Moves the WS2801 driver to a new module and add tests

app/build.gradle

@@ -21,4 +21,5 @@ android {
 
 dependencies {
   provided 'com.google.android.things:androidthings:0.1-devpreview'
+  compile project(':ws2801-driver')
 }

app/src/main/java/com/xavirigau/ledcontroller/RainbowLedActivity.java

@@ -1,5 +1,7 @@
 package com.xavirigau.ledcontroller;
 
+import com.xrigau.driver.ws2801.Ws2801;
+
 import android.app.Activity;
 import android.graphics.Color;
 import android.os.Bundle;
@@ -14,7 +16,7 @@ public class RainbowLedActivity extends Activity {
 
     private static final String TAG = RainbowLedActivity.class.getSimpleName();
     private static final int FRAME_DELAY_MS = 15;
-    private static final int NUM_LEDS = 5;
+    private static final int NUM_LEDS = 1;
 
     private final int[] mLedColors = new int[NUM_LEDS];
 
@@ -35,7 +37,7 @@ public void onCreate(Bundle savedInstanceState) {
 
         try {
             Log.d(TAG, "Initializing LED strip");
-            mLedstrip = new Ws2801(BoardDefaults.getSPIPort(), Ws2801.Mode.RBG);
+            mLedstrip = Ws2801.create(BoardDefaults.getSPIPort(), Ws2801.Mode.RBG);
             mHandler.post(mAnimateRunnable);
 //            mLedstrip.write(new int[]{Color.BLACK}); // Uncomment this line and comment the previous one to turn off
         } catch (IOException e) {

app/src/main/java/com/xavirigau/ledcontroller/SimpleLedActivity.java

@@ -1,5 +1,7 @@
 package com.xavirigau.ledcontroller;
 
+import com.xrigau.driver.ws2801.Ws2801;
+
 import android.app.Activity;
 import android.graphics.Color;
 import android.os.Bundle;
@@ -18,7 +20,7 @@ public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         try {
-            mLedstrip = new Ws2801(BoardDefaults.getSPIPort(), Ws2801.Mode.RGB);
+            mLedstrip = Ws2801.create(BoardDefaults.getSPIPort(), Ws2801.Mode.RGB);
             mLedstrip.write(new int[]{Color.parseColor("#0face0")});
             Log.d(TAG, "Done!");
         } catch (IOException e) {

settings.gradle

@@ -1 +1 @@
-include ':app'
+include ':app', ':ws2801-driver'

ws2801-driver/build.gradle

@@ -0,0 +1,29 @@
+apply plugin: 'com.android.library'
+
+android {
+  compileSdkVersion 25
+  buildToolsVersion "25.0.2"
+
+  defaultConfig {
+    minSdkVersion 24
+    targetSdkVersion 25
+    versionCode 1
+    versionName "1.0"
+
+    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+  }
+  buildTypes {
+    release {
+      minifyEnabled false
+      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+    }
+  }
+}
+
+dependencies {
+  provided 'com.google.android.things:androidthings:0.1-devpreview'
+
+  testCompile 'junit:junit:4.12'
+  testCompile "org.mockito:mockito-core:1.10.19"
+}

ws2801-driver/proguard-rules.pro

@@ -0,0 +1,25 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /usr/local/Cellar/android-sdk/24.4.1_1/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

ws2801-driver/src/main/AndroidManifest.xml

@@ -0,0 +1,11 @@
+<manifest package="com.xrigau.driver.ws2801"
+
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application>
+
+        <uses-library android:name="com.google.android.things" />
+
+    </application>
+
+</manifest>

ws2801-driver/src/main/java/com/xrigau/driver/ws2801/ColorUnpacker.java

@@ -0,0 +1,46 @@
+package com.xrigau.driver.ws2801;
+
+import com.xrigau.driver.ws2801.Ws2801.Mode;
+
+import android.graphics.Color;
+
+class ColorUnpacker {
+
+    // RGB LED strip configuration that must be provided by the caller.
+    private final Mode ledMode;
+
+    ColorUnpacker(Mode ledMode) {
+        this.ledMode = ledMode;
+    }
+
+    /**
+     * Returns an WS2801 packet corresponding to the current brightness and given {@link Color}.
+     *
+     * @param color The {@link Color} to retrieve the protocol packet for.
+     * @return WS2801 packet corresponding to the current brightness and given {@link Color}.
+     */
+    byte[] unpack(int color) {
+        int r = Color.red(color);
+        int g = Color.green(color);
+        int b = Color.blue(color);
+        return getOrderedRgbBytes(ledMode, (byte) r, (byte) g, (byte) b);
+    }
+
+    static byte[] getOrderedRgbBytes(Mode ledMode, byte r, byte g, byte b) {
+        switch (ledMode) {
+            case RBG:
+                return new byte[]{r, b, g};
+            case BGR:
+                return new byte[]{b, g, r};
+            case BRG:
+                return new byte[]{b, r, g};
+            case GRB:
+                return new byte[]{g, r, b};
+            case GBR:
+                return new byte[]{g, b, r};
+            default:
+                throw new IllegalArgumentException(ledMode.name() + " is an unknown " + Mode.class.getSimpleName());
+        }
+    }
+
+}