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Set Named Waveform Next Write Position (G Dataflow)

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Last Modified: July 24, 2019

Sets the position in the named waveform to which data is written at the next write. Allows you to write to arbitrary locations within the waveform.

This node only applies settings to the next write to the specified waveform. Subsequent writes to the waveform begin where the last write left off, unless this node is called again.

Programming Patterns

The waveform name input must have been created by a call to Allocate Named Waveform and wired to this node.

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offset

Offset from the position specified by the relative to input at which to start loading the data into the waveform.

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session in

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

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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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channel name

Name of the waveform generator channel that the node uses.

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waveform name

Name of the waveform.

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relative to

Reference position in the waveform. This position and the offset together determine where to start loading data into the waveform.

Name Value Description
NIFGEN_VAL_WAVEFORM_POSITION_CURRENT 0 The reference position is relative to the current position.
NIFGEN_VAL_WAVEFORM_POSITION_START 1 The reference position is relative to the start of the waveform.
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session out

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

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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.
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waveform name out

Name of the named waveform.

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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