RDD! USB HID Report Descriptor Decoder Icon

RDD! USB HID Report Descriptor Decoder

Create C structures from USB HID Report Descriptors

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This will read a USB Human Interface Device (HID) report descriptor from the specified input file then attempt to decode it and, optionally, create a C language header file from it. It also does some minimal sanity checks to verify that the report descriptor is valid. The input file can be a binary file or a text file (for example, an existing C header file). If it is a text file, it will concatenate all the printable-hex-like text that it finds on each line (until the first non-hex sequence is found) into a single string of hex digits, and then attempt to decode that string. You can feed it an existing C header file and it will decode it as long as you have all the hex strings (e.g. 0x0F, 0x0Fb2) at the beginning of each line. Commas (,) and semicolons (;) are ignored.

RDD! USB HID Report Descriptor Decoder Web Site


  • Decodes all the USB HID descriptors currently published by usb.org
  • Converts HID Report Descriptor into C language structure declarations
  • Highlights common errors such as redundant descriptor tags, field size errors etc
  • Accepts binary or textual input (for example existing C structure definitions)
  • Decodes vendor-specific descriptors (if you supply a simple definition file)


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