X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/be2d41b73a10f52c319dcf2c0664ff071fb753f1..9983a929430904ddeb18ec3aded0afad964272ba:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 91572563..115d4b18 100644
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -253,20 +253,17 @@ uint32_t SnoopLF()
 * acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds
 * the data is collected in BigBuf.
 **/
-void doT55x7Acquisition(void){
+void doT55x7Acquisition(size_t sample_size) {
 
-	#define T55xx_SAMPLES_SIZE 12000 // 32 x 32 x 10  (32 bit times numofblock (7), times clock skip..)
-	#define T55xx_READ_UPPER_THRESHOLD 128+40  // 50
+	#define T55xx_READ_UPPER_THRESHOLD 128+40  // 40 grph
 	#define T55xx_READ_TOL   5
 
 	uint8_t *dest = BigBuf_get_addr();
 	uint16_t bufsize = BigBuf_max_traceLen();
 	
-	if ( bufsize > T55xx_SAMPLES_SIZE )
-		bufsize = T55xx_SAMPLES_SIZE;
+	if ( bufsize > sample_size )
+		bufsize = sample_size;
 
-	//memset(dest, 0, bufsize);
-		
 	uint16_t i = 0;
 	bool startFound = false;
 	bool highFound = false;
@@ -283,7 +280,7 @@ void doT55x7Acquisition(void){
 			curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 			LED_D_OFF();
 
-			// find first high sample
+			// skip until the first high sample above threshold
 			if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
 				if (curSample > firstSample) 
 					firstSample = curSample;
@@ -293,15 +290,17 @@ void doT55x7Acquisition(void){
 				continue;
 			}
 
-			// skip until samples begin to change
+			// skip until first high samples begin to change
 			if (startFound || curSample < firstSample-T55xx_READ_TOL){
-				if (!startFound) 
+				// if just found start - recover last sample
+				if (!startFound) {
 					dest[i++] = firstSample;
-				startFound = true;
+					startFound = true;
+				}
+				// collect samples
 				dest[i++] = curSample;
 				if (i >= bufsize-1) break;
 			}
 		}
-		//skipCnt++;
 	}
 }