CHG: Updated the README.md

[proxmark3-svn] / armsrc / lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 6eecf4075ebf82a94cd6324e3afb4721e76376e2..8a6e6b052f72c04d2d4fa9f782fe435ceb6172e6 100644 (file)
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -10,7 +10,7 @@
 #include "apps.h"
 #include "util.h"
 #include "string.h"
-
+#include "usb_cdc.h" // for usb_poll_validate_length
 #include "lfsampling.h"
 
 sample_config config = { 1, 8, 1, 95, 0 } ;
@@ -40,11 +40,11 @@ void printConfig()
 void setSamplingConfig(sample_config *sc)
 {
        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;
 
@@ -103,7 +103,6 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
        FpgaSetupSsc();
 }
 
-
 /**
  * Does the sample acquisition. If threshold is specified, the actual sampling
  * is not commenced until the threshold has been reached.
@@ -125,7 +124,7 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
        uint8_t *dest = BigBuf_get_addr();
     uint16_t bufsize = BigBuf_max_traceLen();
 
-       BigBuf_Clear_ext(false);
+       //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;
@@ -254,7 +253,8 @@ uint32_t SnoopLF() {
 **/
 void doT55x7Acquisition(size_t sample_size) {
 
-       #define T55xx_READ_UPPER_THRESHOLD 128+40  // 40 grph
+       #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();
@@ -266,10 +266,11 @@ void doT55x7Acquisition(size_t sample_size) {
        uint16_t i = 0;
        bool startFound = false;
        bool highFound = false;
+       bool lowFound = false;
        uint8_t curSample = 0;
-       uint8_t firstSample = 0;
+       uint8_t lastSample = 0;
        uint16_t skipCnt = 0;
-       while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt<1000) {
+       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;
@@ -281,24 +282,33 @@ void doT55x7Acquisition(size_t sample_size) {
                
                        // skip until the first high sample above threshold
                        if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
-                               if (curSample > firstSample) 
-                                       firstSample = curSample;
+                               //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 < firstSample-T55xx_READ_TOL){
+                       if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD+T55xx_READ_TOL){
                                // if just found start - recover last sample
                                if (!startFound) {
-                                       dest[i++] = firstSample;
-                               startFound = true;
+                                       dest[i++] = lastSample;
+                                       startFound = true;
                                }
                                // collect samples
                                dest[i++] = curSample;
-                               if (i >= bufsize-1) break;
                        }
                }
        }