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README.STM32.Md

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AtomVM for STM32

Prerequisites

To flash both AtomVM and your packed AVM you must use st-flash (https://github.com/texane/stlink). Make sure to follow its installation procedure before proceeding further.

Building

  • git clone libopencm3
  • cd libopencm3 && make -j4 && cd ..
  • mkdir build
  • cd build
  • cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/arm-toolchain.cmake -DLIBOPENCM3_DIR=../libopencm3 ..
  • make

You can put libopencm3 wherever you want on your PC as long as you update LIBOPENCM3_DIR to point to it.

Flashing

To flash AtomVM, use

st-flash --reset write atom-vm.bin 0x8000000

To flash your packed AVM, use

st-flash --reset write /path/to/your/packed.avm 0x8080000

Right now AtomVM expects to find the AVM at the address 0x808000. On a STM32 Discovery board this means that the 1MB of flash will be split in 512KB available for the program and 512KB available for the packed AVM. If for any reason you want to modify this, you can change AVM_ADDRESS and AVM_FLASH_MAX_SIZE defines in main.c.

Printing

By default, stdout and stderr are printed on USART2. On the STM32F4Discovery board, you can see them using a TTL-USB with the TX pin connected to board's pin PA2 (USART2 RX). Baudrate is 115200 and serial transmission is 8N1 with no flow control.

Changing device

The default build is based on the STM32F4Discovery board chip (stm32f407vgt6). If you want to target a different chip, pass the -DDEVICE flag when invoking cmake. For example, to use the STM32F429Discovery, pass -DDEVICE=stm32f429zit6