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Re: Re: interfacing odd usb device to mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg100551] Re: [mg100547] Re: interfacing odd usb device to mathematica
• From: Adam Simpson <simpsoa at email.uc.edu>
• Date: Mon, 8 Jun 2009 02:03:55 -0400 (EDT)
• References: <h0d6r8$sp9$1@smc.vnet.net> <200906070903.FAA28170@smc.vnet.net>

I have written some C code that uses a USB library to read in a data  
stream from an OCZ EEG if you are interested. It's set up to run in OS  
X but would work in linux without too many changes I believe. The main  
issue is knowing how the data is sent from the device and how to  
translate it into useable numbers.

I was also not able to get mathematica to read it in a very good way,  
other than making a loop that reads in data for a predetermined amount  
of time while a plot is dynamically updated. Exam week starts monday  
and so I don't think I would have time to get it all collected  
together for a week or so though but if you're still interested I can  
post it on my website with instructions on how to get it all set up  
and use it.

Adam Simpson


On Jun 7, 2009, at 5:03 AM, ragfield wrote:

> On Jun 6, 2:45 am, "zac.ernst" <zac.er... at gmail.com> wrote:
>> I am fed up with the cheesy software that comes with my biofeedback
>> USB device, and I'd like to interface it to Mathematica.  It is a
>> LightStone device from the "Wild Divine" project.  The trouble is  
>> that
>> it does not show up on ControllerInformation[], although it does show
>> up on my Mac's USBProbe software.  I am using Mac OSX, version 4.11
>> and Mathematica 7.  USBProbe gives me the following information about
>> the device:
>>
>>        Descriptor Version Number:   0x0110
>>        Device Class:   0   (Composite)
>>        Device Subclass:   0
>>        Device Protocol:   0
>>        Device MaxPacketSize:   8
>>        Device VendorID/ProductID:   0x14FA/0x0001   (unknown=
> vendor)
>>        Device Version Number:   0x2441
>>        Number of Configurations:   1
>>        Manufacturer String:   3 "Wild Divine       "
>>        Product String:   1 "ST7 RS232 USB BIOFBK"
>>        Serial Number String:   0 (none)
>>
>> The only solution I can think of now is to try to write a separate
>> program to stream output from the device and then read that output
>> into Mathematica.  But if there's some way to get Mathematica to
>> recognize the device itself, that would obviously be much better.
>
> The only USB devices supported by Mathematica via the ControllerState
> [] function on Mac OS X are those which conform to the USB HID (human
> interface device) specification.  Other (custom) USB devices cannot be
> supported in the same general way.  I think your only option to get
> data from this device into Mathematica would be to write a custom
> MathLink application.
>
> -Rob
>

• References:
  • Re: interfacing odd usb device to mathematica
    • From: ragfield <ragfield@gmail.com>