esp32, SNTPで UTC/JST 時刻を取得する。 ESP-IDF

esp32 での、SNTP JST 取得、ESP-IDF 版
事例が少なかったので、メモです。

時刻の表示や、指定時刻のデバイス稼動制御
等で使えそうです。

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# Code
UTC 時間を取得し、 struct tm
に、日本時間 JST (UTC + 9) を計算し、設定しておきます。

	/* LwIP SNTP example
	This example code is in the Public Domain (or CC0 licensed, at your option.)
	Unless required by applicable law or agreed to in writing, this
	software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
	CONDITIONS OF ANY KIND, either express or implied.
	*/
	#include <string.h>
	#include <time.h>
	#include <sys/time.h>
	#include "freertos/FreeRTOS.h"
	#include "freertos/task.h"
	#include "freertos/event_groups.h"
	#include "esp_system.h"
	#include "esp_wifi.h"
	#include "esp_event_loop.h"
	#include "esp_log.h"
	#include "esp_attr.h"
	#include "esp_deep_sleep.h"
	#include "nvs_flash.h"
	#include "lwip/err.h"
	#include "apps/sntp/sntp.h"
	/* The examples use simple WiFi configuration that you can set via
	'make menuconfig'.
	If you'd rather not, just change the below entries to strings with
	the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
	*/
	//#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
	//#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
	#define EXAMPLE_WIFI_SSID "your-SSID"
	#define EXAMPLE_WIFI_PASS "your-PASS"
	/* FreeRTOS event group to signal when we are connected & ready to make a request */
	static EventGroupHandle_t wifi_event_group;
	/* The event group allows multiple bits for each event,
	but we only care about one event - are we connected
	to the AP with an IP? */
	const int CONNECTED_BIT = BIT0;
	static const char *TAG = "example";
	/* Variable holding number of times ESP32 restarted since first boot.
	* It is placed into RTC memory using RTC_DATA_ATTR and
	* maintains its value when ESP32 wakes from deep sleep.
	*/
	RTC_DATA_ATTR static int boot_count = 0;
	static void obtain_time(void);
	static void initialize_sntp(void);
	static void initialise_wifi(void);
	static esp_err_t event_handler(void *ctx, system_event_t *event);
	void app_main()
	{
	++boot_count;
	ESP_LOGI(TAG, "Boot count: %d", boot_count);
	time_t now;
	struct tm timeinfo;
	time(&now);
	localtime_r(&now, &timeinfo);
	// Is time set? If not, tm_year will be (1970 - 1900).
	if (timeinfo.tm_year < (2016 - 1900)) {
	ESP_LOGI(TAG, "Time is not set yet. Connecting to WiFi and getting time over NTP.");
	obtain_time();
	// update 'now' variable with current time
	time(&now);
	}
	char strftime_buf[64];
	// Set timezone to Eastern Standard Time and print local time
	/*
	setenv("TZ", "EST5EDT,M3.2.0/2,M11.1.0", 1);
	tzset();
	localtime_r(&now, &timeinfo);
	strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
	ESP_LOGI(TAG, "The current date/time in New York is: %s", strftime_buf);
	*/
	// Set timezone to China Standard Time
	/*
	setenv("TZ", "CST-8", 1);
	tzset();
	localtime_r(&now, &timeinfo);
	strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
	ESP_LOGI(TAG, "The current date/time in Shanghai is: %s", strftime_buf);
	*/
	// Set timezone to xx
	setenv("TZ", "UTC", 1);
	tzset();
	localtime_r(&now, &timeinfo);
	strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
	ESP_LOGI(TAG, "The current date/time in UTC is: %s", strftime_buf);
	time_t t = now + (3600 * 9 );
	struct tm timeinfo_jst;
	localtime_r(&t , &timeinfo_jst);
	strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo_jst );
	ESP_LOGI(TAG, "The current date/time in JST-2 is: %s", strftime_buf);
	const int deep_sleep_sec = 10;
	ESP_LOGI(TAG, "Entering deep sleep for %d seconds", deep_sleep_sec);
	esp_deep_sleep(1000000LL * deep_sleep_sec);
	}
	static void obtain_time(void)
	{
	ESP_ERROR_CHECK( nvs_flash_init() );
	initialise_wifi();
	xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
	false, true, portMAX_DELAY);
	initialize_sntp();
	// wait for time to be set
	time_t now = 0;
	struct tm timeinfo = { 0 };
	int retry = 0;
	const int retry_count = 10;
	while(timeinfo.tm_year < (2016 - 1900) && ++retry < retry_count) {
	ESP_LOGI(TAG, "Waiting for system time to be set... (%d/%d)", retry, retry_count);
	vTaskDelay(2000 / portTICK_PERIOD_MS);
	time(&now);
	localtime_r(&now, &timeinfo);
	}
	ESP_ERROR_CHECK( esp_wifi_stop() );
	}
	static void initialize_sntp(void)
	{
	ESP_LOGI(TAG, "Initializing SNTP");
	sntp_setoperatingmode(SNTP_OPMODE_POLL);
	sntp_setservername(0, "pool.ntp.org");
	// sntp_setservername(0, "ntp.nict.jp" );
	sntp_init();
	}
	static void initialise_wifi(void)
	{
	tcpip_adapter_init();
	wifi_event_group = xEventGroupCreate();
	ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
	wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
	ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
	ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
	wifi_config_t wifi_config = {
	.sta = {
	.ssid = EXAMPLE_WIFI_SSID,
	.password = EXAMPLE_WIFI_PASS,
	},
	};
	ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
	ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
	ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
	ESP_ERROR_CHECK( esp_wifi_start() );
	}
	static esp_err_t event_handler(void *ctx, system_event_t *event)
	{
	switch(event->event_id) {
	case SYSTEM_EVENT_STA_START:
	esp_wifi_connect();
	break;
	case SYSTEM_EVENT_STA_GOT_IP:
	xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
	break;
	case SYSTEM_EVENT_STA_DISCONNECTED:
	/* This is a workaround as ESP32 WiFi libs don't currently
	auto-reassociate. */
	esp_wifi_connect();
	xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
	break;
	default:
	break;
	}
	return ESP_OK;
	}

view raw sntp_example_main.c hosted with ❤ by GitHub

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# Log

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