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71 lines
2.3 KiB
71 lines
2.3 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) 2016,2017,2018 Jonathan Naylor, G4KLX
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*
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*/
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/**
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* @defgroup nxdn_hfw Next Generation Digital Narrowband
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* @brief Implementation for the NXDN standard.
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* @ingroup hotspot_fw
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*
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* @file NXDNDefines.h
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* @ingroup nxdn_hfw
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*/
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#if !defined(__NXDN_DEFINES_H__)
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#define __NXDN_DEFINES_H__
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#include "Defines.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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* @addtogroup nxdn_hfw
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* @{
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*/
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const uint32_t NXDN_RADIO_SYMBOL_LENGTH = 10U; // At 24 kHz sample rate
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const uint32_t NXDN_FRAME_LENGTH_BITS = 384U;
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const uint32_t NXDN_FRAME_LENGTH_BYTES = NXDN_FRAME_LENGTH_BITS / 8U;
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const uint32_t NXDN_FRAME_LENGTH_SYMBOLS = NXDN_FRAME_LENGTH_BITS / 2U;
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const uint32_t NXDN_FRAME_LENGTH_SAMPLES = NXDN_FRAME_LENGTH_SYMBOLS * NXDN_RADIO_SYMBOL_LENGTH;
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const uint32_t NXDN_FSW_LENGTH_BITS = 20U;
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const uint32_t NXDN_FSW_LENGTH_SYMBOLS = NXDN_FSW_LENGTH_BITS / 2U;
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const uint32_t NXDN_FSW_LENGTH_SAMPLES = NXDN_FSW_LENGTH_SYMBOLS * NXDN_RADIO_SYMBOL_LENGTH;
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const uint8_t NXDN_FSW_BYTES[] = { 0xCDU, 0xF5U, 0x90U };
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const uint8_t NXDN_FSW_BYTES_MASK[] = { 0xFFU, 0xFFU, 0xF0U };
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const uint8_t NXDN_FSW_BYTES_LENGTH = 3U;
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const uint32_t NXDN_FSW_BITS = 0x000CDF59U;
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const uint32_t NXDN_FSW_BITS_MASK = 0x000FFFFFU;
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const uint8_t NXDN_PREAMBLE[] = { 0x57U, 0x75U, 0xFDU };
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const uint8_t NXDN_SYNC = 0x5FU;
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// C D F 5 9
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// 11 00 11 01 11 11 01 01 10 01
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// -3 +1 -3 +3 -3 -3 +3 +3 -1 +3
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const int8_t NXDN_FSW_SYMBOLS_VALUES[] = {-3, +1, -3, +3, -3, -3, +3, +3, -1, +3};
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const uint16_t NXDN_FSW_SYMBOLS = 0x014DU;
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const uint16_t NXDN_FSW_SYMBOLS_MASK = 0x03FFU;
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// 538 = NXDN_FRAME_LENGTH_BYTES * 11 + 10 (BUFFER_LEN = NXDN_FRAME_LENGTH_BYTES * NO_OF_FRAMES)
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const uint32_t NXDN_TX_BUFFER_LEN = 538U; // 11 frames + pad
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/** @} */
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} // namespace nxdn
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#endif // __NXDN_DEFINES_H__
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