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No source available Error

Associate III

Hello everyone, I am currently doing a project that requires upto 16384 points of FFT(Fast Fourier Transform) . I found out that I can’t perform this number of FFT points using arm CMSIS DSP library since it is limited to 4096 point Max. Due to this I opted to use external library, Kiss_fft, because it is light weight. I tested this library with my computer by computing fft of some sampled signal and compare its result to that of python numpy fft library and the result are similar. So I proceed to use it on the micro-controller (STM32H723ZG). I performed the fft in the micro-controller using the kiss_fft library and transmit the result through USB com port to my computer and plot it in python. It works well up to 4098 point. If I try to perform 8192 point, its compiles successfully without any error but comm port is not being detected any more . So tried to debug the the code and I find this error  "No source available for sqrt() at 0x80120dc"   and it produces hardware fault. There seem to be enough memory for the FFT , I have attached the memories summary all well.

Best regard

Ukeme Patrick


Check the list file (or map?) to find out what's happening at 0x80120dc. These files are in the Release or Debug folder.

Also check:

- buffer sizes, maybe you forgot to increase some buffer sizes going from 4096 to 16384

- DMA transfer size is limited to 65535 items, maybe you hit that limit somewhere?

Associate III


I can't find this memory address in those files . I had increased my heap and stack size as shown  in  " "  image.

You've got linear blocks of 512KB to accomodated that?

Perhaps instead of shot-gunning this you look more deeply into what is actually failing.

Generate a listing, look at what code is at the failing address, perhaps library or related code you're binding without access to source. Work back the call-tree so you might understand how it got there from code you DO have source code for.

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