CHG: used @marshmellow42 's version to fix lf continuous demod problems.

[proxmark3-svn] / armsrc / lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 7af065ea141bb2f889c20de389000f93a8716094..94ddc7274d9ae98add2e56ca01158724b4bc9acc 100644 (file)
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -6,18 +6,12 @@
 // Miscellaneous routines for low frequency sampling.
 //-----------------------------------------------------------------------------
 
 // Miscellaneous routines for low frequency sampling.
 //-----------------------------------------------------------------------------
 

-#include "proxmark3.h"
-#include "apps.h"
-#include "util.h"
-#include "string.h"
-

 #include "lfsampling.h"
 #include "lfsampling.h"

-#include "cipherutils.h"
+

 sample_config config = { 1, 8, 1, 95, 0 } ;
 
 sample_config config = { 1, 8, 1, 95, 0 } ;
 

-void printConfig()
-{
-       Dbprintf("Sampling config: ");
+void printConfig() {
+       Dbprintf("LF Sampling config: ");

        Dbprintf("  [q] divisor:           %d ", config.divisor);
        Dbprintf("  [b] bps:               %d ", config.bits_per_sample);
        Dbprintf("  [d] decimation:        %d ", config.decimation);
        Dbprintf("  [q] divisor:           %d ", config.divisor);
        Dbprintf("  [b] bps:               %d ", config.bits_per_sample);
        Dbprintf("  [d] decimation:        %d ", config.decimation);


@@ -37,46 +31,42 @@ void printConfig()
  * @brief setSamplingConfig
  * @param sc
  */
  * @brief setSamplingConfig
  * @param sc
  */

-void setSamplingConfig(sample_config *sc)
-{
+void setSamplingConfig(sample_config *sc) {

        if(sc->divisor != 0) config.divisor = sc->divisor;
        if(sc->divisor != 0) config.divisor = sc->divisor;

-       if(sc->bits_per_sample!= 0) config.bits_per_sample= sc->bits_per_sample;
-       if(sc->decimation!= 0) config.decimation= sc->decimation;
-       if(sc->trigger_threshold != -1) config.trigger_threshold= sc->trigger_threshold;
+       if(sc->bits_per_sample != 0) config.bits_per_sample = sc->bits_per_sample;
+       if(sc->decimation != 0) config.decimation = sc->decimation;
+       if(sc->trigger_threshold != -1) config.trigger_threshold = sc->trigger_threshold;

 
 

-       config.averaging= sc->averaging;
+       config.averaging = sc->averaging;

        if(config.bits_per_sample > 8)  config.bits_per_sample = 8;
        if(config.decimation < 1)       config.decimation = 1;
 
        printConfig();
 }
 
        if(config.bits_per_sample > 8)  config.bits_per_sample = 8;
        if(config.decimation < 1)       config.decimation = 1;
 
        printConfig();
 }
 

-sample_config* getSamplingConfig()
-{
+sample_config* getSamplingConfig() {

        return &config;
 }
        return &config;
 }

-/*
+

 typedef struct {
        uint8_t * buffer;
        uint32_t numbits;
        uint32_t position;
 } BitstreamOut;
 
 typedef struct {
        uint8_t * buffer;
        uint32_t numbits;
        uint32_t position;
 } BitstreamOut;
 

-*/

 /**
  * @brief Pushes bit onto the stream
  * @param stream
  * @param bit
  */
 /**
  * @brief Pushes bit onto the stream
  * @param stream
  * @param bit
  */

-/*void pushBit( BitstreamOut* stream, uint8_t bit)
-{
+void pushBit( BitstreamOut* stream, uint8_t bit) {

        int bytepos = stream->position >> 3; // divide by 8
        int bitpos = stream->position & 7;
        *(stream->buffer+bytepos) |= (bit > 0) <<  (7 - bitpos);
        stream->position++;
        stream->numbits++;
 }
        int bytepos = stream->position >> 3; // divide by 8
        int bitpos = stream->position & 7;
        *(stream->buffer+bytepos) |= (bit > 0) <<  (7 - bitpos);
        stream->position++;
        stream->numbits++;
 }

-*/
+

 /**
 * Setup the FPGA to listen for samples. This method downloads the FPGA bitstream
 * if not already loaded, sets divisor and starts up the antenna.
 /**
 * Setup the FPGA to listen for samples. This method downloads the FPGA bitstream
 * if not already loaded, sets divisor and starts up the antenna.


@@ -84,8 +74,7 @@ typedef struct {
 *                                 0 or 95 ==> 125 KHz
 *
 **/
 *                                 0 or 95 ==> 125 KHz
 *
 **/

-void LFSetupFPGAForADC(int divisor, bool lf_field)
-{
+void LFSetupFPGAForADC(int divisor, bool lf_field) {

        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        if ( (divisor == 1) || (divisor < 0) || (divisor > 255) )
                FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        if ( (divisor == 1) || (divisor < 0) || (divisor > 255) )
                FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz


@@ -98,13 +87,14 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
 
        // Connect the A/D to the peak-detected low-frequency path.
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
 
        // Connect the A/D to the peak-detected low-frequency path.
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);

-       // Give it a bit of time for the resonant antenna to settle.
+       // 50ms 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();
        SpinDelay(50);
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        FpgaSetupSsc();

+       // start a 1.5ticks is 1us
+       StartTicks();

 }
 
 }
 

-

 /**
  * Does the sample acquisition. If threshold is specified, the actual sampling
  * is not commenced until the threshold has been reached.
 /**
  * Does the sample acquisition. If threshold is specified, the actual sampling
  * is not commenced until the threshold has been reached.


@@ -120,14 +110,12 @@ 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) {
+       //bigbuf, to hold the aquired raw data signal

        uint8_t *dest = BigBuf_get_addr();
        uint8_t *dest = BigBuf_get_addr();

-    int bufsize = BigBuf_max_traceLen();
+    uint16_t bufsize = BigBuf_max_traceLen();

 
 

-       memset(dest, 0, bufsize);
+       //BigBuf_Clear_ext(false);        //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;


@@ -143,7 +131,7 @@ 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;


@@ -152,7 +140,8 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
                        sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        LED_D_OFF();
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
                        sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        LED_D_OFF();

-                       if (trigger_threshold > 0 && sample < trigger_threshold)
+                       // threshold either high or low values 128 = center 0.  if trigger = 178 
+                       if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) // 

                                continue;
 
                        trigger_threshold = 0;
                                continue;
 
                        trigger_threshold = 0;


@@ -212,12 +201,10 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
  * @param silent
  * @return number of bits sampled
  */
  * @param silent
  * @return number of bits sampled
  */

-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);
 }

-uint32_t DoAcquisition_config( bool silent)
-{
+uint32_t DoAcquisition_config( bool silent) {

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


@@ -225,28 +212,90 @@ uint32_t DoAcquisition_config( bool silent)
                                  ,silent);
 }
 
                                  ,silent);
 }
 

-uint32_t ReadLF(bool activeField)
-{
-       printConfig();
+uint32_t ReadLF(bool activeField, bool silent) {
+       if (!silent)
+               printConfig();

        LFSetupFPGAForADC(config.divisor, activeField);
        LFSetupFPGAForADC(config.divisor, activeField);

-       // Now call the acquisition routine
-       return DoAcquisition_config(false);
+       return DoAcquisition_config(silent);

 }
 
 /**
 * 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()
-{
-       return ReadLF(true);
+uint32_t SampleLF(bool printCfg) {
+       return ReadLF(true, printCfg);

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

+uint32_t SnoopLF() {
+       return ReadLF(false, true);
+}
+
+/**
+* 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) {

 
 

-uint32_t SnoopLF()
-{
-       return ReadLF(false);
+       #define T55xx_READ_UPPER_THRESHOLD 128+40  // 60 grph
+       #define T55xx_READ_LOWER_THRESHOLD 128-40  // -60 grph
+       #define T55xx_READ_TOL   2
+       
+       uint8_t *dest = BigBuf_get_addr();
+       uint16_t bufsize = BigBuf_max_traceLen();
+       
+       if ( bufsize > sample_size )
+               bufsize = sample_size;
+
+       uint8_t curSample = 0, lastSample = 0;
+       uint16_t i = 0, skipCnt = 0;
+       bool startFound = false;
+       bool highFound = false;
+       bool lowFound = false;
+               
+       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;
+                       }
+               }
+       }

 }
 }

+                       
\ No newline at end of file