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multi channel analog output

HI,
     Iam using 6713 card for analog output generation, I want to generate waveforms across two channels with two indipendent tasks.
     and also I want to change the frequency of any of the channel waveforms without stopping the current generation.
     How can i fulfill my above requirements.
when I got the error when I assigned two channels of the same device to two indipendent tasks, I proceeded like this.
I have created a task in labwindows assigned two channels to it, configured the sample clock timing. first I used writeAnalogF64 function
to write data to the task with auto start, the 6713 was generating the waveforms in two channels as expected. While the task is running After a time delay I used
the same WriteAnalogF64 to write samples to the task with waveform types different to earlier, still it is generating the previous waveforms, I want the new waveforms to be generated.
Am I doing any mistake please give me a solution.
                                     Thank you.
 
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Hello Amruth,

From the problem description you've provided, I have a pretty good idea about what you are trying to do.  However, it is unclear how you are trying to change the waveforms that you are writing to the analog output channels.  Is it possible for you to post your code?

Best wishes,

Wallace F.

National Instruments
Applications Engineer
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