Hi Amit, commit ef11982dd7a657512c362242508bb4021e0d67b6 (Add support for interrupt EP) actually broke testusb for MUSB when MUSB is the gadget.
The reason is that we're requesting an endpoint with a 64-byte FIFO, but later deciding to use the same endpoint with wMaxPacketSize set to 1024 and MUSB errors out because the endpoint was selected for 64-byte only. This only happens when trying to set alternate setting 2 and it's pretty easy to trigger. I'll be away next week, but I plan on continue to track this down after that, unless you beat me to it. cheers -- balbi
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