two interrupt vi's running in parallel

[graduate student 44]

on my fpga vi, i have two while loops running in parallel. one while loop generates an interrupt with IRQ=0 to the host every 10sec. the other while loop generates an interrupt with IRQ=1 to the host every 5sec. on the host side, two seperate subvi's running in parallel are waiting for interrupts from one of the two IRQ lines. somehow it seems like that everything works fine if i disable one of the two IRQ interrupts, but when both are enabled, neither one can be picked up by the host consistently.

what will be a general optimal strategy to deal with this issue? i would like to avoid polling if possible.

[Christian_L]

You can only use one Wait for IRQ function in your host VI. In this one loop you should retrieve the number of the IRQ that was generated and process it accordingly.

Christian L

[Vineet_A.]

Hello,

There is only one interrupt line on the FPGA device, so the host should really wait on IRQ and acknowledge in only one place. Just as Christian mentioned, handle the interrupts in the same VI on the host and that should fix the problem.

Regards,
Vineet A.
Applications Engineer
National Instruments

[graduate student 44]

thanks Christian and Vineet! that makes sense. everything is fine now.