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.

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.

Hi, were you able to successfully decode the pdm audio to pcm using the Arduino IDE?. Im working with im69d130 mic where im unable to convert the pdm to pcm format.

.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_PDM),

Would the I2S_MODE_PDM work on the arduino ide?