fix STT bug for strong waves (or cleaned ones)

[proxmark3-svn] / client / cmdlf.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.
//-----------------------------------------------------------------------------
// Low frequency commands
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "proxmark3.h"
#include "cmdlf.h"
#include "lfdemod.h"     // for psk2TOpsk1
#include "util.h"        // for parsing cli command utils
#include "ui.h"          // for show graph controls
#include "graph.h"       // for graph data
#include "cmdparser.h"   // for getting cli commands included in cmdmain.h
#include "cmdmain.h"     // for sending cmds to device
#include "data.h"        // for GetFromBigBuf
#include "cmddata.h"     // for `lf search`
#include "cmdlfawid.h"   // for awid menu
#include "cmdlfem4x.h"   // for em4x menu
#include "cmdlfhid.h"    // for hid menu
#include "cmdlfhitag.h"  // for hitag menu
#include "cmdlfio.h"     // for ioprox menu
#include "cmdlft55xx.h"  // for t55xx menu
#include "cmdlfti.h"     // for ti menu
#include "cmdlfpresco.h" // for presco menu
#include "cmdlfpcf7931.h"// for pcf7931 menu
#include "cmdlfpyramid.h"// for pyramid menu
#include "cmdlfviking.h" // for viking menu
#include "cmdlfcotag.h"  // for COTAG menu

bool g_lf_threshold_set = false;
static int CmdHelp(const char *Cmd);



int usage_lf_cmdread(void)
{
        PrintAndLog("Usage: lf cmdread d <delay period> z <zero period> o <one period> c <cmdbytes> [H] ");
        PrintAndLog("Options:        ");
        PrintAndLog("       h             This help");
        PrintAndLog("       L             Low frequency (125 KHz)");
        PrintAndLog("       H             High frequency (134 KHz)");
        PrintAndLog("       d <delay>     delay OFF period");
        PrintAndLog("       z <zero>      time period ZERO");
        PrintAndLog("       o <one>       time period ONE");
        PrintAndLog("       c <cmd>       Command bytes");
        PrintAndLog("       ************* All periods in microseconds");
        PrintAndLog("Examples:");
        PrintAndLog("      lf cmdread d 80 z 100 o 200 c 11000");
        PrintAndLog("      lf cmdread d 80 z 100 o 100 c 11000 H");
        return 0;
}

/* send a command before reading */
int CmdLFCommandRead(const char *Cmd)
{
        static char dummy[3] = {0x20,0x00,0x00};
        UsbCommand c = {CMD_MOD_THEN_ACQUIRE_RAW_ADC_SAMPLES_125K};
        bool errors = FALSE;
        //uint8_t divisor = 95; //125khz
        uint8_t cmdp = 0;
        while(param_getchar(Cmd, cmdp) != 0x00)
        {
                switch(param_getchar(Cmd, cmdp))
                {
                case 'h':
                        return usage_lf_cmdread();
                case 'H':
                        //divisor = 88;
                        dummy[1]='h';
                        cmdp++;
                        break;
                case 'L':
                        cmdp++;
                        break;
                case 'c':
                        param_getstr(Cmd, cmdp+1, (char *)&c.d.asBytes);
                        cmdp+=2;
                        break;
                case 'd':
                        c.arg[0] = param_get32ex(Cmd, cmdp+1, 0, 10);
                        cmdp+=2;
                        break;
                case 'z':
                        c.arg[1] = param_get32ex(Cmd, cmdp+1, 0, 10);
                        cmdp+=2;
                        break;
                case 'o':
                        c.arg[2] = param_get32ex(Cmd, cmdp+1, 0, 10);
                        cmdp+=2;
                        break;
                default:
                        PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
                        errors = 1;
                        break;
                }
                if(errors) break;
        }
        // No args
        if(cmdp == 0) errors = 1;

        //Validations
        if(errors) return usage_lf_cmdread();
        
        // in case they specified 'H'
        strcpy((char *)&c.d.asBytes + strlen((char *)c.d.asBytes), dummy);

        clearCommandBuffer();
        SendCommand(&c);
        return 0;
}

int CmdFlexdemod(const char *Cmd)
{
        int i;
        for (i = 0; i < GraphTraceLen; ++i) {
                if (GraphBuffer[i] < 0) {
                        GraphBuffer[i] = -1;
                } else {
                        GraphBuffer[i] = 1;
                }
        }

 #define LONG_WAIT 100
        int start;
        for (start = 0; start < GraphTraceLen - LONG_WAIT; start++) {
                int first = GraphBuffer[start];
                for (i = start; i < start + LONG_WAIT; i++) {
                        if (GraphBuffer[i] != first) {
                                break;
                        }
                }
                if (i == (start + LONG_WAIT)) {
                        break;
                }
        }
        if (start == GraphTraceLen - LONG_WAIT) {
                PrintAndLog("nothing to wait for");
                return 0;
        }

        GraphBuffer[start] = 2;
        GraphBuffer[start+1] = -2;
        uint8_t bits[64] = {0x00};

        int bit, sum;
        i = start;
        for (bit = 0; bit < 64; bit++) {
                sum = 0;
                for (int j = 0; j < 16; j++) {
                        sum += GraphBuffer[i++];
                }

                bits[bit] = (sum > 0) ? 1 : 0;

                PrintAndLog("bit %d sum %d", bit, sum);
        }

        for (bit = 0; bit < 64; bit++) {
                int j;
                int sum = 0;
                for (j = 0; j < 16; j++) {
                        sum += GraphBuffer[i++];
                }
                if (sum > 0 && bits[bit] != 1) {
                        PrintAndLog("oops1 at %d", bit);
                }
                if (sum < 0 && bits[bit] != 0) {
                        PrintAndLog("oops2 at %d", bit);
                }
        }

        // HACK writing back to graphbuffer.
        GraphTraceLen = 32*64;
        i = 0;
        int phase = 0;
        for (bit = 0; bit < 64; bit++) {
        
                phase = (bits[bit] == 0) ? 0 : 1;
                
                int j;
                for (j = 0; j < 32; j++) {
                        GraphBuffer[i++] = phase;
                        phase = !phase;
                }
        }

        RepaintGraphWindow();
        return 0;
}
        
int CmdIndalaDemod(const char *Cmd)
{
        // Usage: recover 64bit UID by default, specify "224" as arg to recover a 224bit UID

        int state = -1;
        int count = 0;
        int i, j;

        // worst case with GraphTraceLen=64000 is < 4096
        // under normal conditions it's < 2048

        uint8_t rawbits[4096];
        int rawbit = 0;
        int worst = 0, worstPos = 0;
        // PrintAndLog("Expecting a bit less than %d raw bits", GraphTraceLen / 32);
        
        // loop through raw signal - since we know it is psk1 rf/32 fc/2 skip every other value (+=2)
        for (i = 0; i < GraphTraceLen-1; i += 2) {
                count += 1;
                if ((GraphBuffer[i] > GraphBuffer[i + 1]) && (state != 1)) {
                        // appears redundant - marshmellow
                        if (state == 0) {
                                for (j = 0; j <  count - 8; j += 16) {
                                        rawbits[rawbit++] = 0;
                                }
                                if ((abs(count - j)) > worst) {
                                        worst = abs(count - j);
                                        worstPos = i;
                                }
                        }
                        state = 1;
                        count = 0;
                } else if ((GraphBuffer[i] < GraphBuffer[i + 1]) && (state != 0)) {
                        //appears redundant
                        if (state == 1) {
                                for (j = 0; j <  count - 8; j += 16) {
                                        rawbits[rawbit++] = 1;
                                }
                                if ((abs(count - j)) > worst) {
                                        worst = abs(count - j);
                                        worstPos = i;
                                }
                        }
                        state = 0;
                        count = 0;
                }
        }
        
        if (rawbit>0){
                PrintAndLog("Recovered %d raw bits, expected: %d", rawbit, GraphTraceLen/32);
                PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
        } else {
                return 0;
        }

        // Finding the start of a UID
        int uidlen, long_wait;
        if (strcmp(Cmd, "224") == 0) {
                uidlen = 224;
                long_wait = 30;
        } else {
                uidlen = 64;
                long_wait = 29;
        }

        int start;
        int first = 0;
        for (start = 0; start <= rawbit - uidlen; start++) {
                first = rawbits[start];
                for (i = start; i < start + long_wait; i++) {
                        if (rawbits[i] != first) {
                                break;
                        }
                }
                if (i == (start + long_wait)) {
                        break;
                }
        }
        
        if (start == rawbit - uidlen + 1) {
                PrintAndLog("nothing to wait for");
                return 0;
        }

        // Inverting signal if needed
        if (first == 1) {
                for (i = start; i < rawbit; i++) {
                        rawbits[i] = !rawbits[i];
                }
        }

        // Dumping UID
        uint8_t bits[224] = {0x00};
        char showbits[225] = {0x00};
        int bit;
        i = start;
        int times = 0;
        
        if (uidlen > rawbit) {
                PrintAndLog("Warning: not enough raw bits to get a full UID");
                for (bit = 0; bit < rawbit; bit++) {
                        bits[bit] = rawbits[i++];
                        // As we cannot know the parity, let's use "." and "/"
                        showbits[bit] = '.' + bits[bit];
                }
                showbits[bit+1]='\0';
                PrintAndLog("Partial UID=%s", showbits);
                return 0;
        } else {
                for (bit = 0; bit < uidlen; bit++) {
                        bits[bit] = rawbits[i++];
                        showbits[bit] = '0' + bits[bit];
                }
                times = 1;
        }
        
        //convert UID to HEX
        uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
        int idx;
        uid1 = uid2 = 0;
        
        if (uidlen==64){
                for( idx=0; idx<64; idx++) {
                                if (showbits[idx] == '0') {
                                uid1=(uid1<<1)|(uid2>>31);
                                uid2=(uid2<<1)|0;
                                } else {
                                uid1=(uid1<<1)|(uid2>>31);
                                uid2=(uid2<<1)|1;
                                } 
                        }
                PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
        }
        else {
                uid3 = uid4 = uid5 = uid6 = uid7 = 0;

                for( idx=0; idx<224; 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 (showbits[idx] == '0') 
                                uid7 = (uid7<<1) | 0;
                        else 
                                uid7 = (uid7<<1) | 1;
                        }
                PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
        }

        // Checking UID against next occurrences
                int failed = 0;
        for (; i + uidlen <= rawbit;) {
                failed = 0;
                for (bit = 0; bit < uidlen; bit++) {
                        if (bits[bit] != rawbits[i++]) {
                                failed = 1;
                                break;
                        }
                }
                if (failed == 1) {
                        break;
                }
                times += 1;
        }

        PrintAndLog("Occurrences: %d (expected %d)", times, (rawbit - start) / uidlen);

        // Remodulating for tag cloning
        // HACK: 2015-01-04 this will have an impact on our new way of seening lf commands (demod) 
        // since this changes graphbuffer data.
        GraphTraceLen = 32*uidlen;
        i = 0;
        int phase = 0;
        for (bit = 0; bit < uidlen; bit++) {
                if (bits[bit] == 0) {
                        phase = 0;
                } else {
                        phase = 1;
                }
                int j;
                for (j = 0; j < 32; j++) {
                        GraphBuffer[i++] = phase;
                        phase = !phase;
                }
        }

        RepaintGraphWindow();
        return 1;
}

int CmdIndalaClone(const char *Cmd)
{
        UsbCommand c;
        unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;

        uid1 =  uid2 = uid3 = uid4 = uid5 = uid6 = uid7 = 0;
        int n = 0, i = 0;

        if (strchr(Cmd,'l') != 0) {
                while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
                        uid1 = (uid1 << 4) | (uid2 >> 28);
                        uid2 = (uid2 << 4) | (uid3 >> 28);
                        uid3 = (uid3 << 4) | (uid4 >> 28);
                        uid4 = (uid4 << 4) | (uid5 >> 28);
                        uid5 = (uid5 << 4) | (uid6 >> 28);
                        uid6 = (uid6 << 4) | (uid7 >> 28);
                        uid7 = (uid7 << 4) | (n & 0xf);
                }
                PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
                c.cmd = CMD_INDALA_CLONE_TAG_L;
                c.d.asDwords[0] = uid1;
                c.d.asDwords[1] = uid2;
                c.d.asDwords[2] = uid3;
                c.d.asDwords[3] = uid4;
                c.d.asDwords[4] = uid5;
                c.d.asDwords[5] = uid6;
                c.d.asDwords[6] = uid7;
        } else {
                while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
                        uid1 = (uid1 << 4) | (uid2 >> 28);
                        uid2 = (uid2 << 4) | (n & 0xf);
                }
                PrintAndLog("Cloning 64bit tag with UID %x%08x", uid1, uid2);
                c.cmd = CMD_INDALA_CLONE_TAG;
                c.arg[0] = uid1;
                c.arg[1] = uid2;
        }

        clearCommandBuffer();
        SendCommand(&c);
        return 0;
}

int usage_lf_read(void)
{
        PrintAndLog("Usage: lf read");
        PrintAndLog("Options:        ");
        PrintAndLog("       h            This help");
        PrintAndLog("       s            silent run no printout");
        PrintAndLog("This function takes no arguments. ");
        PrintAndLog("Use 'lf config' to set parameters.");
        return 0;
}
int usage_lf_snoop(void)
{
        PrintAndLog("Usage: lf snoop");
        PrintAndLog("Options:        ");
        PrintAndLog("       h            This help");
        PrintAndLog("This function takes no arguments. ");
        PrintAndLog("Use 'lf config' to set parameters.");
        return 0;
}

int usage_lf_config(void)
{
        PrintAndLog("Usage: lf config [H|<divisor>] [b <bps>] [d <decim>] [a 0|1]");
        PrintAndLog("Options:        ");
        PrintAndLog("       h             This help");
        PrintAndLog("       L             Low frequency (125 KHz)");
        PrintAndLog("       H             High frequency (134 KHz)");
        PrintAndLog("       q <divisor>   Manually set divisor. 88-> 134KHz, 95-> 125 Hz");
        PrintAndLog("       b <bps>       Sets resolution of bits per sample. Default (max): 8");
        PrintAndLog("       d <decim>     Sets decimation. A value of N saves only 1 in N samples. Default: 1");
        PrintAndLog("       a [0|1]       Averaging - if set, will average the stored sample value when decimating. Default: 1");
        PrintAndLog("       t <threshold> Sets trigger threshold. 0 means no threshold (range: 0-128)");
        PrintAndLog("Examples:");
        PrintAndLog("      lf config b 8 L");
        PrintAndLog("                    Samples at 125KHz, 8bps.");
        PrintAndLog("      lf config H b 4 d 3");
        PrintAndLog("                    Samples at 134KHz, averages three samples into one, stored with ");
        PrintAndLog("                    a resolution of 4 bits per sample.");
        PrintAndLog("      lf read");
        PrintAndLog("                    Performs a read (active field)");
        PrintAndLog("      lf snoop");
        PrintAndLog("                    Performs a snoop (no active field)");
        return 0;
}

int CmdLFSetConfig(const char *Cmd)
{

        uint8_t divisor =  0;//Frequency divisor
        uint8_t bps = 0; // Bits per sample
        uint8_t decimation = 0; //How many to keep
        bool averaging = 1; // Defaults to true
        bool errors = FALSE;
        int trigger_threshold =-1;//Means no change
        uint8_t unsigned_trigg = 0;

        uint8_t cmdp =0;
        while(param_getchar(Cmd, cmdp) != 0x00)
        {
                switch(param_getchar(Cmd, cmdp))
                {
                case 'h':
                        return usage_lf_config();
                case 'H':
                        divisor = 88;
                        cmdp++;
                        break;
                case 'L':
                        divisor = 95;
                        cmdp++;
                        break;
                case 'q':
                        errors |= param_getdec(Cmd,cmdp+1,&divisor);
                        cmdp+=2;
                        break;
                case 't':
                        errors |= param_getdec(Cmd,cmdp+1,&unsigned_trigg);
                        cmdp+=2;
                        if(!errors) {
                                trigger_threshold = unsigned_trigg;
                                if (trigger_threshold > 0) g_lf_threshold_set = true;
                        }
                        break;
                case 'b':
                        errors |= param_getdec(Cmd,cmdp+1,&bps);
                        cmdp+=2;
                        break;
                case 'd':
                        errors |= param_getdec(Cmd,cmdp+1,&decimation);
                        cmdp+=2;
                        break;
                case 'a':
                        averaging = param_getchar(Cmd,cmdp+1) == '1';
                        cmdp+=2;
                        break;
                default:
                        PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
                        errors = 1;
                        break;
                }
                if(errors) break;
        }
        if(cmdp == 0)
        {
                errors = 1;// No args
        }

        //Validations
        if(errors)
        {
                return usage_lf_config();
        }
        //Bps is limited to 8, so fits in lower half of arg1
        if(bps >> 4) bps = 8;

        sample_config config = {
                decimation,bps,averaging,divisor,trigger_threshold
        };
        //Averaging is a flag on high-bit of arg[1]
        UsbCommand c = {CMD_SET_LF_SAMPLING_CONFIG};
        memcpy(c.d.asBytes,&config,sizeof(sample_config));
        clearCommandBuffer();
        SendCommand(&c);
        return 0;
}

int CmdLFRead(const char *Cmd)
{
        if (offline) return 0;
        uint8_t cmdp = 0;
        bool arg1 = false;
        if (param_getchar(Cmd, cmdp) == 'h')
        {
                return usage_lf_read();
        }
        if (param_getchar(Cmd, cmdp) == 's') arg1 = true; //suppress print
        //And ship it to device
        UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_125K, {arg1,0,0}};
        clearCommandBuffer();
        SendCommand(&c);
        if (g_lf_threshold_set) {
                WaitForResponse(CMD_ACK,NULL);
        } else {
                if ( !WaitForResponseTimeout(CMD_ACK,NULL,2500) ) {
                        PrintAndLog("command execution time out");
                        return 1;
                }
        }
        return 0;
}

int CmdLFSnoop(const char *Cmd)
{
        uint8_t cmdp =0;
        if(param_getchar(Cmd, cmdp) == 'h')
        {
                return usage_lf_snoop();
        }

        UsbCommand c = {CMD_LF_SNOOP_RAW_ADC_SAMPLES};
        clearCommandBuffer();
        SendCommand(&c);
        WaitForResponse(CMD_ACK,NULL);
        return 0;
}

static void ChkBitstream(const char *str)
{
        int i;
 
        /* convert to bitstream if necessary */
        for (i = 0; i < (int)(GraphTraceLen / 2); i++){
                if (GraphBuffer[i] > 1 || GraphBuffer[i] < 0) {
                        CmdGetBitStream("");
                        break;
                }
        }
}
//Attempt to simulate any wave in buffer (one bit per output sample)
// converts GraphBuffer to bitstream (based on zero crossings) if needed.
int CmdLFSim(const char *Cmd)
{
        int i,j;
        static int gap;

        sscanf(Cmd, "%i", &gap);

        // convert to bitstream if necessary 

        ChkBitstream(Cmd);

        //can send only 512 bits at a time (1 byte sent per bit...)
        printf("Sending [%d bytes]", GraphTraceLen);
        for (i = 0; i < GraphTraceLen; i += USB_CMD_DATA_SIZE) {
                UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {i, 0, 0}};

                for (j = 0; j < USB_CMD_DATA_SIZE; j++) {
                        c.d.asBytes[j] = GraphBuffer[i+j];
                }
                SendCommand(&c);
                WaitForResponse(CMD_ACK,NULL);
                printf(".");
        }

        printf("\n");
        PrintAndLog("Starting to simulate");
        UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
        clearCommandBuffer();
        SendCommand(&c);
        return 0;
}

int usage_lf_simfsk(void)
{
        //print help
        PrintAndLog("Usage: lf simfsk [c <clock>] [i] [H <fcHigh>] [L <fcLow>] [d <hexdata>]");
        PrintAndLog("Options:        ");
        PrintAndLog("       h              This help");
        PrintAndLog("       c <clock>      Manually set clock - can autodetect if using DemodBuffer");
        PrintAndLog("       i              invert data");
        PrintAndLog("       H <fcHigh>     Manually set the larger Field Clock");
        PrintAndLog("       L <fcLow>      Manually set the smaller Field Clock");
        //PrintAndLog("       s              TBD- -to enable a gap between playback repetitions - default: no gap");
        PrintAndLog("       d <hexdata>    Data to sim as hex - omit to sim from DemodBuffer");
        PrintAndLog("\n  NOTE: if you set one clock manually set them all manually");
        return 0;
}

int usage_lf_simask(void)
{
        //print help
        PrintAndLog("Usage: lf simask [c <clock>] [i] [b|m|r] [s] [d <raw hex to sim>]");
        PrintAndLog("Options:        ");
        PrintAndLog("       h              This help");
        PrintAndLog("       c <clock>      Manually set clock - can autodetect if using DemodBuffer");
        PrintAndLog("       i              invert data");
        PrintAndLog("       b              sim ask/biphase");
        PrintAndLog("       m              sim ask/manchester - Default");
        PrintAndLog("       r              sim ask/raw");
        PrintAndLog("       s              add t55xx Sequence Terminator gap - default: no gaps (only manchester)");
        PrintAndLog("       d <hexdata>    Data to sim as hex - omit to sim from DemodBuffer");
        return 0;
}

int usage_lf_simpsk(void)
{
        //print help
        PrintAndLog("Usage: lf simpsk [1|2|3] [c <clock>] [i] [r <carrier>] [d <raw hex to sim>]");
        PrintAndLog("Options:        ");
        PrintAndLog("       h              This help");
        PrintAndLog("       c <clock>      Manually set clock - can autodetect if using DemodBuffer");
        PrintAndLog("       i              invert data");
        PrintAndLog("       1              set PSK1 (default)");
        PrintAndLog("       2              set PSK2");
        PrintAndLog("       3              set PSK3");
        PrintAndLog("       r <carrier>    2|4|8 are valid carriers: default = 2");
        PrintAndLog("       d <hexdata>    Data to sim as hex - omit to sim from DemodBuffer");
        return 0;
}

// by marshmellow - sim fsk data given clock, fcHigh, fcLow, invert 
// - allow pull data from DemodBuffer
int CmdLFfskSim(const char *Cmd)
{
        //might be able to autodetect FCs and clock from Graphbuffer if using demod buffer
        // otherwise will need FChigh, FClow, Clock, and bitstream
        uint8_t fcHigh=0, fcLow=0, clk=0;
        uint8_t invert=0;
        bool errors = FALSE;
        char hexData[32] = {0x00}; // store entered hex data
        uint8_t data[255] = {0x00}; 
        int dataLen = 0;
        uint8_t cmdp = 0;
        while(param_getchar(Cmd, cmdp) != 0x00)
        {
                switch(param_getchar(Cmd, cmdp))
                {
                case 'h':
                        return usage_lf_simfsk();
                case 'i':
                        invert = 1;
                        cmdp++;
                        break;
                case 'c':
                        errors |= param_getdec(Cmd,cmdp+1,&clk);
                        cmdp+=2;
                        break;
                case 'H':
                        errors |= param_getdec(Cmd,cmdp+1,&fcHigh);
                        cmdp+=2;
                        break;
                case 'L':
                        errors |= param_getdec(Cmd,cmdp+1,&fcLow);
                        cmdp+=2;
                        break;
                //case 's':
                //  separator=1;
                //  cmdp++;
                //  break;
                case 'd':
                        dataLen = param_getstr(Cmd, cmdp+1, hexData);
                        if (dataLen==0) {
                                errors=TRUE; 
                        } else {
                                dataLen = hextobinarray((char *)data, hexData);
                        }   
                        if (dataLen==0) errors=TRUE; 
                        if (errors) PrintAndLog ("Error getting hex data");
                        cmdp+=2;
                        break;
                default:
                        PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
                        errors = TRUE;
                        break;
                }
                if(errors) break;
        }
        if(cmdp == 0 && DemodBufferLen == 0)
        {
                errors = TRUE;// No args
        }

        //Validations
        if(errors)
        {
                return usage_lf_simfsk();
        }

        if (dataLen == 0){ //using DemodBuffer 
                if (clk==0 || fcHigh==0 || fcLow==0){ //manual settings must set them all
                        uint8_t ans = fskClocks(&fcHigh, &fcLow, &clk, 0);
                        if (ans==0){
                                if (!fcHigh) fcHigh=10;
                                if (!fcLow) fcLow=8;
                                if (!clk) clk=50;
                        }
                }
        } else {
                setDemodBuf(data, dataLen, 0);
        }

        //default if not found
        if (clk == 0) clk = 50;
        if (fcHigh == 0) fcHigh = 10;
        if (fcLow == 0) fcLow = 8;

        uint16_t arg1, arg2;
        arg1 = fcHigh << 8 | fcLow;
        arg2 = invert << 8 | clk;
        size_t size = DemodBufferLen;
        if (size > USB_CMD_DATA_SIZE) {
                PrintAndLog("DemodBuffer too long for current implementation - length: %d - max: %d", size, USB_CMD_DATA_SIZE);
                size = USB_CMD_DATA_SIZE;
        } 
        UsbCommand c = {CMD_FSK_SIM_TAG, {arg1, arg2, size}};

        memcpy(c.d.asBytes, DemodBuffer, size);
        clearCommandBuffer();
        SendCommand(&c);
        return 0;
}

// by marshmellow - sim ask data given clock, invert, manchester or raw, separator 
// - allow pull data from DemodBuffer
int CmdLFaskSim(const char *Cmd)
{
        //autodetect clock from Graphbuffer if using demod buffer
        // needs clock, invert, manchester/raw as m or r, separator as s, and bitstream
        uint8_t encoding = 1, separator = 0;
        uint8_t clk=0, invert=0;
        bool errors = FALSE;
        char hexData[32] = {0x00}; 
        uint8_t data[255]= {0x00}; // store entered hex data
        int dataLen = 0;
        uint8_t cmdp = 0;
        while(param_getchar(Cmd, cmdp) != 0x00)
        {
                switch(param_getchar(Cmd, cmdp))
                {
                case 'h':
                        return usage_lf_simask();
                case 'i':
                        invert = 1;
                        cmdp++;
                        break;
                case 'c':
                        errors |= param_getdec(Cmd,cmdp+1,&clk);
                        cmdp+=2;
                        break;
                case 'b':
                        encoding=2; //biphase
                        cmdp++;
                        break;
                case 'm':
                        encoding=1;
                        cmdp++;
                        break;
                case 'r':
                        encoding=0;
                        cmdp++;
                        break;
                case 's':
                        separator=1;
                        cmdp++;
                        break;
                case 'd':
                        dataLen = param_getstr(Cmd, cmdp+1, hexData);
                        if (dataLen==0) {
                                errors=TRUE; 
                        } else {
                                dataLen = hextobinarray((char *)data, hexData);
                        }
                        if (dataLen==0) errors=TRUE; 
                        if (errors) PrintAndLog ("Error getting hex data, datalen: %d",dataLen);
                                cmdp+=2;
                        break;
                default:
                        PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
                        errors = TRUE;
                        break;
                }
                if(errors) break;
        }
        if(cmdp == 0 && DemodBufferLen == 0)
        {
                errors = TRUE;// No args
        }

        //Validations
        if(errors)
        {
                return usage_lf_simask();
        }
        if (dataLen == 0){ //using DemodBuffer
                if (clk == 0) clk = GetAskClock("0", false, false);
        } else {
                setDemodBuf(data, dataLen, 0);
        }
        if (clk == 0) clk = 64;
        if (encoding == 0) clk = clk/2; //askraw needs to double the clock speed
        uint16_t arg1, arg2;
        size_t size=DemodBufferLen;
        arg1 = clk << 8 | encoding;
        arg2 = invert << 8 | separator;
        if (size > USB_CMD_DATA_SIZE) {
                PrintAndLog("DemodBuffer too long for current implementation - length: %d - max: %d", size, USB_CMD_DATA_SIZE);
                size = USB_CMD_DATA_SIZE;
        }
        UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
        PrintAndLog("preparing to sim ask data: %d bits", size);
        memcpy(c.d.asBytes, DemodBuffer, size);
        clearCommandBuffer();
        SendCommand(&c);
        return 0;
}

// by marshmellow - sim psk data given carrier, clock, invert 
// - allow pull data from DemodBuffer or parameters
int CmdLFpskSim(const char *Cmd)
{
        //might be able to autodetect FC and clock from Graphbuffer if using demod buffer
        //will need carrier, Clock, and bitstream
        uint8_t carrier=0, clk=0;
        uint8_t invert=0;
        bool errors = FALSE;
        char hexData[32] = {0x00}; // store entered hex data
        uint8_t data[255] = {0x00}; 
        int dataLen = 0;
        uint8_t cmdp = 0;
        uint8_t pskType = 1;
        while(param_getchar(Cmd, cmdp) != 0x00)
        {
                switch(param_getchar(Cmd, cmdp))
                {
                case 'h':
                        return usage_lf_simpsk();
                case 'i':
                        invert = 1;
                        cmdp++;
                        break;
                case 'c':
                        errors |= param_getdec(Cmd,cmdp+1,&clk);
                        cmdp+=2;
                        break;
                case 'r':
                        errors |= param_getdec(Cmd,cmdp+1,&carrier);
                        cmdp+=2;
                        break;
                case '1':
                        pskType=1;
                        cmdp++;
                        break;
                case '2':
                        pskType=2;
                        cmdp++;
                        break;
                case '3':
                        pskType=3;
                        cmdp++;
                        break;
                case 'd':
                        dataLen = param_getstr(Cmd, cmdp+1, hexData);
                        if (dataLen==0) {
                                errors=TRUE; 
                        } else {
                                dataLen = hextobinarray((char *)data, hexData);
                        }    
                        if (dataLen==0) errors=TRUE; 
                        if (errors) PrintAndLog ("Error getting hex data");
                        cmdp+=2;
                        break;
                default:
                        PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
                        errors = TRUE;
                        break;
                }
                if (errors) break;
        }
        if (cmdp == 0 && DemodBufferLen == 0)
        {
                errors = TRUE;// No args
        }

        //Validations
        if (errors)
        {
                return usage_lf_simpsk();
        }
        if (dataLen == 0){ //using DemodBuffer
                PrintAndLog("Getting Clocks");
                if (clk==0) clk = GetPskClock("", FALSE, FALSE);
                PrintAndLog("clk: %d",clk);
                if (!carrier) carrier = GetPskCarrier("", FALSE, FALSE); 
                PrintAndLog("carrier: %d", carrier);
        } else {
                setDemodBuf(data, dataLen, 0);
        }

        if (clk <= 0) clk = 32;
        if (carrier == 0) carrier = 2;
        if (pskType != 1){
                if (pskType == 2){
                        //need to convert psk2 to psk1 data before sim
                        psk2TOpsk1(DemodBuffer, DemodBufferLen);
                } else {
                        PrintAndLog("Sorry, PSK3 not yet available");
                }
        }
        uint16_t arg1, arg2;
        arg1 = clk << 8 | carrier;
        arg2 = invert;
        size_t size=DemodBufferLen;
        if (size > USB_CMD_DATA_SIZE) {
                PrintAndLog("DemodBuffer too long for current implementation - length: %d - max: %d", size, USB_CMD_DATA_SIZE);
                size=USB_CMD_DATA_SIZE;
        }
        UsbCommand c = {CMD_PSK_SIM_TAG, {arg1, arg2, size}};
        PrintAndLog("DEBUG: Sending DemodBuffer Length: %d", size);
        memcpy(c.d.asBytes, DemodBuffer, size);
        clearCommandBuffer();
        SendCommand(&c);
        
        return 0;
}

int CmdLFSimBidir(const char *Cmd)
{
        // Set ADC to twice the carrier for a slight supersampling
        // HACK: not implemented in ARMSRC.
        PrintAndLog("Not implemented yet.");
        UsbCommand c = {CMD_LF_SIMULATE_BIDIR, {47, 384, 0}};
        SendCommand(&c);
        return 0;
}

int CmdVchDemod(const char *Cmd)
{
        // Is this the entire sync pattern, or does this also include some
        // data bits that happen to be the same everywhere? That would be
        // lovely to know.
        static const int SyncPattern[] = {
                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, -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,  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, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        };

        // So first, we correlate for the sync pattern, and mark that.
        int bestCorrel = 0, bestPos = 0;
        int i;
        // It does us no good to find the sync pattern, with fewer than
        // 2048 samples after it...
        for (i = 0; i < (GraphTraceLen-2048); i++) {
                int sum = 0;
                int j;
                for (j = 0; j < arraylen(SyncPattern); j++) {
                        sum += GraphBuffer[i+j]*SyncPattern[j];
                }
                if (sum > bestCorrel) {
                        bestCorrel = sum;
                        bestPos = i;
                }
        }
        PrintAndLog("best sync at %d [metric %d]", bestPos, bestCorrel);

        char bits[257];
        bits[256] = '\0';

        int worst = INT_MAX;
        int worstPos = 0;

        for (i = 0; i < 2048; i += 8) {
                int sum = 0;
                int j;
                for (j = 0; j < 8; j++) {
                        sum += GraphBuffer[bestPos+i+j];
                }
                if (sum < 0) {
                        bits[i/8] = '.';
                } else {
                        bits[i/8] = '1';
                }
                if(abs(sum) < worst) {
                        worst = abs(sum);
                        worstPos = i;
                }
        }
        PrintAndLog("bits:");
        PrintAndLog("%s", bits);
        PrintAndLog("worst metric: %d at pos %d", worst, worstPos);

        if (strcmp(Cmd, "clone")==0) {
                GraphTraceLen = 0;
                char *s;
                for(s = bits; *s; s++) {
                        int j;
                        for(j = 0; j < 16; j++) {
                                GraphBuffer[GraphTraceLen++] = (*s == '1') ? 1 : 0;
                        }
                }
                RepaintGraphWindow();
        }
        return 0;
}


//by marshmellow
int CheckChipType(char cmdp) {
        uint32_t wordData = 0;

        //check for em4x05/em4x69 chips first
        save_restoreGB(1);
        if ((!offline && (cmdp != '1')) && EM4x05Block0Test(&wordData)) {
                PrintAndLog("\nValid EM4x05/EM4x69 Chip Found\nTry lf em 4x05... commands\n");
                save_restoreGB(0);
                return 1;
        }

        //TODO check for t55xx chip...

        save_restoreGB(0);
        return 1;
}

//by marshmellow
int CmdLFfind(const char *Cmd)
{
        uint32_t wordData = 0;
        int ans=0;
        size_t minLength = 1000;
        char cmdp = param_getchar(Cmd, 0);
        char testRaw = param_getchar(Cmd, 1);
        if (strlen(Cmd) > 3 || cmdp == 'h' || cmdp == 'H') {
                PrintAndLog("Usage:  lf search <0|1> [u]");
                PrintAndLog("     <use data from Graphbuffer> , if not set, try reading data from tag.");
                PrintAndLog("     [Search for Unknown tags] , if not set, reads only known tags.");
                PrintAndLog("");
                PrintAndLog("    sample: lf search     = try reading data from tag & search for known tags");
                PrintAndLog("          : lf search 1   = use data from GraphBuffer & search for known tags");
                PrintAndLog("          : lf search u   = try reading data from tag & search for known and unknown tags");
                PrintAndLog("          : lf search 1 u = use data from GraphBuffer & search for known and unknown tags");

                return 0;
        }

        if (!offline && (cmdp != '1')){
                CmdLFRead("s");
                getSamples("30000",false);
        } else if (GraphTraceLen < minLength) {
                PrintAndLog("Data in Graphbuffer was too small.");
                return 0;
        }
        if (cmdp == 'u' || cmdp == 'U') testRaw = 'u';

        PrintAndLog("NOTE: some demods output possible binary\n  if it finds something that looks like a tag");
        PrintAndLog("False Positives ARE possible\n");  
        PrintAndLog("\nChecking for known tags:\n");

        size_t testLen = minLength;
        // only run if graphbuffer is just noise as it should be for hitag/cotag
        if (graphJustNoise(GraphBuffer, testLen)) {
                // only run these tests if we are in online mode 
                if (!offline && (cmdp != '1')) {
                        // test for em4x05 in reader talk first mode.
                        if (EM4x05Block0Test(&wordData)) {
                                PrintAndLog("\nValid EM4x05/EM4x69 Chip Found\nUse lf em 4x05readword/dump commands to read\n");
                                return 1;
                        }
                        ans=CmdLFHitagReader("26");
                        if (ans==0) {
                                return 1;
                        }
                        ans=CmdCOTAGRead("");
                        if (ans>0){
                                PrintAndLog("\nValid COTAG ID Found!");
                                return 1;
                        }
                }
                return 0;
        }

        ans=CmdFSKdemodIO("");
        if (ans>0) {
                PrintAndLog("\nValid IO Prox ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdFSKdemodPyramid("");
        if (ans>0) {
                PrintAndLog("\nValid Pyramid ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdFSKdemodParadox("");
        if (ans>0) {
                PrintAndLog("\nValid Paradox ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdFSKdemodAWID("");
        if (ans>0) {
                PrintAndLog("\nValid AWID ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdFSKdemodHID("");
        if (ans>0) {
                PrintAndLog("\nValid HID Prox ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdAskEM410xDemod("");
        if (ans>0) {
                PrintAndLog("\nValid EM410x ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdG_Prox_II_Demod("");
        if (ans>0) {
                PrintAndLog("\nValid G Prox II ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdFDXBdemodBI("");
        if (ans>0) {
                PrintAndLog("\nValid FDX-B ID Found!");
                return CheckChipType(cmdp);
        }

        ans=EM4x50Read("", false);
        if (ans>0) {
                PrintAndLog("\nValid EM4x50 ID Found!");
                return 1;
        }       

        ans=CmdVikingDemod("");
        if (ans>0) {
                PrintAndLog("\nValid Viking ID Found!");
                return CheckChipType(cmdp);
        }       

        ans=CmdIndalaDecode("");
        if (ans>0) {
                PrintAndLog("\nValid Indala ID Found!");
                return CheckChipType(cmdp);
        }

        ans=CmdPSKNexWatch("");
        if (ans>0) {
                PrintAndLog("\nValid NexWatch ID Found!");
                return CheckChipType(cmdp);
        }

        PrintAndLog("\nNo Known Tags Found!\n");
        if (testRaw=='u' || testRaw=='U'){
                ans=CheckChipType(cmdp);
                //test unknown tag formats (raw mode)0
                PrintAndLog("\nChecking for Unknown tags:\n");
                ans=AutoCorrelate(4000, FALSE, FALSE);
                if (ans > 0) PrintAndLog("Possible Auto Correlation of %d repeating samples",ans);
                ans=GetFskClock("",FALSE,FALSE); 
                if (ans != 0){ //fsk
                        ans=FSKrawDemod("",TRUE);
                        if (ans>0) {
                                PrintAndLog("\nUnknown FSK Modulated Tag Found!");
                                return 1;
                        }
                }
                bool st = TRUE;
                ans=ASKDemod_ext("0 0 0",TRUE,FALSE,1,&st);
                if (ans>0) {
                        PrintAndLog("\nUnknown ASK Modulated and Manchester encoded Tag Found!");
                        PrintAndLog("\nif it does not look right it could instead be ASK/Biphase - try 'data rawdemod ab'");
                        return 1;
                }
                ans=CmdPSK1rawDemod("");
                if (ans>0) {
                        PrintAndLog("Possible unknown PSK1 Modulated Tag Found above!\n\nCould also be PSK2 - try 'data rawdemod p2'");
                        PrintAndLog("\nCould also be PSK3 - [currently not supported]");
                        PrintAndLog("\nCould also be NRZ - try 'data nrzrawdemod");
                        return 1;
                }
                PrintAndLog("\nNo Data Found!\n");
        }
        return 0;
}

static command_t CommandTable[] = 
{
        {"help",        CmdHelp,            1, "This help"},
        {"awid",        CmdLFAWID,          1, "{ AWID RFIDs...    }"},
        {"cotag",       CmdLFCOTAG,         1, "{ COTAG RFIDs...   }"},
        {"em",          CmdLFEM4X,          1, "{ EM4X RFIDs...    }"},
        {"hid",         CmdLFHID,           1, "{ HID RFIDs...     }"},
        {"hitag",       CmdLFHitag,         1, "{ Hitag tags and transponders... }"},
        {"io",          CmdLFIO,            1, "{ ioProx tags...   }"},
        {"presco",      CmdLFPresco,        1, "{ Presco RFIDs... }"},
        {"pcf7931",     CmdLFPCF7931,       1, "{ PCF7931 RFIDs... }"},
        {"pyramid",     CmdLFPyramid,       1, "{ Farpointe/Pyramid RFIDs... }"},
        {"t55xx",       CmdLFT55XX,         1, "{ T55xx RFIDs...   }"},
        {"ti",          CmdLFTI,            1, "{ TI RFIDs...      }"},
        {"viking",      CmdLFViking,        1, "{ Viking tags...   }"},
        {"cmdread",     CmdLFCommandRead,   0, "<d period> <z period> <o period> <c command> ['H'] -- Modulate LF reader field to send command before read (all periods in microseconds) (option 'H' for 134)"},
        {"config",      CmdLFSetConfig,     0, "Set config for LF sampling, bit/sample, decimation, frequency"},
        {"flexdemod",   CmdFlexdemod,       1, "Demodulate samples for FlexPass"},
        {"indalademod", CmdIndalaDemod,     1, "['224'] -- Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
        {"indalaclone", CmdIndalaClone,     0, "<UID> ['l']-- Clone Indala to T55x7 (tag must be in antenna)(UID in HEX)(option 'l' for 224 UID"},
        {"read",        CmdLFRead,          0, "['s' silent] Read 125/134 kHz LF ID-only tag. Do 'lf read h' for help"},
        {"search",      CmdLFfind,          1, "[offline] ['u'] Read and Search for valid known tag (in offline mode it you can load first then search) - 'u' to search for unknown tags"},
        {"sim",         CmdLFSim,           0, "[GAP] -- Simulate LF tag from buffer with optional GAP (in microseconds)"},
        {"simask",      CmdLFaskSim,        0, "[clock] [invert <1|0>] [biphase/manchester/raw <'b'|'m'|'r'>] [msg separator 's'] [d <hexdata>] -- Simulate LF ASK tag from demodbuffer or input"},
        {"simfsk",      CmdLFfskSim,        0, "[c <clock>] [i] [H <fcHigh>] [L <fcLow>] [d <hexdata>] -- Simulate LF FSK tag from demodbuffer or input"},
        {"simpsk",      CmdLFpskSim,        0, "[1|2|3] [c <clock>] [i] [r <carrier>] [d <raw hex to sim>] -- Simulate LF PSK tag from demodbuffer or input"},
        {"simbidir",    CmdLFSimBidir,      0, "Simulate LF tag (with bidirectional data transmission between reader and tag)"},
        {"snoop",       CmdLFSnoop,         0, "['l'|'h'|<divisor>] [trigger threshold]-- Snoop LF (l:125khz, h:134khz)"},
        {"vchdemod",    CmdVchDemod,        1, "['clone'] -- Demodulate samples for VeriChip"},
        {NULL, NULL, 0, NULL}
};

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

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