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Create Waveform (From File » I16) (G Dataflow)

Last Modified: September 26, 2018

Takes binary data from a specified file of 16-bit integers and creates an onboard waveform for use in arbitrary waveform or arbitrary sequence output modes.

The waveform generator must not be in the Generating state when you call this node.

Programming Patterns

You must set the output mode input of Configure Output Mode to arbitrary waveform or arbitrary sequence before calling this node.

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session in

Handle that identifies your instrument session previously allocated by Initialize With Channels.

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channel name

Name of the waveform generator channel that the node uses.

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file name

Full path and name of the file that contains the waveform data.

The data must be between -1.0 and +1.0. The 16-bit integer (I16) data value range of -32,768 to +32,767 is assumed to represent -1.0 to +1.0 volts. You can use the gain input of Configure Arbitrary Waveform or Configure Arbitrary Sequence to generate different voltages.

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byte order

Byte order of the data in the file.

Name Value Description
Little Endian 0 The byte order of the data in the specified file is Little Endian.
Big Endian (LabVIEW) 1 The byte order of the data in the specified file is Big Endian.

Big Endian Versus Little Endian Data Formats

Big Endian and Little Endian refer to the way data is stored in memory, which can differ on different processors.

Data written by most applications in Windows, including LabWindows™/CVI™, is in Little Endian format. Data written to a file from LabVIEW is in Big Endian format by default on all platforms.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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session out

Reference to your instrument session to wire to the next node.

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waveform reference out

Reference that identifies the waveform.

This output can be used later for setting the active waveform, changing the data in the waveform, building sequences of waveforms, or deleting the waveform when it is no longer needed.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Onboard Waveform Creation from Complex Data

This node can also create an onboard waveform from complex data for use on waveform generators with the OSP Enabled property set to True and the Data Processing Mode property set to Complex. To write complex data, you must interleave the I and Q value pairs.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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