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Damien George 683df1c8d5 drivers/onewire: Enable pull-up when init'ing the 1-wire pin. 6 years ago
bare-arm all: Move BYTES_PER_WORD definition from ports to py/mpconfig.h 6 years ago
cc3200 cc3200: Initialise variable to zero to prevent compiler warnings. 6 years ago
docs docs/library/gc: Fix grammar and improve readability of gc.threshold(). 6 years ago
drivers drivers/onewire: Enable pull-up when init'ing the 1-wire pin. 6 years ago
esp8266 esp8266/machine_rtc: Use correct arithmetic for aligning RTC mem len. 6 years ago
examples examples/embedding: Use core-provided KeyboardInterrupt object. 6 years ago
extmod extmod/moduzlib: decompress: Remove stale "(void)n_args". 6 years ago
lib stmhal: Move pybstdio.c to lib/utils/sys_stdio_mphal.c for common use. 6 years ago
logo logo/1bit-logo A black & white version of the logo 6 years ago
minimal py: Add LOAD_SUPER_METHOD bytecode to allow heap-free super meth calls. 6 years ago
mpy-cross mpy-cross/Makefile: Guard "override undefine" by test for make feature. 6 years ago
pic16bit stmhal: Move pybstdio.c to lib/utils/sys_stdio_mphal.c for common use. 6 years ago
py py/mpconfig.h: Remove spaces in "Micro Python" and remove blank line. 6 years ago
qemu-arm qemu-arm/Makefile: Include relevant sources in list for qstr extraction. 6 years ago
stmhal stmhal/boards/stm32f405.ld: Increase FLASH_TEXT to end of 1MiB flash. 6 years ago
teensy teensy/Makefile: Include relevant sources in list for qstr extraction. 6 years ago
tests tests: Auto detect floating point capabilites of the target. 6 years ago
tools various: Spelling fixes 6 years ago
unix unix/ Update descriptions of readline and TLS options. 6 years ago
windows windows: Convert to use core-provided version of built-in import(). 6 years ago
zephyr zephyr/machine_pin: Use native Zephyr types for Zephyr API calls. 6 years ago
.gitattributes gitattributes: Remove obsolete lines. 6 years ago
.gitignore docs: Modify Makefile and indexes to generate cPy-differences pages. 6 years ago
.gitmodules lib/berkeley-db-1.xx: Add Berkeley DB 1.85 as a submodule. 7 years ago
.travis.yml travis: Change an stmhal rule to build PYBV11 instead of default PYBV10. 6 years ago
ACKNOWLEDGEMENTS ACKNOWLEDGEMENTS: Change backer 905 info, replace city with name. 6 years ago CODECONVENTIONS: docs: Markup for None/True/False. 6 years ago Link to contrib guidelines and code conventions. 8 years ago
LICENSE Add license header to (almost) all files. 9 years ago README: Improve description of precompiled bytecode; mention mpy-cross. 6 years ago

Build Status Coverage Status

The MicroPython project

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.

MicroPython can execute scripts in textual source form or from precompiled bytecode, in both cases either from an on-device filesystem or "frozen" into the MicroPython executable.

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.
  • mpy-cross/ -- the MicroPython cross-compiler which is used to turn scripts into precompiled bytecode.
  • 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 PyPI. 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), set MICROPY_PY_USSL to 1.

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.