Add a minimum clock threshold.

davidgiven · Jan 26, 2020 · 0c48897 · 0c48897
1 parent 60e5e35
commit 0c48897
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/lib/decoders/fluxmapreader.cc b/lib/decoders/fluxmapreader.cc
@@ -25,6 +25,11 @@ static DoubleFlag clockIntervalBias(
     "Adjust intervals between pulses by this many clocks before decoding.",
     -0.02);
 
+static DoubleFlag minimumClockUs(
+    { "--minimum-clock-us" },
+    "Refuse to detect clocks shorter than this, to avoid false positives.",
+    0.75);
+
 int FluxmapReader::readOpcode(unsigned& ticks)
 {
     ticks = 0;
@@ -222,7 +227,9 @@ nanoseconds_t FluxmapReader::seekToPattern(const FluxMatcher& pattern, const Flu
             seek(positions[intervalCount-match.intervals]);
             _pos.zeroes = match.zeroes;
             matching = match.matcher;
-            return match.clock * NS_PER_TICK;
+            nanoseconds_t detectedClock = match.clock * NS_PER_TICK;
+            if (detectedClock > (minimumClockUs*1000))
+                return match.clock * NS_PER_TICK;
         }
 
         for (unsigned i=0; i<intervalCount; i++)