USB_HID_ERR_DESC_PARSE embedded protocol_error ai_generated true

USB HID: Report descriptor parsing failed at byte 12

ID: embedded/usb-hid-descriptor-parsing-error

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80%Fix Rate
87%Confidence
1Evidence
2024-03-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
USB HID class driver v2.5.0 active — — —
TinyUSB v0.15.0 active — — —

Root Cause

The HID report descriptor contains an unexpected or malformed tag, such as a short item with an invalid size field.

generic

中文

HID报告描述符包含意外或格式错误的标签，例如短项的大小字段无效。

Official Documentation

https://www.usb.org/document-library/hid-usage-tables-12

Workarounds

  1. 85% success Validate the HID report descriptor using a tool like HID Descriptor Tool, then correct the binary: ensure all items have proper lengths (e.g., `0x05 0x01` for Usage Page, not `0x05 0x01 0x00`) 
    Validate the HID report descriptor using a tool like HID Descriptor Tool, then correct the binary: ensure all items have proper lengths (e.g., `0x05 0x01` for Usage Page, not `0x05 0x01 0x00`)
  2. 70% success Add a fallback descriptor in firmware that skips malformed items: `if (desc_byte == 0xFE) { skip_item(); } else { parse_item(); }` 
    Add a fallback descriptor in firmware that skips malformed items: `if (desc_byte == 0xFE) { skip_item(); } else { parse_item(); }`

中文步骤

  1. Validate the HID report descriptor using a tool like HID Descriptor Tool, then correct the binary: ensure all items have proper lengths (e.g., `0x05 0x01` for Usage Page, not `0x05 0x01 0x00`)
  2. Add a fallback descriptor in firmware that skips malformed items: `if (desc_byte == 0xFE) { skip_item(); } else { parse_item(); }`

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Buffer size does not affect descriptor parsing; the error is due to invalid content, not insufficient memory.

  2. 99% fail

    Optimization levels do not change the binary content of the descriptor; parsing logic remains the same.