This is the documentation for the latest development branch of MicroPython and may refer to features that are not available in released versions.

If you are looking for the documentation for a specific release, use the drop-down menu on the left and select the desired version.

Extending MicroPython in C

This chapter describes options for implementing additional functionality in C, but from code written outside of the main MicroPython repository. The first approach is useful for building your own custom firmware with some project-specific additional modules or functions that can be accessed from Python. The second approach is for building modules that can be loaded at runtime.

Please see the library section for more information on building core modules that live in the main MicroPython repository.

• MicroPython external C modules
  • Structure of an external C module
  • Basic example
  • Compiling the cmodule into MicroPython
  • Module usage in MicroPython
• Native machine code in .mpy files
  • Supported features and limitations
  • Defining a native module
  • Minimal example
  • Compiling the module
  • Module usage in MicroPython
  • Further examples