Tough RTC Real-Time Clock

#define WIFI_SSID "********" #define WIFI_PASSWORD "********" #define NTP_TIMEZONE "UTC-8" // POSIX standard, in which "UTC+0" is UTC London, "UTC-8" is UTC+8 Beijing, "UTC+5" is UTC-5 New York #define NTP_SERVER1 "0.pool.ntp.org" #define NTP_SERVER2 "1.pool.ntp.org" #define NTP_SERVER3 "2.pool.ntp.org" #include <WiFi.h> // Different versions of the framework have different SNTP header file names and availability. #if __has_include(<esp_sntp.h>) #include <esp_sntp.h> #define SNTP_ENABLED 1 #elif __has_include(<sntp.h>) #include <sntp.h> #define SNTP_ENABLED 1 #endif #ifndef SNTP_ENABLED #define SNTP_ENABLED 0 #endif #include <M5Unified.h> static constexpr const char* const wd[7] = { "Sun", "Mon", "Tue", "Wed", "Thr", "Fri", "Sat" }; void setup() { M5.begin(); M5.Display.setRotation(1); M5.Display.setFont(&fonts::FreeMono12pt7b); if (!M5.Rtc.isEnabled()) { M5.Display.println("RTC not found"); while (true) { delay(500); } } M5.Display.println("RTC found"); M5.Display.print("WiFi: "); WiFi.begin(WIFI_SSID, WIFI_PASSWORD); while (WiFi.status() != WL_CONNECTED) { M5.Display.print("."); delay(500); } M5.Display.println("\nWiFi connected"); configTzTime(NTP_TIMEZONE, NTP_SERVER1, NTP_SERVER2, NTP_SERVER3); M5.Display.print("NTP: "); #if SNTP_ENABLED while (sntp_get_sync_status() != SNTP_SYNC_STATUS_COMPLETED) { M5.Display.print("."); delay(500); } #else struct tm timeInfo; while (!getLocalTime(&timeInfo, 1000)) { M5.Display.print("."); delay(500); } #endif M5.Display.println("\nNTP connected"); time_t t = time(nullptr) + 1; // Advance one second while (t > time(nullptr)) ; // Synchronization in seconds M5.Rtc.setDateTime(gmtime(&t)); delay(1000); M5.Display.clear(); } void loop() { auto dt = M5.Rtc.getDateTime(); M5.Display.setCursor(0, 0); M5.Display.printf("RTC UTC: \n%04d/%02d/%02d (%s) \n%02d:%02d:%02d", dt.date.year, dt.date.month, dt.date.date, wd[dt.date.weekDay], dt.time.hours, dt.time.minutes, dt.time.seconds); // ESP32 internal timer auto t = time(nullptr); { auto tm = gmtime(&t); // for UTC M5.Display.setCursor(0, 80); M5.Display.printf("ESP32 UTC: \n%04d/%02d/%02d (%s) \n%02d:%02d:%02d", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, wd[tm->tm_wday], tm->tm_hour, tm->tm_min, tm->tm_sec); } { auto tm = localtime(&t); // for local timezone M5.Display.setCursor(0, 160); M5.Display.printf("ESP32 %s: \n%04d/%02d/%02d (%s) \n%02d:%02d:%02d", NTP_TIMEZONE, tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, wd[tm->tm_wday], tm->tm_hour, tm->tm_min, tm->tm_sec); } delay(500); }