[visionegg] Re: EEG triggers
- From: John Christie <jc@xxxxxxxxxxxxxxxxxxxx>
- To: visionegg@xxxxxxxxxxxxx
- Date: Thu, 27 Oct 2011 17:42:24 -0300
I'd say the latency is OK, but it's very consistent and can be easily
subtracted… about 3ms if I remember correctly.
On 2011-10-27, at 1:46 PM, Dav Clark wrote:
> That lib depends on another parallel port lib being installed. I'm unaware of
> a working one for mac. See the code snippet I've copied from DaqLPT.py
> below...
>
> You might consider ditching the parallel port and using a lab-jack:
>
> http://labjack.com/
>
> They have great python drivers and the hardware is very low-latency. You can
> get a simple parallel port adapter with screw terminals, or you can solder
> your own connector.
>
> Note also - LPT support on recent windows installs is painful and (in my
> experience) simply doesn't work. So, I'd say your best bet would be a linux
> box if you're committed to a true LPT port.
>
> Dav
>
> This is the import code for a parallel driver, note one URL points you to
> geocities! Is it spam or is it bad web design? You be the judge!
>
> if sys.platform == 'win32':
> try:
> # Dincer Aydin's module http://www.geocities.com/dinceraydin
> import winioport as raw_lpt_module
> except ImportError:
> # Andrew Straw's module http://www.its.caltech.edu/~astraw/coding.html
> import dlportio as raw_lpt_module
> elif sys.platform.startswith('linux'):
> import VisionEgg._raw_lpt_linux as raw_lpt_module
> elif sys.platform.startswith('irix'):
> ### IRIX implementation not done, but possible
> raise NotImplementedError("VisionEgg.DaqLPT not implemented on IRIX")
> ## import VisionEgg._raw_plp_irix
> ## raw_lpt_module = VisionEgg._raw_plp_irix
> else:
> raise RuntimeError("VisionEgg.DaqLPT not supported on this platform")
>
>
> On Oct 27, 2011, at 7:55 AM, tl a wrote:
>
>> Dear Andrew
>>
>>
>>
>> Im was wondering how I can use VisionEgg to send triggers to 'Neuroscan'
>> (EEG machine - though parallel port). Going by your suggestion in previous
>> posts (from 2003!) I tried importing raw_lpt_module from VisionEgg.DaqLPT
>> but i get a 'module doesn't exist' error. Has this been changed/updated in
>> Vision Egg 1.2.1? I have installed all the dependencies listed on the vision
>> egg website - I'm using python version 2.6.7 on a Mac OS X 10.7.2.
>>
>> looking forward to your response.
>> Thanks
>> Tara
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