I often work with the FPGA in hybrid mode because the Scan Interface covers most of the project requirements 90% of the time. When NI added support for the SGL datatype to the FPGA module in 2012 (?), they overlooked user-defined variables. There is currently no built-in support for typecasting a SGL to U32, so passing SGL data back to the host requires FP controls or using custom typecasting solutions (see SGL typecast) on both the FPGA and host layers.
Please add SGL as an option for user-defined variables.
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