Hello, I tested the firmware that implements the FFT by Paulvvz and I was really impressed. In order to allow inclusion, in future versions, of the FFT calculus using open code, I used the libraries of DSP from ST and the work done by Benf and Paulvvz to also implement an FFT aplication. So, I am posting the code and firmware here. This FFT can operate with 64, 256 or 1024 points. The graph of the frequency is superimposed on the temporal graph, but using a different color. IAR 5.4 was used in the compilation.
FFT_DSP_ST.rar (391 KB)
Dso201_APP_FFT.rar (60.9 KB)