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 ESP32_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 ESP32_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 && !SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY 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 FREERTOS_SUPPORT_STATIC_ALLOCATION endchoice 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_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 4194304 if SPIRAM_TYPE_ESPPSRAM32 default 8388608 if SPIRAM_TYPE_ESPPSRAM64 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 for SPI RAM of type 32MBit, one of the HSPI/VSPI host will be occupied by the system. Which SPI host to use can be selected by the config item SPIRAM_OCCUPY_SPI_HOST. Application code should never touch HSPI/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 (-mfix-esp32-psram-cache-issue) 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_BANKSWITCH_ENABLE bool "Enable bank switching for >4MiB external RAM" default y depends on SPIRAM_USE_MEMMAP || SPIRAM_USE_CAPS_ALLOC || SPIRAM_USE_MALLOC help The ESP32 only supports 4MiB of external RAM in its address space. The hardware does support larger memories, but these have to be bank-switched in and out of this address space. Enabling this allows you to reserve some MMU pages for this, which allows the use of the esp_himem api to manage these banks. #Note that this is limited to 62 banks, as esp_spiram_writeback_cache needs some kind of mapping of #some banks below that mark to work. We cannot at this moment guarantee this to exist when himem is #enabled. config SPIRAM_BANKSWITCH_RESERVE int "Amount of 32K pages to reserve for bank switching" depends on SPIRAM_BANKSWITCH_ENABLE default 8 range 1 62 help Select the amount of banks reserved for bank switching. Note that the amount of RAM allocatable with malloc/esp_heap_alloc_caps will decrease by 32K for each page reserved here. Note that this reservation is only actually done if your program actually uses the himem API. Without any himem calls, the reservation is not done and the original amount of memory will be available to malloc/esp_heap_alloc_caps. 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 SPIRAM_TRY_ALLOCATE_WIFI_LWIP 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. config SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY bool "Allow .bss segment placed in external memory" default n depends on ESP32_SPIRAM_SUPPORT help If enabled the option,and add EXT_RAM_ATTR defined your variable,then your variable will be placed in PSRAM instead of internal memory, and placed most of variables of lwip,net802.11,pp,bluedroid library to external memory defaultly. choice SPIRAM_OCCUPY_SPI_HOST prompt "SPI host to use for 32MBit PSRAM" default SPIRAM_OCCUPY_VSPI_HOST depends on SPIRAM_SPEED_80M help When both flash and PSRAM is working under 80MHz, and the PSRAM is of type 32MBit, one of the HSPI/VSPI host will be used to output the clock. Select which one to use here. config SPIRAM_OCCUPY_HSPI_HOST bool "HSPI host (SPI2)" config SPIRAM_OCCUPY_VSPI_HOST bool "VSPI host (SPI3)" endchoice menu "PSRAM clock and cs IO for ESP32-DOWD" config D0WD_PSRAM_CLK_IO int "PSRAM CLK IO number" depends on ESP32_SPIRAM_SUPPORT range 0 33 default 17 help The PSRAM CLOCK IO can be any unused GPIO, user can config it based on hardware design. If user use 1.8V flash and 1.8V psram, this value can only be one of 6, 7, 8, 9, 10, 11, 16, 17. config D0WD_PSRAM_CS_IO int "PSRAM CS IO number" depends on ESP32_SPIRAM_SUPPORT range 0 33 default 16 help The PSRAM CS IO can be any unused GPIO, user can config it based on hardware design. If user use 1.8V flash and 1.8V psram, this value can only be one of 6, 7, 8, 9, 10, 11, 16, 17. endmenu menu "PSRAM clock and cs IO for ESP32-D2WD" config D2WD_PSRAM_CLK_IO int "PSRAM CLK IO number" depends on ESP32_SPIRAM_SUPPORT range 0 33 default 9 help User can config it based on hardware design. For ESP32-D2WD chip, the psram can only be 1.8V psram, so this value can only be one of 6, 7, 8, 9, 10, 11, 16, 17. config D2WD_PSRAM_CS_IO int "PSRAM CS IO number" depends on ESP32_SPIRAM_SUPPORT range 0 33 default 10 help User can config it based on hardware design. For ESP32-D2WD chip, the psram can only be 1.8V psram, so this value can only be one of 6, 7, 8, 9, 10, 11, 16, 17. endmenu menu "PSRAM clock and cs IO for ESP32-PICO" config PICO_PSRAM_CS_IO int "PSRAM CS IO number" depends on ESP32_SPIRAM_SUPPORT range 0 33 default 10 help The PSRAM CS IO can be any unused GPIO, user can config it based on hardware design. For ESP32-PICO chip, the psram share clock with flash, so user do not need to configure the clock IO. For the reference hardware design, please refer to https://www.espressif.com/sites/default/files/documentation/esp32-pico-d4_datasheet_en.pdf endmenu config SPIRAM_SPIWP_SD3_PIN int "SPI PSRAM WP(SD3) Pin when customising pins via eFuse (read help)" depends on ESPTOOLPY_FLASHMODE_DIO || ESPTOOLPY_FLASHMODE_DOUT range 0 33 default 7 help This value is ignored unless flash mode is set to DIO or DOUT and the SPI flash pins have been overriden by setting the eFuses SPI_PAD_CONFIG_xxx. When this is the case, the eFuse config only defines 3 of the 4 Quad I/O data pins. The WP pin (aka ESP32 pin "SD_DATA_3" or SPI flash pin "IO2") is not specified in eFuse. And the psram only has QPI mode, the WP pin is necessary, so we need to configure this value here. When flash mode is set to QIO or QOUT, the PSRAM WP pin will be set as the value configured in bootloader. For ESP32-PICO chip, the default value of this config should be 7. endmenu # "SPI RAM config" config ESP32_MEMMAP_TRACEMEM bool default "n" config ESP32_MEMMAP_TRACEMEM_TWOBANKS bool default "n" config ESP32_TRAX bool "Use TRAX tracing feature" default "n" select ESP32_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 ESP32_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 ESP32_TRACEMEM_RESERVE_DRAM hex default 0x8000 if ESP32_MEMMAP_TRACEMEM && ESP32_MEMMAP_TRACEMEM_TWOBANKS default 0x4000 if ESP32_MEMMAP_TRACEMEM && !ESP32_MEMMAP_TRACEMEM_TWOBANKS default 0x0 choice ESP32_UNIVERSAL_MAC_ADDRESSES bool "Number of universally administered (by IEEE) MAC address" default ESP32_UNIVERSAL_MAC_ADDRESSES_FOUR 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 ESP32_UNIVERSAL_MAC_ADDRESSES_TWO bool "Two" config ESP32_UNIVERSAL_MAC_ADDRESSES_FOUR bool "Four" endchoice config ESP32_UNIVERSAL_MAC_ADDRESSES int default 2 if ESP32_UNIVERSAL_MAC_ADDRESSES_TWO default 4 if ESP32_UNIVERSAL_MAC_ADDRESSES_FOUR config ESP32_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 ESP32_ULP_COPROC_RESERVE_MEM int prompt "RTC slow memory reserved for coprocessor" if ESP32_ULP_COPROC_ENABLED default 512 if ESP32_ULP_COPROC_ENABLED range 32 8192 if ESP32_ULP_COPROC_ENABLED default 0 if !ESP32_ULP_COPROC_ENABLED range 0 0 if !ESP32_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 COMPILER_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 ESP32_BROWNOUT_DET #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. 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 ESP32_BROWNOUT_DET_LVL_SEL prompt "Brownout voltage level" depends on ESP32_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 ESP32_BROWNOUT_DET_LVL_SEL_0 bool "2.43V +/- 0.05" config ESP32_BROWNOUT_DET_LVL_SEL_1 bool "2.48V +/- 0.05" config ESP32_BROWNOUT_DET_LVL_SEL_2 bool "2.58V +/- 0.05" config ESP32_BROWNOUT_DET_LVL_SEL_3 bool "2.62V +/- 0.05" config ESP32_BROWNOUT_DET_LVL_SEL_4 bool "2.67V +/- 0.05" config ESP32_BROWNOUT_DET_LVL_SEL_5 bool "2.70V +/- 0.05" config ESP32_BROWNOUT_DET_LVL_SEL_6 bool "2.77V +/- 0.05" config ESP32_BROWNOUT_DET_LVL_SEL_7 bool "2.80V +/- 0.05" endchoice config ESP32_BROWNOUT_DET_LVL int default 0 if ESP32_BROWNOUT_DET_LVL_SEL_0 default 1 if ESP32_BROWNOUT_DET_LVL_SEL_1 default 2 if ESP32_BROWNOUT_DET_LVL_SEL_2 default 3 if ESP32_BROWNOUT_DET_LVL_SEL_3 default 4 if ESP32_BROWNOUT_DET_LVL_SEL_4 default 5 if ESP32_BROWNOUT_DET_LVL_SEL_5 default 6 if ESP32_BROWNOUT_DET_LVL_SEL_6 default 7 if ESP32_BROWNOUT_DET_LVL_SEL_7 #Reduce PHY TX power when brownout reset config ESP32_REDUCE_PHY_TX_POWER bool "Reduce PHY TX power when brownout reset" depends on ESP32_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_CLK_SRC prompt "RTC clock source" default ESP32_RTC_CLK_SRC_INT_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_CLK_SRC_INT_RC bool "Internal 150kHz RC oscillator" config ESP32_RTC_CLK_SRC_EXT_CRYS bool "External 32kHz crystal" config ESP32_RTC_CLK_SRC_EXT_OSC bool "External 32kHz oscillator at 32K_XP pin" config ESP32_RTC_CLK_SRC_INT_8MD256 bool "Internal 8.5MHz oscillator, divided by 256 (~33kHz)" endchoice config ESP32_RTC_EXT_CRYST_ADDIT_CURRENT bool "Additional current for external 32kHz crystal" depends on ESP32_RTC_CLK_SRC_EXT_CRYS default "n" help Choose which additional current is used for rtc external crystal. - With some 32kHz crystal configurations, the X32N and X32P pins may not have enough drive strength to keep the crystal oscillating during deep sleep. If this option is enabled, additional current from touchpad 9 is provided internally to drive the 32kHz crystal. If this option is enabled, deep sleep current is slightly higher (4-5uA) and the touchpad and ULP wakeup sources are not available. config ESP32_RTC_CLK_CAL_CYCLES int "Number of cycles for RTC_SLOW_CLK calibration" default 3000 if ESP32_RTC_CLK_SRC_EXT_CRYS default 1024 if ESP32_RTC_CLK_SRC_INT_RC range 0 27000 if ESP32_RTC_CLK_SRC_EXT_CRYS || ESP32_RTC_CLK_SRC_EXT_OSC || ESP32_RTC_CLK_SRC_INT_8MD256 range 0 32766 if ESP32_RTC_CLK_SRC_INT_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_CLK_SRC_EXT_CRYS 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 ESP32_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 ESP32_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 ESP32_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 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. config ESP32_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 ESP32_FIXED_STATIC_RAM_SIZE config ESP32_FIXED_STATIC_RAM_SIZE hex "Fixed Static RAM size" default 0x1E000 range 0 0x2c200 depends on ESP32_USE_FIXED_STATIC_RAM_SIZE help RAM size dedicated for static variables (.data & .bss sections). Please note that the actual length will be reduced by BT_RESERVE_DRAM if Bluetooth controller is enabled. endmenu # ESP32-Specific 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"