|
|
@@ -0,0 +1,163 @@
|
|
|
+/* 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_deepsleep.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
|
|
|
+
|
|
|
+/* 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-8CDT-9,M4.2.0/2,M9.2.0/3", 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);
|
|
|
+
|
|
|
+ const int deep_sleep_sec = 10;
|
|
|
+ ESP_LOGI(TAG, "Entering deep sleep for %d seconds", deep_sleep_sec);
|
|
|
+ system_deep_sleep(1000000LL * deep_sleep_sec);
|
|
|
+}
|
|
|
+
|
|
|
+static void obtain_time(void)
|
|
|
+{
|
|
|
+ nvs_flash_init();
|
|
|
+ system_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);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void initialize_sntp(void)
|
|
|
+{
|
|
|
+ ESP_LOGI(TAG, "Initializing SNTP");
|
|
|
+ sntp_setoperatingmode(SNTP_OPMODE_POLL);
|
|
|
+ sntp_setservername(0, "pool.ntp.org");
|
|
|
+ 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(WIFI_IF_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;
|
|
|
+}
|
Ivan Grokhotkov