Re: Inofficial BlackBox 2.0

From: [at]} <Maksimiuk>
Date: Tue, 27 Nov 2007 19:48:06 +0100

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Wojtek and all,
 I have some experience with a USB based acquisition system (www.ettus.com - the USRP HW) working under Linux (www.gnuradio.org) (in fact, this is the GNU radio project). I guess is that 32 MB/s from the USB 2.0 is the maximum you can get, and sometimes it depends
 on the underlying USB controller on the PC. I got 32 MB/s from the USRP system on my Lenovo ThinkPad 61 machine.
 You can also try this one: http://www.orpal.eu/ang/rejestrator.html

 
 Regards,
  Darek


> Message Received: 27/11/07 05:31 PM
> From: "Wojtek Skulski" <skulski{([at]})nowhere.xy
> To: BLACKBOX{([at]})nowhere.xy
> Cc:
> Subject: Re: Inofficial BlackBox 2.0
>
> On Tue, 27 Nov 2007, CFB Software wrote:
>
> > What sort of data transfer rates are you trying to achieve? I'm no expert in
> > all aspects of this type of programming but I have had plenty of experience
> > of the challenges of recording audio on Windows at ~170Kb per second without
> > interruption for up to three hours continuously
>
> We are aming at 50 MB/s continously for weeks at a time. The experiment is
> going to run for years.
>
> > This sort of data transfer
> > is usually done by device drivers communicating with Windows at the hardware
> > level and the Windows message loop being used by the application to transfer
> > the data from the device driver to itself. Is that the approach that you are
> > using or are you trying to control all of this at the BlackBox / application
> > level?
>
> I believe we will use this approach. We will customize a particular USB
> driver, whose role after customization will be to gather USB data buffers
> (1 kilobyte each) into long buffers, which will be presented to BlackBox
> for processing. The driver may also pre-process the data somewhat, but
> most of the processing will take place in BlackBox.
>
> Another challenge is that the data stream has to be continously written to
> disk. Yes, we know we will produce huge volumes of data. It is not clear
> whether the USB driver or BB will write the files. We do not know yet
> where are the bottlenecks in our DAQ system.
>
> So, the processing chain will look like this:
>
> 50 MB/s
> USB-2 link
> Custom hardware --------> PC --> USB driver --> BlackBox
> FPGAs and USB-2 | |
> | or |
> V V
> disk disk
>
>
> W.
>
>
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>

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Received on Tue Nov 27 2007 - 19:48:06 UTC