Hello ST Experts , I am new to STM32 development environment i had a query regarding how to interface MEMS microphone ics43432 with STM32F4xx nucleo 64 board , their clocking configurations in STM32cubeMX and the usage of PDM2PCM middleware.

[SG.4]

The 1 bit PDM data output should be converted to a 16 bit PCM data format using this and what peripherals should be used in STM32cubeMX and the obtained PCM should be converted into .wav file and display it on UART/USART

What is the process could anyone please elaborate? please help

Thanks in advance.

[Eleon BORLINI · Accepted solution]

Hi @Community member​ ,

I'm not an expert on TDK microphones, but it should be similar to ST digital MEMS microphones.

For these microphones, there are some available example that decode the PDM into PCM and stream the audio signal: in the X-CUBE-MEMSMIC1 package there is an example running on a STM32F4-Nucleo board that deploys the digital microphones on the X-NUCLEO-CCA02M2, acquiring them in PDM, decimating it in PCM and streaming the audio data on USB (folder: \Projects\STM32F401RE-Nucleo\Demonstration\CCA02M2\HP_Microphones_Streaming). In particular, please have a look to the audio_application.c, the cca02m2_audio.c and the usbd_audio_if.c files.

You could start from this example and adapt it to your microphone paying attention to the hardware connections of the board you are using.

-Eleon

[SG.4]

Thank you so much for the help Eleon .