esp-idf/components/ulp/Kconfig

menu "Ultra Low Power (ULP) Co-processor"
    depends on (SOC_ULP_SUPPORTED || SOC_RISCV_COPROC_SUPPORTED || SOC_LP_CORE_SUPPORTED)

    config ULP_COPROC_ENABLED
        bool "Enable Ultra Low Power (ULP) Co-processor"
        default "n"
        help
            Enable this feature if you plan to use the ULP Co-processor.
            Once this option is enabled, further ULP co-processor configuration will appear in the menu.

    choice ULP_COPROC_TYPE
        prompt "ULP Co-processor type"
        depends on ULP_COPROC_ENABLED
        default ULP_COPROC_TYPE_RISCV if (IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3)
        help
            Choose the ULP Coprocessor type: ULP FSM (Finite State Machine) or ULP RISC-V.

        config ULP_COPROC_TYPE_FSM
            bool "ULP FSM (Finite State Machine)"
            depends on SOC_ULP_FSM_SUPPORTED
        config ULP_COPROC_TYPE_RISCV
            bool "ULP RISC-V"
            depends on SOC_RISCV_COPROC_SUPPORTED
        config ULP_COPROC_TYPE_LP_CORE
            bool "LP core RISC-V"
            depends on SOC_LP_CORE_SUPPORTED
    endchoice

    config ULP_COPROC_RESERVE_MEM
        int
        prompt "RTC slow memory reserved for coprocessor"
        depends on ULP_COPROC_ENABLED
        default 512 if IDF_TARGET_ESP32
        default 4096 if !IDF_TARGET_ESP32
        range 32 8176 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3
        range 32 16352 if IDF_TARGET_ESP32C5 || IDF_TARGET_ESP32C6
        range 32 31088 if IDF_TARGET_ESP32P4 # Some memory are reserved for ROM/RTC reserved
        help
            Bytes of memory to reserve for ULP Co-processor firmware & data.
            Data is reserved at the beginning of RTC slow memory.


    menu "ULP RISC-V Settings"
        depends on ULP_COPROC_TYPE_RISCV

        config ULP_RISCV_INTERRUPT_ENABLE
            bool
            prompt "Enable ULP RISC-V interrupts"
            default "n"
            help
                Turn on this setting to enabled interrupts on the ULP RISC-V core.

        config ULP_RISCV_UART_BAUDRATE
            int
            prompt "Baudrate used by the bitbanged ULP RISC-V UART driver"
            default 9600
            help
                The accuracy of the bitbanged UART driver is limited, it is not
                recommend to increase the value above 19200.

        config ULP_RISCV_I2C_RW_TIMEOUT
            int
            prompt "Set timeout for ULP RISC-V I2C transaction timeout in ticks."
            default 500
            range -1 4294967295
            help
                Set the ULP RISC-V I2C read/write timeout. Set this value to -1
                if the ULP RISC-V I2C read and write APIs should wait forever.
                Please note that the tick rate of the ULP co-processor would be
                different than the OS tick rate of the main core and therefore
                can have different timeout value depending on which core the API
                is invoked on.
    endmenu

    config ULP_SHARED_MEM
        depends on ULP_COPROC_TYPE_LP_CORE
        hex
        default 0x8
        help
            Size of the shared memory defined in ulp_lp_core_memory_shared.c.
            Size should be kept in-sync with the size of the struct defined there.

    config ULP_ROM_PRINT_ENABLE
        depends on ULP_COPROC_TYPE_LP_CORE && ESP_ROM_HAS_LP_ROM
        bool
        prompt "Enable print utilities from LP ROM"
        default "y"
        help
            Set this option to enable printf functionality from LP ROM. This option
            can help reduce the LP core binary size by not linking printf functionality
            from RAM code.
            Note: For LP ROM prints to work properly, make sure that the LP core boots
            from the LP ROM.

    menu "ULP Debugging Options"
        config ULP_PANIC_OUTPUT_ENABLE
            depends on ULP_COPROC_TYPE_LP_CORE && SOC_ULP_LP_UART_SUPPORTED
            bool
            prompt "Enable panic handler which outputs over LP UART"
            default "y" if IDF_TARGET_ESP32P4
            help
                Set this option to enable panic handler functionality. If this option is
                enabled then the LP Core will output a panic dump over LP UART,
                similar to what the main core does. Output depends on LP UART already being
                initialized and configured.
                Disabling this option will reduce the LP core binary size by not
                linking in panic handler functionality.

        config ULP_HP_UART_CONSOLE_PRINT
            depends on ULP_COPROC_TYPE_LP_CORE
            bool
            prompt "Route lp_core_printf to the console HP-UART"
            help
                Set this option to route lp_core_printf to the console HP-UART.
                This allows you to easily view print outputs from the LP core, without
                having to connect to the LP-UART. This option comes with the following
                limitations:

                1. There is no mutual exclusion between the HP-Core and the LP-Core accessing
                the HP-UART, which means that if both cores are logging heavily the output
                strings might get mangled together.
                2. The HP-UART can only work while the HP-Core is running, which means that
                if the HP-Core is in deep sleep, the LP-Core will not be able to print to the
                console HP-UART.

                Due to these limitations it is only recommended to use this option for easy debugging.
                For more serious use-cases you should use the LP-UART.
    endmenu

endmenu  # Ultra Low Power (ULP) Co-processor