cmake_minimum_required(VERSION 3.22)

#
# User is free to modify the file as much as necessary
#

set(CMAKE_SYSTEM_NAME               Generic)
set(CMAKE_SYSTEM_PROCESSOR          arm)

# Some default GCC settings
# arm-none-eabi- must be part of path environment
set(TOOLCHAIN_PREFIX                arm-none-eabi-)
set(FLAGS                           "-fdata-sections -ffunction-sections -Wl,--gc-sections")
set(CPP_FLAGS                       "${FLAGS} -fno-rtti -fno-exceptions -fno-threadsafe-statics")

set(CMAKE_C_FLAGS                   ${FLAGS})
set(CMAKE_CXX_FLAGS                 ${CPP_FLAGS})

set(CMAKE_C_COMPILER                ${TOOLCHAIN_PREFIX}gcc)
set(CMAKE_ASM_COMPILER              ${CMAKE_C_COMPILER})
set(CMAKE_CXX_COMPILER              ${TOOLCHAIN_PREFIX}g++)
set(CMAKE_OBJCOPY                   ${TOOLCHAIN_PREFIX}objcopy)
set(CMAKE_SIZE                      ${TOOLCHAIN_PREFIX}size)

set(CMAKE_EXECUTABLE_SUFFIX_ASM     ".elf")
set(CMAKE_EXECUTABLE_SUFFIX_C       ".elf")
set(CMAKE_EXECUTABLE_SUFFIX_CXX     ".elf")

set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)

list(APPEND CMAKE_MODULE_PATH "{{sr:cmake_path}}")
message("Build CMAKE_MODULE_PATH: " ${CMAKE_MODULE_PATH})

# Core project settings
project(flexptp-tiva)
enable_language(C CXX ASM)
message("Build type: " ${CMAKE_BUILD_TYPE})

# Setup compiler settings
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_C_EXTENSIONS ON)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS ON)

# Core MCU flags, CPU, instruction set and FPU setup
set(cpu_PARAMS ${cpu_PARAMS}
    -mthumb

    # Other parameters
    # -mcpu, -mfloat, -mfloat-abi, ...
    -mcpu=cortex-m4
	-mfpu=fpv4-sp-d16
	-mfloat-abi=hard
)

# Linker script
set(linker_script_SRC ${linker_script_SRC}
    ${CMAKE_CURRENT_SOURCE_DIR}/tm4c1294ncpdt.ld
)

# Sources
set(sources_SRCS ${sources_SRCS}
    ${CMAKE_CURRENT_SOURCE_DIR}/Startup/tm4c1294ncpdt_startup.s
    ${CMAKE_CURRENT_SOURCE_DIR}/Startup/tm4c1294ncpdt_system.c
)

# Include directories
set(include_c_DIRS ${include_c_DIRS}
    ${CMAKE_CURRENT_SOURCE_DIR}
	${CMAKE_CURRENT_SOURCE_DIR}/Inc
    ${CMAKE_CURRENT_SOURCE_DIR}/Middlewares/Inc
    ${CMAKE_CURRENT_SOURCE_DIR}/Src
)
set(include_cxx_DIRS)
set(include_asm_DIRS)

# Symbols definition for all compilers
set(symbols_SYMB)

# Symbols definition for each compiler
set(symbols_c_SYMB
    PART_TM4C1294NCPDT   
    TARGET_IS_TM4C129_RA0
    UART_BUFFERED
    DEBUG
    _FREERTOS
    RTOS_FREERTOS=1
    UART_TX_BUFFER_SIZE=8192
    gcc
)
set(symbols_cxx_SYMB)
set(symbols_asm_SYMB)

# Link directories and names of libraries
set(link_DIRS)
set(link_LIBS freertos_kernel)

# Compiler options
set(compiler_OPTS)

# Linker options
set(linker_OPTS)

# Link directories setup
# Must be before executable is added
link_directories(${CMAKE_PROJECT_NAME} ${link_DIRS})

# Create an executable object type
add_executable(${CMAKE_PROJECT_NAME})

# Add sources to executable
target_sources(${CMAKE_PROJECT_NAME} PUBLIC ${sources_SRCS})

# Add include paths
target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE
    ${include_DIRS}
    $<$<COMPILE_LANGUAGE:C>: ${include_c_DIRS}>
    $<$<COMPILE_LANGUAGE:CXX>: ${include_cxx_DIRS}>
    $<$<COMPILE_LANGUAGE:ASM>: ${include_asm_DIRS}>
)

# Add Middlewares
add_subdirectory(Middlewares)
add_compile_definitions(CMSIS_device_header="${device_header}") # exported from Middlewares

# Add Drivers
add_subdirectory(Drivers)

# Add Src
add_subdirectory(Src)

# Add Modules
add_subdirectory(Modules)

# Add project symbols (macros)
target_compile_definitions(${CMAKE_PROJECT_NAME} PRIVATE
    ${symbols_SYMB}
    $<$<COMPILE_LANGUAGE:C>: ${symbols_c_SYMB}>
    $<$<COMPILE_LANGUAGE:CXX>: ${symbols_cxx_SYMB}>
    $<$<COMPILE_LANGUAGE:ASM>: ${symbols_asm_SYMB}>

    # Configuration specific
    $<$<CONFIG:Debug>:DEBUG>
    $<$<CONFIG:Release>: >
)

# Add linked libraries
target_link_libraries(${CMAKE_PROJECT_NAME} ${link_LIBS})

# Compiler options
target_compile_options(${CMAKE_PROJECT_NAME} PRIVATE
    ${cpu_PARAMS}
    ${compiler_OPTS}
    -Wall
    -Wextra
    #-Wpedantic
    -Wno-strict-prototypes
    -Wno-unused-parameter
    -ffunction-sections
    $<$<COMPILE_LANGUAGE:C>: >
    $<$<COMPILE_LANGUAGE:CXX>:

    # -Wno-volatile
    # -Wold-style-cast
    # -Wuseless-cast
    # -Wsuggest-override
    >
    $<$<COMPILE_LANGUAGE:ASM>:-x assembler-with-cpp -MMD -MP>
    $<$<CONFIG:Debug>:-O0 -g3 -ggdb>
    $<$<CONFIG:Release>:-Og -g0>
)

# Linker options
target_link_options(${CMAKE_PROJECT_NAME} PRIVATE
    -T${linker_script_SRC}
    ${cpu_PARAMS}
    ${linker_OPTS}
    -Wl,-Map=${CMAKE_PROJECT_NAME}.map
    #-u _printf_float # STDIO float formatting support (remove if not used)
    #--specs=nano.specs
    -Wl,--start-group
    #-lc
    -lm
    #-lstdc++
    #-lsupc++
    -Wl,--end-group
    -Wl,-z,max-page-size=8 # Allow good software remapping across address space (with proper GCC section making)
    -Wl,--print-memory-usage
)

# Execute post-build to print size, generate hex and bin
add_custom_command(TARGET ${CMAKE_PROJECT_NAME} POST_BUILD
    COMMAND ${CMAKE_SIZE} $<TARGET_FILE:${CMAKE_PROJECT_NAME}>
    COMMAND ${CMAKE_OBJCOPY} -O ihex $<TARGET_FILE:${CMAKE_PROJECT_NAME}> ${CMAKE_PROJECT_NAME}.hex
    COMMAND ${CMAKE_OBJCOPY} -O binary $<TARGET_FILE:${CMAKE_PROJECT_NAME}> ${CMAKE_PROJECT_NAME}.bin
)