Threading I2S & PDM

[CameronCode22]

Hi, I have been reading through the documentation supplied in the docs section. Firstly, it is great and clear.

I am trying to create a device that uses the voice recognition model by dspotter paired with the rp2040 Arduino Nano. I would also like to play audio via I2S once a trigger is called.

I faced an error when putting these two elements together: Error Message: Mutex: 0x2000A4D0, Not allowed in ISR context

After searching the Mutex in mbed_os documents. I could see that:

The Mutex methods cannot be called from interrupt service routines (ISR). In the current version of Mbed OS, if you attempt to use a mutex from within an ISR, it will treat that as a fatal system error, and you will see an error.

I believe this library solves that. However after reading through I can see you have implemented thread safe methods for SPI, Wire and Serial. What would suggest I do as I am using 2 different protocols? Is this now pushing me towards using both cores and is that threading or am I moving into the realm of something else. Apologies for my broad questioning. But I am getting really stuck. And I think I am floating around the solution. But have no clear path :)