines.h"
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namespace p25
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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 P25 Receiver State
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* @ingroup p25_hfw
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*/
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enum P25RX_STATE {
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P25RXS_NONE, //! None
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P25RXS_SYNC, //! Found Sync
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P25RXS_VOICE, //! Voice Data
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P25RXS_DATA //! PDU 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 P25 mode operation.
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* @ingroup p25_hfw
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*/
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class DSP_FW_API P25RX {
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public:
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/**
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* @brief Initializes a new instance of the P25RX class.
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*/
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P25RX();
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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 P25 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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/**
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* @brief Sets the P25 NAC.
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* @param nac Network Access Code.
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*/
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void setNAC(uint16_t nac);
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private:
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uint64_t m_bitBuffer;
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uint8_t m_buffer[P25_PDU_FRAME_LENGTH_BYTES + 3U];
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uint16_t m_dataPtr;
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uint16_t m_endPtr;
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uint16_t m_pduEndPtr;
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uint16_t m_lostCount;
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uint16_t m_nac;
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P25RX_STATE m_state;
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uint8_t m_duid;
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/**
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* @brief Helper to process P25 bits.
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* @param bit
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*/
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void processBit(bool bit);
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/**
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* @brief Helper to process LDU P25 bits.
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* @param bit
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*/
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void processVoice(bool bit);
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/**
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* @brief Helper to process PDU P25 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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* @returns bool
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*/
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bool correlateSync();
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/**
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* @brief Helper to decode the P25 NID.
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* @returns bool True, if P25 NID was decoded, otherwise false.
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*/
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bool decodeNid();
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};
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} // namespace p25
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#endif // __P25_RX_H__
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