Spectral Analysis by STM32 Microcontroller of the Mixed Signal

This article describes the realization of Fast Fourier transform Radix-2 for STM32F746ZG microcontroller and measurement of its precision. A measured frequency spectrum is compared with the professional spectrum analyzer by BitScope system. Whereas the square signal contains a lot of harmonics, measured precision is provided by this signal type. The article describe also speed comparing between Fast Fourier transform and Discrete Fourier transform. The result table shows ten measurements of various sample numbers with their transformation time. The end of article contains time comparing of our FFT with Radix-2 and ARM library FFT with used Radix-8.