ESP32 Forum

Hello!
I have an ICS-41350 MEMS microphone with PDM output and a project to record and play the sound with an ESP32 mcu board. There are two main parts: 1.recording from mic and getting data in pdm format 2.proccessing the audio and and sending it to DAC.
for the first I'm gonna use I2S.h library in arduino framework. For the second I have two options: using external hardware or bit-banging the pdm audio to analog signals. First one is currently not an option and I really would like to use the second option.
is there any libraries or Freertos APIs for this purpose (or similar) ?
I'd appreciate the help.

The ESP32 I2S peripheral actually can do PDM to PCM decoding in hardware. I have no idea if that functionality is exposed in Arduino libraries, though.

ESP_Sprite wrote: ↑

Wed Jul 20, 2022 4:16 am

The ESP32 I2S peripheral actually can do PDM to PCM decoding in hardware. I have no idea if that functionality is exposed in Arduino libraries, though.

Is there any other way to use the PDM to PCM decoding in other frameworks?

As most other frameworks are based on ESP-IDF, you should be able to use the ESP-IDF I2S driver there as well.