build hexadecimal string into byte array

[kierzie123]

My end task is to send commands over UDP to an FPGA. The commands are available in Python script.

I haven't worked with byte arrays for years and am looking for some help.

Attached is LoopThroughItemNumber.vi  I want to replace the hex value in column 5 to change a setting.

I manually created the array that works but am struggling with code to do the same thing. Thank you in advance for looking at this.

[GerdW]

Hi kierzie,

unfortunately I cannot open your VI due to its LabVIEW version, but maybe this can help you:

[kierzie123]

Hi GerdW,

Your answer helped. Attached is a new file saved for LabVIEW 2021. I apologize for not thinking to do that with the first post.

In the 2021 version I added code to change the item number.

Thank you for your help!

kierzie

using LabVIEW 2023 on Win10/11

[altenbach · Accepted solution]

If I understand the problem correctly, here's what I would do:

[raphschru · Accepted solution]

@altenbach the scan format should be 0x%x instead of 0x%d.

[paul_cardinale]

Or this:

[kierzie123]

Thank you very much! We will be using array index 5 because of the way the embedded engineers wrote their code.  What I need to change is in the second byte of the U16.

raphschru's advice to use 0x%x will probably work as well.

The replies helped me get past a huge roadblock.

[kierzie123]

This solution works also, once I changed the array index from 4 to 5!

[altenbach]

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@raphschru wrote:

@altenbach the scan format should be 0x%x instead of 0x%d.

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Sorry yes, small typo. (Of course it does not make a difference if all numbers are very small has seen here). 😄

(I edited my post to avoid confusion in the future)

[altenbach]

Just for fun, this minimal code works too... Less pink! 😄