Problem in ANSI C for example - error TDMS-ContAcq-IntClk 200877

Hello

I tried the examples in the 'ANSI C examples' folder and ran into a snag with the example in:

"" \DAQmx ANSI C\Analog In\Measure Voltage\Acq TDMS-Cont-Int Clk".

When I run it as it is, I get the following error:

DAQmx error: requested each interval of N samples event is not supported for the given the mechanism of transfer of data and the buffer size. To keep the DMA or USB in bulk as the data transfer mechanism, change the size of the buffer or the interval of event Every N samples so the size of the buffer is a multipleof even interval event Every N samples. To keep the same each event interval of N samples and the size of the buffer, modify the mechanism for transfer of data interruptions if taken in charge. Property: DAQmx_Every N samples CQI event IntervalRequested value buffer: size 1000Buffer: 12288Task name: _unnamedTask<0>State :-200877End of the program Code, press the Enter key to exit

As I was typing this, I did a quick test. I tried to comment this line in the code:

/ / *	/ / PDM DAQmx Configure Code	/ * /	DAQmxErrChk (DAQmxConfigureLogging(taskHandle,"C:\\example.tdms",DAQmx_Val_LogAndRead,"GroupName",DAQmx_Val_OpenOrCreate));)

and it worked, as I suspected.

My gut feeling is that the DAQmxConfigureLogging function expects a block of 12 288 bytes, and in the rest of the code, the number of samples is set to 1000, with a sampling frequency of 10000.

In any case, I fixed it by changing from 1000 to 1024 (1024 because * 12 = 12288) anywhere in the code, so solve the original problem.

I don't have a few new questions now:

1. is this an error in the example, or am I missing something?

2. How do you change the default size 12288 DAQmxConfigureLogging() waiting for let say 5000?

Thank you.

Hall

Hey Bob,

In fact, it is a bug with this example.  It comes with the value 1000 for the wrong sampling interval since it is an example of logging.  When logging is enabled on a task, default buffer sizes are slightly different from the default values without connecting.  This is because the default buffer sizes are powers of 10, while hard drives prefer to powers of 2.  It is a maneuver of performance as we listen to disc directly from the buffer DAQmx.

I think you should be able to use 1024 as your sampling instead of 1000 interval in this example.  In this example, the default value will change so that it is not immediately error (Corrective Action Request #177199).

Tags: NI Software

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