esp-idf/components/esp32s2/Kconfig

menu "ESP32S2-specific"
    # TODO: this component simply shouldn't be included
    # in the build at the CMake level, but this is currently
    # not working so we just hide all items here
    visible if IDF_TARGET_ESP32S2

    choice ESP32S2_DEFAULT_CPU_FREQ_MHZ
        prompt "CPU frequency"
        default ESP32S2_DEFAULT_CPU_FREQ_160 if !IDF_ENV_FPGA
        default ESP32S2_DEFAULT_CPU_FREQ_FPGA if IDF_ENV_FPGA
        help
            CPU frequency to be set on application startup.

        config ESP32S2_DEFAULT_CPU_FREQ_FPGA
            depends on IDF_ENV_FPGA
            bool "FPGA"
        config ESP32S2_DEFAULT_CPU_FREQ_80
            bool "80 MHz"
        config ESP32S2_DEFAULT_CPU_FREQ_160
            bool "160 MHz"
        config ESP32S2_DEFAULT_CPU_FREQ_240
            bool "240 MHz"
    endchoice

    config ESP32S2_DEFAULT_CPU_FREQ_MHZ
        int
        default 40 if IDF_ENV_FPGA
        default 80 if ESP32S2_DEFAULT_CPU_FREQ_80
        default 160 if ESP32S2_DEFAULT_CPU_FREQ_160
        default 240 if ESP32S2_DEFAULT_CPU_FREQ_240

    menu "Cache config"

        choice ESP32S2_INSTRUCTION_CACHE_SIZE
            prompt "Instruction cache size"
            default ESP32S2_INSTRUCTION_CACHE_8KB
            help
                Instruction cache size to be set on application startup.
                If you use 8KB instruction cache rather than 16KB instruction cache,
                then the other 8KB will be added to the heap.

            config ESP32S2_INSTRUCTION_CACHE_8KB
                bool "8KB"
            config ESP32S2_INSTRUCTION_CACHE_16KB
                bool "16KB"
        endchoice

        choice ESP32S2_INSTRUCTION_CACHE_LINE_SIZE
            prompt "Instruction cache line size"
            default ESP32S2_INSTRUCTION_CACHE_LINE_32B
            help
                Instruction cache line size to be set on application startup.

            config ESP32S2_INSTRUCTION_CACHE_LINE_16B
                bool "16 Bytes"
            config ESP32S2_INSTRUCTION_CACHE_LINE_32B
                bool "32 Bytes"
        endchoice

        choice ESP32S2_DATA_CACHE_SIZE
            prompt "Data cache size"
            default ESP32S2_DATA_CACHE_0KB if !ESP32S2_SPIRAM_SUPPORT
            default ESP32S2_DATA_CACHE_8KB if ESP32S2_SPIRAM_SUPPORT
            help
                Data cache size to be set on application startup.
                If you use 0KB data cache, the other 16KB will be added to the heap
                If you use 8KB data cache rather than 16KB data cache, the other 8KB will be added to the heap

            config ESP32S2_DATA_CACHE_0KB
                depends on !ESP32S2_SPIRAM_SUPPORT
                bool "0KB"
            config ESP32S2_DATA_CACHE_8KB
                bool "8KB"
            config ESP32S2_DATA_CACHE_16KB
                bool "16KB"
        endchoice

        choice ESP32S2_DATA_CACHE_LINE_SIZE
            prompt "Data cache line size"
            default ESP32S2_DATA_CACHE_LINE_32B
            help
                Data cache line size to be set on application startup.

            config ESP32S2_DATA_CACHE_LINE_16B
                bool "16 Bytes"
            config ESP32S2_DATA_CACHE_LINE_32B
                bool "32 Bytes"
        endchoice

        config ESP32S2_INSTRUCTION_CACHE_WRAP
            bool "Enable instruction cache wrap"
            default "n"
            help
                If enabled, instruction cache will use wrap mode to read spi flash (maybe spiram).
                The wrap length equals to INSTRUCTION_CACHE_LINE_SIZE.
                However, it depends on complex conditions.

        config ESP32S2_DATA_CACHE_WRAP
            bool "Enable data cache wrap"
            default "n"
            help
                If enabled, data cache will use wrap mode to read spiram (maybe spi flash).
                The wrap length equals to DATA_CACHE_LINE_SIZE.
                However, it depends on complex conditions.

    endmenu  # Cache config

    # Note: to support SPIRAM across multiple chips, check CONFIG_SPIRAM
    # instead
    config ESP32S2_SPIRAM_SUPPORT
        bool "Support for external, SPI-connected RAM"
        default "n"
        select SPIRAM
        help
            This enables support for an external SPI RAM chip, connected in parallel with the
            main SPI flash chip.

    menu "SPI RAM config"
        depends on ESP32S2_SPIRAM_SUPPORT

        choice SPIRAM_TYPE
            prompt "Type of SPI RAM chip in use"
            default SPIRAM_TYPE_AUTO

            config SPIRAM_TYPE_AUTO
                bool "Auto-detect"

            config SPIRAM_TYPE_ESPPSRAM16
                bool "ESP-PSRAM16 or APS1604"

            config SPIRAM_TYPE_ESPPSRAM32
                bool "ESP-PSRAM32 or IS25WP032"

            config SPIRAM_TYPE_ESPPSRAM64
                bool "ESP-PSRAM64 or LY68L6400"
        endchoice

        config SPIRAM_SIZE
            int
            default -1 if SPIRAM_TYPE_AUTO
            default 2097152 if SPIRAM_TYPE_ESPPSRAM16
            default 4194304 if SPIRAM_TYPE_ESPPSRAM32
            default 8388608 if SPIRAM_TYPE_ESPPSRAM64
            default 0

        menu "PSRAM clock and cs IO for ESP32S2"
            depends on ESP32S2_SPIRAM_SUPPORT
            config DEFAULT_PSRAM_CLK_IO
                int "PSRAM CLK IO number"
                range 0 33
                default 30
                help
                    The PSRAM CLOCK IO can be any unused GPIO, user can config it based on hardware design.

            config DEFAULT_PSRAM_CS_IO
                int "PSRAM CS IO number"
                range 0 33
                default 26
                help
                    The PSRAM CS IO can be any unused GPIO, user can config it based on hardware design.
        endmenu
        config SPIRAM_FETCH_INSTRUCTIONS
            bool "Cache fetch instructions from SPI RAM"
            default n
            help
                If enabled, instruction in flash will be copied into SPIRAM.
                If SPIRAM_RODATA also enabled,
                you can run the instruction when erasing or programming the flash.

        config SPIRAM_RODATA
            bool "Cache load read only data from SPI RAM"
            default n
            help
                If enabled, radata in flash will be copied into SPIRAM.
                If SPIRAM_FETCH_INSTRUCTIONS also enabled,
                you can run the instruction when erasing or programming the flash.

        choice SPIRAM_SPEED
            prompt "Set RAM clock speed"
            default SPIRAM_SPEED_40M
            help
                Select the speed for the SPI RAM chip.

            config SPIRAM_SPEED_80M
                bool "80MHz clock speed"
            config SPIRAM_SPEED_40M
                bool "40Mhz clock speed"
            config SPIRAM_SPEED_26M
                bool "26Mhz clock speed"
            config SPIRAM_SPEED_20M
                bool "20Mhz clock speed"
        endchoice

        # insert non-chip-specific items here
        source "$IDF_PATH/components/esp_hw_support/Kconfig.spiram.common"

    endmenu

    config ESP32S2_MEMMAP_TRACEMEM
        bool
        default "n"

    config ESP32S2_MEMMAP_TRACEMEM_TWOBANKS
        bool
        default "n"

    config ESP32S2_TRAX
        bool "Use TRAX tracing feature"
        default "n"
        select ESP32S2_MEMMAP_TRACEMEM
        help
            The ESP32S2 contains a feature which allows you to trace the execution path the processor
            has taken through the program. This is stored in a chunk of 32K (16K for single-processor)
            of memory that can't be used for general purposes anymore. Disable this if you do not know
            what this is.

    config ESP32S2_TRACEMEM_RESERVE_DRAM
        hex
        default 0x8000 if ESP32S2_MEMMAP_TRACEMEM && ESP32S2_MEMMAP_TRACEMEM_TWOBANKS
        default 0x4000 if ESP32S2_MEMMAP_TRACEMEM && !ESP32S2_MEMMAP_TRACEMEM_TWOBANKS
        default 0x0

    config ESP32S2_DEBUG_OCDAWARE
        bool "Make exception and panic handlers JTAG/OCD aware"
        default y
        select FREERTOS_DEBUG_OCDAWARE
        help
            The FreeRTOS panic and unhandled exception handers can detect a JTAG OCD debugger and
            instead of panicking, have the debugger stop on the offending instruction.

    config ESP32S2_BROWNOUT_DET
        bool "Hardware brownout detect & reset"
        depends on !IDF_ENV_FPGA
        default y
        help
            The ESP32-S2 has a built-in brownout detector which can detect if the voltage is lower than
            a specific value. If this happens, it will reset the chip in order to prevent unintended
            behaviour.

    choice ESP32S2_BROWNOUT_DET_LVL_SEL
        prompt "Brownout voltage level"
        depends on ESP32S2_BROWNOUT_DET
        default ESP32S2_BROWNOUT_DET_LVL_SEL_7
        help
            The brownout detector will reset the chip when the supply voltage is approximately
            below this level. Note that there may be some variation of brownout voltage level
            between each ESP3-S2 chip.

            #The voltage levels here are estimates, more work needs to be done to figure out the exact voltages
            #of the brownout threshold levels.
        config ESP32S2_BROWNOUT_DET_LVL_SEL_7
            bool "2.44V"
        config ESP32S2_BROWNOUT_DET_LVL_SEL_6
            bool "2.56V"
        config ESP32S2_BROWNOUT_DET_LVL_SEL_5
            bool "2.67V"
        config ESP32S2_BROWNOUT_DET_LVL_SEL_4
            bool "2.84V"
        config ESP32S2_BROWNOUT_DET_LVL_SEL_3
            bool "2.98V"
        config ESP32S2_BROWNOUT_DET_LVL_SEL_2
            bool "3.19V"
        config ESP32S2_BROWNOUT_DET_LVL_SEL_1
            bool "3.30V"
    endchoice

    config ESP32S2_BROWNOUT_DET_LVL
        int
        default 1 if ESP32S2_BROWNOUT_DET_LVL_SEL_1
        default 2 if ESP32S2_BROWNOUT_DET_LVL_SEL_2
        default 3 if ESP32S2_BROWNOUT_DET_LVL_SEL_3
        default 4 if ESP32S2_BROWNOUT_DET_LVL_SEL_4
        default 5 if ESP32S2_BROWNOUT_DET_LVL_SEL_5
        default 6 if ESP32S2_BROWNOUT_DET_LVL_SEL_6
        default 7 if ESP32S2_BROWNOUT_DET_LVL_SEL_7

    choice ESP32S2_TIME_SYSCALL
        prompt "Timers used for gettimeofday function"
        default ESP32S2_TIME_SYSCALL_USE_RTC_SYSTIMER
        help
            This setting defines which hardware timers are used to
            implement 'gettimeofday' and 'time' functions in C library.

            - If both high-resolution and RTC timers are used, timekeeping will
              continue in deep sleep. Time will be reported at 1 microsecond
              resolution. This is the default, and the recommended option.
            - If only high-resolution timer is used, gettimeofday will
              provide time at microsecond resolution.
              Time will not be preserved when going into deep sleep mode.
            - If only RTC timer is used, timekeeping will continue in
              deep sleep, but time will be measured at 6.(6) microsecond
              resolution. Also the gettimeofday function itself may take
              longer to run.
            - If no timers are used, gettimeofday and time functions
              return -1 and set errno to ENOSYS.
            - When RTC is used for timekeeping, two RTC_STORE registers are
              used to keep time in deep sleep mode.

        config ESP32S2_TIME_SYSCALL_USE_RTC_SYSTIMER
            bool "RTC and high-resolution timer"
            select ESP_TIME_FUNCS_USE_RTC_TIMER
            select ESP_TIME_FUNCS_USE_ESP_TIMER
        config ESP32S2_TIME_SYSCALL_USE_RTC
            bool "RTC"
            select ESP_TIME_FUNCS_USE_RTC_TIMER
        config ESP32S2_TIME_SYSCALL_USE_SYSTIMER
            bool "High-resolution timer"
            select ESP_TIME_FUNCS_USE_ESP_TIMER
        config ESP32S2_TIME_SYSCALL_USE_NONE
            bool "None"
            select ESP_TIME_FUNCS_USE_NONE
    endchoice

    choice ESP32S2_RTC_CLK_SRC
        prompt "RTC clock source"
        default ESP32S2_RTC_CLK_SRC_INT_RC
        help
            Choose which clock is used as RTC clock source.

            - "Internal 90kHz oscillator" option provides lowest deep sleep current
              consumption, and does not require extra external components. However
              frequency stability with respect to temperature is poor, so time may
              drift in deep/light sleep modes.
            - "External 32kHz crystal" provides better frequency stability, at the
              expense of slightly higher (1uA) deep sleep current consumption.
            - "External 32kHz oscillator" allows using 32kHz clock generated by an
              external circuit. In this case, external clock signal must be connected
              to 32K_XN pin. Amplitude should be <1.2V in case of sine wave signal,
              and <1V in case of square wave signal. Common mode voltage should be
              0.1 < Vcm < 0.5Vamp, where Vamp is the signal amplitude.
              Additionally, 1nF capacitor must be connected between 32K_XP pin and
              ground. 32K_XP pin can not be used as a GPIO in this case.
            - "Internal 8MHz oscillator divided by 256" option results in higher
              deep sleep current (by 5uA) but has better frequency stability than
              the internal 90kHz oscillator. It does not require external components.

        config ESP32S2_RTC_CLK_SRC_INT_RC
            bool "Internal 90kHz RC oscillator"
        config ESP32S2_RTC_CLK_SRC_EXT_CRYS
            bool "External 32kHz crystal"
            select ESP_SYSTEM_RTC_EXT_XTAL
        config ESP32S2_RTC_CLK_SRC_EXT_OSC
            bool "External 32kHz oscillator at 32K_XN pin"
            select ESP_SYSTEM_RTC_EXT_OSC
        config ESP32S2_RTC_CLK_SRC_INT_8MD256
            bool "Internal 8MHz oscillator, divided by 256 (~32kHz)"
    endchoice

    config ESP32S2_RTC_CLK_CAL_CYCLES
        int "Number of cycles for RTC_SLOW_CLK calibration"
        default 3000 if ESP32S2_RTC_CLK_SRC_EXT_CRYS || ESP32S2_RTC_CLK_SRC_EXT_OSC || ESP32S2_RTC_CLK_SRC_INT_8MD256
        default 576 if ESP32S2_RTC_CLK_SRC_INT_RC
        range 0 125000
        help
            When the startup code initializes RTC_SLOW_CLK, it can perform
            calibration by comparing the RTC_SLOW_CLK frequency with main XTAL
            frequency. This option sets the number of RTC_SLOW_CLK cycles measured
            by the calibration routine. Higher numbers increase calibration
            precision, which may be important for applications which spend a lot of
            time in deep sleep. Lower numbers reduce startup time.

            When this option is set to 0, clock calibration will not be performed at
            startup, and approximate clock frequencies will be assumed:

            - 90000 Hz if internal RC oscillator is used as clock source. For this use value 1024.
            - 32768 Hz if the 32k crystal oscillator is used. For this use value 3000 or more.
              In case more value will help improve the definition of the launch of the crystal.
              If the crystal could not start, it will be switched to internal RC.

    config ESP32S2_RTC_XTAL_CAL_RETRY
        int "Number of attempts to repeat 32k XTAL calibration"
        default 3
        depends on ESP32S2_RTC_CLK_SRC_EXT_CRYS
        help
            Number of attempts to repeat 32k XTAL calibration
            before giving up and switching to the internal RC.
            Increase this option if the 32k crystal oscillator
            does not start and switches to internal RC.

    config ESP32S2_NO_BLOBS
        bool "No Binary Blobs"
        depends on !BT_ENABLED
        default n
        help
            If enabled, this disables the linking of binary libraries in the application build. Note
            that after enabling this Wi-Fi/Bluetooth will not work.

    config ESP32S2_KEEP_USB_ALIVE
        bool "Keep USB peripheral enabled at start up" if !ESP_CONSOLE_USB_CDC
        default y if ESP_CONSOLE_USB_CDC
        help
            During the application initialization process, all the peripherals except UARTs and timers
            are reset. Enable this option to keep USB peripheral enabled.
            This option is automatically enabled if "USB CDC" console is selected.

    config ESP32S2_RTCDATA_IN_FAST_MEM
        bool "Place RTC_DATA_ATTR and RTC_RODATA_ATTR variables into RTC fast memory segment"
        default n
        help
            This option allows to place .rtc_data and .rtc_rodata sections into
            RTC fast memory segment to free the slow memory region for ULP programs.

    config ESP32S2_USE_FIXED_STATIC_RAM_SIZE
        bool "Use fixed static RAM size"
        default n
        help
            If this option is disabled, the DRAM part of the heap starts right after the .bss section,
            within the dram0_0 region. As a result, adding or removing some static variables
            will change the available heap size.

            If this option is enabled, the DRAM part of the heap starts right after the dram0_0 region,
            where its length is set with ESP32S2_FIXED_STATIC_RAM_SIZE

    config ESP32S2_FIXED_STATIC_RAM_SIZE
        hex "Fixed Static RAM size"
        default 0x10000
        range 0 0x34000
        depends on ESP32S2_USE_FIXED_STATIC_RAM_SIZE
        help
            RAM size dedicated for static variables (.data & .bss sections).

endmenu  # ESP32S2-Specific