CoreInk RTC clock related APIs and case programs.
#if defined(ARDUINO)#define WIFI_SSID "YOUR WIFI SSID NAME"#define WIFI_PASSWORD "YOUR WIFI PASSWORD"#define NTP_TIMEZONE "UTC-8"#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 #endif #ifndef SNTP_ENABLED#define SNTP_ENABLED 0#endif #include <M5Unified.h> void setup(void){ M5.begin(); if (!M5.Rtc.isEnabled()) { Serial.println("RTC not found."); M5.Display.println("RTC not found."); for (;;) { vTaskDelay(500); } } Serial.println("RTC found."); // It is recommended to set UTC for the RTC and ESP32 internal clocks. /* /// setup RTC ( direct setting ) // YYYY MM DD hh mm ss M5.Rtc.setDateTime( { { 2021, 12, 31 }, { 12, 34, 56 } } ); //*/ /// setup RTC ( NTP auto setting ) M5.Display.print("WiFi:"); WiFi.begin(WIFI_SSID, WIFI_PASSWORD); while (WiFi.status() != WL_CONNECTED) { Serial.print('.'); delay(500); } Serial.println("\r\n WiFi Connected."); M5.Display.print("Connected."); configTzTime(NTP_TIMEZONE, NTP_SERVER1, NTP_SERVER2, NTP_SERVER3); #if SNTP_ENABLED while (sntp_get_sync_status() != SNTP_SYNC_STATUS_COMPLETED) { Serial.print('.'); delay(1000); }#else delay(1600); struct tm timeInfo; while (!getLocalTime(&timeInfo, 1000)) { Serial.print('.'); };#endif Serial.println("\r\n NTP Connected."); time_t t = time(nullptr) + 1; // Advance one second. while (t > time(nullptr)); /// Synchronization in seconds M5.Rtc.setDateTime(gmtime(&t));} void loop(void){ static constexpr const char* const wd[7] = {"Sun", "Mon", "Tue", "Wed", "Thr", "Fri", "Sat"}; delay(500); auto dt = M5.Rtc.getDateTime(); Serial.printf("RTC UTC :%04d/%02d/%02d (%s) %02d:%02d:%02d\r\n", dt.date.year, dt.date.month, dt.date.date, wd[dt.date.weekDay], dt.time.hours, dt.time.minutes, dt.time.seconds); M5.Display.setCursor(0, 0); M5.Display.printf("RTC UTC :%04d/%02d/%02d (%s) %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. Serial.printf("ESP32 UTC :%04d/%02d/%02d (%s) %02d:%02d:%02d\r\n", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, wd[tm->tm_wday], tm->tm_hour, tm->tm_min, tm->tm_sec); M5.Display.setCursor(0, 20); M5.Display.printf("ESP32 UTC :%04d/%02d/%02d (%s) %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. Serial.printf("ESP32 %s:%04d/%02d/%02d (%s) %02d:%02d:%02d\r\n", 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); M5.Display.setCursor(0, 40); M5.Display.printf("ESP32 %s:%04d/%02d/%02d (%s) %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); }}
The RTC clock part of CoreInk uses the RTC8563_Class
in the M5Unified library. For more related APIs, you can refer to the document below.