FreeRTOS-Kernel/configuration/kconfig.config

config SELECT_CORTEX_M
    bool "Using a Cortex M?"
    default y

config configCPU_CLOCK_HZ
    int "What is the CPU clock frequency? (hz)"
    default 20000000
    help
        In most cases, configCPU_CLOCK_HZ must be set to the frequency of the clock
        that drives the peripheral used to generate the kernels periodic tick interrupt.
        The default value is set to 20MHz and matches the QEMU demo settings.  Your
        application will certainly need a different value so set this correctly.
        This is very often, but not always, equal to the main system clock frequency

config SELECT_SYSTICKER
    bool "Sys Tick timer clocked at a different frequency than CPU?"
    depends on SELECT_CORTEX_M
    default n
    help
        By default ARM Cortex-M ports generate the RTOS tick interrupt from the
        Cortex-M SysTick timer. Most Cortex-M MCUs run the SysTick timer at the same
        frequency as the MCU itself - when that is the case configSYSTICK_CLOCK_HZ is
        not needed and should be left undefined. If the SysTick timer is clocked at a
        different frequency to the MCU core then set configCPU_CLOCK_HZ to the MCU clock
        frequency, as normal, and configSYSTICK_CLOCK_HZ to the SysTick clock
        frequency.

config configSYSTICK_CLOCK_HZ
    int "Sys Tick timer frequency? (hz)"
    depends on SELECT_SYSTICKER

config configTICK_RATE_HZ
    int "FreeRTOS Scheduler Tick Rate (hz)"
    default 100
    
config configUSE_PREEMPTION
    bool "Enable pre-emptive scheduling"
    default y
    help
        https://www.freertos.org/single-core-amp-smp-rtos-scheduling.html

config configUSE_TIME_SLICING
    bool "Configure the scheduler to switch between ready tasks of equal priority"
    default y
    help
        https://freertos.org/single-core-amp-smp-rtos-scheduling.html

config configUSE_PORT_OPTIMISED_TASK_SELECTION
    bool "Use an optmised task selector"
    default n
    help
        run using an algorithm optimised to the instruction set of the target hardware -
        normally using a count leading zeros assembly instruction.  Set to 0 to select
        the next task to run using a generic C algorithm that works for all FreeRTOS
        ports.  Not all FreeRTOS ports have this option.  Defaults to 0 if left
        undefined

config USE_TICKLESS_IDLE
    bool "Use the low power tickless mode"
    default n
    help
        https://www.freertos.org/low-power-tickless-rtos.html

config configMAX_PRIORITIES
    int "How many priorities are needed in this system?"
    default 5
    help
        Determine the number of priority levels needed in this system.
        The lowest priority level is 0.  The highest priority level is configMAX_PRIORITIES-1.

config configMINIMAL_STACK_SIZE
    int "The stack size of the idle task"
    default 128

config configMAX_TASK_NAME_LEN
    int "Maximum task name length"
    default 16

config configUSE_16_BIT_TICKS
    bool "Use 16-bit ticks (limit maximum delay to 65535 ticks)"
    default n

config configIDLE_SHOULD_YIELD
    bool "Place idle tasks at a lower priority than 0 priority application tasks"
    default n

config configTASK_NOTIFICATION_ARRAY_ENTRIES
    int "Number of Notifications enabled per task"
    default 1

config configQUEUE_REGISTRY_SIZE
    int "Maximum number of queues and semaphores references from the queue registery"
    default 0

config configENABLE_BACKWARD_COMPATIBILITY
    bool "Enable API backward compatibility with FreeRTOS before v9"
    default n

config configNUM_THREAD_LOCAL_STORAGE_POINTERS
    int "Number of pointers available for thread local storage"
    default 0
    help
        https://www.freertos.org/thread-local-storage-pointers.html

choice
    prompt "Select Stack Depth Type"
    default SELECT_UINT16

config SELECT_UINT16
    bool "Use 16-bit types for the stack depth type"
config SELECT_UINT32
    bool "Use 32-bit types for the stack depth type"
endchoice
config configSTACK_DEPTH_TYPE
    string
    default uint16_t
    default uint32_t if SELECT_UINT32


choice
    prompt "Select Message Buffer Length type"
    default SELECT_SIZE_T

config SELECT_UINT8
    bool "Maximum message buffer size of 255 bytes"
config SELECT_UINT16
    bool "Maximum message buffer size of 65535 bytes"
config SELECT_UINT32
    bool "Maximum message buffer size of 4.2GB"
config SELECT_SIZE_T
    bool "Buffer sizes limited to size_t"
endchoice
config configMESSAGE_BUFFER_LENGTH_TYPE
    string
    default size_t
    default uint8_t if SELECT_UINT8_T
    default uint16_t if SELECT_UINT16_T
    default uint32_t if SELECT_UINT32_T


config configUSE_NEWLIB_REENTRANT
    bool "Enable reentrant newlib (EXPERIMENTAL)"
    default n
    help
        Note: Newlib support has been included by popular demand, but is not used or
        tested by the FreeRTOS maintainers themselves. FreeRTOS is not responsible for
        resulting newlib operation. User must be familiar with newlib and must provide
        system-wide implementations of the necessary stubs. Note that (at the time of
        writing) the current newlib design implements a system-wide malloc() that must
        be provided with locks.

config configUSE_TIMERS
    bool "Enable software timers"
    default y

config configTIMER_TASK_PRIORITY
    int "Timer Task priority"
    default 0
    range 0 configMAX_PRIORITIES