esp-idf/components/esp32/Kconfig

menu "ESP32-specific config"

choice ESP32_DEFAULT_CPU_FREQ_MHZ
    prompt "CPU frequency"
    default ESP32_DEFAULT_CPU_FREQ_240
    help
        CPU frequency to be set on application startup.

config ESP32_DEFAULT_CPU_FREQ_80
    bool "80 MHz"
config ESP32_DEFAULT_CPU_FREQ_160
    bool "160 MHz"
config ESP32_DEFAULT_CPU_FREQ_240
    bool "240 MHz"
endchoice

config ESP32_DEFAULT_CPU_FREQ_MHZ
    int
    default 80 if ESP32_DEFAULT_CPU_FREQ_80
    default 160 if ESP32_DEFAULT_CPU_FREQ_160
    default 240 if ESP32_DEFAULT_CPU_FREQ_240

choice ESP32_WIFI_OR_BT
    prompt "Select stack to enable (WiFi or BT)"
    default ESP32_ENABLE_WIFI
    help
        Temporarily, WiFi and BT stacks can not be used at the same time.
        Select which stack to enable.

config ESP32_ENABLE_STACK_WIFI
    bool "WiFi"
    select WIFI_ENABLED if ESP32_ENABLE_STACK_WIFI
config ESP32_ENABLE_STACK_BT
    bool "BT"
    select MEMMAP_BT if ESP32_ENABLE_STACK_BT
    select BT_ENABLED if ESP32_ENABLE_STACK_BT
config ESP32_ENABLE_STACK_NONE
    bool "None"
endchoice

config MEMMAP_BT
    bool
    depends on ESP32_ENABLE_STACK_BT
    help
        The Bluetooth stack uses memory that cannot be used as generic memory anymore. This
        reserves the space for that within the memory map of the compiled binary.
        This option is required to enable BT stack.
        Temporarily, this option is not compatible with WiFi stack.

config MEMMAP_SMP
    bool "Reserve memory for two cores"
    default "y"
    help
        The ESP32 contains two cores. If you plan to only use one, you can disable this item
        to save some memory. (ToDo: Make this automatically depend on unicore support)

config MEMMAP_TRACEMEM
    bool "Use TRAX tracing feature"
    default "n"
    help
        The ESP32 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 MEMMAP_TRACEMEM_TWOBANKS
    bool "Reserve memory for tracing both pro as well as app cpu execution"
    default "n"
    depends on MEMMAP_TRACEMEM && MEMMAP_SMP
    help
        The ESP32 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.


# Memory to reverse for trace, used in linker script
config TRACEMEM_RESERVE_DRAM
    hex
    default 0x8000 if MEMMAP_TRACEMEM && MEMMAP_TRACEMEM_TWOBANKS
    default 0x4000 if MEMMAP_TRACEMEM && !MEMMAP_TRACEMEM_TWOBANKS
    default 0x0

# Not implemented and/or needs new silicon rev to work
config MEMMAP_SPISRAM
    bool "Use external SPI SRAM chip as main memory"
    depends on ESP32_NEEDS_NEW_SILICON_REV
    default "n"
    help
        The ESP32 can control an external SPI SRAM chip, adding the memory it contains to the 
        main memory map. Enable this if you have this hardware and want to use it in the same
        way as on-chip RAM.

config WIFI_ENABLED
    bool
    default "y"
    depends on ESP32_ENABLE_STACK_WIFI
    help
        This compiles in the low-level WiFi stack.

        Temporarily, this option is not compatible with BT stack.

config SYSTEM_EVENT_QUEUE_SIZE
    int "System event queue size"
    default 32
    help
        Config system event queue size in different application.

config SYSTEM_EVENT_TASK_STACK_SIZE
    int "Event loop task stack size"
    default 2048
    help
        Config system event task stack size in different application.


config MAIN_TASK_STACK_SIZE
    int "Main task stack size"
    default 4096
    help
        Config system event task stack size in different application.


config NEWLIB_STDOUT_ADDCR
    bool "Standard-out output adds carriage return before newline"
    default y
    help
        Most people are used to end their printf strings with a newline. If this
        is sent as is to the serial port, most terminal programs will only move the
        cursor one line down, not also move it to the beginning of the line. This
        is usually done by an added CR character. Enabling this will make the
        standard output code automatically add a CR character before a LF.

config ULP_COPROC_ENABLED
    bool "Enable Ultra Low Power (ULP) Coprocessor"
    default "n"
    help
        Set to 'y' if you plan to load a firmware for the coprocessor.

        If this option is enabled, further coprocessor configuration will appear in the Components menu.

config ULP_COPROC_RESERVE_MEM
    int "RTC slow memory reserved for coprocessor"
    default 512
    range 32 8192
    depends on ULP_COPROC_ENABLED
    help
        Bytes of memory to reserve for ULP coprocessor firmware & data.

        Data is reserved at the beginning of RTC slow memory.

# Set CONFIG_ULP_COPROC_RESERVE_MEM to 0 if ULP is disabled
config ULP_COPROC_RESERVE_MEM
    int
    default 0
    depends on !ULP_COPROC_ENABLED


choice ESP32_PANIC
    prompt "Panic handler behaviour"
    default ESP32_PANIC_PRINT_REBOOT
    help
        If FreeRTOS detects unexpected behaviour or an unhandled exception, the panic handler is 
        invoked. Configure the panic handlers action here.

config ESP32_PANIC_PRINT_HALT
    bool "Print registers and halt"
    help
        Outputs the relevant registers over the serial port and halt the 
        processor. Needs a manual reset to restart.

config ESP32_PANIC_PRINT_REBOOT
    bool "Print registers and reboot"
    help
        Outputs the relevant registers over the serial port and immediately
        reset the processor.

config ESP32_PANIC_SILENT_REBOOT
    bool "Silent reboot"
    help
        Just resets the processor without outputting anything

config ESP32_PANIC_GDBSTUB
    bool "Invoke GDBStub"
    help
        Invoke gdbstub on the serial port, allowing for gdb to attach to it to do a postmortem
        of the crash.
endchoice

config ESP32_DEBUG_OCDAWARE
    bool "Make exception and panic handlers JTAG/OCD aware"
    default y
    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 INT_WDT
    bool "Interrupt watchdog"
    default y
    help
        This watchdog timer can detect if the FreeRTOS tick interrupt has not been called for a certain time,
        either because a task turned off interrupts and did not turn them on for a long time, or because an
        interrupt handler did not return. It will try to invoke the panic handler first and failing that
        reset the SoC.

config INT_WDT_TIMEOUT_MS
    int "Interrupt watchdog timeout (ms)"
    depends on INT_WDT
    default 300
    range 10 10000
    help
        The timeout of the watchdog, in miliseconds. Make this higher than the FreeRTOS tick rate.

config INT_WDT_CHECK_CPU1
    bool "Also watch CPU1 tick interrupt"
    depends on INT_WDT && !FREERTOS_UNICORE
    default y
    help
        Also detect if interrupts on CPU 1 are disabled for too long.

config TASK_WDT
    bool "Task watchdog"
    default y
    help
        This watchdog timer can be used to make sure individual tasks are still running.

config TASK_WDT_PANIC
    bool "Invoke panic handler when Task Watchdog is triggered"
    depends on TASK_WDT
    default n
    help
        Normally, the Task Watchdog will only print out a warning if it detects it has not
        been fed. If this is enabled, it will invoke the panic handler instead, which
        can then halt or reboot the chip.

config TASK_WDT_TIMEOUT_S
    int "Task watchdog timeout (seconds)"
    depends on TASK_WDT
    range 1 60
    default 5
    help
        Timeout for the task WDT, in seconds.

config TASK_WDT_CHECK_IDLE_TASK
    bool "Task watchdog watches CPU0 idle task"
    depends on TASK_WDT
    default y
    help
        With this turned on, the task WDT can detect if the idle task is not called within the task
        watchdog timeout period. The idle task not being called usually is a symptom of another
        task hoarding the CPU. It is also a bad thing because FreeRTOS household tasks depend on the 
        idle task getting some runtime every now and then. Take Care: With this disabled, this 
        watchdog will trigger if no tasks register themselves within the timeout value.

config TASK_WDT_CHECK_IDLE_TASK_CPU1
    bool "Task watchdog also watches CPU1 idle task"
    depends on TASK_WDT_CHECK_IDLE_TASK && !FREERTOS_UNICORE
    default y
    help
        Also check the idle task that runs on CPU1.

#The brownout detector code is disabled (by making it depend on a nonexisting symbol) because the current revision of ESP32
#silicon has a bug in the brown-out detector, rendering it unusable for resetting the CPU.
config BROWNOUT_DET
    bool "Hardware brownout detect & reset"
    default y
    depends on NEEDS_ESP32_NEW_SILICON_REV
    help
        The ESP32 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 BROWNOUT_DET_LVL_SEL
    prompt "Brownout voltage level"
    depends on BROWNOUT_DET
    default BROWNOUT_DET_LVL_SEL_25
    help
        The brownout detector will reset the chip when the supply voltage is below this level.

#The voltage levels here are estimates, more work needs to be done to figure out the exact voltages
#of the brownout threshold levels.
config BROWNOUT_DET_LVL_SEL_0
    bool "2.1V"
config BROWNOUT_DET_LVL_SEL_1
    bool "2.2V"
config BROWNOUT_DET_LVL_SEL_2
    bool "2.3V"
config BROWNOUT_DET_LVL_SEL_3
    bool "2.4V"
config BROWNOUT_DET_LVL_SEL_4
    bool "2.5V"
config BROWNOUT_DET_LVL_SEL_5
    bool "2.6V"
config BROWNOUT_DET_LVL_SEL_6
    bool "2.7V"
config BROWNOUT_DET_LVL_SEL_7
    bool "2.8V"
endchoice

config BROWNOUT_DET_LVL
    int
    default 0 if BROWNOUT_DET_LVL_SEL_0
    default 1 if BROWNOUT_DET_LVL_SEL_1
    default 2 if BROWNOUT_DET_LVL_SEL_2
    default 3 if BROWNOUT_DET_LVL_SEL_3
    default 4 if BROWNOUT_DET_LVL_SEL_4
    default 5 if BROWNOUT_DET_LVL_SEL_5
    default 6 if BROWNOUT_DET_LVL_SEL_6
    default 7 if BROWNOUT_DET_LVL_SEL_7


config BROWNOUT_DET_RESETDELAY
    int "Brownout reset delay (in uS)"
    depends on BROWNOUT_DET
    range 0 6820
    default 1000
    help
        The brownout detector can reset the chip after a certain delay, in order to make sure e.g. a voltage dip has entirely passed
        before trying to restart the chip. You can set the delay here.


choice ESP32_TIME_SYSCALL
	prompt "Timers used for gettimeofday function"
	default ESP32_TIME_SYSCALL_USE_RTC_FRC1
	help
		This setting defines which hardware timers are used to
		implement 'gettimeofday' and 'time' functions in C library.
		
		- If only FRC1 timer is used, gettimeofday will provide time at
		  microsecond resolution. Time will not be preserved when going
		  into deep sleep mode.
		- If both FRC1 and RTC timers are used, timekeeping will
		  continue in deep sleep. Time will be reported at 1 microsecond
		  resolution.
		- 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. 
		  
config ESP32_TIME_SYSCALL_USE_RTC
    bool "RTC"
config ESP32_TIME_SYSCALL_USE_RTC_FRC1
    bool "RTC and FRC1"
config ESP32_TIME_SYSCALL_USE_FRC1
    bool "FRC1"
config ESP32_TIME_SYSCALL_USE_NONE
    bool "None"
endchoice

choice ESP32_RTC_CLOCK_SOURCE
	prompt "RTC clock source"
	default ESP32_RTC_CLOCK_SOURCE_INTERNAL_RC
	help
		Choose which clock is used as RTC clock source.
		The only available option for now is to use internal
		150kHz RC oscillator.

config ESP32_RTC_CLOCK_SOURCE_INTERNAL_RC
	bool "Internal RC"
config ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL
	bool "External 32kHz crystal"
	depends on DOCUMENTATION_FOR_RTC_CNTL
endchoice

endmenu