+       UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
+       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              TBD- -to enable a gap between playback repetitions - default: no gap");
+       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 ask data given clock, fcHigh, fcLow, invert 
+// - allow pull data from DemodBuffer
+int CmdLFfskSim(const char *Cmd)
+{
+       //might be able to autodetect FC and clock from Graphbuffer if using demod buffer
+       //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);
+       }
+       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);
+       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
+       //will need clock, invert, manchester/raw as m or r, separator as s, and bitstream
+       uint8_t encoding = 1, separator = 0;
+       //char cmdp = Cmd[0], par3='m', par4=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);
+       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);
+       SendCommand(&c);
+       
+       return 0;