F407 Discovery - MEMS microphone -DSP-DAC-Headphone (DMA and PDM to PCM, double buffer, half buffer)

[TombrownBottom]

I have been looking for software that can take as an input, the PDM output from the MEMS microphone, and convert it to PCM.

I then want to implement a double buffer using DMA, to reduce CPU load and output the audio data to the DAC on this PCB.

Once I have this running I want to experiment with DSP, filters, delay lines etc...

If no software is available, does anyone know if a process is defined, with comments on why each element of the process is as it is for learning purposes?

Thanks in advance

[BarryWhit]

LMGTFY

AN5027: Interfacing pdm digital microphones using stm32 

Also (specifically for the F4/F7, from Here)

https://www.st.com/en/embedded-software/x-cube-audio.html

https://www.st.com/en/embedded-software/x-cube-audio-kit.html

[TombrownBottom]

Thanks for that, but Im looking for something more basic for a beginner. Some sample code with process for learning purposes.

I'll certainly take a look at the links and do some head sratching....