fix lf get sample bits vs bytes bug

[proxmark3-svn] / armsrc / lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index e04467698b7630ca76ecb2b7dc9be88032aa6a40..5d1f9248284fa77b04de411de76fbaaadc113659 100644 (file)
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -10,8 +10,9 @@
 #include "apps.h"
 #include "util.h"
 #include "string.h"
 #include "apps.h"
 #include "util.h"
 #include "string.h"

-

 #include "lfsampling.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 } ;
 
 
 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.
  */
  * @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();
 {
        //.
        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;
 
        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 ;
 
        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;
                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)
 {
  */
 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
 {
        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
 {
        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)

 {
 {

-       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.
 }
 /**
 * Initializes the FPGA for snoop-mode (field off), and acquires the samples.


@@ -246,58 +254,129 @@ uint32_t SampleLF(bool printCfg)
 
 uint32_t SnoopLF()
 {
 
 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(void){
-
-       #define T55xx_SAMPLES_SIZE 12000 // 32 x 32 x 10  (32 bit times numofblock (7), times clock skip..)
-       #define T55xx_READ_UPPER_THRESHOLD 128+40  // 50
-       #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();
        
 
        uint8_t *dest = BigBuf_get_addr();
        uint16_t bufsize = BigBuf_max_traceLen();
        

-       if ( bufsize > T55xx_SAMPLES_SIZE )
-               bufsize = T55xx_SAMPLES_SIZE;
+       if ( bufsize > sample_size )
+               bufsize = sample_size;

 
 

-       //memset(dest, 0, bufsize);
-               
+       dest[0] = 0;
+       uint8_t sample = 0, firsthigh = 0, firstlow = 0; 

        uint16_t i = 0;
        uint16_t i = 0;

-       bool startFound = false;
-       bool highFound = false;
-       uint8_t curSample = 0;
-       uint8_t firstSample = 0;
-       for(;;) {
+
+       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_TXRDY) {
                        AT91C_BASE_SSC->SSC_THR = 0x43;
                        LED_D_ON();
                }

+               

                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {

-                       curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-                       
-                       // find first high sample
-                       if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
-                               if (curSample > firstSample) 
-                                       firstSample = curSample;
-                               highFound = true;
-                       } else if (!highFound) {
-                               continue;
+                       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 samples begin to change
-                       if (startFound || curSample < firstSample-T55xx_READ_TOL){
-                               if (!startFound) 
-                                       dest[i++] = firstSample;
-                               startFound = true;
-                               dest[i++] = curSample;
+                       ++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();
                        LED_D_OFF();

-                       if (i >= bufsize) break;
+
+                       // find first peak
+                       if ( !firsthigh ) {
+                               if (sample < COTAG_ONE_THRESHOLD) 
+                                       continue;
+                               firsthigh = 1;

                        }
                        }

+
+                       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;
+                       }
+
+                       // full T1 periods, 
+                       if ( period > 0 ) {
+                               --period;
+                               continue;
+                       }
+
+                       dest[sample_counter] = curr;
+                       ++sample_counter;
+                       period = COTAG_T1;

                }
        }
                }
        }

+       return sample_counter;

 }
 }