0f6f86ca49
Prior to this commit the USB CDC used the USB start-of-frame (SOF) IRQ to regularly check if buffered data needed to be sent out to the USB host. This wasted resources (CPU, power) if no data needed to be sent. This commit changes how the USB CDC transmits buffered data: - When new data is first available to send the data is queued immediately on the USB IN endpoint, ready to be sent as soon as possible. - Subsequent additions to the buffer (via usbd_cdc_try_tx()) will wait. - When the low-level USB driver has finished sending out the data queued in the USB IN endpoint it calls usbd_cdc_tx_ready() which immediately queues any outstanding data, waiting for the next IN frame. The benefits on this new approach are: - SOF IRQ does not need to run continuously so device has a better chance to sleep for longer, and be more responsive to other IRQs. - Because SOF IRQ is off, current consumption is reduced by a small amount, roughly 200uA when USB is connected (measured on PYBv1.0). - CDC tx throughput (USB IN) on PYBv1.0 is about 2.3 faster (USB OUT is unchanged). - When USB is connected, Python code that is executing is slightly faster because SOF IRQ no longer interrupts continuously. - On F733 with USB HS, CDC tx throughput is about the same as prior to this commit. - On F733 with USB HS, Python code is about 5% faster because of no SOF. As part of this refactor, the serial port should no longer echo initial characters when the serial port is first opened (this only used to happen rarely on USB FS, but on USB HS is was more evident). |
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docs | ||
drivers | ||
examples | ||
extmod | ||
lib | ||
logo | ||
mpy-cross | ||
ports | ||
py | ||
tests | ||
tools | ||
.gitattributes | ||
.gitignore | ||
.gitmodules | ||
.travis.yml | ||
ACKNOWLEDGEMENTS | ||
CODECONVENTIONS.md | ||
CONTRIBUTING.md | ||
LICENSE | ||
README.md |
README.md
The MicroPython project
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 micropython.org.
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 http://github.com/micropython/pyboard 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.
- ports/unix/ -- a version of MicroPython that runs on Unix.
- ports/stm32/ -- a version of MicroPython that runs on the PyBoard and similar STM32 boards (using ST's Cube HAL drivers).
- ports/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 http://docs.micropython.org (be sure to select needed board/port at the bottom left corner).
Additional components:
- ports/bare-arm/ -- a bare minimum version of MicroPython for ARM MCUs. Used mostly to control code size.
- ports/teensy/ -- a version of MicroPython that runs on the Teensy 3.1 (preliminary but functional).
- ports/pic16bit/ -- a version of MicroPython for 16-bit PIC microcontrollers.
- ports/cc3200/ -- a version of MicroPython that runs on the CC3200 from TI.
- ports/esp8266/ -- a version of MicroPython that runs on Espressif's ESP8266 SoC.
- ports/esp32/ -- a version of MicroPython that runs on Espressif's ESP32 SoC.
- ports/nrf/ -- a version of MicroPython that runs on Nordic's nRF51 and nRF52 MCUs.
- extmod/ -- additional (non-core) modules implemented in C.
- tools/ -- various tools, including the pyboard.py 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, gcc, 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):
$ git submodule update --init
$ cd ports/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 MicroPython ports may require some dependencies installed.
For Unix port, libffi
library and pkg-config
tool are required. On
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. This may be required to enable extra features or capabilities, and in recent versions of MicroPython, these may be enabled by default. To build these additional dependencies, first fetch git submodules for them:
$ git submodule update --init
Use the same command to get the latest versions of dependencies, as
they are updated from time to time. After that, in the port directory
(e.g. ports/unix/
), 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 enable/disable use of dependencies, edit
ports/unix/mpconfigport.mk
file, which has inline descriptions of the options.
For example, to build SSL module (required for upip
tool described above,
and so enabled by dfeault), MICROPY_PY_USSL
should be set to 1.
For some ports, building required dependences is transparent, and happens automatically. They still need to be fetched with the git submodule command above.
The STM32 version
The "stm32" port requires an ARM compiler, arm-none-eabi-gcc, and associated bin-utils. For those using Arch Linux, you need arm-none-eabi-binutils, arm-none-eabi-gcc and arm-none-eabi-newlib packages. Otherwise, try here: https://launchpad.net/gcc-arm-embedded
To build:
$ git submodule update --init
$ cd ports/stm32
$ 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/pydfu.py
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 README.md file in the ports/stm32/ directory for further details.
Contributing
MicroPython is an open-source project and welcomes contributions. To be productive, please be sure to follow the Contributors' Guidelines and the Code Conventions. Note that MicroPython is licenced under the MIT license, and all contributions should follow this license.