X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/e2012d1bd33ae33703da1c1648f35964472823be..39d56ec88be1ee4c8d13f1a08aa40daccab273d6:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 6e783769..88df543f 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 } ;
@@ -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();
     int 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;
@@ -154,9 +153,6 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
 			if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) // 
 				continue;
 		
-			//if (trigger_threshold > 0 && sample < trigger_threshold) // 
-				//continue;
-
 			trigger_threshold = 0;
 			sample_total_numbers++;
 
@@ -252,3 +248,70 @@ 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) {
+
+	#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();
+	uint16_t bufsize = BigBuf_max_traceLen();
+	
+	if ( bufsize > sample_size )
+		bufsize = sample_size;
+
+	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() && !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;
+			}
+		}
+	}
+}