How to write non-blocking I2S code

[Geekachuqt]

Hi, I'm struggling a bit with how to write non-blocking I2S send/receive code. I'm assuming the callback functions or the availableToWrite() function is supposed to be used in some manner, but the provided examples don't really utilize these at all, making it a bit tough to discern the intended usage. Could someone possibly point me in the direction of a repository that utilizes these functions or describe the general intended usage?

I've seen talk of using while(i2s.availableToWrite()){i2s.write() as a way to ensure that writing to the i2s buffer is only done when there is space in the buffer, but if this is the intended way, then what is the purpose of the callback functions? Is there a way to use the callback functions to write a filled buffer, and as such write more efficient code?

The general usecase is that I want to run a C++ representation of a PureData patch, sampling the ADCs, and sending/receiving I2S data from a codec.

[Geekachuqt]

Nevermind, I figured it out.

For posterity: using while(i2s.availableToWrite()){i2s.write()}, the write function and any other code in the while loop will trigger once per 1/samplerate seconds. Using this you can ensure that other things are also triggered in sync with writing to the dac if needed, and if you want other things to trigger asynchronously, you can simply have them execute outside of the while loop.

That said, if anyone else would like to share example code that utilizes the callbacks for more efficient processing, I'd be happy to see it.