Working with F prime with Ardunio

[coreymitterer]

I am working with an Arduino Portenta with an M4 and M7 chip inside of it and was wondering if it was possible to use F prime with it all ive seen on the readme and online seem to give me no clear answer on how to do it.

[ethancheez]

You would need to add a new toolchain for the board. Add a file like portentaH7.cmake inside of fprime-arduino/cmake/toolchain/ with its contents that look like this:

####
# portentaH7.cmake:
#
# Toolchain file setup for building F prime for the Portenta H7 hardware platform. This must, by definition, include the
# Arduino framework in order to ensure that basic functions of the Portenta H7 hardware platform are available. This
# toolchain will build the core Portenta H7 Arduino libraries, and include the headers as part of the target include headers.
####
set(CMAKE_CXX_STANDARD 14)
add_compile_options(-std=c++14)

set(CMAKE_SYSTEM_NAME "Generic")
set(CMAKE_SYSTEM_PROCESSOR "arm")
set(CMAKE_CROSSCOMPILING 1)
set(FPRIME_PLATFORM "ArduinoFw")
set(FPRIME_USE_BAREMETAL_SCHEDULER ON)
set(ARDUINO_BUILD_PROPERTIES)

# Prevent test program compiling
set(CMAKE_C_COMPILER_WORKS 1)
set(CMAKE_CXX_COMPILER_WORKS 1)

set(ARDUINO_FQBN "arduino:mbed_portenta:envie_m7")
add_compile_options(-D_BOARD_PORTENTA_H7)
# Run the base arduino setup which should detect settings!
include("${CMAKE_CURRENT_LIST_DIR}/support/arduino-support.cmake")

There needs to be a few things that need to be modified with the drivers and other stuff to support this board, but this would get you started.

P.S. I ran into an interesting error with the arduino-cli-cmake-wrapper miner.py file when trying to generate for this board. If you get the same error, I changed this as a temporary (and possibly wrong) fix:

def identify_line(
    stage: Stage,
    stages: Dict[Stage, List[str]],
    match: Callable[[str], bool],
    single: bool = True,
) -> str:
    """Identify a line based on the given stage and criteria.

    Args:
    - stage: The current stage to identify lines for.
    - stages: A dictionary mapping stages to lists of lines.
    - match: A function that checks if a line matches a certain condition.
    - single: If True (default), raises an exception if multiple matching lines are found.

    Returns:
    - The identified line (str).

    Raises:
    - MissingStageException: If no lines are found for the given stage.
    - MultipleInvocationException: If multiple matching lines are found when 'single' is True.
    """
    stage_lines = stages.get(stage, [])
    matching_lines = [line for line in stage_lines if match(line)]
    if not matching_lines:
        return stage_lines[0]
        # raise MissingStageException(stage)
    if single and len(matching_lines) > 1:
        print('\n'.join(matching_lines))
        raise MultipleInvocationException
    return matching_lines[0]

And then I managed to get to a 100% build, but ended with this error:

[ 98%] Built target LedBlinker_Top
[ 98%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime/Os/Generic/DefaultPriorityQueue.cpp.obj
[ 99%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/Main.cpp.obj
[ 99%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime/Os/Stub/DefaultFile.cpp.obj
[ 99%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime-baremetal/fprime-baremetal/Os/Baremetal/DefaultCpu.cpp.obj
[ 99%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime-baremetal/fprime-baremetal/Os/Baremetal/DefaultMemory.cpp.obj
[100%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime-arduino/Arduino/Os/DefaultConsole.cpp.obj
[100%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime-baremetal/fprime-baremetal/Os/Baremetal/DefaultTask.cpp.obj
[100%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime-baremetal/fprime-baremetal/Os/Baremetal/DefaultMutex.cpp.obj
[100%] Building CXX object LedBlinker/CMakeFiles/LedBlinker.dir/__/fprime-arduino/Arduino/Os/DefaultRawTime.cpp.obj
[100%] Linking CXX executable ../bin/portentaH7/LedBlinker.elf
/home/ethancheez/.arduino15/packages/arduino/hardware/mbed_portenta/4.2.1/variants/PORTENTA_H7_M7/libs/libmbed.a(mbed_boot_gcc_arm.o): In function `__wrap_main':
mbed_boot_gcc_arm.c:(.text.__wrap_main+0x0): undefined reference to `main'
collect2: error: ld returned 1 exit status
gmake[2]: *** [LedBlinker/CMakeFiles/LedBlinker.dir/build.make:340: bin/portentaH7/LedBlinker.elf] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:7462: LedBlinker/CMakeFiles/LedBlinker.dir/all] Error 2
gmake: *** [Makefile:136: all] Error 2
[ERROR] CMake erred with return code 2

I currently don't have much time to test right now, but hopefully these pointers can get you started in debugging.