auth 14443-4 (#692)

[proxmark3-svn] / armsrc / lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 72aabe00fda46318b1959d93c5150e626a1a8d9a..ffbc0da875ebe11e683fe9426b9c0630e39335ee 100644 (file)
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -101,7 +101,7 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
        // Give it a bit of time for the resonant antenna to settle.
        SpinDelay(50);
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        // Give it a bit of time for the resonant antenna to settle.
        SpinDelay(50);
        // Now set up the SSC to get the ADC samples that are now streaming at us.

-       FpgaSetupSsc();
+       FpgaSetupSsc(FPGA_MAJOR_MODE_LF_ADC);

 }
 
 /**
 }
 
 /**


@@ -119,11 +119,11 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
  * @param silent - is true, now outputs are made. If false, dbprints the status
  * @return the number of bits occupied by the samples.
  */
  * @param silent - is true, now outputs are made. If false, dbprints the status
  * @return the number of bits occupied by the samples.
  */

-uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold, bool silent)
+uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold, bool silent, int bufsize, int cancel_after)

 {
        //.
        uint8_t *dest = BigBuf_get_addr();
 {
        //.
        uint8_t *dest = BigBuf_get_addr();

-    int bufsize = BigBuf_max_traceLen();
+       bufsize = (bufsize > 0 && bufsize < BigBuf_max_traceLen()) ? bufsize : BigBuf_max_traceLen();

 
        //memset(dest, 0, bufsize); //creates issues with cmdread (marshmellow)
 
 
        //memset(dest, 0, bufsize); //creates issues with cmdread (marshmellow)
 


@@ -140,6 +140,7 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
        uint32_t sample_sum =0 ;
        uint32_t sample_total_numbers =0 ;
        uint32_t sample_total_saved =0 ;
        uint32_t sample_sum =0 ;
        uint32_t sample_total_numbers =0 ;
        uint32_t sample_total_saved =0 ;

+       uint32_t cancel_counter = 0;

 
        while(!BUTTON_PRESS() && !usb_poll_validate_length() ) {
                WDT_HIT();
 
        while(!BUTTON_PRESS() && !usb_poll_validate_length() ) {
                WDT_HIT();


@@ -151,9 +152,13 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
                        sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        LED_D_OFF();
                        // threshold either high or low values 128 = center 0.  if trigger = 178 
                        sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        LED_D_OFF();
                        // threshold either high or low values 128 = center 0.  if trigger = 178 

-                       if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) // 
+                       if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) { // 
+                               if (cancel_after > 0) {
+                                       cancel_counter++;
+                                       if (cancel_after == cancel_counter) break;
+                               }

                                continue;
                                continue;

-               
+                       }

                        trigger_threshold = 0;
                        sample_total_numbers++;
 
                        trigger_threshold = 0;
                        sample_total_numbers++;
 


@@ -213,32 +218,38 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
  */
 uint32_t DoAcquisition_default(int trigger_threshold, bool silent)
 {
  */
 uint32_t DoAcquisition_default(int trigger_threshold, bool silent)
 {

-       return DoAcquisition(1,8,0,trigger_threshold,silent);
+       return DoAcquisition(1,8,0,trigger_threshold,silent,0,0);

 }
 }

-uint32_t DoAcquisition_config( bool silent)
+uint32_t DoAcquisition_config(bool silent, int sample_size)

 {
        return DoAcquisition(config.decimation
                                  ,config.bits_per_sample
                                  ,config.averaging
                                  ,config.trigger_threshold
 {
        return DoAcquisition(config.decimation
                                  ,config.bits_per_sample
                                  ,config.averaging
                                  ,config.trigger_threshold

-                                 ,silent);
+                                 ,silent
+                                 ,sample_size
+                                 ,0);

 }
 
 }
 

-uint32_t ReadLF(bool activeField, bool silent)
+uint32_t DoPartialAcquisition(int trigger_threshold, bool silent, int sample_size, int cancel_after) {
+       return DoAcquisition(1,8,0,trigger_threshold,silent,sample_size,cancel_after);
+}
+
+uint32_t ReadLF(bool activeField, bool silent, int sample_size)

 {
        if (!silent) printConfig();
        LFSetupFPGAForADC(config.divisor, activeField);
        // Now call the acquisition routine
 {
        if (!silent) printConfig();
        LFSetupFPGAForADC(config.divisor, activeField);
        // Now call the acquisition routine

-       return DoAcquisition_config(silent);
+       return DoAcquisition_config(silent, sample_size);

 }
 
 /**
 * Initializes the FPGA for reader-mode (field on), and acquires the samples.
 * @return number of bits sampled
 **/
 }
 
 /**
 * Initializes the FPGA for reader-mode (field on), and acquires the samples.
 * @return number of bits sampled
 **/

-uint32_t SampleLF(bool printCfg)
+uint32_t SampleLF(bool printCfg, int sample_size)

 {
 {

-       uint32_t ret = ReadLF(true, printCfg);
+       uint32_t ret = ReadLF(true, printCfg, sample_size);

        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        return ret;
 }
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        return ret;
 }


@@ -249,80 +260,13 @@ uint32_t SampleLF(bool printCfg)
 
 uint32_t SnoopLF()
 {
 
 uint32_t SnoopLF()
 {

-       uint32_t ret = ReadLF(false, true);
+       uint32_t ret = ReadLF(false, true, 0);

        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        return ret;
 }
 
 /**
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        return ret;
 }
 
 /**

-* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds
-* the data is collected in BigBuf.
-**/
-void doT55x7Acquisition(size_t sample_size) {
-
-       #define T55xx_READ_UPPER_THRESHOLD 128+60  // 60 grph
-       #define T55xx_READ_LOWER_THRESHOLD 128-60  // -60 grph
-       #define T55xx_READ_TOL   5
-
-       uint8_t *dest = BigBuf_get_addr();
-       uint16_t bufsize = BigBuf_max_traceLen();
-       
-       if ( bufsize > sample_size )
-               bufsize = sample_size;
-
-       uint16_t i = 0;
-       bool startFound = false;
-       bool highFound = false;
-       bool lowFound = false;
-       uint8_t curSample = 0;
-       uint8_t lastSample = 0;
-       uint16_t skipCnt = 0;
-       while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt<1000 && i<bufsize ) {
-               WDT_HIT();
-               if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
-                       AT91C_BASE_SSC->SSC_THR = 0x43;
-                       LED_D_ON();
-               }
-               if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
-                       curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-                       LED_D_OFF();
-
-                       // skip until the first high sample above threshold
-                       if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
-                               //if (curSample > lastSample) 
-                               //      lastSample = curSample;
-                               highFound = true;
-                       } else if (!highFound) {
-                               skipCnt++;
-                               continue;
-                       }
-                       // skip until the first Low sample below threshold
-                       if (!startFound && curSample < T55xx_READ_LOWER_THRESHOLD) {
-                               //if (curSample > lastSample) 
-                               lastSample = curSample;
-                               lowFound = true;
-                       } else if (!lowFound) {
-                               skipCnt++;
-                               continue;
-                       }
-
-
-                       // skip until first high samples begin to change
-                       if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD+T55xx_READ_TOL){
-                               // if just found start - recover last sample
-                               if (!startFound) {
-                                       dest[i++] = lastSample;
-                                       startFound = true;
-                               }
-                               // collect samples
-                               dest[i++] = curSample;
-                       }
-               }
-       }
-}
-
-/**
-* acquisition of Cotag LF signal. Similart to other LF,  since the Cotag has such long datarate RF/384
+* acquisition of Cotag LF signal. Similar to other LF,  since the Cotag has such long datarate RF/384

 * and is Manchester?,  we directly gather the manchester data into bigbuff
 **/
 #define COTAG_T1 384
 * and is Manchester?,  we directly gather the manchester data into bigbuff
 **/
 #define COTAG_T1 384


@@ -391,8 +335,8 @@ uint32_t doCotagAcquisitionManchester() {
        uint8_t sample = 0, firsthigh = 0, firstlow = 0; 
        uint16_t sample_counter = 0, period = 0;
        uint8_t curr = 0, prev = 0;
        uint8_t sample = 0, firsthigh = 0, firstlow = 0; 
        uint16_t sample_counter = 0, period = 0;
        uint8_t curr = 0, prev = 0;

-
-       while (!BUTTON_PRESS() && !usb_poll_validate_length() && (sample_counter < bufsize) ) {
+       uint16_t noise_counter = 0;
+       while (!BUTTON_PRESS() && !usb_poll_validate_length() && (sample_counter < bufsize) && (noise_counter < (COTAG_T1<<1)) ) {

                WDT_HIT();
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
                        AT91C_BASE_SSC->SSC_THR = 0x43;
                WDT_HIT();
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
                        AT91C_BASE_SSC->SSC_THR = 0x43;


@@ -405,14 +349,20 @@ uint32_t doCotagAcquisitionManchester() {
 
                        // find first peak
                        if ( !firsthigh ) {
 
                        // find first peak
                        if ( !firsthigh ) {

-                               if (sample < COTAG_ONE_THRESHOLD) 
+                               if (sample < COTAG_ONE_THRESHOLD) {
+                                       noise_counter++;

                                        continue;
                                        continue;

+                               }
+                               noise_counter = 0;

                                firsthigh = 1;
                        }
 
                        if ( !firstlow ){
                                firsthigh = 1;
                        }
 
                        if ( !firstlow ){

-                               if (sample > COTAG_ZERO_THRESHOLD )
+                               if (sample > COTAG_ZERO_THRESHOLD ) {
+                                       noise_counter++;

                                        continue;
                                        continue;

+                               }
+                               noise_counter=0;

                                firstlow = 1;
                        }
 
                                firstlow = 1;
                        }