Re: student: simultaneous read write NI DAQ card help...

From: Bernd Porr <BerndPorr_at_f2s.com> · Date: Sat, 15 Sep 2007 23:57:25 +0100

You can just use cmd.c and ao_waveform. Just set n_chan to 4, for 
example and extend the channel list to 4 channels and it'll work with 4 
channels.

/Bernd

www:    http://www.berndporr.me.uk/
         http://www.linux-usb-daq.co.uk/
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         University of Glasgow
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JUSTIN ABRAHAM wrote:
> hi all,
> 
> i'm using the NI PCI-MIO-16E-1 DAQ card as part of my final year project at varsity.
> 
> i am trying to read and write simultaneously in to multiple analog channels at a sample rate of about 1MS/s(1.25MS/s is the card limit).
> 
> i'm running a SIDUX (debian) distro of linux and have downloaded and successfully installed comedi/comedilib etc. i managed to output a sinewave of 50MHz, onto one AO channel, using the 'ao_waveform.c' example that is provided with the comedilib package. i also read in a single AI channel at 1MS/s using the 'cmd.c' example. i'm not a pro at c/c++ but i've read the comedi documentation and figured a bit out about how these examples work and about the command struct and its various parameters etc.
> 
> basically i want to know how to read and write to multiple channels simultaneously.... any commented code or examples would be greatly appreciated.
> 
> thank you
> justin
> 
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