CMakeLists.txt

# CMake template file
#

cmake_minimum_required(VERSION 3.15.3)

# Optional: print out extra messages to see what is going on. Comment it to have less verbose messages
set(CMAKE_VERBOSE_MAKEFILE ON)

# Path to toolchain file. This one has to be before 'project()' below
set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/arm-none-eabi-clang.cmake)

# Setup project, output and linker file
project(${PROJECT} C CXX ASM)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)

set(PROJECT_ELF ${PROJECT}.elf)

set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_C_EXTENSIONS OFF)

# Optional: issue a message to be sure it uses the correct toolchain file.
message(STATUS "CMAKE_TOOLCHAIN_FILE is: ${CMAKE_TOOLCHAIN_FILE}")

# List of source files
set(SRC_FILES
        main.cpp
)

# Build the executable based on the source files
add_executable(${PROJECT_ELF} ${SRC_FILES})

# List of compiler defines, prefix with -D compiler option
target_compile_definitions(${PROJECT_ELF} PRIVATE
)

# List of include directories
target_include_directories(${PROJECT_ELF} PRIVATE
)

# Compiler options
target_compile_options(${PROJECT_ELF} PRIVATE
        --config armv6m_soft_nofp.cfg
        -fdata-sections
        -ffunction-sections
        -Wall
)

target_link_libraries(${PROJECT_ELF} librtt_stdio.a) 

# Linker options
target_link_options(${PROJECT_ELF} PRIVATE
        --config armv6m_soft_nofp.cfg
        -fdata-sections
        -ffunction-sections
        -T${CMAKE_SOURCE_DIR}/nrf52840.ld
)

# Optional: Print executable size as part of the post build process
add_custom_command(TARGET ${PROJECT_ELF}
        POST_BUILD
        COMMAND ${CMAKE_SIZE_UTIL} ${PROJECT}.elf
)

# Optional: Create hex and bin files after the build
add_custom_command(TARGET ${PROJECT_ELF}
        POST_BUILD
        COMMAND ${CMAKE_OBJCOPY} -O ihex   "${PROJECT}.elf" "${PROJECT}.hex"
        COMMAND ${CMAKE_OBJCOPY} -O binary "${PROJECT}.elf" "${PROJECT}.bin" 
)