Debug strategy on "ep0 out was already available" issue #2610
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whowechina
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Hey, I design open source rhythm music arcade cons based on rp2040.
One of them implements HID (NKRO and Gamepad) and CDC interfaces. CDC serial port 0 is for stdio and CDC serial port 1 is for other purpose. Now I'm facing "ep0 out was already available" (printed on stdio before the system freezes) issue. (project: https://github.com/whowechina/chu_pico)
It happens mostly after second or third time the Windows (host) side opens the HID device.
I'm not sure if this issue causes system freeze, or a system freeze causes this issue.
I don't know where to start.
Any friend here give me some advices, thank you very much.
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