Linux Driver for MP23DB01HP PDM Digital Microphone

[farid]

I'm looking for instructions on interfacing MP23DB01HP Microphone to Cortex-A7 on STM32MP157 through I2S bus.

The application note AN5027 is a good starting point but does not mention how to integrate with Linux on Cortex-A7.

I've modified the devcie tree to connect Microphone to I2S1 bus but couldn't figure out the Microphone driver to link to devcie tree.

Any help is much appreciated.

[AG.8]

Hi @farid​ , the drivers provided by ST are only from imus and environmental sensors:

https://github.com/STMicroelectronics/STMems_Linux_IIO_drivers/tree/linux-4.4.y-gh/drivers/iio

But I found and example of PDM mic interface in Linux here:

https://github.com/mkj/pru-mic

Also this link looks interesting, since the interduce of the MP34DT05 microphone is the same as the MP23DB01HP one.

https://www.acmesystems.it/roadrunner_pdmic

If you want a direct support you might try also on the Linux page of ST sensor.

AG

[farid]

Hi AG8,

Thanks for your help.

I was able to implement the DMIC driver using the DFSDM peripheral, following the AN5027 and STM32MP157C-EV1 board, but I ran into a problem.. DFSDM Clock on pin PB13 (DFSDM1_CKOUT) is not generating.

I wonder if anyone has connected DMIC using DFSDM peripheral on STM32MP157-DK1/DK2 or OSD32MP1-RED board?