DAQmx_Val_DMA; contradictory property

Hello?

Recently, I got an error about the DAQmxSetReadWaitMode() function. I used DAQmx_Val_WaitForInterrupt property but got an error saying that it is in conflict with the DAQmx_Val_DMA property. Given that I do not use DMA mode and any function for DMA operation, I wonder DAQmx automatically uses this property DMA and DMA mode. If it is true, how can I use polling mode or break mode manually? I used DAQmxSetAIDataXferMech() to set the mode of interruption, but it keeps returning, that he is in conflict with the DAQmx_Val_DMA property. This error always occurs when a continuous sampling mode? Thank you

No, 6025E has 3 DMA channels as its manual says. Anyway, I solved this problem by adding this code

Looks like DAQmx automatically uses the DMA mode, unless the user manually adds the codes for mode of interrogation or request mode.

DAQmxErrChk (DAQmxSetSampTimingType(CounterHandle, DAQmx_Val_OnDemand));DAQmxErrChk (DAQmxSetSampClkSrc(CounterHandle, "/Dev1/PFI3"));DAQmxErrChk (DAQmxSetSampClkActiveEdge(CounterHandle, DAQmx_Val_Falling));

Tags: NI Software

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