XIAO-ESP32-C3で作る WiFi置時計のプログラム

 #include <Arduino.h>

#include <TM1637Display.h>

#include <WiFi.h>

#include <esp_sntp.h>  //for sntp_sync_status

#define CLK D7// #include <TM1637Display.h>

#define DIO D10

//#define LED_PIN   10

//#define BUTTON_PIN 18

//#define MODE_PIN 14

// put function declarations here:

//const int led = D10; // there is no LED_BUILTIN available for the XIAO ESP32C3.

const char* ssid     = "**********";

const char* password = "**********";

const char* ntpServer1 = "ntp.nict.jp";

const char* ntpServer2 = "time.google.com";

const char* ntpServer3 = "ntp.jst.mfeed.ad.jp";

const long  gmtOffset_sec = 9 * 3600;

const int   daylightOffset_sec = 0;

bool timeset = 0;

hw_timer_t * timer = NULL;

volatile SemaphoreHandle_t timerSemaphore;

portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;

struct tm timeInfo;

// 現在時刻表示

void showLocalTime()

{

  char str[256];

  static const char *wd[7] = { "日", "月", "火", "水", "木", "金", "土" };

  unsigned long m;

  // getLocalTimeを使用して現在時刻取得

  m = millis();

  getLocalTime(&timeInfo);  

  sprintf(str, "[getLocalTime  ] %04d/%02d/%02d(%s) %02d:%02d:%02d : %d (ms)", timeInfo.tm_year+1900, timeInfo.tm_mon+1, timeInfo.tm_mday, wd[timeInfo.tm_wday], timeInfo.tm_hour, timeInfo.tm_min, timeInfo.tm_sec, millis()-m);

  Serial.println(str);

}

void timeavailable(struct timeval *t)

{

  Serial.println("Got time adjustment from NTP!");

  timeset = 1;

}

void ARDUINO_ISR_ATTR onTimer(){

  // Give a semaphore that we can check in the loop

  xSemaphoreGiveFromISR(timerSemaphore, NULL);

  // It is safe to use digitalRead/Write here if you want to toggle an output

}

TM1637Display display(CLK, DIO);

void setup() {

  // initialize digital pin led as an output

  //pinMode(led, OUTPUT);

  Serial.begin(115200);

  delay(100);

  Serial.printf("%s - run\n",__func__);

  //pinMode(LED_PIN, OUTPUT);

  // Wifi接続処理

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

      delay(500);

      Serial.print(".");

  }

  // NTP

  sntp_set_time_sync_notification_cb( timeavailable );

  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer1, ntpServer2, ntpServer3);

  // 時刻設定後の時刻取得

  while( !timeset ) {

    delay(1000);

  }

  Serial.println("<<時刻設定後の時刻取得>>");

  for(int i=0;i<1;i++) {

    showLocalTime();

    delay(1000);

  }

  //lastIsrAt = millis();

  //resetTime = lastIsrAt;

  // Create semaphore to inform us when the timer has fired

  timerSemaphore = xSemaphoreCreateBinary();

  // Use 1st timer of 4 (counted from zero).

  // Set 80 divider for prescaler (see ESP32 Technical Reference Manual for more

  // info).

  timer = timerBegin(0, 80, true);

  // Attach onTimer function to our timer.

  timerAttachInterrupt(timer, &onTimer, true);

  // Set alarm to call onTimer function every second (value in microseconds).

  // Repeat the alarm (third parameter)

  timerAlarmWrite(timer, 1000000, true);

  // Start an alarm

  timerAlarmEnable(timer);

  display.setBrightness(0x0f);

}

void loop() {

  // put your main code here, to run repeatedly:

  uint32_t countsec;

  uint32_t countmin;

  uint32_t counthour;

  uint8_t sec;

  uint8_t min;

  uint8_t hour;

  if (xSemaphoreTake(timerSemaphore, 0) == pdTRUE){

    // Read the interrupt count and time

    //tm.tm_hour, tm.tm_min, tm.tm_sec

    getLocalTime(&timeInfo);  

    display.showNumberDecEx((timeInfo.tm_hour*100)+timeInfo.tm_min, (0x80 >> 1), true); //Hour:Min  

    //showLocalTime();

  }

}

// put function definitions here: