mirror of https://github.com/g4klx/MMDVM.git
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/*
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* Copyright (C) 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(AX25Demodulator_H)
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#define AX25Demodulator_H
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#include "Config.h"
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#include "AX25Frame.h"
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enum AX25_STATE {
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AX25_IDLE,
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AX25_SYNC,
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AX25_RECEIVE
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};
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class CAX25Demodulator {
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public:
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CAX25Demodulator(float32_t* coeffs, uint16_t length);
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bool process(const q15_t* samples, uint8_t length, CAX25Frame& frame);
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private:
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CAX25Frame m_frame;
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arm_fir_instance_f32 m_audioFilter;
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float32_t m_audioState[20U];
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arm_fir_instance_q15 m_lpfFilter;
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q15_t m_lpfState[120U]; // NoTaps + BlockSize - 1, 96 + 20 - 1 plus some spare
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bool* m_delayLine;
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uint16_t m_delayPos;
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bool m_nrziState;
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arm_fir_instance_f32 m_pllFilter;
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float32_t m_pllState[7U];
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bool m_pllLast;
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uint8_t m_pllBits;
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float32_t m_pllCount;
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uint16_t m_hdlcOnes;
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bool m_hdlcFlag;
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uint16_t m_hdlcBuffer;
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uint16_t m_hdlcBits;
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AX25_STATE m_hdlcState;
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bool delay(bool b);
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bool NRZI(bool b);
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bool PLL(bool b);
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bool HDLC(bool b);
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};
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#endif
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