You can find more information about DSP2812 of TI company here. It is useful for your programming!

Fast Fourier Transform (FFT). Using 8 points, takes about 1.2 ms to execute one FFT. Sets up General Purpose Timer 1 to generate events at 10 kHz. Will produce 10 kHz output on T1PWM and T1PWM pins.-Fast Fourier Transform (FFT). Using 8 poin

这是个F2812 fft 源程序，是TI的例程。-This is a F2812 fft source program from TI.