simultaneous analog input output in matlab?

tele

Alright fellas,
its been a while since I've been here but I always got good answers, and I'm stuck again.

i'm doing a project using matlab and sonar sensors.
i can, seperately, output to the sensors and read an input from them; heres the problem. when I try to do this (write output and read input) in the same program ie. simultaneously I am getting DMA errors:

NI-DAQ: No DMA channel is available for use.

or

Bad value for analoginput property: 'TransferMode'.

've tried:

set(ai, 'TransferMode', 'SingleDMA');
set(ao, 'TransferMode', 'SingleDMA');

and

set([ai ao], 'TransferMode', 'DualDMA');

and

set(ai, 'TransferMode', 'DualDMA');
set(ao, 'TransferMode', 'DualDMA');

I need them to work simultaneously.
if anyone knows anythimg about this stuff I would really apreciate the help, i'm prob not explaining it very clearly but does any one even recognises this stuff???

Sound,
Tele

tele

I got a kind of an answer for this in case anyone is having the same problem. have to use interupts.
god matlab sucs

daveirl

This post has been deleted.

tele

Ya i know matlab doesnt suck, its pretty good to do just about everything