128 lines
4.7 KiB
C
128 lines
4.7 KiB
C
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef __SNTP_H__
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#define __SNTP_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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* The time update takes place in the sntp_sync_time() function.
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* The user has the ability to redefine this function in order
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* to re-define its functionality. This function has two time update modes,
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* which can be set via the sntp_set_sync_mode() function.
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* Two modes are available:
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* - the first is an immediate update when receiving time from the sntp server,
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* - the second is a smooth time update (if the time error is no more than 35 minutes,
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* and an immediate update if the error is more than 35 minutes).
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*
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* To receive notification of time synchronization,
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* you can use the callback function or get the synchronization status
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* via the sntp_get_sync_status() function.
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*
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* To determine the time synchronization time on the device, you can use:
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* 1) sntp_set_time_sync_notification_cb() function to set the callback function,
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* which is convenient to use to receive notification of the update time.
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* 2) sntp_get_sync_status() function for getting time synchronization status.
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* After the time synchronization is completed, the status will be
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* SNTP_SYNC_STATUS_COMPLETED, after, it will be reseted to SNTP_SYNC_STATUS_RESET
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* to wait for the next sync cycle.
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*/
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/// SNTP time update mode
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typedef enum {
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SNTP_SYNC_MODE_IMMED, /*!< Update system time immediately when receiving a response from the SNTP server. */
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SNTP_SYNC_MODE_SMOOTH, /*!< Smooth time updating. Time error is gradually reduced using adjtime function. If the difference between SNTP response time and system time is large (more than 35 minutes) then update immediately. */
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} sntp_sync_mode_t;
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/// SNTP sync status
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typedef enum {
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SNTP_SYNC_STATUS_RESET, // Reset status.
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SNTP_SYNC_STATUS_COMPLETED, // Time is synchronized.
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SNTP_SYNC_STATUS_IN_PROGRESS, // Smooth time sync in progress.
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} sntp_sync_status_t;
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/**
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* @brief SNTP callback function for notifying about time sync event
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*
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* @param tv Time received from SNTP server.
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*/
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typedef void (*sntp_sync_time_cb_t) (struct timeval *tv);
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/**
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* @brief This function updates the system time.
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*
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* This is a weak-linked function. It is possible to replace all SNTP update functionality
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* by placing a sntp_sync_time() function in the app firmware source.
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* If the default implementation is used, calling sntp_set_sync_mode() allows
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* the time synchronization mode to be changed to instant or smooth.
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* If a callback function is registered via sntp_set_time_sync_notification_cb(),
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* it will be called following time synchronization.
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*
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* @param tv Time received from SNTP server.
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*/
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void sntp_sync_time(struct timeval *tv);
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/**
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* @brief Set the sync mode
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*
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* Allowable two mode: SNTP_SYNC_MODE_IMMED and SNTP_SYNC_MODE_SMOOTH.
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* @param sync_mode Sync mode.
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*/
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void sntp_set_sync_mode(sntp_sync_mode_t sync_mode);
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/**
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* @brief Get set sync mode
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*
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* @return SNTP_SYNC_MODE_IMMED: Update time immediately.
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* SNTP_SYNC_MODE_SMOOTH: Smooth time updating.
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*/
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sntp_sync_mode_t sntp_get_sync_mode(void);
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/**
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* @brief Get status of time sync
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*
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* After the update is completed, the status will be returned as SNTP_SYNC_STATUS_COMPLETED.
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* After that, the status will be reset to SNTP_SYNC_STATUS_RESET.
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* If the update operation is not completed yet, the status will be SNTP_SYNC_STATUS_RESET.
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* If a smooth mode was chosen and the synchronization is still continuing (adjtime works), then it will be SNTP_SYNC_STATUS_IN_PROGRESS.
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*
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* @return SNTP_SYNC_STATUS_RESET: Reset status.
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* SNTP_SYNC_STATUS_COMPLETED: Time is synchronized.
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* SNTP_SYNC_STATUS_IN_PROGRESS: Smooth time sync in progress.
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*/
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sntp_sync_status_t sntp_get_sync_status(void);
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/**
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* @brief Set status of time sync
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*
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* @param sync_status status of time sync (see sntp_sync_status_t)
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*/
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void sntp_set_sync_status(sntp_sync_status_t sync_status);
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/**
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* @brief Set a callback function for time synchronization notification
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*
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* @param callback a callback function
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*/
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void sntp_set_time_sync_notification_cb(sntp_sync_time_cb_t callback);
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#ifdef __cplusplus
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}
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#endif
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#endif // __SNTP_H__
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