How do I auto clear i2s circular buffer in callbacks?

[AstrickHarren]

I could be wrong but I think esp-idf supports auto_clear_after_cb which prevents repeating audio when data are unavailable for now. I'm writing an UDP music streamer and I want to stop playing (sending zero to i2s) instead of every time when there is a network instability i2s sends data in the circular buffer and effectively repeats last 100ms or so. What should I do in this case?

[bjoernQ]

The current implementation expects you to fill the buffer early enough to avoid an underrun - in your case the user code is expected to clear the buffer - in any case currently not handling the situation (i.e. not refilling the buffer) will result in an error returned by the implementation

[AstrickHarren]

how do I clear buffer if I don't have a way to get notified? (like a callback) Or maybe I didn't find a way

[bjoernQ]

You are expected to poll frequently (see https://docs.espressif.com/projects/rust/esp-hal/1.0.0-beta.0/esp32c6/esp_hal/i2s/master/index.html#i2s-read ) - there is also an async API:

esp-hal/qa-test/src/bin/embassy_i2s_sound.rs

Lines 104 to 114 in c8da165

	let mut transaction = i2s_tx.write_dma_circular_async(buffer).unwrap();
	loop {
	for i in 0..filler.len() {
	filler[i] = data[(idx + i) % data.len()];
	}
	println!("Next");
	let written = transaction.push(&filler).await.unwrap();
	idx = (idx + written) % data.len();
	println!("written {}", written);
	}