Hi,
following my previous UAC1 USB input interface from the daisy, I have been experimenting with tinyusb library for a more polished and comprehensive solution. Ended up with a UAC2 48KHz/16bit stereo in and out plus serial in and out. This is based on the tinyusb library with a custom wrapper. As most of my work lately, this is a joint effort from Claude and ChatGPT. It works well as far as I tested it although there is no explicit feedback EP for audio in or out (let me know if you get any noticeable audio drops or if you know how to implement such feedback EP). block size should be 48 samples to fit the 1mS USB frame. Not tested with other block sizes or sample rates.
I stripped the code from my big project so it may not be 100% clean. I will try to make a blank project with just the USB part. I am using BOOT_SRAM option but it should work fine with default Flash.
seed_usb.zip (1.3 MB)