Hi @JtotheF , your aim is to decode the PDM (pulse density modulated) output of the MEMS microphone and convert into analog signal, right? Before using I2S protocol, which is based on PCM (pulse code modulated) protocol, you first need to convert PDM into PCM data format. I'm not an expert on CS43L22 device, but I don't think this is a pure digital codec, so you should do the conversion PDM-to-PCM via software. On ST site, there is a free conversion tool at this link. I can also see that there are a few examples online, if you have not already checked them (here / here, for example), involving the control of the CS43L22 via STM32. Regards
