[FieldTrip] Brainvision recorder RDA

[Boris Reuderink]

Dear Bora Cebeci,

Thank your for reporting this issue. There are indeed other reports
that reading the RDA protocol is not working properly:
http://bugzilla.fcdonders.nl/show_bug.cgi?id=1172
http://bugzilla.fcdonders.nl/show_bug.cgi?id=1164

The packet that causes rda2ft.exe to crash is not documented in the
RDA protocol, and we are in contact with BrainProducts in order to
resolve this issue.

The problem you mention in (3) is unforgivable, and I would like to
ask you to report this as a separate bug on
http:/bugzilla.fcdonders.nl (just copy and past the email). You can
then also subscribe to the other two bugs, which allows you to track
our progress on fixing this issue.

Best regards,

Boris Reuderink


On Mon, Dec 12, 2011 at 9:18 AM, Bora Cebeci <boracbci at gmail.com> wrote:
> Hi,
>
> I want to use the Fieldtrip functions for real-time data processing. I'm
> testing the delay. Neither rda2ft.exe nor ft_realtime_brainampproxy.m is
> working properly. If you don't get an event, ft_realtime_brainampproxy.m can
> be usable.
> I found three messages about Brain Vision Recorder in the mail list. I have
> similar problems as mentioned in those messages.
>
> 1) I think that using rda2ft.exe is faster than ft_realtime_brainampproxy.m,
> so finding a solution for rda2ft.exe problem will be enough. I have the same
> error message as Casper van Heck.
> Casper  said:
> "
>
>> When running rda2ft.exe (with the parameters localhost and 51244) it does
>> seem to connect; it shows the list of channels (all channels), their
>> resolution, and their names, and some other assorted stuff. However, it then
>> says:
>
>
>> "Unrecognized packet type (10000), has size 24 - exiting"
>
> "
> My parameters : " rda2ft.exe localhost 51234"
> and I tried it in a different PC: " rda2ft.exe 10.1.54.160 51234"
> I got the same error message.
>
>
> 2) Secondly, I tried to use ft_realtime_brainampproxy.m, but I cannot use it
> efficiently. When an event occurs, buffering freezes and there is no error
> message.
>
> I have a bad solution for this problem. I'm stopping the program by "Ctrl+C"
> then I start it again.
> Meanwhile I measured 179ms delay (average of 45 trials), it is really big ??
>
>
> 3) Even the above problem is solved, the events cannot read. Khalid
> mentioned before about this problem. I couldn't find the reading code for
> events in the ft_realtime_brainampproxy.m file. Here is the related part of
> the code:
>
>  % convert the RDA message into data and/or events
>   dat   = [];
>   event = [];
>
>   if msg.nType==2 && msg.nPoints>0
>     % FIXME should I apply the calibration here?
>     dat = msg.nData(chanindx,:);
>   end
>
>   if msg.nType==4 && msg.nPoints>0
>     % FIXME should I apply the calibration here?
>     dat = msg.fData(chanindx,:);
>   end
>
>   if (msg.nType==2 || msg.nType==4) && msg.nMarkers>0
>     % FIXME convert the message to events
>   end
>
> The variable 'event' doesn't get any value here. So by using ft_read_event
> function , you get an empty vector.
>
> Thanks
>
>
> --
> Bora Cebeci
>
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