mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2025-05-28 07:38:24 +00:00
318720f364
Left in the message for the moment, because there are likely to be parameters needed at some point.
99 lines
2.5 KiB
C++
99 lines
2.5 KiB
C++
/*
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* This file is part of PortaPack.
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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, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __EXTRACT_FRAME_PAGER_H__
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#define __EXTRACT_FRAME_PAGER_H__
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#include <bitset>
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using namespace std;
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// This class extracts a POCSAG message from a FM demodulated sample stream
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// TODO extend to also process FLEX frames
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#define MAX_CODEWORDS (16)
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class extract_frame_pager
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{
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public:
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struct FIFOStruct {
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unsigned long codeword;
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int numBits;
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};
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#define BIT_BUF_SIZE (64)
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enum BitsState { BS_SEARCHING, BS_SYNC, BS_LOCKED };
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enum DetectionMode { DM_STATIC, DM_DYNAMIC, DM_DIFFERENTIAL };
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extract_frame_pager();
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virtual ~extract_frame_pager();
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void resetVals();
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void setFrameExtractParams(long a_samplesPerSec, long a_maxBaud = 8000, long a_minBaud = 200, long maxRunOfSameValue = 32);
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int processDemodulatedSamples(float * sampleBuff, int noOfSamples);
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int extractFrames();
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virtual int OnDataFrame(int len, int baud) = 0;
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virtual int OnDataWord(uint32_t word, int pos) = 0;
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void init();
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void storeBit();
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short getBit();
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int getNoOfBits();
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uint32_t getRate();
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protected:
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uint32_t m_averageSymbolLen_1024;
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uint32_t m_lastStableSymbolLen_1024;
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uint32_t m_samplesPerSec;
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uint32_t m_goodTransitions;
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uint32_t m_badTransitions;
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private:
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uint32_t m_sampleNo;
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float m_sample;
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float m_valMid;
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float m_lastSample;
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BitsState m_state;
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uint32_t m_lastTransPos_1024;
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uint32_t m_lastSingleBitPos_1024;
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uint32_t m_nextBitPosInt; // Integer rounded up version to save on ops
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uint32_t m_nextBitPos_1024;
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uint32_t m_lastBitPos_1024;
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uint32_t m_shortestGoodTrans_1024;
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uint32_t m_minSymSamples_1024;
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uint32_t m_maxSymSamples_1024;
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uint32_t m_maxRunOfSameValue;
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bitset<(size_t)BIT_BUF_SIZE> m_bits;
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long m_bitsStart;
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long m_bitsEnd;
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DetectionMode m_detectionMode;
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FIFOStruct m_fifo;
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bool m_gotSync;
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int m_numCode;
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bool m_inverted;
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};
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#endif/*__EXTRACT_FRAME_PAGER_H__*/
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