Duplicate logger issue

mersis

Hello,

I am trying to build Windows Forms application on Windows 10. I use MetaWear CPRO device with 1.2.5 firmware.

I have done pairing, connecting, renaming, streaming data successfully. I am trying to test logging but I am encountering a strange problem that I haven't able found a solution. The problem is that when I register for acc signal log, the API calls logger ready callback once but when I use mbl_mw_logger_lookup_id function I see id 0 and id 1 are filled with same logger.

When I download log, I get half of the log what receivedProgressUpdate function tells. I don't get receivedUnknownEntry callback either.

Relevant code is below:

            loggerDelegate = new Fn_IntPtr(logger =>

            {

                if (logger != IntPtr.Zero)

                {

                    // below variables are equal to logger value above

                    var logger0 = mbl_mw_logger_lookup_id(board, 0);

                    var logger1 = mbl_mw_logger_lookup_id(board, 1);

                    mbl_mw_logger_subscribe(logger, dataPtr =>

                    {

                        Data data = Marshal.PtrToStructure<Data>(dataPtr);

                        var cf = Marshal.PtrToStructure<CartesianFloat>(data.value);

                        // ...

                    });

                }

                else

                {

                    Console.WriteLine("Failed to create the logger\n");

                }

            });

            var acc_signal = mbl_mw_acc_get_acceleration_data_signal(board);

            mbl_mw_datasignal_log(acc_signal, loggerDelegate);

            mbl_mw_logging_start(board, 0);

            mbl_mw_acc_enable_acceleration_sampling(board);

            mbl_mw_acc_start(board);

Eric

That is expected behavior for accelerometer data.  The only metric that matters is number of samples downloaded.  If your sample count is roughly equal to sampling rate * logging time, then you are good to go.  All of these other values mentioned are internal to the firmware and API.

mersis

Thanks Eric!

It is really annoying for the beginners. Because you cannot know whether or not you are doing something wrong.

Eric

If

# of samples = sampling rate * recording time

Is true, then you're doing it right.  If you're logging, you can also check the time difference between consecutive samples.