kopia lustrzana https://github.com/espressif/esp-idf
101 wiersze
2.7 KiB
C
101 wiersze
2.7 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @file esp_clk.h
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*
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* This file contains declarations of clock related functions.
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*/
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/**
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* @brief Get the calibration value of RTC slow clock
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*
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* The value is in the same format as returned by rtc_clk_cal (microseconds,
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* in Q13.19 fixed-point format).
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*
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* @return the calibration value obtained using rtc_clk_cal, at startup time
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*/
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uint32_t esp_clk_slowclk_cal_get(void);
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/**
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* @brief Update the calibration value of RTC slow clock
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*
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* The value has to be in the same format as returned by rtc_clk_cal (microseconds,
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* in Q13.19 fixed-point format).
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* This value is used by timekeeping functions (such as gettimeofday) to
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* calculate current time based on RTC counter value.
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* @param value calibration value obtained using rtc_clk_cal
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*/
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void esp_clk_slowclk_cal_set(uint32_t value);
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/**
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* @brief Return current CPU clock frequency
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* When frequency switching is performed, this frequency may change.
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* However it is guaranteed that the frequency never changes with a critical
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* section.
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*
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* @return CPU clock frequency, in Hz
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*/
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int esp_clk_cpu_freq(void);
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/**
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* @brief Return current APB clock frequency
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*
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* When frequency switching is performed, this frequency may change.
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* However it is guaranteed that the frequency never changes with a critical
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* section.
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*
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* @return APB clock frequency, in Hz
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*/
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int esp_clk_apb_freq(void);
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/**
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* @brief Return frequency of the main XTAL
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*
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* Frequency of the main XTAL can be either auto-detected or set at compile
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* time (see CONFIG_XTAL_FREQ_SEL sdkconfig option). In both cases, this
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* function returns the actual value at run time.
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*
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* @return XTAL frequency, in Hz
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*/
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int esp_clk_xtal_freq(void);
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/**
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* @brief Read value of RTC counter, converting it to microseconds
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* @attention The value returned by this function may change abruptly when
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* calibration value of RTC counter is updated via esp_clk_slowclk_cal_set
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* function. This should not happen unless application calls esp_clk_slowclk_cal_set.
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* In ESP-IDF, esp_clk_slowclk_cal_set is only called in startup code.
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*
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* @return Value or RTC counter, expressed in microseconds
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*/
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uint64_t esp_clk_rtc_time(void);
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/**
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* @brief obtain internal critical section used esp_clk implementation.
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*
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* This is used by the esp_light_sleep_start() to avoid deadlocking when it
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* calls esp_clk related API after stalling the other CPU.
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*/
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void esp_clk_private_lock(void);
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/**
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* @brief counterpart of esp_clk_private_lock
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*/
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void esp_clk_private_unlock(void);
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#ifdef __cplusplus
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}
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#endif
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