X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/368044201a6a4d0802f708b03becf3e49ada37ab..ac2df3460ab2ab2d39fe93350018701699d8327b:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 635934ef..33943421 100644
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -245,7 +245,60 @@ uint32_t SampleLF(bool printCfg)
 * @return number of bits sampled
 **/
 
-uint32_t SnoopLF()
-{
+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(void){
+
+	#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_TOL   5
+	//#define T55xx_READ_LOWER_THRESHOLD 128-40  //-50
+
+	uint8_t *dest = BigBuf_get_addr();
+	uint16_t bufsize = BigBuf_max_traceLen();
+	
+	if ( bufsize > T55xx_SAMPLES_SIZE )
+		bufsize = T55xx_SAMPLES_SIZE;
+
+	memset(dest, 0, bufsize);
+		
+	uint16_t i = 0;
+	bool startFound = false;
+	bool highFound = false;
+	uint8_t curSample = 0;
+	uint8_t firstSample = 0;
+	for(;;) {
+		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;
+			
+			// find first high sample
+			if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
+				if (curSample > firstSample) 
+					firstSample = curSample;
+				highFound = true;
+			} else if (!highFound) {
+				continue;
+			}
+
+			// skip until samples begin to change
+			if (startFound || curSample < firstSample-T55xx_READ_TOL){
+				if (!startFound) 
+					dest[i++] = firstSample;
+				startFound = true;
+				dest[i++] = curSample;
+			LED_D_OFF();
+			if (i >= bufsize) break;
+			}
+		}
+	}
+}
\ No newline at end of file