added experimental PD290 support

full 616 lines are supported but width is 640 pixels instead of 800 to
avoid breaking other modes. that means the aspect ratio is wrong for
PD290 at the moment.

app/src/main/java/xdsopl/robot36/Decoder.java

@@ -115,6 +115,7 @@ public class Decoder {
 		syncPulse20msModes.add(new PaulDon("160", 98, 512, 400, 0.195584, sampleRate));
 		syncPulse20msModes.add(new PaulDon("180", 96, 640, 496, 0.18304, sampleRate));
 		syncPulse20msModes.add(new PaulDon("240", 97, 640, 496, 0.24448, sampleRate));
+		syncPulse20msModes.add(new PaulDon("290", 94, 640, 616, 0.2288, sampleRate));
 	}
 
 	private double scanLineMean(int[] lines) {

app/src/main/java/xdsopl/robot36/MainActivity.java

@@ -457,7 +457,7 @@ public class MainActivity extends AppCompatActivity {
 		scopeBuffer = new PixelBuffer(640, 2 * 1280);
 		freqPlotBuffer = new PixelBuffer(256, 2 * 256);
 		peakMeterBuffer = new PixelBuffer(1, 16);
-		imageBuffer = new PixelBuffer(640, 496);
+		imageBuffer = new PixelBuffer(640, 616);
 		createScope(config);
 		createFreqPlot(config);
 		createPeakMeter();
@@ -545,6 +545,10 @@ public class MainActivity extends AppCompatActivity {
 			setMode(R.string.pd240);
 			return true;
 		}
+		if (id == R.id.action_force_pd290) {
+			setMode(R.string.pd290);
+			return true;
+		}
 		if (id == R.id.action_force_martin1) {
 			setMode(R.string.martin1);
 			return true;

app/src/main/res/menu/menu_main.xml

@@ -62,6 +62,9 @@
 							<item
 								android:id="@+id/action_force_pd240"
 								android:title="@string/pd240" />
+							<item
+								android:id="@+id/action_force_pd290"
+								android:title="@string/pd290" />
 						</menu>
 					</item>
 					<item android:title="@string/martin_modes">

app/src/main/res/values/strings.xml

@@ -14,6 +14,7 @@
 	<string name="pd160" translatable="false">PD 160</string>
 	<string name="pd180" translatable="false">PD 180</string>
 	<string name="pd240" translatable="false">PD 240</string>
+	<string name="pd290" translatable="false">PD 290</string>
 	<string name="martin1" translatable="false">Martin 1</string>
 	<string name="martin2" translatable="false">Martin 2</string>
 	<string name="scottie1" translatable="false">Scottie 1</string>