Scamp3 USB not working on windows after latest release

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Scamp3 USB not working on windows after latest release

Forum: Open Discussion

Creator: Stefan James

Created: 2025-09-17

Updated: 2025-09-18

Stefan James - 2025-09-17

Hi, I've updated my scamp boards with the latest Udamonic firmware, but Windows 10/11 is unable to detect the USB-CDC and returns Unknown USB Device (Invalid configuration descriptor). Rolling back to the previous Scamp3 release works fine.

I have no trouble running the latest version firmware on Linux. Could this be a windows-only issue with the latest FlashForth release?

Last edit: Stefan James 2025-09-17

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Mikael Nordman - 2025-09-17

Yes, there seems to be a problem with windows. It refuses to handle different sizes of in(16) and out(8) end points.
Works fine on Linux and I suppose on OSX since John is an Apple guy.
I will update the end points to be the same size.

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Stefan James - 2025-09-17

Great, thanks Mikael.

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Stefan James - 2025-09-18

Hi Mikael,

John has updated the scamp firmware and I've just tried it, but unfortunately the USB problem on windows persists.

Regards,
Stefan.

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Mikael Nordman - 2025-09-18

John has made a small copy-paste error in the USB descriptor. I asked him to fix it.

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