57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
// Copyright 2015-2017 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
|
|
|
|
/**
|
|
* @file esp_clk.h
|
|
*
|
|
* This file contains declarations of clock related functions.
|
|
* These functions are used in ESP-IDF components, but should not be considered
|
|
* to be part of public API.
|
|
*/
|
|
|
|
/**
|
|
* @brief Initialize clock-related settings
|
|
*
|
|
* Called from cpu_start.c, not intended to be called from other places.
|
|
* This function configures the CPU clock, RTC slow and fast clocks, and
|
|
* performs RTC slow clock calibration.
|
|
*/
|
|
void esp_clk_init(void);
|
|
|
|
|
|
/**
|
|
* @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();
|
|
|
|
|
|
/**
|
|
* @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);
|
|
|