Phil Quinton wrote:
> When an audio stream starts (play), 12 urbs get sent (very close
> together) to the main isosynchronous end point

They are submitted to the endpoint's queue.  The actual transmission
is managed by the controller's hardware and happens later, once per
microframe.

> This is causing a buffer overrun on my DIY usb audio device.

This sounds like a bug in your firmware.


Regards,
Clemens

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