UWP Quaternions Only Outputs

dcb6

Hello,

I have a UWP app configured with a start and stop button for streaming quaternions. However, if I start streaming the quaternions, hit "Stop", and then hit "Start" again, the quaternions don't stream again and nothing happens.

When the start button is pressed, the following code is run:

mbl_mw_settings_set_connection_parameters(cppBoard, 7.5F, 7.5F, 0, 6000);

mbl_mw_sensor_fusion_set_mode(cppBoard, SensorFusion.Mode.NDOF);

mbl_mw_sensor_fusion_set_acc_range(cppBoard, SensorFusion.AccRange.AR_16G); ///AR_2G, 4, 8, 16

mbl_mw_sensor_fusion_set_gyro_range(cppBoard, SensorFusion.GyroRange.GR_2000DPS); ///GR_2000DPS, 1000, 500, 250

mbl_mw_sensor_fusion_write_config(cppBoard);

IntPtr fusionsDataSignal = mbl_mw_sensor_fusion_get_data_signal(cppBoard, SensorFusion.Data.QUATERION); //this line works

mbl_mw_datasignal_subscribe(fusionsDataSignal, fusionDataHandler);

mbl_mw_sensor_fusion_enable_data(cppBoard, SensorFusion.Data.QUATERION);

mbl_mw_sensor_fusion_start(cppBoard);

When the stop button is pressed, the following code is run:

 IntPtr quatSignal = mbl_mw_sensor_fusion_get_data_signal(cppBoard, SensorFusion.Data.QUATERION);

 mbl_mw_sensor_fusion_stop(cppBoard);

 mbl_mw_sensor_fusion_clear_enabled_mask(cppBoard);

 mbl_mw_datasignal_unsubscribe(quatSignal);

Do you have any idea what might be going on?

Thanks,

Dan

Eric

If you use the same start/stop setup with just raw accelerometer or gyro data, does the same behavior occur?  What about using other sensor fusion outputs?

dcb6

Eric,

I can log raw accelerometer, magnetometer, and gyroscope data just fine, starting and stopping as a I please. The issue only occurs with quaternions, and it happens with all of the sensor fusion outputs (Compass, NDOF, IMU_PLUS, M4G).

Dan

dcb6

I should mention that I'm using a Metawear R sensor. I have reset the sensor using the Metawear iOS app and it has not helped.

dcb6

One more piece of information to add -- as soon as the quaternions stop working, streaming all other types of data stops working as well. 

Eric

So, streaming euler angles or linear acceleration is completely fine?  What if you reduced the accelerometer range to 8g, down from 16g?

dcb6

Hey Eric,

I was incorrect in what I said. Any Sensor Fusion mode/setting has the same problem, including streaming euler angles or linear acceleration. Reducing the accelerometer range does not help the problem.

Dan

Eric

Does quaternion streaming work fine when using the MetaBase app?

https://www.microsoft.com/en-us/store/p/metabase/9nblggh4txj3