SET(CMAKE_C_FLAGS "-mcpu=cortex-m4 -mthumb -mno-thumb-interwork -fno-common -mfloat-abi=hard -mfpu=fpv4-sp-d16 -ffunction-sections -fdata-sections -fomit-frame-pointer -mabi=aapcs -fno-unroll-loops -fsingle-precision-constant -flto -falign-functions=16" CACHE INTERNAL "c compiler flags")
SET(CMAKE_CXX_FLAGS "$(CMAKE_C_FLAGS)" CACHE INTERNAL "cxx compiler flags")
SET(CMAKE_ASM_FLAGS "-mthumb -mno-thumb-interwork -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -x assembler-with-cpp -flto" CACHE INTERNAL "asm compiler flags")

SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gc-sections -mthumb -mno-thumb-interwork -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -nostartfiles -flto" CACHE INTERNAL "executable linker flags")
SET(CMAKE_MODULE_LINKER_FLAGS "-mthumb -mno-thumb-interwork -mcpu=cortex-m4 -mfpu=fpv4-sp-d16" CACHE INTERNAL "module linker flags")
SET(CMAKE_SHARED_LINKER_FLAGS "-mthumb -mno-thumb-interwork -mcpu=cortex-m4 -mfpu=fpv4-sp-d16" CACHE INTERNAL "shared linker flags")
SET(STM32_CHIP_TYPES 476xE 496xG CACHE INTERNAL "stm32l4 chip types")
SET(STM32_CODES "476.." "496..")

MACRO(STM32_GET_CHIP_TYPE CHIP CHIP_TYPE)
    STRING(REGEX REPLACE "^[sS][tT][mM]32[lL](4[79]6.[EG]).+$" "\\1" STM32_CODE ${CHIP})
    SET(INDEX 0)
    FOREACH(C_TYPE ${STM32_CHIP_TYPES})
        LIST(GET STM32_CODES ${INDEX} CHIP_TYPE_REGEXP)
        IF(STM32_CODE MATCHES ${CHIP_TYPE_REGEXP})
            SET(RESULT_TYPE ${C_TYPE})
        ENDIF()
        MATH(EXPR INDEX "${INDEX}+1")
    ENDFOREACH()
    SET(${CHIP_TYPE} ${RESULT_TYPE})
ENDMACRO()

MACRO(STM32_GET_CHIP_PARAMETERS CHIP FLASH_SIZE RAM_SIZE)
    STRING(REGEX REPLACE "^[sS][tT][mM]32[lL]4[79]6.([EG]).*$" "\\1" STM32_SIZE_CODE ${CHIP})
    
    IF(STM32_SIZE_CODE STREQUAL "G")
        SET(FLASH "1024K")
    ELSEIF(STM32_SIZE_CODE STREQUAL "E")
        SET(FLASH "512K")
    ENDIF()
    
    STM32_GET_CHIP_TYPE(${CHIP} TYPE)
    
    IF(${TYPE} STREQUAL "496xG")
        SET(RAM "320K")
    ELSEIF(${TYPE} STREQUAL "476xE")
	SET(RAM "128K")
    ENDIF()
    
    SET(${FLASH_SIZE} ${FLASH})
    SET(${RAM_SIZE} ${RAM})
ENDMACRO()

FUNCTION(STM32_SET_CHIP_DEFINITIONS TARGET CHIP_TYPE)
    LIST(FIND STM32_CHIP_TYPES ${CHIP_TYPE} TYPE_INDEX)
    IF(TYPE_INDEX EQUAL -1)
        MESSAGE(FATAL_ERROR "Invalid/unsupported STM32L4 chip type: ${CHIP_TYPE}")
    ENDIF()
        
    add_definitions("-DSTM32L4 -DSTM32L${CHIP_TYPE}")
ENDFUNCTION()