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mirb-stm32f4discovery

This project is experimental implementation.

What's 'mruby'

See this: https://github.com/mruby/mruby

What's 'STM32F4 Discovery'

Very low-cost ARM processor board. <img src="http://www.st.com/st-web-ui/static/active/en/fragment/product_related/rpn_information/board_photo/stm32f4_discovery.jpg"/> See this: http://www.st.com/web/en/catalog/tools/PF252419

Ready to build

get Codesourcery toolchain for ARM processor.
setup your environment variable PATH to make 'arm-none-eabi-gcc' can run.
get 'mruby' source code from <a href="https://github.com/mruby/mruby">github</a>.
build 'libmruby'.
get 'mirb-stm32f4discovery' source code.

commands:

$ git clone https://github.com/mruby/mruby.git
$ cd mruby
$ vi build_config.rb
$ make
$ cd ..
$ git clone https://github.com/crimsonwoods/mirb-stm32f4discovery.git

Edit 'build_config.rb'

edit your 'build_config.rb' to build 'libmruby'. append cross-build settings. like this:

MRuby::CrossBuild.new('stm32f407') do |conf|
  toolchain :gcc

  conf.bins = %w() # target is just only 'libmruby.a'.

  conf.cc do |cc|
    cc.command = 'arm-none-eabi-gcc'
    cc.flags = %w(
      -MD -Os
      -mthumb -mcpu=cortex-m3 -nostdlib -mfloat-abi=softfp -mfpu=fpv4-sp-d16
      -fsigned-char -fno-inline -ffunction-sections -mlittle-endian)
    cc.defines = %w(
      MRB_HEAP_PAGE_SIZE=256
      POOL_PAGE_SIZE=1000
      MRB_STR_BUF_MIN_SIZE=32
      MRB_PARSER_BUF_SIZE=256)
  end

  conf.archiver do |ar|
    ar.command = 'arm-none-eabi-ar'
  end
end

How to build

commands:

$ cd mirb-stm32f4discovery
$ make CROSS_COMPILE=arm-none-eabi-

if build succeeded, you will get an executable binary file 'build/mirb.bin'.

How to run

Use STM32 ST-LINK Utility.

Console Input/Output

"USART2" is assigned as standard input/output port. On STM32F4 Discovery board, 'PA3' and 'PA2' is assigned as "USART2" (PA2=USART2_TX / PA3=USART2_RX). You can connect level conversion board to that pins.

License

MIT License