Merge with 3dfdbcf78de082edb66a8994ffb604c84945df0d

MyTracks/src/com/google/android/apps/mytracks/services/sensors/SensorUtils.java

@@ -33,6 +33,7 @@ public class SensorUtils {
 
   /**
    * Extract one unsigned short from a big endian byte array.
+   * 
    * @param buffer the buffer to extract the short from
    * @param index the first byte to be interpreted as part of the short
    * @return The unsigned short at the given index in the buffer
@@ -42,51 +43,56 @@ public class SensorUtils {
     r |= buffer[index + 1] & 0xFF;
     return r;
   }
-  
+
   /**
    * Extract one unsigned short from a little endian byte array.
+   * 
    * @param buffer the buffer to extract the short from
    * @param index the first byte to be interpreted as part of the short
    * @return The unsigned short at the given index in the buffer
    */
-	public static int unsignedShortToIntLittleEndian(byte[] buffer, int index) {
-		int r = buffer[index] & 0xFF;
-		r |= (buffer[index + 1] & 0xFF) << 8;
-		return r;
-	}
-	
-	/**
-	 * Returns CRC8 (polynomial 0x8C) from byte array buffer[start] until (including) buffer[end]
-	 * @param buffer the byte array of data (payload)
-	 * @param start the position in the byte array where the payload begins
-	 * @param end the position in the byte array where the payload ends
-	 * @return CRC8 value
-	 */
-	public static int getCrc8(byte[] buffer, int start, int end) {
-		int[] crc = { 0x0 };
-		
-		for (int i = start; i < (end+1); i++) {
-			crc8PushByte(crc, buffer[i]);
-		}
-		return crc[0];
-	}
-	
-	/**
-	 * Updates a CRC8 value by using the next byte passed to this method
-	 * @param crc int of crc value (as an array to pass it as reference)
-	 * @param add the next byte to add to the CRC8 calculation
-	 */
-	private static void crc8PushByte(int[] crc, byte add) {
-		int addInt = (add & 0x000000FF);
-		crc[0] = crc[0] ^ addInt;
-		for (int i = 0; i < 8; i++) {
-			if ((crc[0] & 0x00000001) != 0x00000000) {
-				crc[0] = (crc[0] >> 1) ^ 0x0000008C;
-			} else {
-				crc[0] = (crc[0] >> 1);
-			}
-		}
-	}
+  public static int unsignedShortToIntLittleEndian(byte[] buffer, int index) {
+    int r = buffer[index] & 0xFF;
+    r |= (buffer[index + 1] & 0xFF) << 8;
+    return r;
+  }
+
+  /**
+   * Returns CRC8 (polynomial 0x8C) from byte array buffer[start] until
+   * (including) buffer[end]
+   * 
+   * @param buffer the byte array of data (payload)
+   * @param start the position in the byte array where the payload begins
+   * @param end the position in the byte array where the payload ends
+   * @return CRC8 value
+   */
+  public static int getCrc8(byte[] buffer, int start, int end) {
+    int crc = 0x0;
+
+    for (int i = start; i < (end + 1); i++) {
+      crc = crc8PushByte(crc, buffer[i]);
+    }
+    return crc;
+  }
+
+  /**
+   * Updates a CRC8 value by using the next byte passed to this method
+   * 
+   * @param crc int of crc value
+   * @param add the next byte to add to the CRC8 calculation
+   */
+  private static int crc8PushByte(int crc, byte add) {
+    int addInt = (add & 0x000000FF);
+    crc = crc ^ addInt;
+    for (int i = 0; i < 8; i++) {
+      if ((crc & 0x00000001) != 0x00000000) {
+        crc = (crc >> 1) ^ 0x0000008C;
+      } else {
+        crc = (crc >> 1);
+      }
+    }
+    return crc;
+  }
 	
   public static String getStateAsString(Sensor.SensorState state, Context c) {
     switch (state) {

MyTracks/src/com/google/android/apps/mytracks/services/sensors/ZephyrMessageParser.java

@@ -21,34 +21,31 @@ import com.google.android.apps.mytracks.Constants;
 import com.google.android.apps.mytracks.content.Sensor;
 
 /**
- * An implementation of a SensorData parser for Zephyr HRM.
+ * An implementation of a Sensor MessageParser for Zephyr.
  *
  * @author Sandor Dornbush
  */
 public class ZephyrMessageParser implements MessageParser {
 
+  @Override
   public Sensor.SensorDataSet parseBuffer(byte[] buffer) {
     StringBuilder sb = new StringBuilder();
     for (int i = 0; i < buffer.length; i++) {
       sb.append(String.format("%02X", buffer[i]));
     }
     Log.w(Constants.TAG, "Got zephyr data: " + sb);
-    // The provided units are 1/16 strides per minute.
     // Heart Rate
     Sensor.SensorData.Builder heartrate = Sensor.SensorData.newBuilder()
-    .setValue(buffer[12] & 0xFF)
-    .setState(Sensor.SensorState.SENDING);
+        .setValue(buffer[12] & 0xFF)
+        .setState(Sensor.SensorState.SENDING);
     // Changes Nico Laum (Power and Cadence)
     Sensor.SensorData.Builder power = Sensor.SensorData.newBuilder()
 	    .setValue(buffer[11] & 0xFF)
 	    .setState(Sensor.SensorState.SENDING);
     Sensor.SensorData.Builder cadence = Sensor.SensorData.newBuilder()
-	    .setValue(SensorUtils.unsignedShortToIntLittleEndian(buffer, 56)/16)
+	    .setValue(SensorUtils.unsignedShortToIntLittleEndian(buffer, 56) / 16)
 	    .setState(Sensor.SensorState.SENDING);
     
-      // Cadence
-      //.setCadence(cadence / 16)
-      //.build();
     Sensor.SensorDataSet sds =
       Sensor.SensorDataSet.newBuilder()
       .setCreationTime(System.currentTimeMillis())
@@ -60,16 +57,20 @@ public class ZephyrMessageParser implements MessageParser {
     return sds;
   }
 
+  @Override
   public boolean isValid(byte[] buffer) {
-	  // Changes Nico Laum
-	  // Check STX, ETX and CRC Checksum
-    return (buffer[0] == 0x02 && buffer[59] == 0x03 && (SensorUtils.getCrc8(buffer, 3, 57) == (int) (buffer[58] & 0xFF)));
+    // Check STX, ETX and CRC Checksum
+    return buffer[0] == 0x02
+        && buffer[59] == 0x03
+        && SensorUtils.getCrc8(buffer, 3, 57) == (int) (buffer[58] & 0xFF);
   }
 
+  @Override
   public int getFrameSize() {
     return 60;
   }
 
+  @Override
   public int findNextAlignment(byte[] buffer) {
     // TODO test or understand this code.
     for (int i = 0; i < buffer.length - 1; i++) {