Documentation to apps.h, documentation/renaming to iclass

[proxmark3-svn] / client / cmddata.c

//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Data and Graph commands
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "proxmark3.h"
#include "data.h"
#include "ui.h"
#include "graph.h"
#include "cmdparser.h"
#include "util.h"
#include "cmdmain.h"
#include "cmddata.h"
#include "lfdemod.h"
uint8_t DemodBuffer[MAX_DEMOD_BUF_LEN];
int DemodBufferLen;
static int CmdHelp(const char *Cmd);

//set the demod buffer with given array of binary (one bit per byte)
//by marshmellow
void setDemodBuf(uint8_t *buff,int size)
{
        int i=0;
        for (; i < size; ++i){
                DemodBuffer[i]=buff[i];
        }
        DemodBufferLen=size;
        return;
}

//by marshmellow
void printDemodBuff()
{
        uint32_t i = 0;
        int bitLen = DemodBufferLen;
        if (bitLen<16) {
                PrintAndLog("no bits found in demod buffer");
                return;
        }
        if (bitLen>512) bitLen=512; //max output to 512 bits if we have more - should be plenty
        for (i = 0; i <= (bitLen-16); i+=16) {
                PrintAndLog("%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i",
                        DemodBuffer[i],
                        DemodBuffer[i+1],
                        DemodBuffer[i+2],
                        DemodBuffer[i+3],
                        DemodBuffer[i+4],
                        DemodBuffer[i+5],
                        DemodBuffer[i+6],
                        DemodBuffer[i+7],
                        DemodBuffer[i+8],
                        DemodBuffer[i+9],
                        DemodBuffer[i+10],
                        DemodBuffer[i+11],
                        DemodBuffer[i+12],
                        DemodBuffer[i+13],
                        DemodBuffer[i+14],
                        DemodBuffer[i+15]);
        }
        return;
}


int CmdAmp(const char *Cmd)
{
        int i, rising, falling;
        int max = INT_MIN, min = INT_MAX;

        for (i = 10; i < GraphTraceLen; ++i) {
                if (GraphBuffer[i] > max)
                        max = GraphBuffer[i];
                if (GraphBuffer[i] < min)
                        min = GraphBuffer[i];
        }

        if (max != min) {
                rising = falling= 0;
                for (i = 0; i < GraphTraceLen; ++i) {
                        if (GraphBuffer[i + 1] < GraphBuffer[i]) {
                                if (rising) {
                                        GraphBuffer[i] = max;
                                        rising = 0;
                                }
                                falling = 1;
                        }
                        if (GraphBuffer[i + 1] > GraphBuffer[i]) {
                                if (falling) {
                                        GraphBuffer[i] = min;
                                        falling = 0;
                                }
                                rising= 1;
                        }
                }
        }
        RepaintGraphWindow();
        return 0;
}

/*
 * Generic command to demodulate ASK.
 *
 * Argument is convention: positive or negative (High mod means zero
 * or high mod means one)
 *
 * Updates the Graph trace with 0/1 values
 *
 * Arguments:
 * c : 0 or 1
 */
 //this method is dependant on all highs and lows to be the same(or clipped)  this creates issues[marshmellow] it also ignores the clock
int Cmdaskdemod(const char *Cmd)
{
        int i;
        int c, high = 0, low = 0;

        // TODO: complain if we do not give 2 arguments here !
        // (AL - this doesn't make sense! we're only using one argument!!!)
        sscanf(Cmd, "%i", &c);

        /* Detect high and lows and clock */
        // (AL - clock???)
        for (i = 0; i < GraphTraceLen; ++i)
        {
                if (GraphBuffer[i] > high)
                        high = GraphBuffer[i];
                else if (GraphBuffer[i] < low)
                        low = GraphBuffer[i];
        }
        high=abs(high*.75);
        low=abs(low*.75);
        if (c != 0 && c != 1) {
                PrintAndLog("Invalid argument: %s", Cmd);
                return 0;
        }
        //prime loop
        if (GraphBuffer[0] > 0) {
                GraphBuffer[0] = 1-c;
        } else {
                GraphBuffer[0] = c;
        }
        for (i = 1; i < GraphTraceLen; ++i) {
                /* Transitions are detected at each peak
                 * Transitions are either:
                 * - we're low: transition if we hit a high
                 * - we're high: transition if we hit a low
                 * (we need to do it this way because some tags keep high or
                 * low for long periods, others just reach the peak and go
                 * down)
                 */
                //[marhsmellow] change == to >= for high and <= for low for fuzz
                if ((GraphBuffer[i] == high) && (GraphBuffer[i - 1] == c)) {
                        GraphBuffer[i] = 1 - c;
                } else if ((GraphBuffer[i] == low) && (GraphBuffer[i - 1] == (1 - c))){
                        GraphBuffer[i] = c;
                } else {
                        /* No transition */
                        GraphBuffer[i] = GraphBuffer[i - 1];
                }
        }
        RepaintGraphWindow();
        return 0;
}

//by marshmellow
void printBitStream(uint8_t BitStream[], uint32_t bitLen)
{
        uint32_t i = 0;
        if (bitLen<16) {
                PrintAndLog("Too few bits found: %d",bitLen);
                return;
        }
        if (bitLen>512) bitLen=512;
         for (i = 0; i <= (bitLen-16); i+=16) {
                PrintAndLog("%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i%i",
                        BitStream[i],
                        BitStream[i+1],
                        BitStream[i+2],
                        BitStream[i+3],
                        BitStream[i+4],
                        BitStream[i+5],
                        BitStream[i+6],
                        BitStream[i+7],
                        BitStream[i+8],
                        BitStream[i+9],
                        BitStream[i+10],
                        BitStream[i+11],
                        BitStream[i+12],
                        BitStream[i+13],
                        BitStream[i+14],
                        BitStream[i+15]);
        }
        return;
}
//by marshmellow
//print EM410x ID in multiple formats
void printEM410x(uint64_t id)
{
        if (id !=0){
                        uint64_t iii=1;
                        uint64_t id2lo=0; //id2hi=0,
                        uint32_t ii=0;
                        uint32_t i=0;
                        for (ii=5; ii>0;ii--){
                                for (i=0;i<8;i++){
                                        id2lo=(id2lo<<1LL) | ((id & (iii << (i+((ii-1)*8)))) >> (i+((ii-1)*8)));
                                }
                        }
                        //output em id
                        PrintAndLog("EM TAG ID    : %010llx", id);
                        PrintAndLog("Unique TAG ID: %010llx",  id2lo); //id2hi,
                        PrintAndLog("DEZ 8        : %08lld",id & 0xFFFFFF);
                        PrintAndLog("DEZ 10       : %010lld",id & 0xFFFFFF);
                        PrintAndLog("DEZ 5.5      : %05lld.%05lld",(id>>16LL) & 0xFFFF,(id & 0xFFFF));
                        PrintAndLog("DEZ 3.5A     : %03lld.%05lld",(id>>32ll),(id & 0xFFFF));
                        PrintAndLog("DEZ 14/IK2   : %014lld",id);
                        PrintAndLog("DEZ 15/IK3   : %015lld",id2lo);
                        PrintAndLog("Other        : %05lld_%03lld_%08lld",(id&0xFFFF),((id>>16LL) & 0xFF),(id & 0xFFFFFF));
                }
                return;
}

//by marshmellow
//take binary from demod buffer and see if we can find an EM410x ID
int CmdEm410xDecode(const char *Cmd)
{
        uint64_t id=0;
 // uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
 // uint32_t i=0;
 // i=getFromGraphBuf(BitStream);
        id = Em410xDecode(DemodBuffer,DemodBufferLen);
        printEM410x(id);
        if (id>0) return 1;
        return 0;
}


//by marshmellow
//takes 2 arguments - clock and invert both as integers
//attempts to demodulate ask while decoding manchester
//prints binary found and saves in graphbuffer for further commands
int Cmdaskmandemod(const char *Cmd)
{
        int invert=0;
        int clk=0;
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        sscanf(Cmd, "%i %i", &clk, &invert);
        if (invert != 0 && invert != 1) {
                PrintAndLog("Invalid argument: %s", Cmd);
                return 0;
        }

        size_t BitLen = getFromGraphBuf(BitStream);
        //  PrintAndLog("DEBUG: Bitlen from grphbuff: %d",BitLen);
        int errCnt=0;
         errCnt = askmandemod(BitStream, &BitLen,&clk,&invert);
        if (errCnt<0||BitLen<16){  //if fatal error (or -1)
                // PrintAndLog("no data found %d, errors:%d, bitlen:%d, clock:%d",errCnt,invert,BitLen,clk);
                return 0;
        }
        PrintAndLog("\nUsing Clock: %d - Invert: %d - Bits Found: %d",clk,invert,BitLen);

        //output
        if (errCnt>0){
                PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
        }
        PrintAndLog("ASK/Manchester decoded bitstream:");
        // Now output the bitstream to the scrollback by line of 16 bits
        setDemodBuf(BitStream,BitLen);
        printDemodBuff();
        uint64_t lo =0;
        lo = Em410xDecode(BitStream,BitLen);
        if (lo>0){
                //set GraphBuffer for clone or sim command
                PrintAndLog("EM410x pattern found: ");
                printEM410x(lo);
                return 1;
        }
        //if (BitLen>16) return 1;
        return 0;
}

//by marshmellow
//manchester decode
//stricktly take 10 and 01 and convert to 0 and 1
int Cmdmandecoderaw(const char *Cmd)
{
        int i =0;
        int errCnt=0;
        size_t size=0;
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        int high=0,low=0;
        for (;i<DemodBufferLen;++i){
                if (DemodBuffer[i]>high) high=DemodBuffer[i];
                else if(DemodBuffer[i]<low) low=DemodBuffer[i];
                BitStream[i]=DemodBuffer[i];
        }
        if (high>1 || low <0 ){
                PrintAndLog("Error: please raw demod the wave first then mancheseter raw decode");
                return 0;
        }
        size=i;
        errCnt=manrawdecode(BitStream, &size);
        if (errCnt>=20){
                PrintAndLog("Too many errors: %d",errCnt);
                return 0;
        }
        PrintAndLog("Manchester Decoded - # errors:%d - data:",errCnt);
        printBitStream(BitStream, size);
        if (errCnt==0){
                uint64_t id = 0;
                id = Em410xDecode(BitStream, size);
                if (id>0) setDemodBuf(BitStream, size);
                printEM410x(id);
        }
        return 1;
}

//by marshmellow
//biphase decode
//take 01 or 10 = 0 and 11 or 00 = 1
//takes 1 argument "offset" default = 0 if 1 it will shift the decode by one bit
//  since it is not like manchester and doesn't have an incorrect bit pattern we
//  cannot determine if our decode is correct or if it should be shifted by one bit
//  the argument offset allows us to manually shift if the output is incorrect
//  (better would be to demod and decode at the same time so we can distinguish large
//    width waves vs small width waves to help the decode positioning) or askbiphdemod
int CmdBiphaseDecodeRaw(const char *Cmd)
{
        int i = 0;
        int errCnt=0;
        size_t size=0;
        int offset=0;
        int high=0, low=0;
        sscanf(Cmd, "%i", &offset);
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        //get graphbuffer & high and low
        for (;i<DemodBufferLen;++i){
                if(DemodBuffer[i]>high)high=DemodBuffer[i];
                else if(DemodBuffer[i]<low)low=DemodBuffer[i];
                BitStream[i]=DemodBuffer[i];
        }
        if (high>1 || low <0){
                PrintAndLog("Error: please raw demod the wave first then decode");
                return 0;
        }
        size=i;
        errCnt=BiphaseRawDecode(BitStream, &size, offset);
        if (errCnt>=20){
                PrintAndLog("Too many errors attempting to decode: %d",errCnt);
                return 0;
        }
        PrintAndLog("Biphase Decoded using offset: %d - # errors:%d - data:",offset,errCnt);
        printBitStream(BitStream, size);
        PrintAndLog("\nif bitstream does not look right try offset=1");
        return 1;
}


//by marshmellow
//takes 2 arguments - clock and invert both as integers
//attempts to demodulate ask only
//prints binary found and saves in graphbuffer for further commands
int Cmdaskrawdemod(const char *Cmd)
{
        int invert=0;
        int clk=0;
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        sscanf(Cmd, "%i %i", &clk, &invert);
        if (invert != 0 && invert != 1) {
                PrintAndLog("Invalid argument: %s", Cmd);
                return 0;
        }
        size_t BitLen = getFromGraphBuf(BitStream);
        int errCnt=0;
        errCnt = askrawdemod(BitStream, &BitLen,&clk,&invert);
        if (errCnt==-1||BitLen<16){  //throw away static - allow 1 and -1 (in case of threshold command first)
                PrintAndLog("no data found");
                return 0;
        }
        PrintAndLog("Using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
                //PrintAndLog("Data start pos:%d, lastBit:%d, stop pos:%d, numBits:%d",iii,lastBit,i,bitnum);
                //move BitStream back to DemodBuffer
        setDemodBuf(BitStream,BitLen);

                //output
        if (errCnt>0){
                PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
        }
        PrintAndLog("ASK demoded bitstream:");
        // Now output the bitstream to the scrollback by line of 16 bits
        printBitStream(BitStream,BitLen);

        return 1;
}

int CmdAutoCorr(const char *Cmd)
{
        static int CorrelBuffer[MAX_GRAPH_TRACE_LEN];

        int window = atoi(Cmd);

        if (window == 0) {
                PrintAndLog("needs a window");
                return 0;
        }
        if (window >= GraphTraceLen) {
                PrintAndLog("window must be smaller than trace (%d samples)",
                        GraphTraceLen);
                return 0;
        }

        PrintAndLog("performing %d correlations", GraphTraceLen - window);

        for (int i = 0; i < GraphTraceLen - window; ++i) {
                int sum = 0;
                for (int j = 0; j < window; ++j) {
                        sum += (GraphBuffer[j]*GraphBuffer[i + j]) / 256;
                }
                CorrelBuffer[i] = sum;
        }
        GraphTraceLen = GraphTraceLen - window;
        memcpy(GraphBuffer, CorrelBuffer, GraphTraceLen * sizeof (int));

        RepaintGraphWindow();
        return 0;
}

int CmdBitsamples(const char *Cmd)
{
        int cnt = 0;
        uint8_t got[12288];

        GetFromBigBuf(got,sizeof(got),0);
        WaitForResponse(CMD_ACK,NULL);

                for (int j = 0; j < sizeof(got); j++) {
                        for (int k = 0; k < 8; k++) {
                                if(got[j] & (1 << (7 - k))) {
                                        GraphBuffer[cnt++] = 1;
                                } else {
                                        GraphBuffer[cnt++] = 0;
                                }
                        }
        }
        GraphTraceLen = cnt;
        RepaintGraphWindow();
        return 0;
}

/*
 * Convert to a bitstream
 */
int CmdBitstream(const char *Cmd)
{
        int i, j;
        int bit;
        int gtl;
        int clock;
        int low = 0;
        int high = 0;
        int hithigh, hitlow, first;

        /* Detect high and lows and clock */
        for (i = 0; i < GraphTraceLen; ++i)
        {
                if (GraphBuffer[i] > high)
                        high = GraphBuffer[i];
                else if (GraphBuffer[i] < low)
                        low = GraphBuffer[i];
        }

        /* Get our clock */
        clock = GetClock(Cmd, high, 1);
        gtl = ClearGraph(0);

        bit = 0;
        for (i = 0; i < (int)(gtl / clock); ++i)
        {
                hithigh = 0;
                hitlow = 0;
                first = 1;
                /* Find out if we hit both high and low peaks */
                for (j = 0; j < clock; ++j)
                {
                        if (GraphBuffer[(i * clock) + j] == high)
                                hithigh = 1;
                        else if (GraphBuffer[(i * clock) + j] == low)
                                hitlow = 1;
                        /* it doesn't count if it's the first part of our read
                                 because it's really just trailing from the last sequence */
                        if (first && (hithigh || hitlow))
                                hithigh = hitlow = 0;
                        else
                                first = 0;

                        if (hithigh && hitlow)
                                break;
                }

                /* If we didn't hit both high and low peaks, we had a bit transition */
                if (!hithigh || !hitlow)
                        bit ^= 1;

                AppendGraph(0, clock, bit);
        //    for (j = 0; j < (int)(clock/2); j++)
        //      GraphBuffer[(i * clock) + j] = bit ^ 1;
        //    for (j = (int)(clock/2); j < clock; j++)
        //      GraphBuffer[(i * clock) + j] = bit;
        }

        RepaintGraphWindow();
        return 0;
}

int CmdBuffClear(const char *Cmd)
{
        UsbCommand c = {CMD_BUFF_CLEAR};
        SendCommand(&c);
        ClearGraph(true);
        return 0;
}

int CmdDec(const char *Cmd)
{
        for (int i = 0; i < (GraphTraceLen / 2); ++i)
                GraphBuffer[i] = GraphBuffer[i * 2];
        GraphTraceLen /= 2;
        PrintAndLog("decimated by 2");
        RepaintGraphWindow();
        return 0;
}

/* Print our clock rate */
// uses data from graphbuffer
int CmdDetectClockRate(const char *Cmd)
{
        GetClock("",0,0);
        //int clock = DetectASKClock(0);
        //PrintAndLog("Auto-detected clock rate: %d", clock);
        return 0;
}

//by marshmellow
//fsk raw demod and print binary
//takes 4 arguments - Clock, invert, rchigh, rclow
//defaults: clock = 50, invert=0, rchigh=10, rclow=8 (RF/10 RF/8 (fsk2a))
int CmdFSKrawdemod(const char *Cmd)
{
        //raw fsk demod  no manchester decoding no start bit finding just get binary from wave
        //set defaults
        int rfLen = 50;
        int invert=0;
        int fchigh=10;
        int fclow=8;
        //set options from parameters entered with the command
        sscanf(Cmd, "%i %i %i %i", &rfLen, &invert, &fchigh, &fclow);

        if (strlen(Cmd)>0 && strlen(Cmd)<=2) {
                 //rfLen=param_get8(Cmd, 0); //if rfLen option only is used
                 if (rfLen==1){
                        invert=1;   //if invert option only is used
                        rfLen = 50;
                 } else if(rfLen==0) rfLen=50;
        }
        PrintAndLog("Args invert: %d - Clock:%d - fchigh:%d - fclow: %d",invert,rfLen,fchigh, fclow);
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        int size  = fskdemod(BitStream,BitLen,(uint8_t)rfLen,(uint8_t)invert,(uint8_t)fchigh,(uint8_t)fclow);
        if (size>0){
                PrintAndLog("FSK decoded bitstream:");
                setDemodBuf(BitStream,size);

                // Now output the bitstream to the scrollback by line of 16 bits
                if(size > (8*32)+2) size = (8*32)+2; //only output a max of 8 blocks of 32 bits  most tags will have full bit stream inside that sample size
                printBitStream(BitStream,size);
        } else{
                PrintAndLog("no FSK data found");
        }
        return 0;
}

//by marshmellow (based on existing demod + holiman's refactor)
//HID Prox demod - FSK RF/50 with preamble of 00011101 (then manchester encoded)
//print full HID Prox ID and some bit format details if found
int CmdFSKdemodHID(const char *Cmd)
{
        //raw fsk demod no manchester decoding no start bit finding just get binary from wave
        uint32_t hi2=0, hi=0, lo=0;

        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        //get binary from fsk wave
        size_t size  = HIDdemodFSK(BitStream,BitLen,&hi2,&hi,&lo);
        if (size<0){
                PrintAndLog("Error demoding fsk");
                return 0;
        }
        if (hi2==0 && hi==0 && lo==0) return 0;
        if (hi2 != 0){ //extra large HID tags
                PrintAndLog("HID Prox TAG ID: %x%08x%08x (%d)",
                         (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
                setDemodBuf(BitStream,BitLen);
                return 1;
        }
        else {  //standard HID tags <38 bits
                //Dbprintf("TAG ID: %x%08x (%d)",(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF); //old print cmd
                uint8_t fmtLen = 0;
                uint32_t fc = 0;
                uint32_t cardnum = 0;
                if (((hi>>5)&1)==1){//if bit 38 is set then < 37 bit format is used
                        uint32_t lo2=0;
                        lo2=(((hi & 15) << 12) | (lo>>20)); //get bits 21-37 to check for format len bit
                        uint8_t idx3 = 1;
                        while(lo2>1){ //find last bit set to 1 (format len bit)
                                lo2=lo2>>1;
                                idx3++;
                        }
                        fmtLen =idx3+19;
                        fc =0;
                        cardnum=0;
                        if(fmtLen==26){
                                cardnum = (lo>>1)&0xFFFF;
                                fc = (lo>>17)&0xFF;
                        }
                        if(fmtLen==37){
                                cardnum = (lo>>1)&0x7FFFF;
                                fc = ((hi&0xF)<<12)|(lo>>20);
                        }
                        if(fmtLen==34){
                                cardnum = (lo>>1)&0xFFFF;
                                fc= ((hi&1)<<15)|(lo>>17);
                        }
                        if(fmtLen==35){
                                cardnum = (lo>>1)&0xFFFFF;
                                fc = ((hi&1)<<11)|(lo>>21);
                        }
                }
                else { //if bit 38 is not set then 37 bit format is used
                        fmtLen= 37;
                        fc =0;
                        cardnum=0;
                        if(fmtLen==37){
                                cardnum = (lo>>1)&0x7FFFF;
                                fc = ((hi&0xF)<<12)|(lo>>20);
                        }
                }
                PrintAndLog("HID Prox TAG ID: %x%08x (%d) - Format Len: %dbit - FC: %d - Card: %d",
                        (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF,
                        (unsigned int) fmtLen, (unsigned int) fc, (unsigned int) cardnum);
                setDemodBuf(BitStream,BitLen);
                return 1;
        }
        return 0;
}

//by marshmellow
//IO-Prox demod - FSK RF/64 with preamble of 000000001
//print ioprox ID and some format details
int CmdFSKdemodIO(const char *Cmd)
{
        //raw fsk demod no manchester decoding no start bit finding just get binary from wave
        //set defaults
        int idx=0;
        //something in graphbuffer
        if (GraphTraceLen < 65) return 0;
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        //get binary from fsk wave
        // PrintAndLog("DEBUG: got buff");
        idx = IOdemodFSK(BitStream,BitLen);
        if (idx<0){
                //PrintAndLog("Error demoding fsk");
                return 0;
        }
        // PrintAndLog("DEBUG: Got IOdemodFSK");
        if (idx==0){
                //PrintAndLog("IO Prox Data not found - FSK Data:");
                //if (BitLen > 92) printBitStream(BitStream,92);
                return 0;
        }
                //Index map
                //0           10          20          30          40          50          60
                //|           |           |           |           |           |           |
                //01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
                //-----------------------------------------------------------------------------
                //00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
                //
                //XSF(version)facility:codeone+codetwo (raw)
                //Handle the data
        if (idx+64>BitLen) return 0;
        PrintAndLog("%d%d%d%d%d%d%d%d %d",BitStream[idx],    BitStream[idx+1],  BitStream[idx+2], BitStream[idx+3], BitStream[idx+4], BitStream[idx+5], BitStream[idx+6], BitStream[idx+7], BitStream[idx+8]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d",BitStream[idx+9],  BitStream[idx+10], BitStream[idx+11],BitStream[idx+12],BitStream[idx+13],BitStream[idx+14],BitStream[idx+15],BitStream[idx+16],BitStream[idx+17]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d facility",BitStream[idx+18], BitStream[idx+19], BitStream[idx+20],BitStream[idx+21],BitStream[idx+22],BitStream[idx+23],BitStream[idx+24],BitStream[idx+25],BitStream[idx+26]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d version",BitStream[idx+27], BitStream[idx+28], BitStream[idx+29],BitStream[idx+30],BitStream[idx+31],BitStream[idx+32],BitStream[idx+33],BitStream[idx+34],BitStream[idx+35]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d code1",BitStream[idx+36], BitStream[idx+37], BitStream[idx+38],BitStream[idx+39],BitStream[idx+40],BitStream[idx+41],BitStream[idx+42],BitStream[idx+43],BitStream[idx+44]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d code2",BitStream[idx+45], BitStream[idx+46], BitStream[idx+47],BitStream[idx+48],BitStream[idx+49],BitStream[idx+50],BitStream[idx+51],BitStream[idx+52],BitStream[idx+53]);
        PrintAndLog("%d%d%d%d%d%d%d%d %d%d checksum",BitStream[idx+54],BitStream[idx+55],BitStream[idx+56],BitStream[idx+57],BitStream[idx+58],BitStream[idx+59],BitStream[idx+60],BitStream[idx+61],BitStream[idx+62],BitStream[idx+63]);

        uint32_t code = bytebits_to_byte(BitStream+idx,32);
        uint32_t code2 = bytebits_to_byte(BitStream+idx+32,32);
        uint8_t version = bytebits_to_byte(BitStream+idx+27,8); //14,4
        uint8_t facilitycode = bytebits_to_byte(BitStream+idx+18,8) ;
        uint16_t number = (bytebits_to_byte(BitStream+idx+36,8)<<8)|(bytebits_to_byte(BitStream+idx+45,8)); //36,9
        PrintAndLog("IO Prox XSF(%02d)%02x:%05d (%08x%08x)",version,facilitycode,number,code,code2);
        int i;
        for (i=0;i<64;++i)
                DemodBuffer[i]=BitStream[idx++];

        DemodBufferLen=64;
        return 1;
}
int CmdFSKdemod(const char *Cmd) //old CmdFSKdemod needs updating
{
        static const int LowTone[]  = {
                1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
                1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
                1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
                1,  1,  1,  1,  1, -1, -1, -1, -1, -1,
                1,  1,  1,  1,  1, -1, -1, -1, -1, -1
        };
        static const int HighTone[] = {
                1,  1,  1,  1,  1,     -1, -1, -1, -1,
                1,  1,  1,  1,         -1, -1, -1, -1,
                1,  1,  1,  1,         -1, -1, -1, -1,
                1,  1,  1,  1,         -1, -1, -1, -1,
                1,  1,  1,  1,         -1, -1, -1, -1,
                1,  1,  1,  1,     -1, -1, -1, -1, -1,
        };

        int lowLen = sizeof (LowTone) / sizeof (int);
        int highLen = sizeof (HighTone) / sizeof (int);
        int convLen = (highLen > lowLen) ? highLen : lowLen; //if highlen > lowLen then highlen else lowlen
        uint32_t hi = 0, lo = 0;

        int i, j;
        int minMark = 0, maxMark = 0;

        for (i = 0; i < GraphTraceLen - convLen; ++i) {
                int lowSum = 0, highSum = 0;

                for (j = 0; j < lowLen; ++j) {
                        lowSum += LowTone[j]*GraphBuffer[i+j];
                }
                for (j = 0; j < highLen; ++j) {
                        highSum += HighTone[j] * GraphBuffer[i + j];
                }
                lowSum = abs(100 * lowSum / lowLen);
                highSum = abs(100 * highSum / highLen);
                GraphBuffer[i] = (highSum << 16) | lowSum;
        }

        for(i = 0; i < GraphTraceLen - convLen - 16; ++i) {
                int lowTot = 0, highTot = 0;
                // 10 and 8 are f_s divided by f_l and f_h, rounded
                for (j = 0; j < 10; ++j) {
                        lowTot += (GraphBuffer[i+j] & 0xffff);
                }
                for (j = 0; j < 8; j++) {
                        highTot += (GraphBuffer[i + j] >> 16);
                }
                GraphBuffer[i] = lowTot - highTot;
                if (GraphBuffer[i] > maxMark) maxMark = GraphBuffer[i];
                if (GraphBuffer[i] < minMark) minMark = GraphBuffer[i];
        }

        GraphTraceLen -= (convLen + 16);
        RepaintGraphWindow();

        // Find bit-sync (3 lo followed by 3 high) (HID ONLY)
        int max = 0, maxPos = 0;
        for (i = 0; i < 6000; ++i) {
                int dec = 0;
                for (j = 0; j < 3 * lowLen; ++j) {
                        dec -= GraphBuffer[i + j];
                }
                for (; j < 3 * (lowLen + highLen ); ++j) {
                        dec += GraphBuffer[i + j];
                }
                if (dec > max) {
                        max = dec;
                        maxPos = i;
                }
        }

        // place start of bit sync marker in graph
        GraphBuffer[maxPos] = maxMark;
        GraphBuffer[maxPos + 1] = minMark;

        maxPos += j;

        // place end of bit sync marker in graph
        GraphBuffer[maxPos] = maxMark;
        GraphBuffer[maxPos+1] = minMark;

        PrintAndLog("actual data bits start at sample %d", maxPos);
        PrintAndLog("length %d/%d", highLen, lowLen);

        uint8_t bits[46];
        bits[sizeof(bits)-1] = '\0';

        // find bit pairs and manchester decode them
        for (i = 0; i < arraylen(bits) - 1; ++i) {
                int dec = 0;
                for (j = 0; j < lowLen; ++j) {
                        dec -= GraphBuffer[maxPos + j];
                }
                for (; j < lowLen + highLen; ++j) {
                        dec += GraphBuffer[maxPos + j];
                }
                maxPos += j;
                // place inter bit marker in graph
                GraphBuffer[maxPos] = maxMark;
                GraphBuffer[maxPos + 1] = minMark;

                // hi and lo form a 64 bit pair
                hi = (hi << 1) | (lo >> 31);
                lo = (lo << 1);
                // store decoded bit as binary (in hi/lo) and text (in bits[])
                if(dec < 0) {
                        bits[i] = '1';
                        lo |= 1;
                } else {
                        bits[i] = '0';
                }
        }
        PrintAndLog("bits: '%s'", bits);
        PrintAndLog("hex: %08x %08x", hi, lo);
        return 0;
}

int CmdDetectNRZpskClockRate(const char *Cmd)
{
        GetNRZpskClock("",0,0);
        return 0;
}

int PSKnrzDemod(const char *Cmd){
        int invert=0;
        int clk=0;
        sscanf(Cmd, "%i %i", &clk, &invert);
        if (invert != 0 && invert != 1) {
                PrintAndLog("Invalid argument: %s", Cmd);
                return -1;
        }
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t BitLen = getFromGraphBuf(BitStream);
        int errCnt=0;
        errCnt = pskNRZrawDemod(BitStream, &BitLen,&clk,&invert);
        if (errCnt<0|| BitLen<16){  //throw away static - allow 1 and -1 (in case of threshold command first)
                //PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
                return -1;
        }
        PrintAndLog("Tried PSK/NRZ Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);

        //prime demod buffer for output
        setDemodBuf(BitStream,BitLen);
        return errCnt;
}
// Indala 26 bit decode
// by marshmellow
// optional arguments - same as CmdpskNRZrawDemod (clock & invert)
int CmdIndalaDecode(const char *Cmd)
{

        int ans=PSKnrzDemod(Cmd);
        if (ans < 0){
                PrintAndLog("Error1: %d",ans);
                return 0;
        }
        uint8_t invert=0;
        ans = indala26decode(DemodBuffer,(size_t *) &DemodBufferLen, &invert);
        if (ans < 1) {
                PrintAndLog("Error2: %d",ans);
                return -1;
        }
        char showbits[251];
        if(invert==1) PrintAndLog("Had to invert bits");
        //convert UID to HEX
        uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
        int idx;
        uid1=0;
        uid2=0;
        PrintAndLog("BitLen: %d",DemodBufferLen);
        if (DemodBufferLen==64){
                for( idx=0; idx<64; idx++) {
                        uid1=(uid1<<1)|(uid2>>31);
                        if (DemodBuffer[idx] == 0) {
                                uid2=(uid2<<1)|0;
                                showbits[idx]='0';
                        } else {
                                uid2=(uid2<<1)|1;
                                showbits[idx]='1';
                        }
                }
                showbits[idx]='\0';
                PrintAndLog("Indala UID=%s (%x%08x)", showbits, uid1, uid2);
        }
        else {
                uid3=0;
                uid4=0;
                uid5=0;
                uid6=0;
                uid7=0;
                for( idx=0; idx<DemodBufferLen; idx++) {
                        uid1=(uid1<<1)|(uid2>>31);
                        uid2=(uid2<<1)|(uid3>>31);
                        uid3=(uid3<<1)|(uid4>>31);
                        uid4=(uid4<<1)|(uid5>>31);
                        uid5=(uid5<<1)|(uid6>>31);
                        uid6=(uid6<<1)|(uid7>>31);
                        if (DemodBuffer[idx] == 0) {
                                uid7=(uid7<<1)|0;
                                showbits[idx]='0';
                        }
                        else {
                                uid7=(uid7<<1)|1;
                                showbits[idx]='1';
                        }
                }
                showbits[idx]='\0';
                PrintAndLog("Indala UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
        }
        return 1;
}

int CmdPskClean(const char *Cmd)
{
        uint8_t bitStream[MAX_GRAPH_TRACE_LEN]={0};
        size_t bitLen = getFromGraphBuf(bitStream);
        pskCleanWave(bitStream, bitLen);
        setGraphBuf(bitStream, bitLen);
        return 0;
}

//by marshmellow
//takes 2 arguments - clock and invert both as integers
//attempts to demodulate ask only
//prints binary found and saves in graphbuffer for further commands
int CmdpskNRZrawDemod(const char *Cmd)
{
        int errCnt= PSKnrzDemod(Cmd);
        //output
        if (errCnt<0) return 0;
        if (errCnt>0){
                PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
        }
        PrintAndLog("PSK or NRZ demoded bitstream:");
        // Now output the bitstream to the scrollback by line of 16 bits
        printDemodBuff();

        return 1;
}

int CmdGrid(const char *Cmd)
{
        sscanf(Cmd, "%i %i", &PlotGridX, &PlotGridY);
        PlotGridXdefault= PlotGridX;
        PlotGridYdefault= PlotGridY;
        RepaintGraphWindow();
        return 0;
}

int CmdHexsamples(const char *Cmd)
{
        int i, j;
        int requested = 0;
        int offset = 0;
        char string_buf[25];
        char* string_ptr = string_buf;
        uint8_t got[40000];

        sscanf(Cmd, "%i %i", &requested, &offset);

        /* if no args send something */
        if (requested == 0) {
                requested = 8;
        }
        if (offset + requested > sizeof(got)) {
                PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 40000");
                return 0;
        }

        GetFromBigBuf(got,requested,offset);
        WaitForResponse(CMD_ACK,NULL);

        i = 0;
        for (j = 0; j < requested; j++) {
                i++;
                string_ptr += sprintf(string_ptr, "%02x ", got[j]);
                if (i == 8) {
                        *(string_ptr - 1) = '\0';    // remove the trailing space
                        PrintAndLog("%s", string_buf);
                        string_buf[0] = '\0';
                        string_ptr = string_buf;
                        i = 0;
                }
                if (j == requested - 1 && string_buf[0] != '\0') { // print any remaining bytes
                        *(string_ptr - 1) = '\0';
                        PrintAndLog("%s", string_buf);
                        string_buf[0] = '\0';
                }
        }
        return 0;
}

int CmdHide(const char *Cmd)
{
        HideGraphWindow();
        return 0;
}

int CmdHpf(const char *Cmd)
{
        int i;
        int accum = 0;

        for (i = 10; i < GraphTraceLen; ++i)
                accum += GraphBuffer[i];
        accum /= (GraphTraceLen - 10);
        for (i = 0; i < GraphTraceLen; ++i)
                GraphBuffer[i] -= accum;

        RepaintGraphWindow();
        return 0;
}

int CmdSamples(const char *Cmd)
{
        uint8_t got[40000];

        int n = strtol(Cmd, NULL, 0);
        if (n == 0)
                n = 20000;

        if (n > sizeof(got))
                n = sizeof(got);

        PrintAndLog("Reading %d samples from device memory\n", n);
        GetFromBigBuf(got,n,0);
        WaitForResponse(CMD_ACK,NULL);
        for (int j = 0; j < n; j++) {
                GraphBuffer[j] = ((int)got[j]) - 128;
        }
        GraphTraceLen = n;
        RepaintGraphWindow();
        return 0;
}

int CmdTuneSamples(const char *Cmd)
{
        int timeout = 0;
        printf("\nMeasuring antenna characteristics, please wait...");

        UsbCommand c = {CMD_MEASURE_ANTENNA_TUNING};
        SendCommand(&c);

        UsbCommand resp;
        while(!WaitForResponseTimeout(CMD_MEASURED_ANTENNA_TUNING,&resp,1000)) {
                timeout++;
                printf(".");
                if (timeout > 7) {
                        PrintAndLog("\nNo response from Proxmark. Aborting...");
                        return 1;
                }
        }

        int peakv, peakf;
        int vLf125, vLf134, vHf;
        vLf125 = resp.arg[0] & 0xffff;
        vLf134 = resp.arg[0] >> 16;
        vHf = resp.arg[1] & 0xffff;;
        peakf = resp.arg[2] & 0xffff;
        peakv = resp.arg[2] >> 16;
        PrintAndLog("");
        PrintAndLog("# LF antenna: %5.2f V @   125.00 kHz", vLf125/1000.0);
        PrintAndLog("# LF antenna: %5.2f V @   134.00 kHz", vLf134/1000.0);
        PrintAndLog("# LF optimal: %5.2f V @%9.2f kHz", peakv/1000.0, 12000.0/(peakf+1));
        PrintAndLog("# HF antenna: %5.2f V @    13.56 MHz", vHf/1000.0);
        if (peakv<2000)
                PrintAndLog("# Your LF antenna is unusable.");
        else if (peakv<10000)
                PrintAndLog("# Your LF antenna is marginal.");
        if (vHf<2000)
                PrintAndLog("# Your HF antenna is unusable.");
        else if (vHf<5000)
                PrintAndLog("# Your HF antenna is marginal.");

        for (int i = 0; i < 256; i++) {
                GraphBuffer[i] = resp.d.asBytes[i] - 128;
        }

        PrintAndLog("Done! Divisor 89 is 134khz, 95 is 125khz.\n");
        PrintAndLog("\n");
        GraphTraceLen = 256;
        ShowGraphWindow();

  return 0;
}


int CmdLoad(const char *Cmd)
{
        FILE *f = fopen(Cmd, "r");
        if (!f) {
                PrintAndLog("couldn't open '%s'", Cmd);
                return 0;
        }

        GraphTraceLen = 0;
        char line[80];
        while (fgets(line, sizeof (line), f)) {
                GraphBuffer[GraphTraceLen] = atoi(line);
                GraphTraceLen++;
        }
        fclose(f);
        PrintAndLog("loaded %d samples", GraphTraceLen);
        RepaintGraphWindow();
        return 0;
}

int CmdLtrim(const char *Cmd)
{
        int ds = atoi(Cmd);

        for (int i = ds; i < GraphTraceLen; ++i)
                GraphBuffer[i-ds] = GraphBuffer[i];
        GraphTraceLen -= ds;

        RepaintGraphWindow();
        return 0;
}
int CmdRtrim(const char *Cmd)
{
        int ds = atoi(Cmd);

        GraphTraceLen = ds;

        RepaintGraphWindow();
        return 0;
}

/*
 * Manchester demodulate a bitstream. The bitstream needs to be already in
 * the GraphBuffer as 0 and 1 values
 *
 * Give the clock rate as argument in order to help the sync - the algorithm
 * resyncs at each pulse anyway.
 *
 * Not optimized by any means, this is the 1st time I'm writing this type of
 * routine, feel free to improve...
 *
 * 1st argument: clock rate (as number of samples per clock rate)
 *               Typical values can be 64, 32, 128...
 */
int CmdManchesterDemod(const char *Cmd)
{
        int i, j, invert= 0;
        int bit;
        int clock;
        int lastval = 0;
        int low = 0;
        int high = 0;
        int hithigh, hitlow, first;
        int lc = 0;
        int bitidx = 0;
        int bit2idx = 0;
        int warnings = 0;

        /* check if we're inverting output */
        if (*Cmd == 'i')
        {
                PrintAndLog("Inverting output");
                invert = 1;
                ++Cmd;
                do
                        ++Cmd;
                while(*Cmd == ' '); // in case a 2nd argument was given
        }

        /* Holds the decoded bitstream: each clock period contains 2 bits       */
        /* later simplified to 1 bit after manchester decoding.                 */
        /* Add 10 bits to allow for noisy / uncertain traces without aborting   */
        /* int BitStream[GraphTraceLen*2/clock+10]; */

        /* But it does not work if compiling on WIndows: therefore we just allocate a */
        /* large array */
        uint8_t BitStream[MAX_GRAPH_TRACE_LEN] = {0};

        /* Detect high and lows */
        for (i = 0; i < GraphTraceLen; i++)
        {
                if (GraphBuffer[i] > high)
                        high = GraphBuffer[i];
                else if (GraphBuffer[i] < low)
                        low = GraphBuffer[i];
        }

        /* Get our clock */
        clock = GetClock(Cmd, high, 1);

        int tolerance = clock/4;

        /* Detect first transition */
        /* Lo-Hi (arbitrary)       */
        /* skip to the first high */
        for (i= 0; i < GraphTraceLen; i++)
                if (GraphBuffer[i] == high)
                        break;
        /* now look for the first low */
        for (; i < GraphTraceLen; i++)
        {
                if (GraphBuffer[i] == low)
                {
                        lastval = i;
                        break;
                }
        }

        /* If we're not working with 1/0s, demod based off clock */
        if (high != 1)
        {
                bit = 0; /* We assume the 1st bit is zero, it may not be
                                                        * the case: this routine (I think) has an init problem.
                                                        * Ed.
                                                        */
                for (; i < (int)(GraphTraceLen / clock); i++)
                {
                        hithigh = 0;
                        hitlow = 0;
                        first = 1;

                        /* Find out if we hit both high and low peaks */
                        for (j = 0; j < clock; j++)
                        {
                                if (GraphBuffer[(i * clock) + j] == high)
                                        hithigh = 1;
                                else if (GraphBuffer[(i * clock) + j] == low)
                                        hitlow = 1;

                                /* it doesn't count if it's the first part of our read
                                         because it's really just trailing from the last sequence */
                                if (first && (hithigh || hitlow))
                                        hithigh = hitlow = 0;
                                else
                                        first = 0;

                                if (hithigh && hitlow)
                                        break;
                        }

                        /* If we didn't hit both high and low peaks, we had a bit transition */
                        if (!hithigh || !hitlow)
                                bit ^= 1;

                        BitStream[bit2idx++] = bit ^ invert;
                }
        }

        /* standard 1/0 bitstream */
        else
        {

                /* Then detect duration between 2 successive transitions */
                for (bitidx = 1; i < GraphTraceLen; i++)
                {
                        if (GraphBuffer[i-1] != GraphBuffer[i])
                        {
                                lc = i-lastval;
                                lastval = i;

                                // Error check: if bitidx becomes too large, we do not
                                // have a Manchester encoded bitstream or the clock is really
                                // wrong!
                                if (bitidx > (GraphTraceLen*2/clock+8) ) {
                                        PrintAndLog("Error: the clock you gave is probably wrong, aborting.");
                                        return 0;
                                }
                                // Then switch depending on lc length:
                                // Tolerance is 1/4 of clock rate (arbitrary)
                                if (abs(lc-clock/2) < tolerance) {
                                        // Short pulse : either "1" or "0"
                                        BitStream[bitidx++]=GraphBuffer[i-1];
                                } else if (abs(lc-clock) < tolerance) {
                                        // Long pulse: either "11" or "00"
                                        BitStream[bitidx++]=GraphBuffer[i-1];
                                        BitStream[bitidx++]=GraphBuffer[i-1];
                                } else {
                                // Error
                                        warnings++;
                                        PrintAndLog("Warning: Manchester decode error for pulse width detection.");
                                        PrintAndLog("(too many of those messages mean either the stream is not Manchester encoded, or clock is wrong)");

                                        if (warnings > 10)
                                        {
                                                PrintAndLog("Error: too many detection errors, aborting.");
                                                return 0;
                                        }
                                }
                        }
                }

                // At this stage, we now have a bitstream of "01" ("1") or "10" ("0"), parse it into final decoded bitstream
                // Actually, we overwrite BitStream with the new decoded bitstream, we just need to be careful
                // to stop output at the final bitidx2 value, not bitidx
                for (i = 0; i < bitidx; i += 2) {
                        if ((BitStream[i] == 0) && (BitStream[i+1] == 1)) {
                                BitStream[bit2idx++] = 1 ^ invert;
                        } else if ((BitStream[i] == 1) && (BitStream[i+1] == 0)) {
                                BitStream[bit2idx++] = 0 ^ invert;
                        } else {
                                // We cannot end up in this state, this means we are unsynchronized,
                                // move up 1 bit:
                                i++;
                                warnings++;
                                PrintAndLog("Unsynchronized, resync...");
                                PrintAndLog("(too many of those messages mean the stream is not Manchester encoded)");

                                if (warnings > 10)
                                {
                                        PrintAndLog("Error: too many decode errors, aborting.");
                                        return 0;
                                }
                        }
                }
        }

        PrintAndLog("Manchester decoded bitstream");
        // Now output the bitstream to the scrollback by line of 16 bits
        for (i = 0; i < (bit2idx-16); i+=16) {
                PrintAndLog("%i %i %i %i %i %i %i %i %i %i %i %i %i %i %i %i",
                        BitStream[i],
                        BitStream[i+1],
                        BitStream[i+2],
                        BitStream[i+3],
                        BitStream[i+4],
                        BitStream[i+5],
                        BitStream[i+6],
                        BitStream[i+7],
                        BitStream[i+8],
                        BitStream[i+9],
                        BitStream[i+10],
                        BitStream[i+11],
                        BitStream[i+12],
                        BitStream[i+13],
                        BitStream[i+14],
                        BitStream[i+15]);
        }
        return 0;
}

/* Modulate our data into manchester */
int CmdManchesterMod(const char *Cmd)
{
        int i, j;
        int clock;
        int bit, lastbit, wave;

        /* Get our clock */
        clock = GetClock(Cmd, 0, 1);

        wave = 0;
        lastbit = 1;
        for (i = 0; i < (int)(GraphTraceLen / clock); i++)
        {
                bit = GraphBuffer[i * clock] ^ 1;

                for (j = 0; j < (int)(clock/2); j++)
                        GraphBuffer[(i * clock) + j] = bit ^ lastbit ^ wave;
                for (j = (int)(clock/2); j < clock; j++)
                        GraphBuffer[(i * clock) + j] = bit ^ lastbit ^ wave ^ 1;

                /* Keep track of how we start our wave and if we changed or not this time */
                wave ^= bit ^ lastbit;
                lastbit = bit;
        }

        RepaintGraphWindow();
        return 0;
}

int CmdNorm(const char *Cmd)
{
        int i;
        int max = INT_MIN, min = INT_MAX;

        for (i = 10; i < GraphTraceLen; ++i) {
                if (GraphBuffer[i] > max)
                        max = GraphBuffer[i];
                if (GraphBuffer[i] < min)
                        min = GraphBuffer[i];
        }

        if (max != min) {
                for (i = 0; i < GraphTraceLen; ++i) {
                        GraphBuffer[i] = (GraphBuffer[i] - ((max + min) / 2)) * 256 /
                                (max - min);
                                //marshmelow: adjusted *1000 to *256 to make +/- 128 so demod commands still work
                }
        }
        RepaintGraphWindow();
        return 0;
}

int CmdPlot(const char *Cmd)
{
        ShowGraphWindow();
        return 0;
}

int CmdSave(const char *Cmd)
{
        FILE *f = fopen(Cmd, "w");
        if(!f) {
                PrintAndLog("couldn't open '%s'", Cmd);
                return 0;
        }
        int i;
        for (i = 0; i < GraphTraceLen; i++) {
                fprintf(f, "%d\n", GraphBuffer[i]);
        }
        fclose(f);
        PrintAndLog("saved to '%s'", Cmd);
        return 0;
}

int CmdScale(const char *Cmd)
{
        CursorScaleFactor = atoi(Cmd);
        if (CursorScaleFactor == 0) {
                PrintAndLog("bad, can't have zero scale");
                CursorScaleFactor = 1;
        }
        RepaintGraphWindow();
        return 0;
}

int CmdThreshold(const char *Cmd)
{
        int threshold = atoi(Cmd);

        for (int i = 0; i < GraphTraceLen; ++i) {
                if (GraphBuffer[i] >= threshold)
                        GraphBuffer[i] = 1;
                else
                        GraphBuffer[i] = -1;
        }
        RepaintGraphWindow();
        return 0;
}

int CmdDirectionalThreshold(const char *Cmd)
{
        int8_t upThres = param_get8(Cmd, 0);
        int8_t downThres = param_get8(Cmd, 1);

        printf("Applying Up Threshold: %d, Down Threshold: %d\n", upThres, downThres);

        int lastValue = GraphBuffer[0];
        GraphBuffer[0] = 0; // Will be changed at the end, but init 0 as we adjust to last samples value if no threshold kicks in.

        for (int i = 1; i < GraphTraceLen; ++i) {
                // Apply first threshold to samples heading up
                if (GraphBuffer[i] >= upThres && GraphBuffer[i] > lastValue)
                {
                        lastValue = GraphBuffer[i]; // Buffer last value as we overwrite it.
                        GraphBuffer[i] = 1;
                }
                // Apply second threshold to samples heading down
                else if (GraphBuffer[i] <= downThres && GraphBuffer[i] < lastValue)
                {
                        lastValue = GraphBuffer[i]; // Buffer last value as we overwrite it.
                        GraphBuffer[i] = -1;
                }
                else
                {
                        lastValue = GraphBuffer[i]; // Buffer last value as we overwrite it.
                        GraphBuffer[i] = GraphBuffer[i-1];

                }
        }
        GraphBuffer[0] = GraphBuffer[1]; // Aline with first edited sample.
        RepaintGraphWindow();
        return 0;
}

int CmdZerocrossings(const char *Cmd)
{
        // Zero-crossings aren't meaningful unless the signal is zero-mean.
        CmdHpf("");

        int sign = 1;
        int zc = 0;
        int lastZc = 0;

        for (int i = 0; i < GraphTraceLen; ++i) {
                if (GraphBuffer[i] * sign >= 0) {
                        // No change in sign, reproduce the previous sample count.
                        zc++;
                        GraphBuffer[i] = lastZc;
                } else {
                        // Change in sign, reset the sample count.
                        sign = -sign;
                        GraphBuffer[i] = lastZc;
                        if (sign > 0) {
                                lastZc = zc;
                                zc = 0;
                        }
                }
        }

        RepaintGraphWindow();
        return 0;
}

static command_t CommandTable[] =
{
        {"help",          CmdHelp,            1, "This help"},
        {"amp",           CmdAmp,             1, "Amplify peaks"},
        {"askdemod",      Cmdaskdemod,        1, "<0 or 1> -- Attempt to demodulate simple ASK tags"},
        {"askmandemod",   Cmdaskmandemod,     1, "[clock] [invert<0|1>] -- Attempt to demodulate ASK/Manchester tags and output binary (args optional[clock will try Auto-detect])"},
        {"askrawdemod",   Cmdaskrawdemod,     1, "[clock] [invert<0|1>] -- Attempt to demodulate ASK tags and output binary (args optional[clock will try Auto-detect])"},
        {"autocorr",      CmdAutoCorr,        1, "<window length> -- Autocorrelation over window"},
        {"biphaserawdecode",CmdBiphaseDecodeRaw,1,"[offset] Biphase decode binary stream already in graph buffer (offset = bit to start decode from)"},
        {"bitsamples",    CmdBitsamples,      0, "Get raw samples as bitstring"},
        {"bitstream",     CmdBitstream,       1, "[clock rate] -- Convert waveform into a bitstream"},
        {"buffclear",     CmdBuffClear,       1, "Clear sample buffer and graph window"},
        {"dec",           CmdDec,             1, "Decimate samples"},
        {"detectclock",   CmdDetectClockRate, 1, "Detect ASK clock rate"},
        {"fskdemod",      CmdFSKdemod,        1, "Demodulate graph window as a HID FSK"},
        {"fskhiddemod",   CmdFSKdemodHID,     1, "Demodulate graph window as a HID FSK using raw"},
        {"fskiodemod",    CmdFSKdemodIO,      1, "Demodulate graph window as an IO Prox FSK using raw"},
        {"fskrawdemod",   CmdFSKrawdemod,     1, "[clock rate] [invert] [rchigh] [rclow] Demodulate graph window from FSK to binary (clock = 50)(invert = 1|0)(rchigh = 10)(rclow=8)"},
        {"grid",          CmdGrid,            1, "<x> <y> -- overlay grid on graph window, use zero value to turn off either"},
        {"hexsamples",    CmdHexsamples,      0, "<bytes> [<offset>] -- Dump big buffer as hex bytes"},
        {"hide",          CmdHide,            1, "Hide graph window"},
        {"hpf",           CmdHpf,             1, "Remove DC offset from trace"},
        {"load",          CmdLoad,            1, "<filename> -- Load trace (to graph window"},
        {"ltrim",         CmdLtrim,           1, "<samples> -- Trim samples from left of trace"},
        {"rtrim",         CmdRtrim,           1, "<location to end trace> -- Trim samples from right of trace"},
        {"mandemod",      CmdManchesterDemod, 1, "[i] [clock rate] -- Manchester demodulate binary stream (option 'i' to invert output)"},
        {"manrawdecode",  Cmdmandecoderaw,    1, "Manchester decode binary stream already in graph buffer"},
        {"manmod",        CmdManchesterMod,   1, "[clock rate] -- Manchester modulate a binary stream"},
        {"norm",          CmdNorm,            1, "Normalize max/min to +/-128"},
        {"plot",          CmdPlot,            1, "Show graph window (hit 'h' in window for keystroke help)"},
        {"pskclean",      CmdPskClean,        1, "Attempt to clean psk wave"},
        {"pskdetectclock",CmdDetectNRZpskClockRate, 1, "Detect ASK, PSK, or NRZ clock rate"},
        {"pskindalademod",CmdIndalaDecode,    1, "[clock] [invert<0|1>] -- Attempt to demodulate psk indala tags and output ID binary & hex (args optional[clock will try Auto-detect])"},
        {"psknrzrawdemod",CmdpskNRZrawDemod,  1, "[clock] [invert<0|1>] -- Attempt to demodulate psk or nrz tags and output binary (args optional[clock will try Auto-detect])"},
        {"samples",       CmdSamples,         0, "[512 - 40000] -- Get raw samples for graph window"},
        {"save",          CmdSave,            1, "<filename> -- Save trace (from graph window)"},
        {"scale",         CmdScale,           1, "<int> -- Set cursor display scale"},
        {"threshold",     CmdThreshold,       1, "<threshold> -- Maximize/minimize every value in the graph window depending on threshold"},
        {"dirthreshold",  CmdDirectionalThreshold,   1, "<thres up> <thres down> -- Max rising higher up-thres/ Min falling lower down-thres, keep rest as prev."},
        {"tune",          CmdTuneSamples,     0, "Get hw tune samples for graph window"},
        {"zerocrossings", CmdZerocrossings,   1, "Count time between zero-crossings"},
        {NULL, NULL, 0, NULL}
};

int CmdData(const char *Cmd)
{
        CmdsParse(CommandTable, Cmd);
        return 0;
}

int CmdHelp(const char *Cmd)
{
        CmdsHelp(CommandTable);
        return 0;
}