mirror of https://github.com/g4klx/MMDVM.git
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*
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* Copyright (C) 2016,2017,2018,2020 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(M17DEFINES_H)
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#define M17DEFINES_H
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const unsigned int M17_RADIO_SYMBOL_LENGTH = 5U; // At 24 kHz sample rate
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const unsigned int M17_FRAME_LENGTH_BITS = 384U;
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const unsigned int M17_FRAME_LENGTH_BYTES = M17_FRAME_LENGTH_BITS / 8U;
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const unsigned int M17_FRAME_LENGTH_SYMBOLS = M17_FRAME_LENGTH_BITS / 2U;
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const unsigned int M17_FRAME_LENGTH_SAMPLES = M17_FRAME_LENGTH_SYMBOLS * M17_RADIO_SYMBOL_LENGTH;
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const unsigned int M17_SYNC_LENGTH_BITS = 16U;
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const unsigned int M17_SYNC_LENGTH_SYMBOLS = M17_SYNC_LENGTH_BITS / 2U;
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const unsigned int M17_SYNC_LENGTH_SAMPLES = M17_SYNC_LENGTH_SYMBOLS * M17_RADIO_SYMBOL_LENGTH;
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const uint8_t M17_HEADER_SYNC_BYTES[] = {0x5DU, 0xDDU};
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const uint8_t M17_DATA_SYNC_BYTES[] = {0xDDU, 0xDDU};
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const uint8_t M17_SYNC_BYTES_LENGTH = 2U;
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const uint16_t M17_HEADER_SYNC_BITS = 0x5DDDU;
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const uint16_t M17_DAYA_SYNC_BITS = 0xDDDDU;
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// 5 D D D
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// 01 01 11 01 11 01 11 01
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// +3 +3 -3 +3 -3 +3 -3 +3
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const int8_t M17_HEADER_SYNC_SYMBOLS_VALUES[] = {+3, +3, -3, +3, -3, +3, -3, +3};
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const uint8_t M17_HEADER_SYNC_SYMBOLS = 0xD5U;
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// D D D D
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// 11 01 11 01 11 01 11 01
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// -3 +3 -3 +3 -3 +3 -3 +3
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const int8_t M17_DATA_SYNC_SYMBOLS_VALUES[] = {-3, +3, -3, +3, -3, +3, -3, +3};
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const uint8_t M17_DATA_SYNC_SYMBOLS = 0x55U;
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#endif
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