NI-DAQmx C Reference Help

Edition Date: January 2019

Part Number: 370471AM-01

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int32 DAQmxCfgSampClkTiming (TaskHandle taskHandle, const char source[], float64 rate, int32 activeEdge, int32 sampleMode, uInt64 sampsPerChanToAcquire);


Sets the source of the Sample Clock, the rate of the Sample Clock, and the number of samples to acquire or generate.


Name Type Description
taskHandle TaskHandle The task used in this function.
source const char [] The source terminal of the Sample Clock. To use the internal clock of the device, use NULL or use OnboardClock.
rate float64 The sampling rate in samples per second per channel. If you use an external source for the Sample Clock, set this value to the maximum expected rate of that clock.
activeEdge int32 Specifies on which edge of the clock to acquire or generate samples.
Value Description
DAQmx_Val_Rising Acquire or generate samples on the rising edges of the Sample Clock.
DAQmx_Val_Falling Acquire or generate samples on the falling edges of the Sample Clock.
sampleMode int32 Specifies whether the task acquires or generates samples continuously or if it acquires or generates a finite number of samples.
Value Description
DAQmx_Val_FiniteSamps Acquire or generate a finite number of samples.
DAQmx_Val_ContSamps Acquire or generate samples until you stop the task.
DAQmx_Val_HWTimedSinglePoint Acquire or generate samples continuously using hardware timing without a buffer. Hardware timed single point sample mode is supported only for the sample clock and change detection timing types.
sampsPerChanToAcquire uInt64 The number of samples to acquire or generate for each channel in the task if sampleMode is DAQmx_Val_FiniteSamps. If sampleMode is DAQmx_Val_ContSamps, NI-DAQmx uses this value to determine the buffer size.

Return Value

Name Type Description
status int32 The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error.


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