If you need an example, how to use PDM microphones (MICs) on STM32 MCU and how to bring the voice/sound via network to a host computer (PC) - here is my project:
https://github.com/tjaekel/PortentaH7_VFR_CubeIDE
Here is a YouTube video with a demonstration:
https://youtu.be/HZ2tHTENgCg
it is based on Portenta-H7 (STM32H747) (with breakout board or using the vision shield), but I post it here because: it is NOT based on Arduino drivers, nor Arduino IDE! It is an STM32 Cube HAL based project, for STM32CubeIDE, a regular STM HW/FW project like a NUCLEO board.
What it does (it is a pretty heavy/large project):
- it uses PDM MICs and send it via network (via VBAN): get it via network and route the PDM voice to your laptop speaker, record it with tools (it appears like a sound card interface on PC)
- it has an UART command interpreter: use commands to enable MIC, to control amplification of MIC etc.
- it runs a web server where you can also enter commands
- it provides a "Pico-C" interpreter: write scripts in C-code language, directly on MCU, without a need for a compiler (like Python scripts, directly on MCU)
- some more stuff, like SD Card (e.g. used for "Pico-C" scripts), with a file system (FAT32)
- SPI and I2C interfaces
- use ADC to measure MCU internal voltage references and temperature
- use ADC to measure voltages on (two) external analog pins
- use QSPI flash (I use it for "man" pages: get more help about Console Commands)
- program and recover the PMIC power controller on this board or another board (maybe bricked)
- change to low power mode command
- use PWM (2x) to control RC servo motors (tilt motors for two axis)
Have fun with it (or use as reference "how to do").
