NUCLEO-L476RG_DFSDM_PDM-Mic

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.

Example

MCU board

NUCLEO-L476RG

IDE

System Workbench for STM32 (SW4STM32) + STM32CubeL4

Microphone used for the test

SPH0641LU4H-1 (Knowles)

Here is breakout board

Pinout