kopia lustrzana https://github.com/espressif/esp-idf
78 wiersze
2.5 KiB
C
78 wiersze
2.5 KiB
C
// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#pragma once
|
|
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* @file esp_clk.h
|
|
*
|
|
* This file contains declarations of clock related functions.
|
|
*/
|
|
|
|
/**
|
|
* @brief Get the calibration value of RTC slow clock
|
|
*
|
|
* The value is in the same format as returned by rtc_clk_cal (microseconds,
|
|
* in Q13.19 fixed-point format).
|
|
*
|
|
* @return the calibration value obtained using rtc_clk_cal, at startup time
|
|
*/
|
|
uint32_t esp_clk_slowclk_cal_get(void);
|
|
|
|
/**
|
|
* @brief Update the calibration value of RTC slow clock
|
|
*
|
|
* The value has to be in the same format as returned by rtc_clk_cal (microseconds,
|
|
* in Q13.19 fixed-point format).
|
|
* This value is used by timekeeping functions (such as gettimeofday) to
|
|
* calculate current time based on RTC counter value.
|
|
* @param value calibration value obtained using rtc_clk_cal
|
|
*/
|
|
void esp_clk_slowclk_cal_set(uint32_t value);
|
|
|
|
/**
|
|
* @brief Return current CPU clock frequency
|
|
* When frequency switching is performed, this frequency may change.
|
|
* However it is guaranteed that the frequency never changes with a critical
|
|
* section.
|
|
*
|
|
* @return CPU clock frequency, in Hz
|
|
*/
|
|
int esp_clk_cpu_freq(void);
|
|
|
|
/**
|
|
* @brief Return current APB clock frequency
|
|
*
|
|
* When frequency switching is performed, this frequency may change.
|
|
* However it is guaranteed that the frequency never changes with a critical
|
|
* section.
|
|
*
|
|
* @return APB clock frequency, in Hz
|
|
*/
|
|
int esp_clk_apb_freq(void);
|
|
|
|
|
|
/**
|
|
* @brief Read value of RTC counter, converting it to microseconds
|
|
* @attention The value returned by this function may change abruptly when
|
|
* calibration value of RTC counter is updated via esp_clk_slowclk_cal_set
|
|
* function. This should not happen unless application calls esp_clk_slowclk_cal_set.
|
|
* In ESP-IDF, esp_clk_slowclk_cal_set is only called in startup code.
|
|
*
|
|
* @return Value or RTC counter, expressed in microseconds
|
|
*/
|
|
uint64_t esp_clk_rtc_time(void);
|