Write Waveform (Direct DMA I16) (G Dataflow)

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Last Modified: July 24, 2019

Writes a specified amount of data from a Direct DMA-compatible waveform generator to the waveform in onboard memory.

If streaming is enabled, you can write more data than the allocated waveform size in onboard memory. By default, a call to this node continues writing data from the position of the last sample written.

Programming Patterns

You can change the write position and offset using Set Waveform Next Write Position. You must wire the waveform reference out output of Allocate Waveform or Create Waveform to the waveform reference in input of this node.

Inputs/Outputs
Compatibility

session in

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

channel name

Name of the waveform generator channel that the node uses.

waveform reference in

Reference to the arbitrary waveform previously allocated with Allocate Waveform or Create Waveform.

window address

Windows address of the Direct DMA-compatible data source.

samples to write

Number of samples to write from the Direct DMA-compatible data source.

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

session out

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

waveform reference out

Reference that identifies the waveform.

error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

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.

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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