I have a setup made of 13 imx rt1062 (teensy 4.1) with an SPH0645 I2S microphone and MAX98357A I2S speaker amplifier.
I am trying to get a synchronized emission-reception of sound between the boards. The problem is that the audio library for teensy is a bit wonky and I was unable to get a triggering precision better than ~3ms. This is way to high for my application (where the delay due to the propagation of sound is important), which need an error of maximum ~20µs.
Also, i want to avoid increasing the sampling frequency to avoid increasing the number of samples for the same recording time.
What is the best way to get this synchronisation?
