Case study

ntrig-calib: reconstructing Surface Pro 3 digitizer calibration

ntrig-calib reconstructs the Surface Pro 3 N-Trig digitizer's calibration exchange as a Linux Python script. The project describes Ghidra analysis of CalibG4.exe and NCPTransportInterface.dll, including NCP framing, START_CALIB and GET_STATUS commands and HID report transport. The author reports a working fix on one device while documenting uncertain response behavior and calibration longevity.

Targets: Binary · Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 4
Last commit: 2026-03-17
Language: Python
License (GitHub): AGPL-3.0

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a demo observed; no download method found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: Surface Pro 3 with an N-Trig DuoSense digitizer running Linux.
Testing evidence: The author reports success on one device; the NCP response path has not been checked across multiple devices or kernel versions.
Limits: Calibration may drift again, and success conditions are not fully understood.
License: AGPL-3.0 License.

Cite

BibTeX

@misc{ntrig-calib-surface-pro-3-case,
  title = {{ntrig-calib: reconstructing Surface Pro 3 digitizer calibration}},
  howpublished = {\url{https://github.com/thiswillbeyourgithub/ntrig-calib}},
  url = {https://github.com/thiswillbeyourgithub/ntrig-calib},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/ntrig-calib-surface-pro-3-case/}}
}

Plain text

ntrig-calib: reconstructing Surface Pro 3 digitizer calibration. https://github.com/thiswillbeyourgithub/ntrig-calib (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/ntrig-calib-surface-pro-3-case/

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Primary sources

README.md GitHub · thiswillbeyourgithub/ntrig-calib · Revision 03256e1