common/lfdemod.h

   1 // Copyright (C) 2014
   2 //
   3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   4 // at your option, any later version. See the LICENSE.txt file for the text of
   5 // the license.
   6 //-----------------------------------------------------------------------------
   7 // Low frequency demod related commands
   8 // marshmellow
   9 // note that many of these demods are not the slickest code and they often rely
  10 //   on peaks and clock instead of converting to clean signal.
  11 //
  12 //-----------------------------------------------------------------------------
  13
  14 #ifndef LFDEMOD_H__
  15 #define LFDEMOD_H__
  16
  17 #include "common.h"
  18
  19 //might not be high enough for noisy environments
  20 #define NOISE_AMPLITUDE_THRESHOLD 8
  21 //ignore buffer with less than x samples
  22 #define SIGNAL_MIN_SAMPLES 100
  23 //ignore first x samples of the buffer
  24 #define SIGNAL_IGNORE_FIRST_SAMPLES 10
  25
  26 //generic
  27 typedef struct {
  28     int low;
  29     int high;
  30     int mean;
  31     int amplitude;
  32     bool isnoise;
  33 } signal_t;
  34 signal_t *getSignalProperties(void);
  35
  36 void computeSignalProperties(uint8_t *samples, uint32_t size);
  37 void removeSignalOffset(uint8_t *samples, uint32_t size);
  38 void getNextLow(uint8_t *samples, size_t size, int low, size_t *i);
  39 void getNextHigh(uint8_t *samples, size_t size, int high, size_t *i);
  40 bool loadWaveCounters(uint8_t *samples, size_t size, int lowToLowWaveLen[], int highToLowWaveLen[], int *waveCnt, int *skip, int *minClk, int *high, int *low);
  41 size_t pskFindFirstPhaseShift(uint8_t *samples, size_t size, uint8_t *curPhase, size_t waveStart, uint16_t fc, uint16_t *fullWaveLen);
  42
  43 size_t   addParity(uint8_t *src, uint8_t *dest, uint8_t sourceLen, uint8_t pLen, uint8_t pType);
  44 int      askdemod(uint8_t *bits, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp, uint8_t askType);
  45 int      askdemod_ext(uint8_t *bits, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp, uint8_t askType, int *startIdx);
  46 void     askAmp(uint8_t *bits, size_t size);
  47 int      BiphaseRawDecode(uint8_t *bits, size_t *size, int *offset, int invert);
  48 int      bits_to_array(const uint8_t *bits, size_t size, uint8_t *dest);
  49 uint32_t bytebits_to_byte(uint8_t *src, size_t numbits);
  50 uint32_t bytebits_to_byteLSBF(uint8_t *src, size_t numbits);
  51 uint16_t countFC(uint8_t *bits, size_t size, bool fskAdj);
  52 int      DetectASKClock(uint8_t *dest, size_t size, int *clock, int maxErr);
  53 bool     DetectCleanAskWave(uint8_t *dest, size_t size, uint8_t high, uint8_t low);
  54 uint8_t  detectFSKClk(uint8_t *bits, size_t size, uint8_t fcHigh, uint8_t fcLow, int *firstClockEdge);
  55 int      DetectNRZClock(uint8_t *dest, size_t size, int clock, size_t *clockStartIdx);
  56 int      DetectPSKClock(uint8_t *dest, size_t size, int clock, size_t *firstPhaseShift, uint8_t *curPhase, uint8_t *fc);
  57 int      DetectStrongAskClock(uint8_t *dest, size_t size, int high, int low, int *clock);
  58 int      DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int low, bool *strong);
  59 bool     DetectST(uint8_t *buffer, size_t *size, int *foundclock, size_t *ststart, size_t *stend);
  60 size_t   fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t fchigh, uint8_t fclow, int *start_idx);
  61 //void     getHiLo(uint8_t *bits, size_t size, int *high, int *low, uint8_t fuzzHi, uint8_t fuzzLo);
  62 void     getHiLo(int *high, int *low, uint8_t fuzzHi, uint8_t fuzzLo);
  63 uint32_t manchesterEncode2Bytes(uint16_t datain);
  64 void     manchesterEncodeUint32(uint32_t data_in, uint8_t bitlen_in, uint8_t *bits_out, uint16_t *index);
  65 int      ManchesterEncode(uint8_t *bits, size_t size);
  66 uint16_t manrawdecode(uint8_t *bits, size_t *size, uint8_t invert, uint8_t *alignPos);
  67 int      nrzRawDemod(uint8_t *dest, size_t *size, int *clk, int *invert, int *startIdx);
  68 bool     parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType);
  69 bool     preambleSearch(uint8_t *bits, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx);
  70 bool     preambleSearchEx(uint8_t *bits, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx, bool findone);
  71 int      pskRawDemod(uint8_t *dest, size_t *size, int *clock, int *invert);
  72 int      pskRawDemod_ext(uint8_t *dest, size_t *size, int *clock, int *invert, int *startIdx);
  73 void     psk2TOpsk1(uint8_t *bits, size_t size);
  74 void     psk1TOpsk2(uint8_t *bits, size_t size);
  75 size_t   removeParity(uint8_t *bits, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen);
  76
  77 //tag specific
  78 int detectAWID(uint8_t *dest, size_t *size, int *waveStartIdx);
  79 int Em410xDecode(uint8_t *bits, size_t *size, size_t *start_idx, uint32_t *hi, uint64_t *lo);
  80 int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo, int *waveStartIdx);
  81 int detectIOProx(uint8_t *dest, size_t *size, int *waveStartIdx);
  82
  83 #endif