MetaWearC timing issue

Comments

• Eric

  July 2018

  Post your code
• SteveOD

  July 2018

  public void onServiceConnected(ComponentName name, IBinder service) {
  ///< Typecast the binder to the service's LocalBinder class
  serviceBinder = (BtleService.LocalBinder) service;

      BluetoothManager btManager= (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
      BluetoothDevice btDevice= btManager.getAdapter().getRemoteDevice(MW_MAC_ADDRESS);
  
      mwBoard= serviceBinder.getMetaWearBoard(btDevice);
      mwBoard.connectAsync().onSuccessTask(task -> {
          mwBoard.readBatteryLevelAsync()
                  .continueWith(info -> {
                      batteryLevelPercent = info.getResult();
                      if (batteryLevelPercent <= minBatteryLevel)
                          batteryStateText = "Battery Level Low, please change battery";
                      else
                          batteryStateText = "Battery Level: " + info.getResult() + "%";
  
                      Log.i(TAG, batteryStateText);
                      runOnUiThread(new Runnable() {
                          public void run() {
                              batteryLevel.setText(batteryStateText);
                          }
                      });
                      return null;
                  });
  
          accelerometer = mwBoard.getModule(Accelerometer.class);
          accelerometer.configure()
                  .odr(freq)
                  .range(4f)
                  .commit();
  
          runOnUiThread(new Runnable() {
              public void run() {
                  connectState.setText("Connected");
                  startAcc.setVisibility(View.VISIBLE);
                  stopAcc.setVisibility(View.VISIBLE);
              }
          });
          return accelerometer.packedAcceleration().addRouteAsync(source -> {
              source.stream((data, env) -> {
                  processAccelerationData(data, newFile);
              });
          });
          }).continueWith((Continuation<Route, Void>) task -> {
          if (task.isFaulted()) {
              Log.e(TAG, mwBoard.isConnected() ? "Error setting up route" : "Error connecting", task.getError());
              Log.i(TAG, "StartActivity: Faulted and Reset");
  
              runOnUiThread(new Runnable() {
                  public void run() {
                      connectState.setText("Failed to Connect, try a Reset");
                  }
              });
          } else {
  
              Log.i(TAG, "StartActivity: Connected");
              debug = mwBoard.getModule(Debug.class);
          }
  
          return null;
      });
  }
  
  private Void processAccelerationData(Data data, File file) {
      try {
          String newLine = "";
          Long time = data.timestamp().getTimeInMillis();
          if (firstTime == 0) {
              Log.i(TAG, "StartActivity: Processing");
              firstTime = time;
          }
          Long diff = time - firstTime;
          String s = diff.toString() ;
  
          Double x = (double)data.value(Acceleration.class).x();
          Double y = (double)data.value(Acceleration.class).y();
          Double z = (double)data.value(Acceleration.class).z();
          s = s +  "," + String.format("%.5f", x);
          s = s + "," +  String.format("%.5f",y);
          s = s + "," +  String.format("%.5f",z);
  
          count++;
          if (count > 0)
              newLine = s;
  
          writeDataToFile(file, newLine);
  
          Long countVal = count;
          runOnUiThread(new Runnable() {
              public void run() {
                  sampleCount.setText(countVal.toString());
              }
          });
      } catch (Exception e) {
          Log.e(TAG, "StartActivity: processAccelerationData() error - ", e);
      }
      return null;
  }
  
• Eric

  July 2018

  https://mbientlab.com/androiddocs/3/advanced_features.html#high-frequency-streaming
• SteveOD

  July 2018

  Noted.

  What is the default maximum Connection interval and why do the MetawearC and MetaMotionC boards perform differently?
• Eric

  July 2018 edited July 2018

  Default connection intervals are whatever the central device wants them to be; there is no set default value.

  MetaWearC and MetaMotionC boards have different hardware and run different firmware.