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its1louder
Tux's lil' helper
Tux's lil' helper


Joined: 03 Jul 2003
Posts: 75
Location: Santa Barbara CA

PostPosted: Thu Dec 04, 2008 12:55 am    Post subject: comedi, RTAI, and other data acquisition. Reply with quote

Hi there,

Is there any one out there doing data acquisition on Gentoo systems? I have my own little hardware I use typically and I get kernel source code for the hardware drivers from the small vendors I use. Recently, trying to get a brand name National Instruments board working, I found I couldn't get the NI-DAQ drivers from the vendor to install. It wants fedora and slightly different kernel symlinks that I didn't care to troubleshoot too deeply. So I then searched around and tried to get comedi, and RTAI working. I haven't exhausted all those options yet and I am sure I'll get something working. But, I was surprised at how little interest there seems to be in the gentoo community for this stuff. The most recent talk about comedi or RTAI is circa 2006 and NI-DAQ not at all in these forums. Is no one doing that stuff or is it all just on the down low? Am i searching in the wrong places? I couldn't even find any references in the gentoo-science overlay message list.

Thanks!
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Wormo
Retired Dev
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Joined: 29 Nov 2004
Posts: 526
Location: SB County California

PostPosted: Sat Dec 06, 2008 5:04 am    Post subject: Reply with quote

It wouldn't hurt to subscribe to gentoo-science mailing list and send out a query to see if there are any experimental types lurking.

Personally, I have stayed away from Nat Inst boards in favor of brands that have better Linux support, e.g. a couple years ago I did a project with a General Standards board
http://www.generalstandards.com/view-products.php?product=PCI-HPDI32A
At least at the time, the high-speed Nat Inst boards did not have Linux drivers, and comedi didn't support them either.

P.S. are you doing a project at UCSB by any chance?
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its1louder
Tux's lil' helper
Tux's lil' helper


Joined: 03 Jul 2003
Posts: 75
Location: Santa Barbara CA

PostPosted: Mon Dec 08, 2008 10:17 pm    Post subject: Reply with quote

Quote:
It wouldn't hurt to subscribe to gentoo-science mailing list and send out a query to see if there are any experimental types lurking.


Yes! I should do that. I have since seen on the mailing list a little bit of talk in 2007. Since I posted this, I got Comedi to work, esp. with python bindings which is really neat and useful if you combine it with ipython/matplotlib. RTAI not so much. I guess if I run scripts as root it will have some aspects of real-timey-ness. Probably the way to have this in gentoo would be if some one or group took ownership of an RTAI-sources kernel source ebuild. I think it would just involve a kernel patch on vanilla but since I failed a perfunctory attempt I am an unreliable source. The most recent stable would be 2.6.23 although they claim that some 2.6.26 patches are in CVS.

Quote:
Personally, I have stayed away from Nat Inst boards in favor of brands that have better Linux support, e.g. a couple years ago I did a project with a General Standards board
http://www.generalstandards.com/view-products.php?product=PCI-HPDI32A
At least at the time, the high-speed Nat Inst boards did not have Linux drivers, and comedi didn't support them either.


Yes until now I have used hardware from vendors that give you the source to the kernel modules and the user land libs: Signatec, eagledaq. Luckily the NI board is well supported by comedi so it worked out great even though I couldn't get NI's official binary drivers to install.

Quote:

P.S. are you doing a project at UCSB by any chance?


No! I work for the military industrial complex in goleta, CA. At least for another month or so. You?
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Wormo
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Joined: 29 Nov 2004
Posts: 526
Location: SB County California

PostPosted: Thu Dec 18, 2008 6:30 am    Post subject: Reply with quote

its1louder wrote:

Quote:

P.S. are you doing a project at UCSB by any chance?


No! I work for the military industrial complex in goleta, CA. At least for another month or so. You?


I'm a UCSB alum -- now I am a partner in a small Linux consulting company, also in Goleta.

Too bad our local LUG is on break for the holidays, or I'd invite you to drop by and visit...
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