可实现信号快速傅里叶变换，keil C源代码，频谱分析-Signal fast Fourier transform keil C source code, spectrum analysis

vivado hls编写的八点fft工程，代码简洁清晰有注释，C语言编写-Vivado HLS written FFT engineering at eight o clock, the code is concise and clear with comments, C language