#euphemism any idea of the maximum
languid fulcrum
Has been a bit of a journey. Am on PlatformIO now, using https://arduino-pico.readthedocs.io/en/latest/
Got audio written to SD card
There were a few pops or something, so I started looking into multicore + a double buffer
Idea being one core is dedicated to the SD write while the other is handling the microphone callback.
"Idea being". Having some issues with it at the moment.
But, the RP2040 stamp has 8MB of flash, and in my use case I think that would be sufficient to generate a complete recording of someone's message, and then when the frog phone is "hung up" that would run some code to transfer the recording to the SD card.