esp32-alarm-clock/main/time_sync.c

/*
 * SPDX-FileCopyrightText: 2022 Helmut Pozimski <helmut@pozimski.eu>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 */
 
#include <apps/esp_sntp.h>
#include <esp_log.h>

#include "ds3231.h"

#define TAG "sntp"
 
static void time_sync_callback(struct timeval *tv) {
    struct tm date_time;
    localtime_r(&tv->tv_sec, &date_time);
    ds3231_write_date_time(date_time);
}

void sntp_start(uint32_t sync_interval) {
	sntp_setoperatingmode(SNTP_OPMODE_POLL);
   sntp_setservername(0, "pool.ntp.org");
   sntp_set_time_sync_notification_cb(time_sync_callback);
   sntp_init();
   sntp_set_sync_interval(sync_interval);
}

void await_sntp_sync() {
    while (sntp_get_sync_status() == SNTP_SYNC_STATUS_RESET) {
        ESP_LOGI(TAG, "Waiting for system time to be set...");
        vTaskDelay(2000 / portTICK_PERIOD_MS);
    }

}