menu "ESP32-specific" choice ESP32_DEFAULT_CPU_FREQ_MHZ prompt "CPU frequency" default ESP32_DEFAULT_CPU_FREQ_160 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 config SPIRAM_SUPPORT bool "Support for external, SPI-connected RAM" default "n" 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 SPIRAM_SUPPORT config SPIRAM_BOOT_INIT bool "Initialize SPI RAM when booting the ESP32" default "y" help If this is enabled, the SPI RAM will be enabled during initial boot. Unless you have specific requirements, you'll want to leave this enabled so memory allocated during boot-up can also be placed in SPI RAM. config SPIRAM_IGNORE_NOTFOUND bool "Ignore PSRAM when not found" default "n" depends on SPIRAM_BOOT_INIT help Normally, if psram initialization is enabled during compile time but not found at runtime, it is seen as an error making the ESP32 panic. If this is enabled, the ESP32 will keep on running but will not add the (non-existing) RAM to any allocator. choice SPIRAM_USE prompt "SPI RAM access method" default SPIRAM_USE_MALLOC help The SPI RAM can be accessed in multiple methods: by just having it available as an unmanaged memory region in the ESP32 memory map, by integrating it in the ESP32s heap as 'special' memory needing heap_caps_malloc to allocate, or by fully integrating it making malloc() also able to return SPI RAM pointers. config SPIRAM_USE_MEMMAP bool "Integrate RAM into ESP32 memory map" config SPIRAM_USE_CAPS_ALLOC bool "Make RAM allocatable using heap_caps_malloc(..., MALLOC_CAP_SPIRAM)" config SPIRAM_USE_MALLOC bool "Make RAM allocatable using malloc() as well" select SUPPORT_STATIC_ALLOCATION endchoice choice SPIRAM_TYPE prompt "Type of SPI RAM chip in use" default SPIRAM_TYPE_ESPPSRAM32 config SPIRAM_TYPE_ESPPSRAM32 bool "ESP-PSRAM32 or IS25WP032" endchoice config SPIRAM_SIZE int default 4194304 if SPIRAM_TYPE_ESPPSRAM32 default 0 choice SPIRAM_SPEED prompt "Set RAM clock speed" default SPIRAM_CACHE_SPEED_40M help Select the speed for the SPI RAM chip. If SPI RAM is enabled, we only support three combinations of SPI speed mode we supported now: 1. Flash SPI running at 40Mhz and RAM SPI running at 40Mhz 2. Flash SPI running at 80Mhz and RAM SPI running at 40Mhz 3. Flash SPI running at 80Mhz and RAM SPI running at 80Mhz Note: If the third mode(80Mhz+80Mhz) is enabled, the VSPI port will be occupied by the system. Application code should never touch VSPI hardware in this case. The option to select 80MHz will only be visible if the flash SPI speed is also 80MHz. (ESPTOOLPY_FLASHFREQ_80M is true) config SPIRAM_SPEED_40M bool "40MHz clock speed" config SPIRAM_SPEED_80M depends on ESPTOOLPY_FLASHFREQ_80M bool "80MHz clock speed" endchoice config SPIRAM_MEMTEST bool "Run memory test on SPI RAM initialization" default "y" depends on SPIRAM_BOOT_INIT help Runs a rudimentary memory test on initialization. Aborts when memory test fails. Disable this for slightly faster startop. config SPIRAM_CACHE_WORKAROUND bool "Enable workaround for bug in SPI RAM cache for Rev1 ESP32s" depends on SPIRAM_USE_MEMMAP || SPIRAM_USE_CAPS_ALLOC || SPIRAM_USE_MALLOC default "y" help Revision 1 of the ESP32 has a bug that can cause a write to PSRAM not to take place in some situations when the cache line needs to be fetched from external RAM and an interrupt occurs. This enables a fix in the compiler that makes sure the specific code that is vulnerable to this will not be emitted. This will also not use any bits of newlib that are located in ROM, opting for a version that is compiled with the workaround and located in flash instead. config SPIRAM_MALLOC_ALWAYSINTERNAL int "Maximum malloc() size, in bytes, to always put in internal memory" depends on SPIRAM_USE_MALLOC default 16384 range 0 131072 help If malloc() is capable of also allocating SPI-connected ram, its allocation strategy will prefer to allocate chunks less than this size in internal memory, while allocations larger than this will be done from external RAM. If allocation from the preferred region fails, an attempt is made to allocate from the non-preferred region instead, so malloc() will not suddenly fail when either internal or external memory is full. config WIFI_LWIP_ALLOCATION_FROM_SPIRAM_FIRST bool "Try to allocate memories of WiFi and LWIP in SPIRAM firstly. If failed, allocate internal memory" depends on SPIRAM_USE_CAPS_ALLOC || SPIRAM_USE_MALLOC default "n" help Try to allocate memories of WiFi and LWIP in SPIRAM firstly. If failed, try to allocate internal memory then. config SPIRAM_MALLOC_RESERVE_INTERNAL int "Reserve this amount of bytes for data that specifically needs to be in DMA or internal memory" depends on SPIRAM_USE_MALLOC default 32768 range 0 262144 help Because the external/internal RAM allocation strategy is not always perfect, it sometimes may happen that the internal memory is entirely filled up. This causes allocations that are specifically done in internal memory, for example the stack for new tasks or memory to service DMA or have memory that's also available when SPI cache is down, to fail. This option reserves a pool specifically for requests like that; the memory in this pool is not given out when a normal malloc() is called. Set this to 0 to disable this feature. Note that because FreeRTOS stacks are forced to internal memory, they will also use this memory pool; be sure to keep this in mind when adjusting this value. Note also that the DMA reserved pool may not be one single contiguous memory region, depending on the configured size and the static memory usage of the app. config SPIRAM_ALLOW_STACK_EXTERNAL_MEMORY bool "Allow external memory as an argument to xTaskCreateStatic" default n depends on SPIRAM_USE_MALLOC help Because some bits of the ESP32 code environment cannot be recompiled with the cache workaround, normally tasks cannot be safely run with their stack residing in external memory; for this reason xTaskCreate and friends always allocate stack in internal memory and xTaskCreateStatic will check if the memory passed to it is in internal memory. If you have a task that needs a large amount of stack and does not call on ROM code in any way (no direct calls, but also no Bluetooth/WiFi), you can try to disable this and use xTaskCreateStatic to create the tasks stack in external memory. endmenu config MEMMAP_TRACEMEM bool default "n" config MEMMAP_TRACEMEM_TWOBANKS bool default "n" config ESP32_TRAX bool "Use TRAX tracing feature" default "n" select MEMMAP_TRACEMEM 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 ESP32_TRAX_TWOBANKS bool "Reserve memory for tracing both pro as well as app cpu execution" default "n" depends on ESP32_TRAX && !FREERTOS_UNICORE select MEMMAP_TRACEMEM_TWOBANKS 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 choice ESP32_COREDUMP_TO_FLASH_OR_UART prompt "Core dump destination" default ESP32_ENABLE_COREDUMP_TO_NONE help Select place to store core dump: flash, uart or none (to disable core dumps generation). If core dump is configured to be stored in flash and custom partition table is used add corresponding entry to your CSV. For examples, please see predefined partition table CSV descriptions in the components/partition_table directory. config ESP32_ENABLE_COREDUMP_TO_FLASH bool "Flash" select ESP32_ENABLE_COREDUMP config ESP32_ENABLE_COREDUMP_TO_UART bool "UART" select ESP32_ENABLE_COREDUMP config ESP32_ENABLE_COREDUMP_TO_NONE bool "None" endchoice config ESP32_ENABLE_COREDUMP bool default F help Enables/disable core dump module. config ESP32_CORE_DUMP_UART_DELAY int "Core dump print to UART delay" depends on ESP32_ENABLE_COREDUMP_TO_UART default 0 help Config delay (in ms) before printing core dump to UART. Delay can be interrupted by pressing Enter key. config ESP32_CORE_DUMP_LOG_LEVEL int "Core dump module logging level" depends on ESP32_ENABLE_COREDUMP default 1 help Config core dump module logging level (0-5). choice NUMBER_OF_UNIVERSAL_MAC_ADDRESS bool "Number of universally administered (by IEEE) MAC address" default FOUR_UNIVERSAL_MAC_ADDRESS help Configure the number of universally administered (by IEEE) MAC addresses. During initialisation, MAC addresses for each network interface are generated or derived from a single base MAC address. If the number of universal MAC addresses is four, all four interfaces (WiFi station, WiFi softap, Bluetooth and Ethernet) receive a universally administered MAC address. These are generated sequentially by adding 0, 1, 2 and 3 (respectively) to the final octet of the base MAC address. If the number of universal MAC addresses is two, only two interfaces (WiFi station and Bluetooth) receive a universally administered MAC address. These are generated sequentially by adding 0 and 1 (respectively) to the base MAC address. The remaining two interfaces (WiFi softap and Ethernet) receive local MAC addresses. These are derived from the universal WiFi station and Bluetooth MAC addresses, respectively. When using the default (Espressif-assigned) base MAC address, either setting can be used. When using a custom universal MAC address range, the correct setting will depend on the allocation of MAC addresses in this range (either 2 or 4 per device.) config TWO_UNIVERSAL_MAC_ADDRESS bool "Two" config FOUR_UNIVERSAL_MAC_ADDRESS bool "Four" endchoice config NUMBER_OF_UNIVERSAL_MAC_ADDRESS int default 2 if TWO_UNIVERSAL_MAC_ADDRESS default 4 if FOUR_UNIVERSAL_MAC_ADDRESS 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 2304 help Config system event task stack size in different application. config MAIN_TASK_STACK_SIZE int "Main task stack size" default 3584 help Configure the "main task" stack size. This is the stack of the task which calls app_main(). If app_main() returns then this task is deleted and its stack memory is freed. config IPC_TASK_STACK_SIZE int "Inter-Processor Call (IPC) task stack size" default 1024 range 512 65536 if !ESP32_APPTRACE_ENABLE range 2048 65536 if ESP32_APPTRACE_ENABLE help Configure the IPC tasks stack size. One IPC task runs on each core (in dual core mode), and allows for cross-core function calls. See IPC documentation for more details. The default stack size should be enough for most common use cases. It can be shrunk if you are sure that you do not use any custom IPC functionality. config TIMER_TASK_STACK_SIZE int "High-resolution timer task stack size" default 3584 range 2048 65536 help Configure the stack size of esp_timer/ets_timer task. This task is used to dispatch callbacks of timers created using ets_timer and esp_timer APIs. If you are seing stack overflow errors in timer task, increase this value. Note that this is not the same as FreeRTOS timer task. To configure FreeRTOS timer task size, see "FreeRTOS timer task stack size" option in "FreeRTOS" menu. choice NEWLIB_STDOUT_LINE_ENDING prompt "Line ending for UART output" default NEWLIB_STDOUT_LINE_ENDING_CRLF help This option allows configuring the desired line endings sent to UART when a newline ('\n', LF) appears on stdout. Three options are possible: CRLF: whenever LF is encountered, prepend it with CR LF: no modification is applied, stdout is sent as is CR: each occurence of LF is replaced with CR This option doesn't affect behavior of the UART driver (drivers/uart.h). config NEWLIB_STDOUT_LINE_ENDING_CRLF bool "CRLF" config NEWLIB_STDOUT_LINE_ENDING_LF bool "LF" config NEWLIB_STDOUT_LINE_ENDING_CR bool "CR" endchoice choice NEWLIB_STDIN_LINE_ENDING prompt "Line ending for UART input" default NEWLIB_STDIN_LINE_ENDING_CR help This option allows configuring which input sequence on UART produces a newline ('\n', LF) on stdin. Three options are possible: CRLF: CRLF is converted to LF LF: no modification is applied, input is sent to stdin as is CR: each occurence of CR is replaced with LF This option doesn't affect behavior of the UART driver (drivers/uart.h). config NEWLIB_STDIN_LINE_ENDING_CRLF bool "CRLF" config NEWLIB_STDIN_LINE_ENDING_LF bool "LF" config NEWLIB_STDIN_LINE_ENDING_CR bool "CR" endchoice config NEWLIB_NANO_FORMAT bool "Enable 'nano' formatting options for printf/scanf family" default n help ESP32 ROM contains parts of newlib C library, including printf/scanf family of functions. These functions have been compiled with so-called "nano" formatting option. This option doesn't support 64-bit integer formats and C99 features, such as positional arguments. For more details about "nano" formatting option, please see newlib readme file, search for '--enable-newlib-nano-formatted-io': https://sourceware.org/newlib/README If this option is enabled, build system will use functions available in ROM, reducing the application binary size. Functions available in ROM run faster than functions which run from flash. Functions available in ROM can also run when flash instruction cache is disabled. If you need 64-bit integer formatting support or C99 features, keep this option disabled. choice CONSOLE_UART prompt "UART for console output" default CONSOLE_UART_DEFAULT help Select whether to use UART for console output (through stdout and stderr). - Default is to use UART0 on pins GPIO1(TX) and GPIO3(RX). - If "Custom" is selected, UART0 or UART1 can be chosen, and any pins can be selected. - If "None" is selected, there will be no console output on any UART, except for initial output from ROM bootloader. This output can be further suppressed by bootstrapping GPIO13 pin to low logic level. config CONSOLE_UART_DEFAULT bool "Default: UART0, TX=GPIO1, RX=GPIO3" config CONSOLE_UART_CUSTOM bool "Custom" config CONSOLE_UART_NONE bool "None" endchoice choice CONSOLE_UART_NUM prompt "UART peripheral to use for console output (0-1)" depends on CONSOLE_UART_CUSTOM default CONSOLE_UART_CUSTOM_NUM_0 help Due of a ROM bug, UART2 is not supported for console output via ets_printf. config CONSOLE_UART_CUSTOM_NUM_0 bool "UART0" config CONSOLE_UART_CUSTOM_NUM_1 bool "UART1" endchoice config CONSOLE_UART_NUM int default 0 if CONSOLE_UART_DEFAULT || CONSOLE_UART_NONE default 0 if CONSOLE_UART_CUSTOM_NUM_0 default 1 if CONSOLE_UART_CUSTOM_NUM_1 config CONSOLE_UART_TX_GPIO int "UART TX on GPIO#" depends on CONSOLE_UART_CUSTOM range 0 33 default 19 config CONSOLE_UART_RX_GPIO int "UART RX on GPIO#" depends on CONSOLE_UART_CUSTOM range 0 39 default 21 config CONSOLE_UART_BAUDRATE int "UART console baud rate" depends on !CONSOLE_UART_NONE default 115200 range 1200 4000000 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 prompt "RTC slow memory reserved for coprocessor" if ULP_COPROC_ENABLED default 512 if ULP_COPROC_ENABLED range 32 8192 if ULP_COPROC_ENABLED default 0 if !ULP_COPROC_ENABLED range 0 0 if !ULP_COPROC_ENABLED help Bytes of memory to reserve for ULP coprocessor firmware & data. Data is reserved at the beginning of RTC slow memory. 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 ESP32_DEBUG_STUBS_ENABLE bool "OpenOCD debug stubs" default OPTIMIZATION_LEVEL_DEBUG depends on !ESP32_TRAX help Debug stubs are used by OpenOCD to execute pre-compiled onboard code which does some useful debugging, e.g. GCOV data dump. 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 if !SPIRAM_SUPPORT default 800 if SPIRAM_SUPPORT 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 "Initialize Task Watchdog Timer on startup" default y help The Task Watchdog Timer can be used to make sure individual tasks are still running. Enabling this option will cause the Task Watchdog Timer to be initialized automatically at startup. The Task Watchdog timer can be initialized after startup as well (see Task Watchdog Timer API Reference) config TASK_WDT_PANIC bool "Invoke panic handler on Task Watchdog timeout" depends on TASK_WDT default n help If this option is enabled, the Task Watchdog Timer will be configured to trigger the panic handler when it times out. This can also be configured at run time (see Task Watchdog Timer API Reference) config TASK_WDT_TIMEOUT_S int "Task Watchdog timeout period (seconds)" depends on TASK_WDT range 1 60 default 5 help Timeout period configuration for the Task Watchdog Timer in seconds. This is also configurable at run time (see Task Watchdog Timer API Reference) config TASK_WDT_CHECK_IDLE_TASK_CPU0 bool "Watch CPU0 Idle Task" depends on TASK_WDT default y help If this option is enabled, the Task Watchdog Timer will watch the CPU0 Idle Task. Having the Task Watchdog watch the Idle Task allows for detection of CPU starvation as the Idle Task not being called is usually a symptom of CPU starvation. Starvation of the Idle Task is detrimental as FreeRTOS household tasks depend on the Idle Task getting some runtime every now and then. config TASK_WDT_CHECK_IDLE_TASK_CPU1 bool "Watch CPU1 Idle Task" depends on TASK_WDT && !FREERTOS_UNICORE default y help If this option is enabled, the Task Wtachdog Timer will wach the CPU1 Idle Task. #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 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 approximately below this level. Note that there may be some variation of brownout voltage level between each ESP32 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 BROWNOUT_DET_LVL_SEL_0 bool "2.43V +/- 0.05" config BROWNOUT_DET_LVL_SEL_1 bool "2.48V +/- 0.05" config BROWNOUT_DET_LVL_SEL_2 bool "2.58V +/- 0.05" config BROWNOUT_DET_LVL_SEL_3 bool "2.62V +/- 0.05" config BROWNOUT_DET_LVL_SEL_4 bool "2.67V +/- 0.05" config BROWNOUT_DET_LVL_SEL_5 bool "2.70V +/- 0.05" config BROWNOUT_DET_LVL_SEL_6 bool "2.77V +/- 0.05" config BROWNOUT_DET_LVL_SEL_7 bool "2.80V +/- 0.05" 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 #Reduce PHY TX power when brownout reset config REDUCE_PHY_TX_POWER bool "Reduce PHY TX power when brownout reset" depends on BROWNOUT_DET default y help When brownout reset occurs, reduce PHY TX power to keep the code running # Note about the use of "FRC1" name: currently FRC1 timer is not used for # high resolution timekeeping anymore. Instead the esp_timer API, implemented # using FRC2 timer, is used. # FRC1 name in the option name is kept for compatibility. 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 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 ESP32_TIME_SYSCALL_USE_RTC_FRC1 bool "RTC and high-resolution timer" config ESP32_TIME_SYSCALL_USE_RTC bool "RTC" config ESP32_TIME_SYSCALL_USE_FRC1 bool "High-resolution timer" 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. - "Internal 150kHz 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_XP 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_XN pin and ground. 32K_XN pin can not be used as a GPIO in this case. - "Internal 8.5MHz oscillator divided by 256" option results in higher deep sleep current (by 5uA) but has better frequency stability than the internal 150kHz oscillator. It does not require external components. config ESP32_RTC_CLOCK_SOURCE_INTERNAL_RC bool "Internal 150kHz RC oscillator" config ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL bool "External 32kHz crystal" config ESP32_RTC_CLOCK_SOURCE_EXTERNAL_OSC bool "External 32kHz oscillator at 32K_XP pin" config ESP32_RTC_CLOCK_SOURCE_INTERNAL_8MD256 bool "Internal 8.5MHz oscillator, divided by 256 (~33kHz)" endchoice config ESP32_RTC_CLK_CAL_CYCLES int "Number of cycles for RTC_SLOW_CLK calibration" default 3000 if ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL default 1024 if ESP32_RTC_CLOCK_SOURCE_INTERNAL_RC range 0 27000 if ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL || ESP32_RTC_CLOCK_SOURCE_EXTERNAL_OSC || ESP32_RTC_CLOCK_SOURCE_INTERNAL_8MD256 range 0 32766 if ESP32_RTC_CLOCK_SOURCE_INTERNAL_RC 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: - 150000 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 ESP32_RTC_XTAL_BOOTSTRAP_CYCLES int "Bootstrap cycles for external 32kHz crystal" depends on ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL default 5 range 0 32768 help To reduce the startup time of an external RTC crystal, we bootstrap it with a 32kHz square wave for a fixed number of cycles. Setting 0 will disable bootstrapping (if disabled, the crystal may take longer to start up or fail to oscillate under some conditions). If this value is too high, a faulty crystal may initially start and then fail. If this value is too low, an otherwise good crystal may not start. To accurately determine if the crystal has started, set a larger "Number of cycles for RTC_SLOW_CLK calibration" (about 3000). config ESP32_DEEP_SLEEP_WAKEUP_DELAY int "Extra delay in deep sleep wake stub (in us)" default 2000 range 0 5000 help When ESP32 exits deep sleep, the CPU and the flash chip are powered on at the same time. CPU will run deep sleep stub first, and then proceed to load code from flash. Some flash chips need sufficient time to pass between power on and first read operation. By default, without any extra delay, this time is approximately 900us, although some flash chip types need more than that. By default extra delay is set to 2000us. When optimizing startup time for applications which require it, this value may be reduced. If you are seeing "flash read err, 1000" message printed to the console after deep sleep reset, try increasing this value. choice ESP32_XTAL_FREQ_SEL prompt "Main XTAL frequency" default ESP32_XTAL_FREQ_40 help ESP32 currently supports the following XTAL frequencies: - 26 MHz - 40 MHz Startup code can automatically estimate XTAL frequency. This feature uses the internal 8MHz oscillator as a reference. Because the internal oscillator frequency is temperature dependent, it is not recommended to use automatic XTAL frequency detection in applications which need to work at high ambient temperatures and use high-temperature qualified chips and modules. config ESP32_XTAL_FREQ_40 bool "40 MHz" config ESP32_XTAL_FREQ_26 bool "26 MHz" config ESP32_XTAL_FREQ_AUTO bool "Autodetect" endchoice # Keep these values in sync with rtc_xtal_freq_t enum in soc/rtc.h config ESP32_XTAL_FREQ int default 0 if ESP32_XTAL_FREQ_AUTO default 40 if ESP32_XTAL_FREQ_40 default 26 if ESP32_XTAL_FREQ_26 config DISABLE_BASIC_ROM_CONSOLE bool "Permanently disable BASIC ROM Console" default n help If set, the first time the app boots it will disable the BASIC ROM Console permanently (by burning an efuse). Otherwise, the BASIC ROM Console starts on reset if no valid bootloader is read from the flash. (Enabling secure boot also disables the BASIC ROM Console by default.) config 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 ESP_TIMER_PROFILING bool "Enable esp_timer profiling features" default n help If enabled, esp_timer_dump will dump information such as number of times the timer was started, number of times the timer has triggered, and the total time it took for the callback to run. This option has some effect on timer performance and the amount of memory used for timer storage, and should only be used for debugging/testing purposes. config COMPATIBLE_PRE_V2_1_BOOTLOADERS bool "App compatible with bootloaders before IDF v2.1" default n help Bootloaders before IDF v2.1 did less initialisation of the system clock. This setting needs to be enabled to build an app which can be booted by these older bootloaders. If this setting is enabled, the app can be booted by any bootloader from IDF v1.0 up to the current version. If this setting is disabled, the app can only be booted by bootloaders from IDF v2.1 or newer. Enabling this setting adds approximately 1KB to the app's IRAM usage. config ESP_ERR_TO_NAME_LOOKUP bool "Enable lookup of error code strings" default "y" help Functions esp_err_to_name() and esp_err_to_name_r() return string representations of error codes from a pre-generated lookup table. This option can be used to turn off the use of the look-up table in order to save memory but this comes at the price of sacrificing distinguishable (meaningful) output string representations. config ESP32_RTCDATA_IN_FAST_MEM bool "Place RTC_DATA_ATTR and RTC_RODATA_ATTR variables into RTC fast memory segment" default n depends on FREERTOS_UNICORE 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. This option depends on the CONFIG_FREERTOS_UNICORE option because RTC fast memory can be accessed only by PRO_CPU core. endmenu # ESP32-Specific menu Wi-Fi config SW_COEXIST_ENABLE bool "Software controls WiFi/Bluetooth coexistence" depends on BT_ENABLED default y help If enabled, WiFi & Bluetooth coexistence is controlled by software rather than hardware. Recommended for heavy traffic scenarios. Both coexistence configuration options are automatically managed, no user intervention is required. choice SW_COEXIST_PREFERENCE prompt "WiFi/Bluetooth coexistence performance preference" depends on SW_COEXIST_ENABLE default SW_COEXIST_PREFERENCE_BALANCE help Choose Bluetooth/WiFi/Balance for different preference. If choose WiFi, it will make WiFi performance better. Such, keep WiFi Audio more fluent. If choose Bluetooth, it will make Bluetooth performance better. Such, keep Bluetooth(A2DP) Audio more fluent. If choose Balance, the performance of WiFi and bluetooth will be balance. It's default. Normally, just choose balance, the A2DP audio can play fluently, too. Except config preference in menuconfig, you can also call esp_coex_preference_set() dynamically. config SW_COEXIST_PREFERENCE_WIFI bool "WiFi" config SW_COEXIST_PREFERENCE_BT bool "Bluetooth(include BR/EDR and BLE)" config SW_COEXIST_PREFERENCE_BALANCE bool "Balance" endchoice config SW_COEXIST_PREFERENCE_VALUE int depends on SW_COEXIST_ENABLE default 0 if SW_COEXIST_PREFERENCE_WIFI default 1 if SW_COEXIST_PREFERENCE_BT default 2 if SW_COEXIST_PREFERENCE_BALANCE config ESP32_WIFI_STATIC_RX_BUFFER_NUM int "Max number of WiFi static RX buffers" range 2 25 default 10 help Set the number of WiFi static RX buffers. Each buffer takes approximately 1.6KB of RAM. The static rx buffers are allocated when esp_wifi_init is called, they are not freed until esp_wifi_deinit is called. WiFi hardware use these buffers to receive all 802.11 frames. A higher number may allow higher throughput but increases memory use. config ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM int "Max number of WiFi dynamic RX buffers" range 0 128 default 32 help Set the number of WiFi dynamic RX buffers, 0 means unlimited RX buffers will be allocated (provided sufficient free RAM). The size of each dynamic RX buffer depends on the size of the received data frame. For each received data frame, the WiFi driver makes a copy to an RX buffer and then delivers it to the high layer TCP/IP stack. The dynamic RX buffer is freed after the higher layer has successfully received the data frame. For some applications, WiFi data frames may be received faster than the application can process them. In these cases we may run out of memory if RX buffer number is unlimited (0). If a dynamic RX buffer limit is set, it should be at least the number of static RX buffers. choice ESP32_WIFI_TX_BUFFER prompt "Type of WiFi TX buffers" default ESP32_WIFI_DYNAMIC_TX_BUFFER help Select type of WiFi TX buffers: If "Static" is selected, WiFi TX buffers are allocated when WiFi is initialized and released when WiFi is de-initialized. The size of each static TX buffer is fixed to about 1.6KB. If "Dynamic" is selected, each WiFi TX buffer is allocated as needed when a data frame is delivered to the Wifi driver from the TCP/IP stack. The buffer is freed after the data frame has been sent by the WiFi driver. The size of each dynamic TX buffer depends on the length of each data frame sent by the TCP/IP layer. If PSRAM is enabled, "Static" should be selected to guarantee enough WiFi TX buffers. If PSRAM is disabled, "Dynamic" should be selected to improve the utilization of RAM. config ESP32_WIFI_STATIC_TX_BUFFER bool "Static" config ESP32_WIFI_DYNAMIC_TX_BUFFER bool "Dynamic" depends on !SPIRAM_USE_MALLOC endchoice config ESP32_WIFI_TX_BUFFER_TYPE int default 0 if ESP32_WIFI_STATIC_TX_BUFFER default 1 if ESP32_WIFI_DYNAMIC_TX_BUFFER config ESP32_WIFI_STATIC_TX_BUFFER_NUM int "Max number of WiFi static TX buffers" depends on ESP32_WIFI_STATIC_TX_BUFFER range 6 64 default 16 help Set the number of WiFi static TX buffers. Each buffer takes approximately 1.6KB of RAM. The static RX buffers are allocated when esp_wifi_init() is called, they are not released until esp_wifi_deinit() is called. For each transmitted data frame from the higher layer TCP/IP stack, the WiFi driver makes a copy of it in a TX buffer. For some applications especially UDP applications, the upper layer can deliver frames faster than WiFi layer can transmit. In these cases, we may run out of TX buffers. config ESP32_WIFI_DYNAMIC_TX_BUFFER_NUM int "Max number of WiFi dynamic TX buffers" depends on ESP32_WIFI_DYNAMIC_TX_BUFFER range 16 128 default 32 help Set the number of WiFi dynamic TX buffers. The size of each dynamic TX buffer is not fixed, it depends on the size of each transmitted data frame. For each transmitted frame from the higher layer TCP/IP stack, the WiFi driver makes a copy of it in a TX buffer. For some applications, especially UDP applications, the upper layer can deliver frames faster than WiFi layer can transmit. In these cases, we may run out of TX buffers. config ESP32_WIFI_CSI_ENABLED bool "WiFi CSI(Channel State Information)" default n help Select this option to enable CSI(Channel State Information) feature. CSI takes about CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM KB of RAM. If CSI is not used, it is better to disable this feature in order to save memory. config ESP32_WIFI_AMPDU_TX_ENABLED bool "WiFi AMPDU TX" default y help Select this option to enable AMPDU TX feature config ESP32_WIFI_TX_BA_WIN int "WiFi AMPDU TX BA window size" depends on ESP32_WIFI_AMPDU_TX_ENABLED range 2 32 default 6 help Set the size of WiFi Block Ack TX window. Generally a bigger value means higher throughput but more memory. Most of time we should NOT change the default value unless special reason, e.g. test the maximum UDP TX throughput with iperf etc. For iperf test in shieldbox, the recommended value is 9~12. config ESP32_WIFI_AMPDU_RX_ENABLED bool "WiFi AMPDU RX" default y help Select this option to enable AMPDU RX feature config ESP32_WIFI_RX_BA_WIN int "WiFi AMPDU RX BA window size" depends on ESP32_WIFI_AMPDU_RX_ENABLED range 2 32 default 6 help Set the size of WiFi Block Ack RX window. Generally a bigger value means higher throughput but more memory. Most of time we should NOT change the default value unless special reason, e.g. test the maximum UDP RX throughput with iperf etc. For iperf test in shieldbox, the recommended value is 9~12. config ESP32_WIFI_NVS_ENABLED bool "WiFi NVS flash" default y help Select this option to enable WiFi NVS flash choice ESP32_WIFI_TASK_CORE_ID depends on !FREERTOS_UNICORE prompt "WiFi Task Core ID" default ESP32_WIFI_TASK_PINNED_TO_CORE_0 help Pinned WiFi task to core 0 or core 1. config ESP32_WIFI_TASK_PINNED_TO_CORE_0 bool "Core 0" config ESP32_WIFI_TASK_PINNED_TO_CORE_1 bool "Core 1" endchoice endmenu # Wi-Fi menu PHY config ESP32_PHY_CALIBRATION_AND_DATA_STORAGE bool "Store phy calibration data in NVS" default y help If this option is enabled, NVS will be initialized and calibration data will be loaded from there. PHY calibration will be skipped on deep sleep wakeup. If calibration data is not found, full calibration will be performed and stored in NVS. Normally, only partial calibration will be performed. If this option is disabled, full calibration will be performed. If it's easy that your board calibrate bad data, choose 'n'. Two cases for example, you should choose 'n': 1.If your board is easy to be booted up with antenna disconnected. 2.Because of your board design, each time when you do calibration, the result are too unstable. If unsure, choose 'y'. config ESP32_PHY_INIT_DATA_IN_PARTITION bool "Use a partition to store PHY init data" default n help If enabled, PHY init data will be loaded from a partition. When using a custom partition table, make sure that PHY data partition is included (type: 'data', subtype: 'phy'). With default partition tables, this is done automatically. If PHY init data is stored in a partition, it has to be flashed there, otherwise runtime error will occur. If this option is not enabled, PHY init data will be embedded into the application binary. If unsure, choose 'n'. config ESP32_PHY_MAX_WIFI_TX_POWER int "Max WiFi TX power (dBm)" range 0 20 default 20 help Set maximum transmit power for WiFi radio. Actual transmit power for high data rates may be lower than this setting. config ESP32_PHY_MAX_TX_POWER int default ESP32_PHY_MAX_WIFI_TX_POWER endmenu # PHY menu "Power Management" config PM_ENABLE bool "Support for power management" default n help If enabled, application is compiled with support for power management. This option has run-time overhead (increased interrupt latency, longer time to enter idle state), and it also reduces accuracy of RTOS ticks and timers used for timekeeping. Enable this option if application uses power management APIs. config PM_DFS_INIT_AUTO bool "Enable dynamic frequency scaling (DFS) at startup" depends on PM_ENABLE default n help If enabled, startup code configures dynamic frequency scaling. Max CPU frequency is set to CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ setting, min frequency is set to XTAL frequency. If disabled, DFS will not be active until the application configures it using esp_pm_configure function. config PM_USE_RTC_TIMER_REF bool "Use RTC timer to prevent time drift (EXPERIMENTAL)" depends on PM_ENABLE && (ESP32_TIME_SYSCALL_USE_RTC || ESP32_TIME_SYSCALL_USE_RTC_FRC1) default n help When APB clock frequency changes, high-resolution timer (esp_timer) scale and base value need to be adjusted. Each adjustment may cause small error, and over time such small errors may cause time drift. If this option is enabled, RTC timer will be used as a reference to compensate for the drift. It is recommended that this option is only used if 32k XTAL is selected as RTC clock source. config PM_PROFILING bool "Enable profiling counters for PM locks" depends on PM_ENABLE default n help If enabled, esp_pm_* functions will keep track of the amount of time each of the power management locks has been held, and esp_pm_dump_locks function will print this information. This feature can be used to analyze which locks are preventing the chip from going into a lower power state, and see what time the chip spends in each power saving mode. This feature does incur some run-time overhead, so should typically be disabled in production builds. config PM_TRACE bool "Enable debug tracing of PM using GPIOs" depends on PM_ENABLE default n help If enabled, some GPIOs will be used to signal events such as RTOS ticks, frequency switching, entry/exit from idle state. Refer to pm_trace.c file for the list of GPIOs. This feature is intended to be used when analyzing/debugging behavior of power management implementation, and should be kept disabled in applications. endmenu # "Power Management"