STRING(TOLOWER ${STM32_FAMILY} STM32_FAMILY_LOWER)

IF(STM32_FAMILY STREQUAL "F1")
    SET(CMSIS_STARTUP_PREFIX startup_stm32f)
    SET(CMSIS_HEADERS system_stm32f1xx.h core_cm3.h stm32f1xx.h)
    SET(CMSIS_LINKER_SCRIPT_NAME stm32f1.ld.in)
    SET(CMSIS_SRCS system_stm32f1xx.c)
ELSEIF(STM32_FAMILY STREQUAL "F4")
    SET(CMSIS_STARTUP_PREFIX startup_stm32f)
    SET(CMSIS_HEADERS system_stm32f4xx.h core_cm4.h stm32f4xx.h)
    SET(CMSIS_LINKER_SCRIPT_NAME stm32f4.ld.in)
    SET(CMSIS_SRCS system_stm32f4xx.c)
ENDIF()

IF(STM32_CHIP_TYPE OR STM32_CHIP)
    IF(NOT STM32_CHIP_TYPE)
        STM32_GET_CHIP_TYPE(${STM32_CHIP} STM32_CHIP_TYPE)
        IF(NOT STM32_CHIP_TYPE)
            MESSAGE(FATAL_ERROR "Unknown chip: ${STM32_CHIP}. Try to use STM32_CHIP_TYPE directly.")
        ENDIF()
        MESSAGE(STATUS "${STM32_CHIP} is ${STM32_CHIP_TYPE} device")
    ENDIF()
    STRING(TOLOWER ${STM32_CHIP_TYPE} STM32_CHIP_TYPE_LOWER)
    
    SET(CMSIS_STARTUP_NAME ${CMSIS_STARTUP_PREFIX}${STM32_CHIP_TYPE_LOWER}.s)
ENDIF()

FIND_PATH(CMSIS_INCLUDE_DIR ${CMSIS_HEADERS}
    PATH_SUFFIXES include stm32${STM32_FAMILY_LOWER}
)

FIND_FILE(CMSIS_LINKER_SCRIPT ${CMSIS_LINKER_SCRIPT_NAME} 
    PATHS ${CMAKE_FIND_ROOT_PATH}
    PATH_SUFFIXES share/cmsis cmsis
)

FOREACH(CMSIS_SRC ${CMSIS_SRCS})
    FIND_FILE(CMSIS_SRC_FILE NAMES ${CMSIS_SRC} PATHS ${CMAKE_FIND_ROOT_PATH} PATH_SUFFIXES share/cmsis cmsis)
    LIST(APPEND CMSIS_SOURCES ${CMSIS_SRC_FILE})
ENDFOREACH()

IF(STM32_CHIP_TYPE)
    FIND_FILE(CMSIS_STARTUP_SOURCE
        ${CMSIS_STARTUP_NAME}
        PATHS ${CMAKE_FIND_ROOT_PATH}/share/cmsis/
    )
    LIST(APPEND CMSIS_SOURCES ${CMSIS_STARTUP_SOURCE})
ENDIF()

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(CMSIS DEFAULT_MSG CMSIS_INCLUDE_DIR CMSIS_LINKER_SCRIPT CMSIS_SOURCES)