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Basic FFT code for MEMS microphones

The code is based on https://github.com/y2kblog/NUCLEO-L476RG_DFSDM_PDM-Mic with the following modifications:

  • Use TrueSTUDIO instead of SW4STM32.
  • DFSDM-related parameters on CubeMX.
  • Support two MEMS microphones.
  • Output single-shot data when the user button is pressed.
  • Output FFT, raw data and filtered data.