Owning Palette: Advanced Function
Installed With: FPGA Interface
Converts an FPGA VI-specific reference to a more generic reference. You then can use common code to interact with different FPGA VIs. The FPGA targets must be of the same class. You might want to use this function if you want to evaluate different algorithms in a host VI without rewriting the host VI. Some FPGA targets might not support this function.
 Place on the block diagram | Find on the Functions palette |
 | FPGA VI Reference In is the reference to the FPGA VI running on the FPGA target. You must open a reference to the FPGA VI to use this parameter. | ||||||
 | error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code.
Use exception control to treat what is normally an error as no error or to treat a warning as an error.
Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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 | FPGA VI Reference Out returns a reference to the FPGA target. If you select Interface from the shortcut menu, FPGA VI Reference Out also returns information about the VI, including controls, indicators, data types, and the connector pane, but not including the VI filename. You can bind the FPGA VI Reference Out parameter to type definitions so that LabVIEW automatically propagates configuration changes to subsequent subVIs in the data flow. | ||||||
 | error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
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Up Cast Details
Right-click the Up Cast function and select Interface from the shortcut menu to output VI information and target information. Use the Interface option to pass data to the Read/Write Control function or Invoke Method function. If you select the Interface option, the FPGA VIs and targets must meet the following requirements: the front panel windows of the FPGA VIs are the same, the control and indicator tab order matches, and you use only one clock domain on the FPGA VI block diagram.
Right-click the Up Cast function and select Target from the shortcut menu to output only target information. Use the Target option to pass data to the Invoke Method function. The default is Target.
 | Note When you pass references to subVIs, consider binding the output of the Up Cast function to a type definition to propagate changes to the subVIs. Right-click the Up Cast function and select Bind Reference Output to Type Definition from the shortcut menu to bind the output. |