You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.1 KiB
90 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Digital Voice Modem - Hotspot Firmware
|
|
* GPLv2 Open Source. Use is subject to license terms.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* Copyright (C) 2015,2016,2017,2018,2020 Jonathan Naylor, G4KLX
|
|
* Copyright (C) 2022 Bryan Biedenkapp, N2PLL
|
|
*
|
|
*/
|
|
/**
|
|
* @file NXDNRX.h
|
|
* @ingroup nxdn_hfw
|
|
* @file NXDNRX.h
|
|
* @ingroup nxdn_hfw
|
|
*/
|
|
#if !defined(__NXDN_RX_H__)
|
|
#define __NXDN_RX_H__
|
|
|
|
#include "Defines.h"
|
|
#include "nxdn/NXDNDefines.h"
|
|
|
|
namespace nxdn
|
|
{
|
|
// ---------------------------------------------------------------------------
|
|
// Constants
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* @brief NXDN Receiver State
|
|
* @ingroup nxdn_hfw
|
|
*/
|
|
enum NXDNRX_STATE {
|
|
NXDNRXS_NONE, //! None
|
|
NXDNRXS_DATA //! Data
|
|
};
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Class Declaration
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* @brief Implements receiver logic for NXDN mode operation.
|
|
* @ingroup nxdn_mfw
|
|
*/
|
|
class DSP_FW_API NXDNRX {
|
|
public:
|
|
/**
|
|
* @brief Initializes a new instance of the NXDNRX class.
|
|
*/
|
|
NXDNRX();
|
|
|
|
/**
|
|
* @brief Helper to reset data values to defaults.
|
|
*/
|
|
void reset();
|
|
|
|
/**
|
|
* @brief Sample NXDN bits from the air interface.
|
|
* @param bit
|
|
*/
|
|
void databit(bool bit);
|
|
|
|
private:
|
|
uint64_t m_bitBuffer;
|
|
uint8_t m_outBuffer[NXDN_FRAME_LENGTH_BYTES + 3U];
|
|
uint8_t* m_buffer;
|
|
|
|
uint16_t m_dataPtr;
|
|
|
|
uint16_t m_lostCount;
|
|
|
|
NXDNRX_STATE m_state;
|
|
|
|
/**
|
|
* @brief Helper to process NXDN data bits.
|
|
* @param bit
|
|
*/
|
|
void processData(bool bit);
|
|
|
|
/**
|
|
* @brief Frame synchronization correlator.
|
|
* @param first
|
|
*/
|
|
bool correlateSync(bool first = false);
|
|
};
|
|
} // namespace nxdn
|
|
|
|
#endif // __NXDN_RX_H__
|