Use Speaker and Mic at the same time

[yujonglee]

M5Unified/examples/Basic/Microphone/Microphone.ino

Lines 38 to 40 in cf1aec3

	/// Since the microphone and speaker cannot be used at the same time, turn off the speaker here.
	M5.Speaker.end();
	M5.Mic.begin();

Not super familiar with this space, but I am curious what's blocking us from using them together. ESP32S3 has 2 I2S controller, and there's some comments saying it worked.

Any comments on this would be super helpful.

[lovyan03]

Hello, @yujonglee
This is because there were no cases where speakers and microphones were used simultaneously when the development of M5Unified started.

We are considering this as a future issue, but if you want to use speakers and microphones simultaneously right now, you will need to implement it yourself without using M5Unified.

[yujonglee]

@lovyan03 Thank you for the comment!

Based on the schematic, it seems like single I2S channel is shared.
Could you kindly confirm that the implementation would be using single I2S as full-duplex mode?

[lovyan03]

Thank you for the information.

I understand everything, but the current implementation does not support full-duplex mode, so if you need the functionality immediately, please use the ESP-IDF I2S driver yourself.