mirror of https://github.com/g4klx/MMDVM.git
87 lines
2.1 KiB
C++
87 lines
2.1 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(FMCTCSSRX_H)
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#define FMCTCSSRX_H
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#include "Config.h"
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enum CTCSSState
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{
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CTS_NONE = 0,
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CTS_READY = 1,
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CTS_VALID = 2,
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CTS_READY_VALID = CTS_READY | CTS_VALID
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};
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inline CTCSSState operator|(CTCSSState a, CTCSSState b)
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{
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return static_cast<CTCSSState>(static_cast<uint8_t>(a) | static_cast<uint8_t>(b));
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}
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inline CTCSSState operator&(CTCSSState a, CTCSSState b)
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{
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return static_cast<CTCSSState>(static_cast<uint8_t>(a) & static_cast<uint8_t>(b));
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}
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inline CTCSSState operator~(CTCSSState a)
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{
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return static_cast<CTCSSState>(~(static_cast<uint8_t>(a)));
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}
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#define CTCSS_READY(a) ((a & CTS_READY) != 0)
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#define CTCSS_NOT_READY(a) ((a & CTS_READY) == 0)
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#define CTCSS_VALID(a) ((a & CTS_VALID) != 0)
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#define CTCSS_NOT_VALID(a) ((a & CTS_VALID) == 0)
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class CFMCTCSSRX {
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public:
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CFMCTCSSRX();
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uint8_t setParams(uint8_t frequency, uint8_t threshold, q15_t rxLevel);
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CTCSSState process(q15_t sample);
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CTCSSState getState();
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void reset();
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private:
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static inline q15_t q15Division(q15_t a, q15_t divisor)
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{
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q31_t a31 = q31_t(a) << 16;
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if (((a >> 31) & 1) == ((divisor >> 15) & 1))
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a31 += divisor >> 1;
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else
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a31 -= divisor >> 1;
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return a31 / divisor;
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}
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q63_t m_coeffDivTwo;
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q31_t m_threshold;
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uint16_t m_count;
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q31_t m_q0;
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q31_t m_q1;
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CTCSSState m_result;
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q31_t m_rxLevelInverse;
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};
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#endif
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