esp-idf/components/usb/Kconfig

menu "USB-OTG"
    depends on SOC_USB_OTG_SUPPORTED

    config USB_HOST_CONTROL_TRANSFER_MAX_SIZE
        int "Largest size (in bytes) of transfers to/from default endpoints"
        default 256
        help
            Each USB device attached is allocated a dedicated buffer for its OUT/IN transfers to/from the device's
            control endpoint. The maximum size of that buffer is determined by this option. The limited size of the
            transfer buffer have the following implications:
            - The maximum length of control transfers is limited
            - Device's with configuration descriptors larger than this limit cannot be supported

    choice USB_HOST_HW_BUFFER_BIAS
        prompt "Hardware FIFO size biasing"
        default USB_HOST_HW_BUFFER_BIAS_BALANCED
        help
            The underlying hardware has size adjustable FIFOs to cache USB packets on reception (IN) or for
            transmission (OUT). The size of these FIFOs will affect the largest MPS (maximum packet size) and the
            maximum number of packets that can be cached at any one time. The hardware contains the following
            FIFOS: RX (for all IN packets), Non-periodic TX (for Bulk and Control OUT packets), and Periodic TX
            (for Interrupt and Isochronous OUT packets). This configuration option allows biasing the FIFO sizes
            towards a particular use case, which may be necessary for devices that have endpoints with large MPS.
            The MPS limits for each biasing are listed below:

            Balanced:
            - IN (all transfer types), 408 bytes
            - OUT non-periodic (Bulk/Control), 192 bytes (i.e., 3 x 64 byte packets)
            - OUT periodic (Interrupt/Isochronous), 192 bytes

            Bias IN:
            - IN (all transfer types), 600 bytes
            - OUT non-periodic (Bulk/Control), 64 bytes (i.e., 1 x 64 byte packets)
            - OUT periodic (Interrupt/Isochronous), 128 bytes

            Bias Periodic OUT:
            - IN (all transfer types), 128 bytes
            - OUT non-periodic (Bulk/Control), 64 bytes (i.e., 1 x 64 byte packets)
            - OUT periodic (Interrupt/Isochronous), 600 bytes

        config USB_HOST_HW_BUFFER_BIAS_BALANCED
            bool "Balanced"
        config USB_HOST_HW_BUFFER_BIAS_IN
            bool "Bias IN"
        config USB_HOST_HW_BUFFER_BIAS_PERIODIC_OUT
            bool "Periodic OUT"
    endchoice

    menu "Root Hub configuration"

        config USB_HOST_DEBOUNCE_DELAY_MS
            int "Debounce delay in ms"
            default 250
            help
                On connection of a USB device, the USB 2.0 specification requires a "debounce interval with a minimum
                duration of 100ms" to allow the connection to stabilize (see USB 2.0 chapter 7.1.7.3 for more details).
                During the debounce interval, no new connection/disconnection events are registered.

                The default value is set to 250 ms to be safe.

        config USB_HOST_RESET_HOLD_MS
            int "Reset hold in ms"
            default 30
            help
                The reset signaling can be generated on any Hub or Host Controller port by request from the USB System
                Software. The USB 2.0 specification requires that "the reset signaling must be driven for a minimum of
                10ms" (see USB 2.0 chapter 7.1.7.5 for more details).  After the reset, the hub port will transition to
                the Enabled state (refer to Section 11.5).

                The default value is set to 30 ms to be safe.

        config USB_HOST_RESET_RECOVERY_MS
            int "Reset recovery delay in ms"
            default 30
            help
                After a port stops driving the reset signal, the USB 2.0 specification requires that the "USB System
                Software guarantees a minimum of 10 ms for reset recovery" before the attached device is expected to
                respond to data transfers (see USB 2.0 chapter 7.1.7.3 for more details). The device may ignore any
                data transfers during the recovery interval.

                The default value is set to 30 ms to be safe.


        config USB_HOST_SET_ADDR_RECOVERY_MS
            int "SetAddress() recovery time in ms"
            default 10
            help
                "After successful completion of the Status stage, the device is allowed a SetAddress() recovery
                interval of 2 ms. At the end of this interval, the device must be able to accept Setup packets
                addressed to the new address. Also, at the end of the recovery interval, the device must not respond to
                tokens sent to the old address (unless, of course, the old and new address is the same)." See USB 2.0
                chapter 9.2.6.3 for more details.

                The default value is set to 10 ms to be safe.

    endmenu #Root Hub configuration

    # Hidden or compatibility options

    config USB_OTG_SUPPORTED
        # Invisible config kept for compatibility
        # Todo: Remove in v6.0 (IDF-8936)
        bool
        default y

    config USB_HOST_ENABLE_ENUM_FILTER_CALLBACK
        bool "Enable enumeration filter callback"
        default n
        help
            The enumeration filter callback is called before enumeration of each newly attached device. This callback
            allows users to control whether a device should be enumerated, and what configuration number to use when
            enumerating a device.

            If enabled, the enumeration filter callback can be set via 'usb_host_config_t' when calling
            'usb_host_install()'.

    config USB_HOST_EXT_HUB_SUPPORT
        depends on IDF_EXPERIMENTAL_FEATURES
        bool "Support USB HUB (Experimental)"
        default n
        help
            Feature is under development.

endmenu #USB-OTG