This is the documentation for the latest (main) development branch of HPM SDK. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

7. DSP

7.1. Overview

The dsp_demo sample project shows the DSP CFFT and CIFFT calculations and prints the results through the serial port.

7.2. Board Setting

No special settings

7.3. Running the example

When the project runs correctly, and the serial port terminal will output the following information:

after CFFT_RD2, maxdiff= 0x0080 [0.00390816]
MAE is 0.00079375, RMSD is 0.00176055, NRMSD is 0.00005502, MAXDIFF is 0.00390816, SNR is 67.12823486
CFFT_RD2 out scaleup by 64
after CIFFT_RD2, maxdiff= 0x0009 [0.00029564]
MAE is 0.00012192, RMSD is 0.00014900, NRMSD is 0.00007450, MAXDIFF is 0.00029564, SNR is 73.52618408
CIFFT_RD2 out scaleup by 2