esp-idf/components/freemodbus/Kconfig

menu "Modbus configuration"

    config FMB_COMM_MODE_RTU_EN
        bool "Enable Modbus stack support for RTU mode"
        default y
        help
                Enable RTU Modbus communication mode option for Modbus serial stack.

    config FMB_COMM_MODE_ASCII_EN
        bool "Enable Modbus stack support for ASCII mode"
        default y
        help
                Enable ASCII Modbus communication mode option for Modbus serial stack.

    config FMB_MASTER_TIMEOUT_MS_RESPOND
        int "Slave respond timeout (Milliseconds)"
        default 150
        range 50 400
        help
                If master sends a frame which is not broadcast, it has to wait sometime for slave response.
                if slave is not respond in this time, the master will process timeout error.

    config FMB_MASTER_DELAY_MS_CONVERT
        int "Slave conversion delay (Milliseconds)"
        default 200
        range 50 400
        help
                If master sends a broadcast frame, it has to wait conversion time to delay,
                then master can send next frame.

    config FMB_QUEUE_LENGTH
        int "Modbus serial task queue length"
        range 0 200
        default 20
        help
                Modbus serial driver queue length. It is used by event queue task.
                See the serial driver API for more information.

    config FMB_SERIAL_TASK_STACK_SIZE
        int "Modbus serial task stack size"
        range 768 8192
        default 2048
        help
                Modbus serial task stack size for event queue task.
                It may be adjusted when debugging is enabled (for example).

    config FMB_SERIAL_BUF_SIZE
        int "Modbus serial task RX/TX buffer size"
        range 0 2048
        default 256
        help
                Modbus serial task RX and TX buffer size for UART driver initialization.
                This buffer is used for modbus frame transfer. The Modbus protocol maximum
                frame size is 256 bytes. Bigger size can be used for non standard implementations.

    config FMB_SERIAL_ASCII_BITS_PER_SYMB
        int "Number of data bits per ASCII character"
        default 8
        range 7 8
        depends on FMB_COMM_MODE_ASCII_EN
        help
                This option defines the number of data bits per ASCII character.

    config FMB_SERIAL_ASCII_TIMEOUT_RESPOND_MS
        int "Response timeout for ASCII communication mode (ms)"
        default 1000
        range 300 2000
        depends on FMB_COMM_MODE_ASCII_EN
        help
                This option defines response timeout of slave in milliseconds for ASCII communication mode.
                Thus the timeout will expire and allow the master’s program to handle the error.

    config FMB_SERIAL_TASK_PRIO
        int "Modbus serial task priority"
        range 3 10
        default 10
        help
                Modbus UART driver event task priority.
                The priority of Modbus controller task is equal to (CONFIG_FMB_SERIAL_TASK_PRIO - 1).

    config FMB_CONTROLLER_SLAVE_ID_SUPPORT
        bool "Modbus controller slave ID support"
        default n
        help
                Modbus slave ID support enable.
                When enabled the Modbus <Report Slave ID> command is supported by stack.

    config FMB_CONTROLLER_SLAVE_ID
        hex "Modbus controller slave ID"
        range 0 4294967295
        default 0x00112233
        depends on FMB_CONTROLLER_SLAVE_ID_SUPPORT
        help
                Modbus slave ID value to identify modbus device
                in the network using <Report Slave ID> command.
                Most significant byte of ID is used as short device ID and
                other three bytes used as long ID.

    config FMB_CONTROLLER_NOTIFY_TIMEOUT
        int "Modbus controller notification timeout (ms)"
        range 0 200
        default 20
        help
                Modbus controller notification timeout in milliseconds.
                This timeout is used to send notification about accessed parameters.

    config FMB_CONTROLLER_NOTIFY_QUEUE_SIZE
        int "Modbus controller notification queue size"
        range 0 200
        default 20
        help
                Modbus controller notification queue size.
                The notification queue is used to get information about accessed parameters.

    config FMB_CONTROLLER_STACK_SIZE
        int "Modbus controller stack size"
        range 0 8192
        default 4096
        help
                Modbus controller task stack size. The Stack size may be adjusted when
                debug mode is used which requires more stack size (for example).

    config FMB_EVENT_QUEUE_TIMEOUT
        int "Modbus stack event queue timeout (ms)"
        range 0 500
        default 20
        help
                Modbus stack event queue timeout in milliseconds. This may help to optimize
                Modbus stack event processing time.

    config FMB_TIMER_PORT_ENABLED
        bool "Modbus slave stack use timer for 3.5T symbol time measurement"
        default y
        help
                If this option is set the Modbus stack uses timer for T3.5 time measurement.
                Else the internal UART TOUT timeout is used for 3.5T symbol time measurement.

    config FMB_TIMER_GROUP
        int "Modbus Timer group number"
        range 0 1
        default 0
        help
                Modbus Timer group number that is used for timeout measurement.

    config FMB_TIMER_INDEX
        int "Modbus Timer index in the group"
        range 0 1
        default 0
        help
                Modbus Timer Index in the group that is used for timeout measurement.

    config FMB_TIMER_ISR_IN_IRAM
        bool "Place timer interrupt handler into IRAM"
        default n
        select UART_ISR_IN_IRAM
        help
                This option places Modbus timer IRQ handler into IRAM.
                This allows to avoid delays related to processing of non-IRAM-safe interrupts
                during a flash write operation (NVS updating a value, or some other
                flash API which has to perform an read/write operation and disable CPU cache).
                This option has dependency with the UART_ISR_IN_IRAM option which places UART interrupt
                handler into IRAM to prevent delays related to processing of UART events.

endmenu