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SourceVuESP-IDF Framework and ExamplesESP-IDFrtc_clk_32k_bootstrap()

rtc_clk_32k_bootstrap() function

Enable 32k oscillator, configuring it for fast startup time. Note: to achieve higher frequency stability, rtc_clk_32k_enable function must be called one the 32k XTAL oscillator has started up. This function will initially disable the 32k XTAL oscillator, so it should not be called when the system is using 32k XTAL as RTC_SLOW_CLK.

Syntax

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Summary

Declaration

Definition

void rtc_clk_32k_bootstrap(uint32_t cycle);

Implemented in rtc_clk.c:122

Arguments

Argument

Description

cycle

Number of 32kHz cycles to bootstrap external crystal. If 0, no square wave will be used to bootstrap crystal oscillation.

References

Code

Location

Referrer

void rtc_clk_32k_bootstrap(uint32_t cycle)

void rtc_clk_32k_bootstrap(uint32_t cycle);

rtc_clk_32k_bootstrap(CONFIG_ESP_SYSTEM_RTC_EXT_XTAL_BOOTSTRAP_CYCLES);

bootloader_clock_init.c:89

bootloader_clock_configure()

Call Tree

rtc_clk_32k_bootstrap() is called by 1 function and calls 8 functions:

bootloader_clock_configure()

rtc_clk_32k_bootstrap()

__assert_func()

esp_rom_delay_us()

esp_rom_gpio_pad_select_gpio()

gpio_ll_output_disable()

gpio_ll_output_enable()

gpio_ll_set_level()

clk_ll_xtal32k_disable()

rtc_clk_32k_enable_common()

Data Use

rtc_clk_32k_bootstrap() reads 1 variable:

clk_ll_xtal32k_enable_mode_t::CLK_LL_XTAL32K_ENABLE_MODE_BOOTSTRAP

rtc_clk_32k_bootstrap()

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