X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/e2012d1bd33ae33703da1c1648f35964472823be..9983a929430904ddeb18ec3aded0afad964272ba:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 6e783769..115d4b18 100644
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -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.
@@ -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 +248,59 @@ 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+40  // 40 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;
+	uint8_t curSample = 0;
+	uint8_t firstSample = 0;
+	uint16_t skipCnt = 0;
+	while(!BUTTON_PRESS() && skipCnt<1000) {
+		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 > firstSample) 
+					firstSample = curSample;
+				highFound = true;
+			} else if (!highFound) {
+				skipCnt++;
+				continue;
+			}
+
+			// skip until first high samples begin to change
+			if (startFound || curSample < firstSample-T55xx_READ_TOL){
+				// if just found start - recover last sample
+				if (!startFound) {
+					dest[i++] = firstSample;
+					startFound = true;
+				}
+				// collect samples
+				dest[i++] = curSample;
+				if (i >= bufsize-1) break;
+			}
+		}
+	}
+}