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_ESP32C6
        range 32 16352 if IDF_TARGET_ESP32C6
        range 32 32768 if IDF_TARGET_ESP32P4
        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_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.

endmenu  # Ultra Low Power (ULP) Co-processor