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75 lines
2.9 KiB
75 lines
2.9 KiB
/**
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* Digital Voice Modem - DSP Firmware (Hotspot)
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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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* @package DVM / DSP Firmware (Hotspot)
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*
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*/
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//
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// Based on code from the MMDVM project. (https://github.com/g4klx/MMDVM)
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// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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//
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/*
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* Copyright (C) 2016,2017,2018 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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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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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const uint32_t NXDN_TX_BUFFER_LEN = 1018U; // 2026 = NXDN_FRAME_LENGTH_BYTES * 21 + 10 (BUFFER_LEN = NXDN_FRAME_LENGTH_BYTES * NO_OF_FRAMES)
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} // namespace nxdn
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#endif // __NXDN_DEFINES_H__
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