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micropython/ports/minimal/README.md
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# The minimal port | |
This port is intended to be a minimal MicroPython port that actually runs. | |
It can run under Linux (or similar) and on any STM32F4xx MCU (eg the pyboard). | |
## Building and running Linux version | |
By default the port will be built for the host machine: | |
$ make | |
To run the executable and get a basic working REPL do: | |
$ make run | |
## Building for an STM32 MCU | |
The Makefile has the ability to build for a Cortex-M CPU, and by default | |
includes some start-up code for an STM32F4xx MCU and also enables a UART | |
for communication. To build: | |
$ make CROSS=1 | |
If you previously built the Linux version, you will need to first run | |
`make clean` to get rid of incompatible object files. | |
Building will produce the build/firmware.dfu file which can be programmed | |
to an MCU using: | |
$ make CROSS=1 deploy | |
This version of the build will work out-of-the-box on a pyboard (and | |
anything similar), and will give you a MicroPython REPL on UART1 at 9600 | |
baud. Pin PA13 will also be driven high, and this turns on the red LED on | |
the pyboard. | |
## Building without the built-in MicroPython compiler | |
This minimal port can be built with the built-in MicroPython compiler | |
disabled. This will reduce the firmware by about 20k on a Thumb2 machine, | |
and by about 40k on 32-bit x86. Without the compiler the REPL will be | |
disabled, but pre-compiled scripts can still be executed. | |
To test out this feature, change the `MICROPY_ENABLE_COMPILER` config | |
option to "0" in the mpconfigport.h file in this directory. Then | |
recompile and run the firmware and it will execute the frozentest.py | |
file. |