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MicroPython port to STM32 MCUs
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==============================
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This directory contains the port of MicroPython to ST's line of STM32Fxxx
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microcontrollers. It is based on the STM32Cube HAL library and currently
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supports: STM32F401, STM32F405, STM32F411, STM32F429, STM32F746.
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The officially supported boards are the line of pyboards: PYBv1.0 and PYBv1.1
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(both with STM32F405), and PYBLITEv1.0 (with STM32F411). See
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[micropython.org/pyboard](http://www.micropython.org/pyboard/) for further
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details.
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Other boards that are supported include ST Discovery and Nucleo boards.
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See the boards/ subdirectory, which contains the configuration files used
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to build each individual board.
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Build instructions
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------------------
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An ARM compiler is required for the build, along with the associated binary
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utilities. The default compiler is `arm-none-eabi-gcc`, which is available for
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Arch Linux via the package `arm-none-eabi-gcc`, for Ubuntu via instructions
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[here](https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa), or
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see [here](https://launchpad.net/gcc-arm-embedded) for the main GCC ARM
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Embedded page. The compiler can be changed using the `CROSS_COMPILE` variable
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when invoking `make`.
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To build for a given board, run:
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$ make BOARD=PYBV11
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The default board is PYBV10 but any of the names of the subdirectories in the
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`boards/` directory can be passed as the argument to `BOARD=`. The above command
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should produce binary images in the `build-PYBV11/` subdirectory (or the
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equivalent directory for the board specified).
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You must then get your board/microcontroller into DFU mode. On the pyboard
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connect the 3V3 pin to the P1/DFU pin with a wire (they are next to each
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other on the bottom left of the board, second row from the bottom) and then
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reset (by pressing the RST button) or power on the board. Then flash the
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firmware using the command:
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$ make BOARD=PYBV11 deploy
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This will use the included `tools/pydfu.py` script. You can use instead the
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`dfu-util` program (available [here](http://dfu-util.sourceforge.net/)) by
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passing `USE_PYDFU=0`:
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$ make BOARD=PYBV11 USE_PYDFU=0 deploy
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If flashing the firmware does not work it may be because you don't have the
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correct permissions. Try then:
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$ sudo make BOARD=PYBV11 deploy
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Or using `dfu-util` directly:
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$ sudo dfu-util -a 0 -d 0483:df11 -D build-PYBV11/firmware.dfu
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### Flashing the Firmware with stlink
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ST Discovery or Nucleo boards have a builtin programmer called ST-LINK. With
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these boards and using Linux or OS X, you have the option to upload the
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`stmhal` firmware using the `st-flash` utility from the
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[stlink](https://github.com/texane/stlink) project. To do so, connect the board
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with a mini USB cable to its ST-LINK USB port and then use the make target
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`deploy-stlink`. For example, if you have the STM32F4DISCOVERY board, you can
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run:
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$ make BOARD=STM32F4DISC deploy-stlink
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The `st-flash` program should detect the USB connection to the board
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automatically. If not, run `lsusb` to determine its USB bus and device number
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and set the `STLINK_DEVICE` environment variable accordingly, using the format
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`<USB_BUS>:<USB_ADDR>`. Example:
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$ lsusb
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[...]
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Bus 002 Device 035: ID 0483:3748 STMicroelectronics ST-LINK/V2
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$ export STLINK_DEVICE="002:0035"
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$ make BOARD=STM32F4DISC deploy-stlink
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### Flashing the Firmware with OpenOCD
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Another option to deploy the firmware on ST Discovery or Nucleo boards with a
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ST-LINK interface uses [OpenOCD](http://openocd.org/). Connect the board with
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a mini USB cable to its ST-LINK USB port and then use the make target
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`deploy-openocd`. For example, if you have the STM32F4DISCOVERY board:
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$ make BOARD=STM32F4DISC deploy-openocd
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The `openocd` program, which writes the firmware to the target board's flash,
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is configured via the file `stmhal/boards/openocd_stm32f4.cfg`. This
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configuration should work for all boards based on a STM32F4xx MCU with a
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ST-LINKv2 interface. You can override the path to this configuration by setting
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`OPENOCD_CONFIG` in your Makefile or on the command line.
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Accessing the board
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-------------------
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Once built and deployed, access the MicroPython REPL (the Python prompt) via USB
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serial or UART, depending on the board. For the pyboard you can try:
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$ picocom /dev/ttyACM0
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