Esp8266----- SNTP get network time

Catalog

Preface

user_init

IP Timed callback function

initialization SNTP

SNTP Timing callback function

---

Preface

It introduces 8266 How to get network time

user_init

First of all, will 8266 Set to sta Pattern

void ICACHE_FLASH_ATTR user_init(void)
{
	uart_init(115200,115200);	//  Initialize the serial port baud rate 
	os_delay_us(10000);			//  Wait for the serial port to stabilize 
	os_printf("\r\n=================================================\r\n");
	os_printf("\t Project:\t%s\r\n", ProjectName);
	os_printf("\t SDK version:\t%s", system_get_sdk_version());
	os_printf("\r\n=================================================\r\n");

	// OLED Display initialization 
	//----------------------------------------------------------------
	OLED_Init();								// OLED initialization 
	OLED_ShowString(0,0,"                ");	// Internet Time
	OLED_ShowString(0,2,"Clock =         ");	// Clock： The clock 
	OLED_ShowString(0,4,"Temp  =         ");	// Temperature： temperature 
	OLED_ShowString(0,6,"Humid =         ");	// Humidity： humidity 
	//----------------------------------------------------------------

	LED_Init_JX();		// LED initialization 


	ESP8266_STA_Init_JX();			// ESP8266_STA initialization 

	OS_Timer_IP_Init_JX(1000,1);	// 1 Second repetition timing ( obtain IP Address )
}

IP Timed callback function

If you succeed in obtaining ip Address , So called ESP8266_SNTP_Init_JX();    To initialize the SNTP

// IP Timed callback function 
//=========================================================================================================
void ICACHE_FLASH_ATTR OS_Timer_IP_cb(void)
{
	u8 C_LED_Flash = 0;				// LED Scintillation meter 

	struct ip_info ST_ESP8266_IP;	// ESP8266 Of IP Information 
	u8 ESP8266_IP[4];				// ESP8266 Of IP Address 


	//  Successful access to WIFI【STA In mode , If open DHCP( Default ), be ESO8266 Of IP Address by WIFI Router automatic allocation 】
	//-------------------------------------------------------------------------------------
	if( wifi_station_get_connect_status() == STATION_GOT_IP )	//  Determine whether to obtain IP
	{
		wifi_get_ip_info(STATION_IF,&ST_ESP8266_IP);	//  obtain STA Of IP Information 
		ESP8266_IP[0] = ST_ESP8266_IP.ip.addr;			// IP Eight digits higher than the address  == addr Lower eight 
		ESP8266_IP[1] = ST_ESP8266_IP.ip.addr>>8;		// IP Next highest eight digits of address  == addr Lower eight 
		ESP8266_IP[2] = ST_ESP8266_IP.ip.addr>>16;		// IP Address lower eight digits  == addr Second highest eight 
		ESP8266_IP[3] = ST_ESP8266_IP.ip.addr>>24;		// IP Lower eight digits of address  == addr Top eight digit 

		//  Show ESP8266 Of IP Address 
		//------------------------------------------------------------------------------------------------
		//os_printf("\nESP8266_IP = %d.%d.%d.%d\n",ESP8266_IP[0],ESP8266_IP[1],ESP8266_IP[2],ESP8266_IP[3]);
		//OLED_ShowIP(24,2,ESP8266_IP);	// OLED Show ESP8266 Of IP Address 
		//------------------------------------------------------------------------------------------------

		//  Access WIFI After success ,LED Flash 3 Time 
		//----------------------------------------------------
		for(; C_LED_Flash<=5; C_LED_Flash++)
		{
			GPIO_OUTPUT_SET(GPIO_ID_PIN(4),(C_LED_Flash%2));
			delay_ms(100);
		}

		os_timer_disarm(&OS_Timer_IP);	//  off timer 

		ESP8266_SNTP_Init_JX();			//  initialization SNTP
	}
}

initialization SNTP

8266 It supports setting up to three SNTP The server , among SNTP0 Is the primary server , The remaining two are standby servers

We can call these two API To set up SNTP The server , Parameter one is SNTP The priority of the server

sntp_setservername(0, "us.pool.ntp.org");    // The server _0【 domain name 】 The second parameter is SNTP Domain name of
sntp_setserver(2, addr);                    // The server _2【IP Address 】 The second parameter is SNTP Server's 32 Bit binary IP Address

So it's using sntp_setserver(2, addr); Use before ipaddr_aton("210.72.145.44", addr); To divide dots into decimal strings ip Address conversion to 32 Binary of bit ip Address , As sntp_setserver(2, addr); Parameters of

Then call sntp_init();  SNTP initialization API

To set up OS_Timer_SNTP_Init_JX(1000,1);  1 Second repetition timing (SNTP)

//  initialization SNTP
//=============================================================================
void ICACHE_FLASH_ATTR ESP8266_SNTP_Init_JX(void)
{
	ip_addr_t * addr = (ip_addr_t *)os_zalloc(sizeof(ip_addr_t));

	sntp_setservername(0, "us.pool.ntp.org");	//  The server _0【 domain name 】
	sntp_setservername(1, "ntp.sjtu.edu.cn");	//  The server _1【 domain name 】

	ipaddr_aton("210.72.145.44", addr);			//  dotted decimal  => 32 Bit binary 
	sntp_setserver(2, addr);					//  The server _2【IP Address 】
	os_free(addr);								//  Release addr

	sntp_init();	// SNTP initialization API

	OS_Timer_SNTP_Init_JX(1000,1);				// 1 Second repetition timing (SNTP)
}

SNTP Timing callback function

call sntp_get_current_timestamp(); To query the current distance from the reference time (1970.01.01 00:00:00 GMT+8) The timestamp ( Company : second )  The base time is 1970 year 1 month 1 Number 0 when 0 branch 0 Second East 8 District

If TimeStamp This timestamp is not equal to 0, Just explain SNTP Get network time successfully .

call sntp_get_real_time(TimeStamp); Its parameter is the timestamp from the reference time , To get the current real time .

Then the serial port prints the timestamp , The actual time of serial port printing

According to the obtained time, we can calculate the time we need , date , The value of time is oled Show , also oled Display the read temperature and humidity data

// SNTP Timing callback function 
//===================================================================================================
void ICACHE_FLASH_ATTR OS_Timer_SNTP_cb(void	 * arg)
{
	//  String collation   Related variables 
	//------------------------------------------------------

	u8 C_Str = 0;				//  String byte count 

	char A_Str_Data[20] = {0};	// 【" date "】 Array of strings 

	char *T_A_Str_Data = A_Str_Data;	//  Cache array pointer 

	char A_Str_Clock[10] = {0};	// 【" Time "】 Array of strings 


	char * Str_Head_Week;		// 【" week "】 String first address 

	char * Str_Head_Month;		// 【" month "】 String first address 

	char * Str_Head_Day;		// 【" days "】 String first address 

	char * Str_Head_Clock;		// 【" The clock "】 String first address 

	char * Str_Head_Year;		// 【" year "】 String first address 

	//------------------------------------------------------


	 uint32	TimeStamp;		//  Time stamp 

	 char * Str_RealTime;	//  String of actual time 


	 //  Query the current distance from the reference time (1970.01.01 00:00:00 GMT+8) The timestamp ( Company : second )
	 //-----------------------------------------------------------------
	 TimeStamp = sntp_get_current_timestamp();

	 if(TimeStamp)		//  Determine whether the offset time is obtained 
	 {
		 //os_timer_disarm(&OS_Timer_SNTP);	//  close SNTP Timer 

		 //  Query actual time (GMT+8): East eight ( Beijing time. )
		 //--------------------------------------------
		 Str_RealTime = sntp_get_real_time(TimeStamp);


		 // 【 The actual time 】 character string  == " Zhou   month   Japan   when : branch : second   year "
		 //------------------------------------------------------------------------
		 os_printf("\r\n----------------------------------------------------\r\n");
		 os_printf("SNTP_TimeStamp = %d\r\n",TimeStamp);		//  Time stamp 
		 os_printf("\r\nSNTP_InternetTime = %s",Str_RealTime);	//  The actual time 
		 os_printf("--------------------------------------------------------\r\n");


		 //  Time string collation ,OLED Show 【" date "】、【" Time "】 character string 
		 //…………………………………………………………………………………………………………………

		 // 【" year " + ' '】 Fill in the date array 
		 //---------------------------------------------------------------------------------
		 Str_Head_Year = Str_RealTime;	//  Set the starting address 

		 while( *Str_Head_Year )		//  find 【" The actual time "】 The end character of the string '\0'
			 Str_Head_Year ++ ;

		 // 【 notes ：API The actual time string returned , Finally, there is a line break , So here  -5】
		 //-----------------------------------------------------------------
		 Str_Head_Year -= 5 ;			//  obtain 【" year "】 The first address of the string 

		 T_A_Str_Data[4] = ' ' ;
		 os_memcpy(T_A_Str_Data, Str_Head_Year, 4);		// 【" year " + ' '】 Fill in the date array 

		 T_A_Str_Data += 5;				//  Point to 【" year " + ' '】 The address after the string 
		 //---------------------------------------------------------------------------------

		 //  obtain 【 date 】 The first address of the string 
		 //---------------------------------------------------------------------------------
		 Str_Head_Week 	= Str_RealTime;							// " week "  The first address of the string 
		 Str_Head_Month = os_strstr(Str_Head_Week,	" ") + 1;	// " month "  The first address of the string 
		 Str_Head_Day 	= os_strstr(Str_Head_Month,	" ") + 1;	// " days "  The first address of the string 
		 Str_Head_Clock = os_strstr(Str_Head_Day,	" ") + 1;	// " The clock "  The first address of the string 


		 // 【" month " + ' '】 Fill in the date array 
		 //---------------------------------------------------------------------------------
		 C_Str = Str_Head_Day - Str_Head_Month;				// 【" month " + ' '】 Bytes of 

		 os_memcpy(T_A_Str_Data, Str_Head_Month, C_Str);	// 【" month " + ' '】 Fill in the date array 

		 T_A_Str_Data += C_Str;		//  Point to 【" month " + ' '】 The address after the string 


		 // 【" days " + ' '】 Fill in the date array 
		 //---------------------------------------------------------------------------------
		 C_Str = Str_Head_Clock - Str_Head_Day;				// 【" days " + ' '】 Bytes of 

		 os_memcpy(T_A_Str_Data, Str_Head_Day, C_Str);		// 【" days " + ' '】 Fill in the date array 

		 T_A_Str_Data += C_Str;		//  Point to 【" days " + ' '】 The address after the string 


		 // 【" week " + ' '】 Fill in the date array 
		 //---------------------------------------------------------------------------------
		 C_Str = Str_Head_Month - Str_Head_Week - 1;		// 【" week "】 Bytes of 

		 os_memcpy(T_A_Str_Data, Str_Head_Week, C_Str);		// 【" week "】 Fill in the date array 

		 T_A_Str_Data += C_Str;		//  Point to 【" week "】 The address after the string 


		 // OLED Show 【" date "】、【" The clock "】 character string 
		 //---------------------------------------------------------------------------------
		 *T_A_Str_Data = '\0';		// 【" date "】 Add... After the string '\0'

		 OLED_ShowString(0,0,A_Str_Data);		// OLED Show date 


		 os_memcpy(A_Str_Clock, Str_Head_Clock, 8);		// 【" The clock "】 String into the clock array 
		 A_Str_Clock[8] = '\0';

		 OLED_ShowString(64,2,A_Str_Clock);		// OLED Display time 

		 //…………………………………………………………………………………………………………………
	 }

	//  Every time 5 second , Read / Display temperature and humidity data 
	//-----------------------------------------------------------------------------------------
	C_Read_DHT11 ++ ;		//  Read DHT11 timing 

	if(C_Read_DHT11>=5)		// 5 Second timing 
	{
		C_Read_DHT11 = 0;	//  timing =0

		if(DHT11_Read_Data_Complete() == 0)		//  Read DHT11 Temperature and humidity 
		{
			DHT11_NUM_Char();	// DHT11 The data value is converted into a string 

			OLED_ShowString(64,4,DHT11_Data_Char[1]);	// DHT11_Data_Char[0] == 【 Temperature string 】
			OLED_ShowString(64,6,DHT11_Data_Char[0]);	// DHT11_Data_Char[1] == 【 Humidity string 】
		}

		else
		{
			OLED_ShowString(64,4,"----");	// Temperature： temperature 
			OLED_ShowString(64,6,"----");	// Humidity： humidity 
		}
	}
	//-----------------------------------------------------------------------------------------
}

 

You can see 8266 The timestamp from the benchmark time has been successfully obtained , And according to this timestamp, the current actual time is successfully obtained  Sun Jul 24 19:14:22 2022 It is consistent with the computer system time , This means that 8266 adopt SNTP Successfully obtained the network time , stay olde I've been walking for last second , It shows that it keeps getting accurate network time .