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https://github.com/RfidResearchGroup/proxmark3.git
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83 lines
4.6 KiB
C
83 lines
4.6 KiB
C
// Copyright (C) 2014
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Low frequency demod related commands
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// marshmellow
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// note that many of these demods are not the slickest code and they often rely
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// on peaks and clock instead of converting to clean signal.
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//
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//-----------------------------------------------------------------------------
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#ifndef LFDEMOD_H__
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#define LFDEMOD_H__
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#include "common.h"
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//might not be high enough for noisy environments
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#define NOISE_AMPLITUDE_THRESHOLD 8
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//ignore buffer with less than x samples
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#define SIGNAL_MIN_SAMPLES 100
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//ignore first x samples of the buffer
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#define SIGNAL_IGNORE_FIRST_SAMPLES 10
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//generic
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typedef struct {
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int low;
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int high;
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int mean;
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int amplitude;
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bool isnoise;
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} signal_t;
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signal_t *getSignalProperties(void);
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void computeSignalProperties(uint8_t *samples, uint32_t size);
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void removeSignalOffset(uint8_t *samples, uint32_t size);
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void getNextLow(uint8_t *samples, size_t size, int low, size_t *i);
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void getNextHigh(uint8_t *samples, size_t size, int high, size_t *i);
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bool loadWaveCounters(uint8_t *samples, size_t size, int lowToLowWaveLen[], int highToLowWaveLen[], int *waveCnt, int *skip, int *minClk, int *high, int *low);
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size_t pskFindFirstPhaseShift(uint8_t *samples, size_t size, uint8_t *curPhase, size_t waveStart, uint16_t fc, uint16_t *fullWaveLen);
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size_t addParity(uint8_t *src, uint8_t *dest, uint8_t sourceLen, uint8_t pLen, uint8_t pType);
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int askdemod(uint8_t *bits, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp, uint8_t askType);
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int askdemod_ext(uint8_t *bits, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp, uint8_t askType, int *startIdx);
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void askAmp(uint8_t *bits, size_t size);
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int BiphaseRawDecode(uint8_t *bits, size_t *size, int *offset, int invert);
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int bits_to_array(const uint8_t *bits, size_t size, uint8_t *dest);
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uint32_t bytebits_to_byte(uint8_t *src, size_t numbits);
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uint32_t bytebits_to_byteLSBF(uint8_t *src, size_t numbits);
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uint16_t countFC(uint8_t *bits, size_t size, bool fskAdj);
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int DetectASKClock(uint8_t *dest, size_t size, int *clock, int maxErr);
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bool DetectCleanAskWave(uint8_t *dest, size_t size, uint8_t high, uint8_t low);
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uint8_t detectFSKClk(uint8_t *bits, size_t size, uint8_t fcHigh, uint8_t fcLow, int *firstClockEdge);
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int DetectNRZClock(uint8_t *dest, size_t size, int clock, size_t *clockStartIdx);
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int DetectPSKClock(uint8_t *dest, size_t size, int clock, size_t *firstPhaseShift, uint8_t *curPhase, uint8_t *fc);
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int DetectStrongAskClock(uint8_t *dest, size_t size, int high, int low, int *clock);
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int DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int low, bool *strong);
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bool DetectST(uint8_t *buffer, size_t *size, int *foundclock, size_t *ststart, size_t *stend);
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size_t fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t fchigh, uint8_t fclow, int *start_idx);
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//void getHiLo(uint8_t *bits, size_t size, int *high, int *low, uint8_t fuzzHi, uint8_t fuzzLo);
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void getHiLo(int *high, int *low, uint8_t fuzzHi, uint8_t fuzzLo);
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uint32_t manchesterEncode2Bytes(uint16_t datain);
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void manchesterEncodeUint32(uint32_t data_in, uint8_t bitlen_in, uint8_t *bits_out, uint16_t *index);
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int ManchesterEncode(uint8_t *bits, size_t size);
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uint16_t manrawdecode(uint8_t *bits, size_t *size, uint8_t invert, uint8_t *alignPos);
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int nrzRawDemod(uint8_t *dest, size_t *size, int *clk, int *invert, int *startIdx);
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bool parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType);
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bool preambleSearch(uint8_t *bits, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx);
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bool preambleSearchEx(uint8_t *bits, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx, bool findone);
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int pskRawDemod(uint8_t *dest, size_t *size, int *clock, int *invert);
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int pskRawDemod_ext(uint8_t *dest, size_t *size, int *clock, int *invert, int *startIdx);
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void psk2TOpsk1(uint8_t *bits, size_t size);
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void psk1TOpsk2(uint8_t *bits, size_t size);
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size_t removeParity(uint8_t *bits, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen);
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//tag specific
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int detectAWID(uint8_t *dest, size_t *size, int *waveStartIdx);
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int Em410xDecode(uint8_t *bits, size_t *size, size_t *start_idx, uint32_t *hi, uint64_t *lo);
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int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo, int *waveStartIdx);
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int detectIOProx(uint8_t *dest, size_t *size, int *waveStartIdx);
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#endif
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