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Andrew,
I have tested them and found some issues with bbGetIQUnpacked(). From my understanding when querying IQ data at a sample rate below 5MS/s (decimation greater than 8), a second FIR filter is applied to the data stream. It seems that the arm api implementation of this second FIR filter is corrupting data and reporting incorrect values on the RPi5 (a noise floor measurement [terminated analyzer] with decimation 16 using x86 will be around -130dBm while on ARM I see -80dBm [this is done with the same script, just different architecture]). GetIQUnpacked with decimations of 8 or less along with FetchTrace worked in my testing. I have seen this behavior in both PiOS lite as well as Ubuntu 24.04 on a Pi5
The aarch64 shared object file readme notes it is compiled on the Nvidia Jetson for Ubuntu 20.04. Would it be possible to get a version compiled on PiOS 64 or a Debian 13 OS with kernel 6.12?
It is great to have the API working on ARM; however, are there any updates this year/plan to have an ARM version of Spike? Having it run on something like a Pi 5 would be a game changer.
