fixup autogain min gain setting

wiedehopf · Nov 5, 2024 · 7c34ff3 · 7c34ff3
1 parent c67e671
commit 7c34ff3
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/readsb.c b/readsb.c
@@ -1550,6 +1550,9 @@ static void parseGainOpt(char *arg) {
         } else {
             Modes.minGain = 0;
         }
+        if (Modes.gain < Modes.minGain) {
+            Modes.gain = Modes.minGain;
+        }
         if (token[2]) {
             Modes.noiseLowThreshold = atoi(token[2]);
         } else {
@@ -1565,7 +1568,7 @@ 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
@@ -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;