esp-idf/examples/system/app_trace_to_host/main/Kconfig.projbuild

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menu "Example Configuration"
config CUSTOM_RTC_CLK_8M_DIV
bool "Set custom RTC 8 MHz clock divider to lower CW frequency (CHECK HELP FIRST)"
default "n"
help
Set custom / non standard divider for RTC 8 MHz clock.
This is to lower minimum frequency of cosine waveform generator (CW)
in order to provide sinusoidal signal at about 50 or 60 Hz.
WARNINIG: setting non standard divider for the RTC 8 MHz clock
will affect functionality of RTC peripherals other than CW.
This includes ADC sampling, and will in general make
all RTC register access slower.
DO NOT use this option / change default RTC 8 MHz clock divider
in your applications, if you are not sure what you are doing.
endmenu