Increase CFG_TUH_ENUMERATION_BUFSIZE so that USB devices with long descriptors are recognized #10281
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tannewt
approved these changes
Apr 23, 2025
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Some devices have very long USB configuration descriptors due to the number of interfaces they offer. For instance, enabling the USB CDC data stream on CircuitPython (
usb_cdc.enable(console=True, data=True)) pushes the descriptor to 284 bytes, which is greater than CircuitPython currently allocates. This change will allow devices with long descriptors to be recognized by the USB host module.Tested on a Feather RP2040 with USB Type A Host.
The downside is that this uses more memory. It would be nice if this buffer could be dynamically allocated, but TinyUSB doesn't use malloc so I'm not sure how you'd do this.