From 71b095cf2e0da31312a65401813fdcbd92817f9d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20K=C3=A4berich?= <j.kaeberich@gmx.de>
Date: Thu, 11 Nov 2021 22:09:45 +0100
Subject: [PATCH] Fix pointNum in SA result for DFT mode with narrow spans

---
 Software/VNA_embedded/Application/SpectrumAnalyzer.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp b/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp
index 0d1d973..e11da5e 100644
--- a/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp
+++ b/Software/VNA_embedded/Application/SpectrumAnalyzer.cpp
@@ -300,6 +300,10 @@ void SA::Work() {
 	if(!s.SignalID || signalIDstep >= signalIDsteps - 1) {
 		// this measurement point is done, handle result according to detector
 		for(uint16_t i=0;i<DFTpoints;i++) {
+			if(pointCnt + i >= points) {
+				// DFT covered more points than are required for the remaining sweep, can abort here
+				break;
+			}
 			uint16_t binIndex = (pointCnt + i) / binSize;
 			uint32_t pointInBin = (pointCnt + i) % binSize;
 			bool lastPointInBin = pointInBin >= binSize - 1;
@@ -386,7 +390,7 @@ void SA::Work() {
 			Communication::Send(packet);
 		}
 
-		if(pointCnt < points - DFTpoints) {
+		if(pointCnt + DFTpoints < points) {
 			pointCnt += DFTpoints;
 		} else {
 			pointCnt = 0;