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wtf is x-cube-usb-pd?

peng-zhihui/x-cube-usb-pd — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2018-02-14

★ 56CAudience · developerComplexity · 5/5DormantSetup · hard

TL;DR

Firmware that turns a low-cost STM32 microcontroller into a full USB Power Delivery controller, letting a device negotiate charging voltage and speed over USB-C without a dedicated PD chip.

Mindmap

mindmap
  root((repo))
    What it does
      Implements USB-PD protocol
      Negotiates power over USB-C
      Runs on STM32F072
    Tech stack
      C
      STM32F072
      STUSB1602
    Use cases
      Build custom USB-C chargers
      Build power banks
      Smart power negotiation
    Audience
      Hardware engineers
      Firmware developers
    Variants
      Dedicated chip version
      Discrete component version

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Build a custom USB-C charger or power bank that negotiates voltage and current automatically.

REASON 2

Add smart USB Power Delivery support to a device using a low-cost STM32 microcontroller instead of a proprietary chip.

REASON 3

Use the discrete-component hardware variant to cut manufacturing cost on a custom power-switching design.

REASON 4

Study a real, standards-certified implementation of the USB-PD protocol as a reference.

What's in the stack?

CSTM32F072STUSB1602

How it stacks up

peng-zhihui/x-cube-usb-pdalphapixel/eric-graham-1987-juggler-raytracer-1.0redteamfortress/pplshade
Stars565454
LanguageCCC
Last pushed2018-02-14——
MaintenanceDormant——
Setup difficultyhardhardhard
Complexity5/52/55/5
Audiencedevelopergeneralresearcher

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · hard Time to first run · 1day+

Requires building or sourcing one of two certified hardware variants and flashing the STM32F072 microcontroller.

Yoink these prompts

Prompt 1
Walk me through flashing this USB-PD firmware onto an STM32F072-based board.
Prompt 2
Explain the difference between the STUSB1602 chip version and the discrete-component version of this firmware.
Prompt 3
Help me understand how USB-PD negotiation works using this firmware as a reference.
Prompt 4
What hardware do I need to build a custom USB-C charger using this open-source firmware?

Frequently asked questions

wtf is x-cube-usb-pd?

Firmware that turns a low-cost STM32 microcontroller into a full USB Power Delivery controller, letting a device negotiate charging voltage and speed over USB-C without a dedicated PD chip.

What language is x-cube-usb-pd written in?

Mainly C. The stack also includes C, STM32F072, STUSB1602.

Is x-cube-usb-pd actively maintained?

Dormant — no commits in 2+ years (last push 2018-02-14).

How hard is x-cube-usb-pd to set up?

Setup difficulty is rated hard, with roughly 1day+ to a first successful run.

Who is x-cube-usb-pd for?

Mainly developer.

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