X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/edaf10af99156022f7719c6853812005579c8726..6063655a3ca719d224c61ece09645cedd5b4818c:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 6eecf407..8a6e6b05 100644
--- 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;
 			}
 		}
 	}