Chapter 2. API Reference
CONFIG_ESP32S2_RTC_XTAL_CAL_RETRY
Number of attempts to repeat 32k XTAL calibration
Found in: Component config > ESP32S2-specific
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.
Default value:
• 3 if ESP32S2_RTC_CLK_SRC_EXT_CRYS
CONFIG_ESP32S2_NO_BLOBS
No Binary Blobs
Found in: Component config > ESP32S2-specific
If enabled, this disables the linking of binary libraries in the application build. Note that after enabling
this Wi-Fi/Bluetooth will not work.
Default value:
• No (disabled)
CONFIG_ESP32S2_KEEP_USB_ALIVE
Keep USB peripheral enabled at start up
Found in: Component config > ESP32S2-specific
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.
Default value:
• Yes (enabled) if ESP_CONSOLE_USB_CDC
CONFIG_ESP32S2_RTCDATA_IN_FAST_MEM
Place RTC_DATA_ATTR and RTC_RODATA_ATTR variables into RTC fast memory segment
Found in: Component config > ESP32S2-specific
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.
Default value:
• No (disabled)
CONFIG_ESP32S2_USE_FIXED_STATIC_RAM_SIZE
Use fixed static RAM size
Found in: Component config > ESP32S2-specific
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
Default value:
• No (disabled)
Espressif Systems 1106
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