CHG: iso14443b.c got some more love. using the "hf 14b raw" command gives now...

[proxmark3-svn] / armsrc / iso14443b.c

diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c
index e89c3becdd8a8777c91c1dce13dded2003e0775f..be43d47e2cbb8317741acd756573d10f37f0b5c1 100644 (file)
--- a/armsrc/iso14443b.c
+++ b/armsrc/iso14443b.c
@@ -10,15 +10,29 @@
 //-----------------------------------------------------------------------------
 #include "iso14443b.h"
 
 //-----------------------------------------------------------------------------
 #include "iso14443b.h"
 

-#define RECEIVE_SAMPLES_TIMEOUT 50000
-#define ISO14443B_DMA_BUFFER_SIZE 256
+#ifndef FWT_TIMEOUT_14B
+# define FWT_TIMEOUT_14B 60000
+#endif
+#ifndef ISO14443B_DMA_BUFFER_SIZE
+# define ISO14443B_DMA_BUFFER_SIZE 256
+#endif
+#ifndef RECEIVE_MASK
+# define RECEIVE_MASK  (ISO14443B_DMA_BUFFER_SIZE-1)
+#endif

 
 // Guard Time (per 14443-2)
 
 // Guard Time (per 14443-2)

-#define TR0 0  
+#ifndef TR0
+# define TR0 0
+#endif
+

 // Synchronization time (per 14443-2)
 // Synchronization time (per 14443-2)

-#define TR1 0
+#ifndef TR1
+# define TR1 0
+#endif

 // Frame Delay Time PICC to PCD  (per 14443-3 Amendment 1)
 // Frame Delay Time PICC to PCD  (per 14443-3 Amendment 1)

-#define TR2 0
+#ifndef TR2
+# define TR2 0
+#endif

 
 // 4sample
 #define SEND4STUFFBIT(x) ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);
 
 // 4sample
 #define SEND4STUFFBIT(x) ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);


@@ -29,7 +43,7 @@ static void switch_off(void);
 // the block number for the ISO14443-4 PCB  (used with APDUs)
 static uint8_t pcb_blocknum = 0;
 
 // the block number for the ISO14443-4 PCB  (used with APDUs)
 static uint8_t pcb_blocknum = 0;
 

-static uint32_t iso14b_timeout = RECEIVE_SAMPLES_TIMEOUT;
+static uint32_t iso14b_timeout = FWT_TIMEOUT_14B;

 // param timeout is in ftw_ 
 void iso14b_set_timeout(uint32_t timeout) {
        // 9.4395us = 1etu.
 // param timeout is in ftw_ 
 void iso14b_set_timeout(uint32_t timeout) {
        // 9.4395us = 1etu.


@@ -482,31 +496,33 @@ void WaitForFpgaDelayQueueIsEmpty( uint16_t delay ){
 
 static void TransmitFor14443b_AsTag( uint8_t *response, uint16_t len) {
 
 
 static void TransmitFor14443b_AsTag( uint8_t *response, uint16_t len) {
 

-               // Signal field is off with the appropriate LED
-               LED_D_OFF();
-               //uint16_t fpgasendQueueDelay = 0;
-               
-               // Modulate BPSK
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK);
-               
-               ClearFpgaShiftingRegisters();
-               
-               FpgaSetupSsc();
-               volatile uint32_t b;
+       volatile uint32_t b;
+       
+       // Signal field is off with the appropriate LED
+       LED_D_OFF();
+       //uint16_t fpgasendQueueDelay = 0;
+       
+       // Modulate BPSK
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK);
+       SpinDelay(40);
+       
+       ClearFpgaShiftingRegisters();
+       
+       FpgaSetupSsc();

 
 

-               // Transmit the response.
-               for(uint16_t i = 0; i < len;) {
-                       if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
-                               AT91C_BASE_SSC->SSC_THR = response[++i];
-                       }
-                       if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                               b = AT91C_BASE_SSC->SSC_RHR;
-                               (void)b;
-                       }                       
+       // Transmit the response.
+       for(uint16_t i = 0; i < len;) {
+               if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+                       AT91C_BASE_SSC->SSC_THR = response[++i];

                }
                }

-               
-               //WaitForFpgaDelayQueueIsEmpty(fpgasendQueueDelay);
-               AT91C_BASE_SSC->SSC_THR = 0xFF;         
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+                       b = AT91C_BASE_SSC->SSC_RHR;
+                       (void)b;
+               }                       
+       }
+       
+       //WaitForFpgaDelayQueueIsEmpty(fpgasendQueueDelay);
+       AT91C_BASE_SSC->SSC_THR = 0xFF;         

 }      
 //-----------------------------------------------------------------------------
 // Main loop of simulated tag: receive commands from reader, decide what
 }      
 //-----------------------------------------------------------------------------
 // Main loop of simulated tag: receive commands from reader, decide what


@@ -615,10 +631,10 @@ void SimulateIso14443bTag(uint32_t pupi) {
                    send halt response ( waiting for wupb )
                */
                
                    send halt response ( waiting for wupb )
                */
                

-               switch(cardSTATE){
+               switch (cardSTATE) {

                        case SIM_NOFIELD:
                        case SIM_HALTED:
                        case SIM_NOFIELD:
                        case SIM_HALTED:

-                       case SIM_IDLE:{
+                       case SIM_IDLE: {

                                LogTrace(receivedCmd, len, 0, 0, NULL, TRUE);   
                                break;
                        }
                                LogTrace(receivedCmd, len, 0, 0, NULL, TRUE);   
                                break;
                        }


@@ -634,13 +650,13 @@ void SimulateIso14443bTag(uint32_t pupi) {
                                cardSTATE = SIM_HALTED;
                                break;
                        }
                                cardSTATE = SIM_HALTED;
                                break;
                        }

-                       case SIM_ACKNOWLEDGE:{
+                       case SIM_ACKNOWLEDGE: {

                                TransmitFor14443b_AsTag( encodedOK, encodedOKLen );
                                LogTrace(respOK, sizeof(respOK), 0, 0, NULL, FALSE);
                                cardSTATE = SIM_IDLE;                   
                                break;
                        }
                                TransmitFor14443b_AsTag( encodedOK, encodedOKLen );
                                LogTrace(respOK, sizeof(respOK), 0, 0, NULL, FALSE);
                                cardSTATE = SIM_IDLE;                   
                                break;
                        }

-                       case SIM_WORK:{
+                       case SIM_WORK: {

                                if ( len == 7 && receivedCmd[0] == ISO14443B_HALT ) {
                                        cardSTATE = SIM_HALTED;
                                } else if ( len == 11 && receivedCmd[0] == ISO14443B_ATTRIB ) {
                                if ( len == 7 && receivedCmd[0] == ISO14443B_HALT ) {
                                        cardSTATE = SIM_HALTED;
                                } else if ( len == 11 && receivedCmd[0] == ISO14443B_ATTRIB ) {


@@ -669,6 +685,7 @@ void SimulateIso14443bTag(uint32_t pupi) {
                }
                        
                ++cmdsReceived;
                }
                        
                ++cmdsReceived;

+               // iceman, could add a switch to turn this on/off (if off, no logging?)

                if(cmdsReceived > 1000) {
                        DbpString("14B Simulate, 1000 commands later...");
                        break;
                if(cmdsReceived > 1000) {
                        DbpString("14B Simulate, 1000 commands later...");
                        break;


@@ -699,12 +716,13 @@ void SimulateIso14443bTag(uint32_t pupi) {
  *          false if we are still waiting for some more
  *
  */
  *          false if we are still waiting for some more
  *
  */

+ // iceman, this threshold value,  what makes 8 a good amplituted for this IQ values? 

 #ifndef SUBCARRIER_DETECT_THRESHOLD
 #ifndef SUBCARRIER_DETECT_THRESHOLD

-# define SUBCARRIER_DETECT_THRESHOLD   8
+# define SUBCARRIER_DETECT_THRESHOLD   6

 #endif
 
 static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
 #endif
 
 static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {

-       int v=0;// , myI, myQ = 0;
+       int v = 0, myI = 0, myQ = 0;

 // The soft decision on the bit uses an estimate of just the
 // quadrant of the reference angle, not the exact angle.
 #define MAKE_SOFT_DECISION() { \
 // The soft decision on the bit uses an estimate of just the
 // quadrant of the reference angle, not the exact angle.
 #define MAKE_SOFT_DECISION() { \


@@ -722,7 +740,7 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
 
 // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by abs(ci) + abs(cq)
 // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
 
 // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by abs(ci) + abs(cq)
 // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))

-#define CHECK_FOR_SUBCARRIER() { \
+#define CHECK_FOR_SUBCARRIER_old() { \

                if(ci < 0) { \
                        if(cq < 0) { /* ci < 0, cq < 0 */ \
                                if (cq < ci) { \
                if(ci < 0) { \
                        if(cq < 0) { /* ci < 0, cq < 0 */ \
                                if (cq < ci) { \


@@ -755,10 +773,10 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
        }
 
 //note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow
        }
 
 //note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow

-#define CHECK_FOR_SUBCARRIER_un() { \
+#define CHECK_FOR_SUBCARRIER() { \

                myI = ABS(ci); \
                myQ = ABS(cq); \
                myI = ABS(ci); \
                myQ = ABS(cq); \

-               v = MAX(myI,myQ) + (MIN(myI,myQ) >> 1); \
+               v = MAX(myI, myQ) + (MIN(myI, myQ) >> 1); \

        }
 
        switch(Demod.state) {
        }
 
        switch(Demod.state) {


@@ -867,11 +885,12 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
                                Demod.shiftReg >>= 1;
 
                                // logic '1'
                                Demod.shiftReg >>= 1;
 
                                // logic '1'

-                               if(Demod.thisBit > 0)  Demod.shiftReg |= 0x200;
+                               if (Demod.thisBit > 0)  Demod.shiftReg |= 0x200;

 
                                ++Demod.bitCount;
                                
 
                                ++Demod.bitCount;
                                

-                               if(Demod.bitCount == 10) {
+                               // 1 start 8 data 1 stop = 10
+                               if (Demod.bitCount == 10) {

                                        
                                        uint16_t s = Demod.shiftReg;
                                        
                                        
                                        uint16_t s = Demod.shiftReg;
                                        


@@ -908,9 +927,9 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
  *  quiet: set to 'TRUE' to disable debug output
  */
 static void GetTagSamplesFor14443bDemod() {
  *  quiet: set to 'TRUE' to disable debug output
  */
 static void GetTagSamplesFor14443bDemod() {

-       bool gotFrame = FALSE;
+       bool gotFrame = FALSE, finished = FALSE;

        int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
        int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;

-       int max = 0, ci = 0, cq = 0, samples = 0;
+       int ci = 0, cq = 0, samples = 0;

        uint32_t time_0 = 0, time_stop = 0;
 
        BigBuf_free();
        uint32_t time_0 = 0, time_stop = 0;
 
        BigBuf_free();


@@ -927,60 +946,57 @@ static void GetTagSamplesFor14443bDemod() {
                if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting"); 
                return;
        }
                if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting"); 
                return;
        }

-       
-       time_0 = GetCountSspClk();
-       
+

        // And put the FPGA in the appropriate mode
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
        // And put the FPGA in the appropriate mode
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);

-               
-       while( !BUTTON_PRESS() ) {
-               WDT_HIT();

 
 

-               int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR;
-               if(behindBy > max) max = behindBy;
+       // get current clock
+       time_0 = GetCountSspClk();
+       
+       // rx counter - dma counter? (how much?) & (mod) mask > 2. (since 2bytes at the time is read)
+       while ( !finished ) {

 
 

-               // rx counter - dma counter? (how much?) & (mod) dma buff / 2.  (since 2bytes at the time is read)
-               while(((lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1)) > 2) {
+               LED_A_INV();
+               WDT_HIT();

 
 

-                       ci = upTo[0];
-                       cq = upTo[1];
-                       upTo += 2;
-                       samples += 2;
-                       
-                       // restart DMA buffer to receive again.
-                       if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
-                               upTo = dmaBuf;
-                               AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
-                               AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
-                       }
-                       
-                       lastRxCounter -= 2;
-                       if(lastRxCounter <= 0)
-                               lastRxCounter += ISO14443B_DMA_BUFFER_SIZE;
+               // LSB is a fpga signal bit.
+               ci = upTo[0] >> 1;
+               cq = upTo[1] >> 1;
+               upTo += 2;
+               samples += 2;

 
 

-                       // is this | 0x01 the error?   & 0xfe  in https://github.com/Proxmark/proxmark3/issues/103
-                       //gotFrame =  Handle14443bTagSamplesDemod(ci & 0xfe, cq & 0xfe);
-                       gotFrame =  Handle14443bTagSamplesDemod(ci, cq);
-                       if ( gotFrame ) break;
-                       LED_A_INV();
+               lastRxCounter -= 2;
+
+               // restart DMA buffer to receive again.
+               if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
+                       upTo = dmaBuf;
+                       lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
+                       AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
+                       AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;

                }
 
                }
 

+               // https://github.com/Proxmark/proxmark3/issues/103
+               //gotFrame =  Handle14443bTagSamplesDemod(ci & 0xfe, cq & 0xfe);
+               gotFrame =  Handle14443bTagSamplesDemod(ci, cq);

                time_stop = GetCountSspClk() - time_0;
                time_stop = GetCountSspClk() - time_0;

-       
-               if(time_stop > iso14b_timeout || gotFrame)      break;
+
+               finished = (time_stop > iso14b_timeout || gotFrame);

        }
        
        FpgaDisableSscDma();
 
        if (MF_DBGLEVEL >= 3) {
        }
        
        FpgaDisableSscDma();
 
        if (MF_DBGLEVEL >= 3) {

-               Dbprintf("max behindby = %d, samples = %d, gotFrame = %s, Demod.state = %d, Demod.len = %u",
-                       max,
-                       samples, 
-                       (gotFrame) ? "true" : "false", 
+               Dbprintf("time_stop = %u PDC_RCR = %u", time_stop,  AT91C_BASE_PDC_SSC->PDC_RCR);
+               Dbprintf("#Samples = %d, Demod.state = %d, Demod.len = %u",
+                       samples,                        

                        Demod.state,
                        Demod.len
                );
        }
                        Demod.state,
                        Demod.len
                );
        }

+       
+       if (MF_DBGLEVEL == 4)
+               Dbhexdump(ISO14443B_DMA_BUFFER_SIZE, (uint8_t *)dmaBuf, FALSE); 
+       

        if ( Demod.len > 0 )
                LogTrace(Demod.output, Demod.len, Demod.startTime, Demod.endTime, NULL, FALSE);
 }
        if ( Demod.len > 0 )
                LogTrace(Demod.output, Demod.len, Demod.startTime, Demod.endTime, NULL, FALSE);
 }


@@ -1534,11 +1550,19 @@ void RAMFUNC SnoopIso14443b(void) {
 
                WDT_HIT();
                
 
                WDT_HIT();
                

-               int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1);
+               /* iceman: the & (and) should do what?
+                       ISO14443B_DMA_BUFFER_SIZE = 256
+                       Should it be a "mod 255" ?
+                       
+                (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1);
+                
+               */
+               int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & RECEIVE_MASK;

 
                if ( behindBy > maxBehindBy )
                        maxBehindBy = behindBy;
                
 
                if ( behindBy > maxBehindBy )
                        maxBehindBy = behindBy;
                

+               // this one needs the inner loop from tr

                if ( behindBy < 2 ) continue;
                
                ci = upTo[0];
                if ( behindBy < 2 ) continue;
                
                ci = upTo[0];


@@ -1549,14 +1573,14 @@ void RAMFUNC SnoopIso14443b(void) {
                
                if (upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
                        upTo = dmaBuf;
                
                if (upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
                        upTo = dmaBuf;

-                       lastRxCounter += ISO14443B_DMA_BUFFER_SIZE;
+                       lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;

                        AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
                        AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
                        WDT_HIT();
                        
                        // TODO: understand whether we can increase/decrease as we want or not?
                        if ( behindBy > ( 9 * ISO14443B_DMA_BUFFER_SIZE/10) ) { 
                        AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
                        AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
                        WDT_HIT();
                        
                        // TODO: understand whether we can increase/decrease as we want or not?
                        if ( behindBy > ( 9 * ISO14443B_DMA_BUFFER_SIZE/10) ) { 

-                               Dbprintf("blew circular buffer! behindBy=%d", behindBy);
+                               Dbprintf("blew circular buffer! behindBy = %d", behindBy);

                                break;
                        }
                        
                                break;
                        }
                        


@@ -1578,7 +1602,7 @@ void RAMFUNC SnoopIso14443b(void) {
                        // no need to try decoding reader data if the tag is sending
                        if (Handle14443bReaderUartBit(ci & 0x01)) {
 
                        // no need to try decoding reader data if the tag is sending
                        if (Handle14443bReaderUartBit(ci & 0x01)) {
 

-                               time_stop = (GetCountSspClk()-time_0);
+                               time_stop = GetCountSspClk() - time_0;

                                
                                if (triggered)
                                        LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE);
                                
                                if (triggered)
                                        LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE);


@@ -1589,12 +1613,12 @@ void RAMFUNC SnoopIso14443b(void) {
                                /* false-triggered by the commands from the reader. */
                                DemodReset();
                        } else {
                                /* false-triggered by the commands from the reader. */
                                DemodReset();
                        } else {

-                               time_start = (GetCountSspClk()-time_0);
+                               time_start = GetCountSspClk() - time_0;

                        }
                        
                        if (Handle14443bReaderUartBit(cq & 0x01)) {
                                
                        }
                        
                        if (Handle14443bReaderUartBit(cq & 0x01)) {
                                

-                               time_stop = (GetCountSspClk()-time_0);
+                               time_stop = GetCountSspClk() - time_0;

                                
                                if (triggered)
                                        LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE);
                                
                                if (triggered)
                                        LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE);


@@ -1605,7 +1629,7 @@ void RAMFUNC SnoopIso14443b(void) {
                                        /* false-triggered by the commands from the reader. */
                                        DemodReset();
                        } else {
                                        /* false-triggered by the commands from the reader. */
                                        DemodReset();
                        } else {

-                               time_start = (GetCountSspClk()-time_0);
+                               time_start = GetCountSspClk() - time_0;

                        }
                        ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF);
                        LED_A_OFF();
                        }
                        ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF);
                        LED_A_OFF();


@@ -1616,7 +1640,7 @@ void RAMFUNC SnoopIso14443b(void) {
                        // is this | 0x01 the error?   & 0xfe  in https://github.com/Proxmark/proxmark3/issues/103
                        if(Handle14443bTagSamplesDemod(ci & 0xFE, cq & 0xFE)) {
                                
                        // is this | 0x01 the error?   & 0xfe  in https://github.com/Proxmark/proxmark3/issues/103
                        if(Handle14443bTagSamplesDemod(ci & 0xFE, cq & 0xFE)) {
                                

-                               time_stop = (GetCountSspClk()-time_0);
+                               time_stop = GetCountSspClk() - time_0;

                                
                                LogTrace(Demod.output, Demod.len, time_start, time_stop, NULL, FALSE);
 
                                
                                LogTrace(Demod.output, Demod.len, time_start, time_stop, NULL, FALSE);
 


@@ -1625,7 +1649,7 @@ void RAMFUNC SnoopIso14443b(void) {
                                // And ready to receive another response.
                                DemodReset();
                        } else {
                                // And ready to receive another response.
                                DemodReset();
                        } else {

-                               time_start = (GetCountSspClk()-time_0);
+                               time_start = GetCountSspClk() - time_0;

                        }
                        TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF);
                }
                        }
                        TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF);
                }