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RT programming: Interrupts

Use an onboard timer or an external event interrupt request (IRQ) to immediately execute a task.

LabVIEW RT icon and exclamation point icon


The Academic RIO Device default FPGA personality includes three types of interrupt sources: digital input transition, analog input threshold crossing, and timer. Each interrupt request (IRQ) suspends the current process to run a designated callback VI; the callback VI should be designed to run as quickly as possible so as not to unnecessarily delay other processes.

Up to eight independent timers are available. External inputs sources are available on the MXP-A/Bank A connector only (digital inputs 0, 1, 2, and 3; analog inputs 0 and 1).

Code examples

For more information

  1. Using Callback VIs to Handle Interrupts (myRIO Toolkit) (http://zone.ni.com/reference/en-XX/help/373925C-01/myriohelp/myrio_use_callback_vi)
    Guidelines for the design of VIs that will serve as callback VIs