FPGA Compiler Bug

[LucianM]

While developing a driver for the NI-9853 CAN module I noticed that an indicator was written with an unexpected value. The TRUE case was executed but output "CAN Err Byte" was set to 0:

Code was executed on a cRIO-9035 using LabVIEW 2020SP1. Code is attached in zip file:

[Messenger2]

Hello LucianM,

Have you tried adding a small delay before "updating" the indicator? I recall indicators being unreliable sometimes. 

I'll try to replicate this soon.

[LucianM]

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@Messenger2 wrote:

 I recall indicators being unreliable sometimes. 

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I never heard about this and never had this issue but I tried with 1000us and 100ms delay and saw no changes. Indicator is still written with 0 instead of 1.

Thank you for looking into this!

[UliB]

I don't have FPGA, so I can't test, but it seems like a bug to me too.

Just an idea for a workaround: What happens if you insert a "Always Copy Function" after the constant?

[LucianM]

There is no "Always Copy" in FPGA module:)