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AX25Demodulator.h
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AX25Demodulator.h
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/*
* Copyright (C) 2020 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "Config.h"
#if defined(MODE_AX25)
#if !defined(AX25Demodulator_H)
#define AX25Demodulator_H
#include "AX25Frame.h"
#include "AX25Twist.h"
enum AX25_STATE {
AX25_IDLE,
AX25_SYNC,
AX25_RECEIVE
};
class CAX25Demodulator {
public:
CAX25Demodulator(int8_t n);
bool process(q15_t* samples, uint8_t length, CAX25Frame& frame);
void setTwist(int8_t n);
bool isDCD();
private:
CAX25Frame m_frame;
CAX25Twist m_twist;
arm_fir_instance_q15 m_lpfFilter;
q15_t m_lpfState[70U]; // NoTaps + BlockSize - 1, 48 + 20 - 1 plus some spare
bool* m_delayLine;
uint16_t m_delayPos;
bool m_nrziState;
arm_fir_instance_f32 m_pllFilter;
float32_t m_pllState[20U]; // NoTaps + BlockSize - 1, 7 + 1 - 1 plus some spare
bool m_pllLast;
uint8_t m_pllBits;
float32_t m_pllCount;
float32_t m_pllJitter;
bool m_pllDCD;
float32_t m_iirHistory[5U];
uint16_t m_hdlcOnes;
bool m_hdlcFlag;
uint16_t m_hdlcBuffer;
uint16_t m_hdlcBits;
AX25_STATE m_hdlcState;
bool delay(bool b);
bool NRZI(bool b);
bool PLL(bool b);
bool HDLC(bool b);
float32_t iir(float32_t input);
};
#endif
#endif