Case study

LEGO SPIKE medium motor: reconstructing its UART handshake

An STM32U545RE project reconstructs the LEGO SPIKE medium motor's UART startup exchange from observations of the original hub. It reproduces the handshake and heartbeat so the motor sends speed, single-turn position and accumulated angle frames at 115200 baud.

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

Stars: 3
Last commit: 2026-03-28
Language: C
License (GitHub): MIT

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: LEGO SPIKE or MINDSTORMS Robot Inventor medium motor and an STM32U545RE board.
Prerequisites: Generate the STM32 HAL drivers from the included .ioc file with MyST.
Limits: Speed and proportional position control loops remain future work.
License: MIT license.

Cite

BibTeX

@misc{lego-spike-medium-motor-u545re-case,
  title = {{LEGO SPIKE medium motor: reconstructing its UART handshake}},
  howpublished = {\url{https://github.com/ufnalski/lego_spike_medium_motor_u545re}},
  url = {https://github.com/ufnalski/lego_spike_medium_motor_u545re},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/lego-spike-medium-motor-u545re-case/}}
}

Plain text

LEGO SPIKE medium motor: reconstructing its UART handshake. https://github.com/ufnalski/lego_spike_medium_motor_u545re (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/lego-spike-medium-motor-u545re-case/

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About this entry

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Primary sources

README.md GitHub · ufnalski/lego_spike_medium_motor_u545re · Revision b4daeac