PDM Data to I2S on nrf5340

Question

Hello, 
 I'm using an Adafruit PDM microphone on nrf5340 audio dk. 
 The code of the PDM Microphone part has been completed, and I can successfully receive the PDM Microphone data. 
 Next, I want to convert the data received from PDM Microphone into I2S audio data, but I can't find a sample for reference. 
 Is it feasible to convert PDM data to I2S audio data on nrf5340? Is there any relevant sample for reference?

ovrebekk · Accepted Answer

Hi 
 The PDM module automatically converts the PDM data to PCM for you, you don't have to do this yourself. 
 Please read through the module operation chapter from the product specification for more information about this. If you search for "PCM" you will find a couple of references to this in the documentation. 
 LandyWang said: I don't quite understand the meaning here, as long as I2S is set to 16-bit mono, can I directly transmit PDM data as I2S audio? 
 This hasn't been explicitly tested so I can't guarantee it, but in theory the PDM data should be compatible with the I2S module as long as you make sure to configure the I2S interface to use 16-bit mono data. The PDM module provides 16-bit mono PCM samples, so if you can configure the I2S interface to use 16-bit mono PCM data you should be able to forward the data directly without any conversion. 
 Best regards Torbjørn

PDM Data to I2S on nrf5340

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