From 711d384e7d2f41823467980ad918fcb27507cbde Mon Sep 17 00:00:00 2001
From: Chris <herrmann1001@gmail.com>
Date: Mon, 25 Feb 2019 12:44:21 +0100
Subject: [PATCH] chg: 'data autocorrelate g' - visual with gridclock patter
 and markup of two tops. Also added a "visual" inspection of peaks with 3%
 tolerance. This increases usability quite much.

---
 client/cmddata.c | 48 +++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 41 insertions(+), 7 deletions(-)

diff --git a/client/cmddata.c b/client/cmddata.c
index 65fd0d829..62308c39f 100644
--- a/client/cmddata.c
+++ b/client/cmddata.c
@@ -754,19 +754,53 @@ int AutoCorrelate(const int *in, int *out, size_t len, int window, bool SaveGrph
 			lastmax = i;
 		}
 	}
-
-	if (verbose && ( correlation > 1 ) ) {
-		PrintAndLogEx(SUCCESS, "possible correlation %4d samples", correlation);
-	} else {
-		PrintAndLogEx(FAILED, "no repeating pattern found");
+	
+	// 
+	int hi = 0, idx = 0;
+	int distance = 0, hi_1 = 0, idx_1 = 0;
+	for (int i=0; i<=len; ++i){
+		if ( CorrelBuffer[i] > hi) {
+			hi = CorrelBuffer[i];
+			idx = i;
+		}
 	}
 	
-	if (SaveGrph){
+	for (int i=idx+1; i<=window; ++i){
+		if ( CorrelBuffer[i] > hi_1 ) {
+			hi_1 = CorrelBuffer[i];
+			idx_1 = i;
+		}
+	}
+
+	int foo = ABS(hi-hi_1);
+	int bar = ((int)(((hi+hi_1) / 2) * 0.03));  
+	if ( verbose && foo < bar ) {
+		distance = idx_1 - idx;
+		PrintAndLogEx(SUCCESS, "possible 3% visible correlation %4d samples", distance);
+	} else if (verbose && ( correlation > 1 ) ) {
+		PrintAndLogEx(SUCCESS, "possible correlation %4d samples", correlation);
+	} else {
+		PrintAndLogEx(FAILED, "no repeating pattern found, try increasing window size");
+	}
+	
+	int retval = correlation;
+	if (SaveGrph) {
 		//GraphTraceLen = GraphTraceLen - window;
 		memcpy(out, CorrelBuffer, len * sizeof(int));
+		if ( distance > 0) {
+			setClockGrid(distance, idx);
+			retval = distance;
+		}
+		else
+			setClockGrid(correlation, idx);	
+		
+		CursorCPos = idx_1;
+		CursorDPos = idx_1+retval;
+		DemodBufferLen = 0;
 		RepaintGraphWindow();  
 	}
-	return correlation;
+	
+	return retval;
 }
 
 int CmdAutoCorr(const char *Cmd) {