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The MicroPython project

<p align="center">
<img src="" alt="MicroPython Logo"/>

This is the MicroPython project, which aims to put an implementation
of Python 3.x on microcontrollers and small embedded systems.
You can find the official website at

WARNING: this project is in beta stage and is subject to changes of the
code-base, including project-wide name changes and API changes.

MicroPython implements the entire Python 3.4 syntax (including exceptions,
with, yield from, etc., and additionally async/await keywords from
Python 3.5). The following core datatypes are provided: str (including
basic Unicode support), bytes, bytearray, tuple, list, dict, set,
frozenset, array.array, collections.namedtuple, classes and instances.
Builtin modules include sys, time, and struct, etc. Select ports have
support for _thread module (multithreading). Note that only a subset of
Python 3 functionality is implemented for the data types and modules.

See the repository for the MicroPython
board (PyBoard), the officially supported reference electronic circuit board.

Major components in this repository:

  • py/ -- the core Python implementation, including compiler, runtime, and
    core library.
  • unix/ -- a version of MicroPython that runs on Unix.
  • stmhal/ -- a version of MicroPython that runs on the PyBoard and similar
    STM32 boards (using ST's Cube HAL drivers).
  • minimal/ -- a minimal MicroPython port. Start with this if you want
    to port MicroPython to another microcontroller.
  • tests/ -- test framework and test scripts.
  • docs/ -- user documentation in Sphinx reStructuredText format. Rendered
    HTML documentation is available at (be sure
    to select needed board/port at the bottom left corner).

Additional components:

  • bare-arm/ -- a bare minimum version of MicroPython for ARM MCUs. Used
    mostly to control code size.
  • teensy/ -- a version of MicroPython that runs on the Teensy 3.1
    (preliminary but functional).
  • pic16bit/ -- a version of MicroPython for 16-bit PIC microcontrollers.
  • cc3200/ -- a version of MicroPython that runs on the CC3200 from TI.
  • esp8266/ -- an experimental port for ESP8266 WiFi modules.
  • extmod/ -- additional (non-core) modules implemented in C.
  • tools/ -- various tools, including the module.
  • examples/ -- a few example Python scripts.

The subdirectories above may include READMEs with additional info.

"make" is used to build the components, or "gmake" on BSD-based systems.
You will also need bash and Python (at least 2.7 or 3.3).

The Unix version

The "unix" port requires a standard Unix environment with gcc and GNU make.
x86 and x64 architectures are supported (i.e. x86 32- and 64-bit), as well
as ARM and MIPS. Making full-featured port to another architecture requires
writing some assembly code for the exception handling and garbage collection.
Alternatively, fallback implementation based on setjmp/longjmp can be used.

To build (see section below for required dependencies):

$ cd unix
$ make axtls
$ make

Then to give it a try:

$ ./micropython
>>> list(5 * x + y for x in range(10) for y in [4, 2, 1])

Use CTRL-D (i.e. EOF) to exit the shell.
Learn about command-line options (in particular, how to increase heap size
which may be needed for larger applications):

$ ./micropython --help

Run complete testsuite:

$ make test

Unix version comes with a builtin package manager called upip, e.g.:

$ ./micropython -m upip install micropython-pystone
$ ./micropython -m pystone

Browse available modules on
Standard library modules come from
micropython-lib project.

External dependencies

Building Unix version requires some dependencies installed. For
Debian/Ubuntu/Mint derivative Linux distros, install build-essential
(includes toolchain and make), libffi-dev, and pkg-config packages.

Other dependencies can be built together with MicroPython. Oftentimes,
you need to do this to enable extra features or capabilities. To build
these additional dependencies, first fetch git submodules for them:

$ git submodule update --init

Use this same command to get the latest versions of dependencies, as
they are updated from time to time. After that, in unix/ dir, execute:

$ make deplibs

This will build all available dependencies (regardless whether they
are used or not). If you intend to build MicroPython with additional
options (like cross-compiling), the same set of options should be passed
to make deplibs. To actually enabled use of dependencies, edit
unix/ file, which has inline descriptions of the options.
For example, to build SSL module (required for upip tool described above),

In unix/, you can also disable some dependencies enabled
by default, like FFI support, which requires libffi development files to
be installed.

The STM version

The "stmhal" port requires an ARM compiler, arm-none-eabi-gcc, and associated
bin-utils. For those using Arch Linux, you need arm-none-eabi-binutils and
arm-none-eabi-gcc packages. Otherwise, try here:

To build:

$ cd stmhal
$ make

You then need to get your board into DFU mode. On the pyboard, connect the
3V3 pin to the P1/DFU pin with a wire (on PYBv1.0 they are next to each other
on the bottom left of the board, second row from the bottom).

Then to flash the code via USB DFU to your device:

$ make deploy

This will use the included tools/ script. If flashing the firmware
does not work it may be because you don't have the correct permissions, and
need to use sudo make deploy.
See the file in the stmhal/ directory for further details.

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