esp-idf/components/esp_hw_support/port/esp32c2/Kconfig.hw_support

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config ESP32C2_XTAL_FREQ
int
default 40 if ESP32C2_XTAL_FREQ_40
default 26 if ESP32C2_XTAL_FREQ_26
choice ESP32C2_XTAL_FREQ_SEL
prompt "Main XTAL frequency"
default ESP32C2_XTAL_FREQ_40
help
ESP32-C2 currently supports the following XTAL frequencies:
- 26 MHz
- 40 MHz
This option must be set to the correct value for the given hardware.
config ESP32C2_XTAL_FREQ_40 # TODO: IDF-5488
bool "40 MHz"
config ESP32C2_XTAL_FREQ_26
bool "26 MHz"
endchoice