This project acquires the PDM (Pulse Density Modulation) microphone signal using DFSDM (Digital filter for Sigma-Delta modulators interface) function of STM32 MCU and outputs its frequency characteristics by using FFT.
Software CIC filter with SPI is here.
System Workbench for STM32 (SW4STM32) + STM32CubeL4
SPH0641LU4H-1 (Knowles)
Here is breakout board
