X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/9f669cb26f4266c4a221af39635899ac60bbc179..709665b5d1abddd92403082c23f13e8cddfcd508:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 115d4b18..b6ca9209 100644
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -255,7 +255,8 @@ 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();
@@ -267,8 +268,9 @@ 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() && skipCnt<1000) {
 		WDT_HIT();
@@ -282,19 +284,29 @@ 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;
+					dest[i++] = lastSample;
 					startFound = true;
 				}
 				// collect samples