NI USB6008 + NiDaqMxBase + Linux simultaneous analog input

[Vadim_I]

Hello!

My setup:

NI USB6008

NiDaqMxBase

Linux OpenSUSE 11.0 on netbook Toshiba NB200

I need to measure 4 AI channels 5 times a second.

I do:

create AI0 ... AI3 = DAQmxBaseCreateAIVoltageChan( taskHandle, chan, "", DAQmx_Val_RSE, min, max, DAQmx_Val_Volts, NULL )

do

   start  AI0 - read AI0 - stop AI0 = DAQmxBaseStartTask(thAI0) - DAQmxBaseReadAnalogF64(thAI0... - DAQmxBaseStopTask(thAI0);

   ...

   start  AI3 - read AI3 - stop AI3

while true

One do-while loop takes ~ 1 second

The question: Is there a way to speed up the procedure?

Vadim.

[ManLongAtNI]

Hello Vadim,

To speed up your program I recommend setting your acquisition to do a continiuos read, as suppose to starting the task, reading one sample and ending the task, where most of your delay is likeely occurring.  Look in the following folder \\...National Instruments\NI-DAQmx Base\Examples\aicontAcquireNChan.c,for such an example.

Regards,

Glenn

Applications Engineer

National Instruments

[Vadim_I · Accepted solution]

Thank you! I got the idea.

Regards, Vadim.