# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
# SPDX-License-Identifier: Apache-2.0

if SOC_SERIES_ESP32S3

choice RTC_CLK_SRC
	prompt "RTC clock source"
	default RTC_CLK_SRC_INT_RC
	help
	  Choose which clock is used as RTC clock source.

	config RTC_CLK_SRC_INT_RC
		bool "Internal 136kHz RC oscillator"
	config RTC_CLK_SRC_EXT_CRYS
		bool "External 32kHz crystal"
		select ESP_SYSTEM_RTC_EXT_XTAL
	config RTC_CLK_SRC_EXT_OSC
		bool "External 32kHz oscillator at 32K_XP pin"
		select ESP_SYSTEM_RTC_EXT_OSC
	config RTC_CLK_SRC_INT_8MD256
		bool "Internal 17.5MHz oscillator, divided by 256"
endchoice

config RTC_CLK_CAL_CYCLES
	int "Number of cycles for RTC_SLOW_CLK calibration"
	default 3000 if RTC_CLK_SRC_EXT_CRYS || RTC_CLK_SRC_EXT_OSC || RTC_CLK_SRC_INT_8MD256
	default 1024 if RTC_CLK_SRC_INT_RC
	range 0 27000 if RTC_CLK_SRC_EXT_CRYS || RTC_CLK_SRC_EXT_OSC || RTC_CLK_SRC_INT_8MD256
	range 0 32766 if 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.

endif # SOC_SERIES_ESP32S3