[NUC121] Demonstrate the Use of FFT

• Application: Demonstrate the method and the result of using Fast Fourier Transform to convert the ADC samples into frequency domain spectrum.
• BSP Version: NUC121/125 Series BSP CMSIS V3.01.003
• Hardware: NuTiny-SDK-NUC121_V1.0
  

Fast Fourier Transform (FFT), a commonly used method for signal analysis, can be used to convert discrete-time signals into the frequency domain spectrum. User can benefit from FFT by observing the spectrum and find out the frequency composition of the original signal. This example will demonstrate how to use ADC and TIMER to sample a piece of discrete signal, which will be used for Fast Fourier Transform, and finally observe whether the spectral value distribution matches the characteristics of the original input signal. Three types of signal length are supported, which are 128 samples, 256 samples, and 512 samples.

You can download the sample code at https://www.nuvoton.com/resource-downlo ... 1216164918