Table Of Contents

Read Write I/O (G Dataflow)

Version:
    Last Modified: February 27, 2020

    Performs specific FPGA I/O operations on FPGA targets.

    To begin using this node with I/O, click the Select I/O parameter and select an I/O from the list. Configure the channel properties of the selected I/O on the Item tab.

    To create an I/O reference control, place an I/O Constant on the diagram, select an I/O in the constant, right-click the constant, and select Change to control. You can also create an I/O reference control by clicking on an I/O in this node, selecting Wire on diagram, right-clicking the I/O reference control terminal, and selecting Create control.

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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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    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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    Select I/O

    Data read from or written to the FPGA I/O you specify.

    Click this parameter and select an I/O from the list. For I/Os that support read operation, this parameter is an indicator by default. For I/Os that do not support read operation, this parameter is a control by default. To change an I/O to a control or indicator, right-click the I/O in the node and select Change to write or Change to read.

    To add more I/Os, drag the edge of the node up or down or right-click an I/O and select Insert element before. To remove an I/O, right-click the I/O and select Remove element.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: C Series devices only

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


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