Fido U2F complete (#716)

[proxmark3-svn] / armsrc / lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 04c4211662c34acf088c5e1d42b54aa2324679be..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.
-       FpgaSetupSsc();
+       FpgaSetupSsc(FPGA_MAJOR_MODE_LF_ADC);
 }
 
 /**
@@ -119,7 +119,7 @@ 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.
  */
-uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold, bool silent, int bufsize)
+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();
@@ -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 cancel_counter = 0;
 
        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 
-                       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;
-               
+                       }
                        trigger_threshold = 0;
                        sample_total_numbers++;
 
@@ -213,37 +218,38 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
  */
 uint32_t DoAcquisition_default(int trigger_threshold, bool silent)
 {
-       return DoAcquisition(1,8,0,trigger_threshold,silent,0);
+       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
                                  ,silent
+                                 ,sample_size
                                  ,0);
 }
 
-uint32_t DoPartialAcquisition(int trigger_threshold, bool silent, int sample_size) {
-       return DoAcquisition(1,8,0,trigger_threshold,silent,sample_size);
+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)
+uint32_t ReadLF(bool activeField, bool silent, int sample_size)
 {
        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
 **/
-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;
 }
@@ -254,13 +260,13 @@ uint32_t SampleLF(bool printCfg)
 
 uint32_t SnoopLF()
 {
-       uint32_t ret = ReadLF(false, true);
+       uint32_t ret = ReadLF(false, true, 0);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        return ret;
 }
 
 /**
-* 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
@@ -329,8 +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;
-
-       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;
@@ -343,14 +349,20 @@ uint32_t doCotagAcquisitionManchester() {
 
                        // find first peak
                        if ( !firsthigh ) {
-                               if (sample < COTAG_ONE_THRESHOLD) 
+                               if (sample < COTAG_ONE_THRESHOLD) {
+                                       noise_counter++;
                                        continue;
+                               }
+                               noise_counter = 0;
                                firsthigh = 1;
                        }
 
                        if ( !firstlow ){
-                               if (sample > COTAG_ZERO_THRESHOLD )
+                               if (sample > COTAG_ZERO_THRESHOLD ) {
+                                       noise_counter++;
                                        continue;
+                               }
+                               noise_counter=0;
                                firstlow = 1;
                        }