]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/lfsampling.c
fix length test
[proxmark3-svn] / armsrc / lfsampling.c
index b6ca920907e220d5ad9a69898f2530fe2970da7c..5d1f9248284fa77b04de411de76fbaaadc113659 100644 (file)
@@ -10,8 +10,9 @@
 #include "apps.h"
 #include "util.h"
 #include "string.h"
-
 #include "lfsampling.h"
+#include "usb_cdc.h"   // for usb_poll_validate_length
+//#include "ticks.h"           // for StartTicks
 
 sample_config config = { 1, 8, 1, 95, 0 } ;
 
@@ -118,13 +119,13 @@ 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)
+uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold, bool silent, int bufsize)
 {
        //.
        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);
+       //memset(dest, 0, bufsize); //creates issues with cmdread (marshmellow)
 
        if(bits_per_sample < 1) bits_per_sample = 1;
        if(bits_per_sample > 8) bits_per_sample = 8;
@@ -140,7 +141,7 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
        uint32_t sample_total_numbers =0 ;
        uint32_t sample_total_saved =0 ;
 
-       while(!BUTTON_PRESS()) {
+       while(!BUTTON_PRESS() && !usb_poll_validate_length() ) {
                WDT_HIT();
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
                        AT91C_BASE_SSC->SSC_THR = 0x43;
@@ -212,32 +213,39 @@ 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);
+       return DoAcquisition(1,8,0,trigger_threshold,silent,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);
+                                 ,silent
+                                 ,sample_size);
+}
+
+uint32_t DoPartialAcquisition(int trigger_threshold, bool silent, int sample_size) {
+       return DoAcquisition(1,8,0,trigger_threshold,silent,sample_size);
 }
 
-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)
 {
-       return ReadLF(true, printCfg);
+       uint32_t ret = ReadLF(true, printCfg, sample_size);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       return ret;
 }
 /**
 * Initializes the FPGA for snoop-mode (field off), and acquires the samples.
@@ -246,18 +254,23 @@ uint32_t SampleLF(bool printCfg)
 
 uint32_t SnoopLF()
 {
-       return ReadLF(false, true);
+       uint32_t ret = ReadLF(false, true, 0);
+       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.
+* acquisition of Cotag LF signal. Similart to other LF,  since the Cotag has such long datarate RF/384
+* and is Manchester?,  we directly gather the manchester data into bigbuff
 **/
-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
+#define COTAG_T1 384
+#define COTAG_T2 (COTAG_T1>>1)
+#define COTAG_ONE_THRESHOLD 128+30
+#define COTAG_ZERO_THRESHOLD 128-30
+#ifndef COTAG_BITS
+#define COTAG_BITS 264
+#endif
+void doCotagAcquisition(size_t sample_size) {
 
        uint8_t *dest = BigBuf_get_addr();
        uint16_t bufsize = BigBuf_max_traceLen();
@@ -265,54 +278,105 @@ void doT55x7Acquisition(size_t sample_size) {
        if ( bufsize > sample_size )
                bufsize = sample_size;
 
+       dest[0] = 0;
+       uint8_t sample = 0, firsthigh = 0, firstlow = 0; 
        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() && skipCnt<1000) {
+
+       while (!BUTTON_PRESS() && !usb_poll_validate_length() && (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;
+                       sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        LED_D_OFF();
+               
+                       // find first peak
+                       if ( !firsthigh ) {
+                               if (sample < COTAG_ONE_THRESHOLD) 
+                                       continue;
+                               firsthigh = 1;
+                       }
+                       if ( !firstlow ){
+                               if (sample > COTAG_ZERO_THRESHOLD )
+                                       continue;
+                               firstlow = 1;
+                       }
 
-                       // 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;
+                       ++i;
+       
+                       if ( sample > COTAG_ONE_THRESHOLD)
+                               dest[i] = 255;
+                       else if ( sample < COTAG_ZERO_THRESHOLD)
+                               dest[i] = 0;
+                       else 
+                               dest[i] = dest[i-1];
+               }
+       }
+}
+
+uint32_t doCotagAcquisitionManchester() {
+
+       uint8_t *dest = BigBuf_get_addr();
+       uint16_t bufsize = BigBuf_max_traceLen();
+       
+       if ( bufsize > COTAG_BITS )
+               bufsize = COTAG_BITS;
+
+       dest[0] = 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) ) {
+               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) {
+                       sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+                       LED_D_OFF();
+
+                       // find first peak
+                       if ( !firsthigh ) {
+                               if (sample < COTAG_ONE_THRESHOLD) 
+                                       continue;
+                               firsthigh = 1;
                        }
-                       // 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;
+
+                       if ( !firstlow ){
+                               if (sample > COTAG_ZERO_THRESHOLD )
+                                       continue;
+                               firstlow = 1;
                        }
 
+                       // set sample 255, 0,  or previous
+                       if ( sample > COTAG_ONE_THRESHOLD){
+                               prev = curr;
+                               curr = 1;
+                       }
+                       else if ( sample < COTAG_ZERO_THRESHOLD) {
+                               prev = curr;
+                               curr = 0;
+                       }
+                       else {
+                               curr = prev;
+                       }
 
-                       // 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;
-                               if (i >= bufsize-1) break;
+                       // full T1 periods, 
+                       if ( period > 0 ) {
+                               --period;
+                               continue;
                        }
+
+                       dest[sample_counter] = curr;
+                       ++sample_counter;
+                       period = COTAG_T1;
                }
        }
+       return sample_counter;
 }
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