From 94db11e93728e3a1bdef6cd550eabd53a4338044 Mon Sep 17 00:00:00 2001
From: Matthias Wirth <matthias.wirth@gmail.com>
Date: Tue, 5 Nov 2024 08:13:13 +0100
Subject: [PATCH] fixup autogain min gain setting

---
 readsb.c     | 2 +-
 sdr_rtlsdr.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/readsb.c b/readsb.c
index 46e63a7b..b4b7024a 100644
--- a/readsb.c
+++ b/readsb.c
@@ -1565,7 +1565,7 @@ static void parseGainOpt(char *arg) {
         } else {
             Modes.loudThreshold = 243;
         }
-        fprintf(stderr, "startingGain: %4.1f noiseLowThreshold: %3d noiseHighThreshold: %3d loudThreshold: %3d\n",
+        fprintf(stderr, "lowestGain: %4.1f noiseLowThreshold: %3d noiseHighThreshold: %3d loudThreshold: %3d\n",
                 Modes.gain / 10.0, Modes.noiseLowThreshold, Modes.noiseHighThreshold, Modes.loudThreshold);
     } else {
         Modes.gain = (int) (atof(arg)*10); // Gain is in tens of DBs
diff --git a/sdr_rtlsdr.c b/sdr_rtlsdr.c
index 5872e587..fb3bb470 100644
--- a/sdr_rtlsdr.c
+++ b/sdr_rtlsdr.c
@@ -121,6 +121,10 @@ void rtlsdrSetGain(char *reason) {
         Modes.increaseGain = 0;
         Modes.lowerGain = 0;
 
+        if (RTLSDR.gains[closest] < Modes.minGain) {
+            // new gain less than minimum, nothing to do
+            return;
+        }
         if (Modes.gain == RTLSDR.gains[closest]) {
             // same gain, nothing to do
             return;