47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
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#ifndef HDLC_AFSK_RX_H
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#define HDLC_AFSK_RX_H
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#include "hdlcFramesBuffer.h"
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#define STUF_NO_STUF 0
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#define STUF_SKIP 1
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#define STUF_SKIP_CHECKS 2
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#define RXST_IDLE 0
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#define RXST_SYNC1 1
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#define RXST_SYNC2 2
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#define RXST_START 3
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#define STUF1 0x7c
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#define STUF2 0x7d
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#define RX_AN_SAMPLE_COUNT 8
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#define MAX_RX_AN_SAMPLE_INDEX 7
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#define WINDOW_SAMPLE_COUNT 64
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#define HALF_WINDOW_SAMPLE_COUNT 32
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#define SPACE_MARK_TRANSISION_MASK 0x03
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class HdlcAfskRx {
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public:
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HdlcAfskRx(HdlcFrameBuffer* rxBuffer);
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void decodeSample(byte sampleVal);
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boolean receiving = false;
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private:
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HdlcFrameBuffer* _rxBuffer;
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int _rxFilter[2][2];
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int _rxAnSamples[RX_AN_SAMPLE_COUNT];
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int _rxAnSampleIndex = 0;
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int _histAnSampleIndex = 4;
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byte _spaceMarkSamples = 0x00;
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int _currentPhase = 0;
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boolean _prevSpace = false;
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boolean _currentSpace = false;
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byte _afskShiftInReg = 0x00;
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int stufState = STUF_NO_STUF;
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int _rxBitCount = 0;
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int _frameRxState = RXST_IDLE;
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void setNextMark(boolean spaceMark);
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};
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#endif
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