STM32-ESP8266 Analytical Weather

Keywords: Mobile JSON network

First: Material preparation

stm32f103vet6, tft color screen, esp8266

II: Preparations for ESP8266

  1. esp8266 uses AT firmware
  2. Configure 8266 as STA mode with serial assistant in advance, connect to wifi, refer to website https://www.cnblogs.com/lifan3a/articles/7070028.html

3: stm32 configuration

  1. Using serial port 3 (PB10,PB11) configuration as follows:
<usart3.c>

//Serial Receive Buffer 	
u8 USART3_RX_BUF[USART3_MAX_RECV_LEN]; 				//Receive buffer, maximum USART3_MAX_RECV_LEN bytes.
u8  USART3_TX_BUF[USART3_MAX_SEND_LEN]; 			//Send buffer, maximum USART3_MAX_SEND_LEN bytes

vu16 USART3_RX_STA=0;   	

void USART3_IRQHandler(void)
{
	u8 res;	      
	if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)//Received data
	{	 
		res =USART_ReceiveData(USART3);		 
		if((USART3_RX_STA&(1<<15))==0)//If a batch of data has not been processed, no other data will be received.
		{ 
			if(USART3_RX_STA<USART3_MAX_RECV_LEN)	//You can also receive data.
			{

				if(USART3_RX_STA==0) 			
				{

				}
				USART3_RX_BUF[USART3_RX_STA++]=res;	//Record the received value	 
			}else 
			{
				USART3_RX_STA|=1<<15;				//Mandatory Markup Receiving Completion
			} 
		}
	}  				 											 
}   

<usart3.h>
#define USART3_MAX_RECV_LEN 1500// Maximum number of received cache bytes
#define USART3_MAX_SEND_LEN 600 // / Maximum number of sending buffer bytes
#define USART3_RX_EN 1//0, not receive; 1, receive.

extern u8  USART3_RX_BUF[USART3_MAX_RECV_LEN]; 		//Receive buffer, maximum USART3_MAX_RECV_LEN bytes
extern u8  USART3_TX_BUF[USART3_MAX_SEND_LEN]; 		//Send buffer, maximum USART3_MAX_SEND_LEN bytes

Send using at command, code as follows

//Weather Connection Port Number: 80	
#define WEATHER_PORTNUM 	"80"
//Weather server IP
#define WEATHER_SERVERIP 	"api.seniverse.com"

//Time Port Number
#define TIME_PORTNUM			"80"
//Time Server IP
#define TIME_SERVERIP			"www.beijing-time.org"


void get_time()
{	
	resp=mymalloc(SRAMIN,10);
	p_end=mymalloc(SRAMIN,40);
	p=mymalloc(SRAMIN,40);							//Request 40 bytes of memory
	sprintf((char*)p,"AT+CIPSTART=\"TCP\",\"%s\",%s",TIME_SERVERIP,TIME_PORTNUM);    //Configure the target TCP server	
	u3_printf("%s\r\n",p); 
	delay_ms(1000); 
	u3_printf("AT+CIPMODE=1\r\n");
	delay_ms(1000); 
	USART3_RX_STA=0;	 
	u3_printf("AT+CIPSEND\r\n");
	delay_ms(1000);

	myfree(SRAMIN,p);        //Free memory
	p=mymalloc(SRAMIN,40);	
	USART3_RX_STA=0;
	USART3_RX_BUF[0]='\0';   //empty
	u3_printf("GET /time15.asp HTTP/1.1\r\nHost:www.beijing-time.org\n\n");
	delay_ms(1000);
	//If (USART3_RX_STA&0X8000) // / At this time, another data is received, which is weather data.
	{ 
		USART3_RX_BUF[USART3_RX_STA&0X7FFF]=0;//Adding an End Character
		resp="Date";
		USART3_RX_BUF[USART3_RX_STA & 0x7ff] = 0;
		//printf("get_tim_srt: %s\r\n",USART3_RX_BUF);
		if(strstr((char*)USART3_RX_BUF,(char*)resp)) 
		{
			resp="GMT";
			p_end = (u8*)strstr((char*)USART3_RX_BUF,(char*)resp);
			p = p_end - 9; 
			//printf("get_net_str %s\r\n",p);
			nwt.hour = ((*p - 0x30)*10 + (*(p+1) - 0x30) + 8) % 24;  //GMT0-->GMT8						  
			nwt.min = ((*(p+3) - 0x30)*10 + (*(p+4) - 0x30)) % 60;						 
			nwt.sec = ((*(p+6) - 0x30)*10 + (*(p+7) - 0x30)) % 60;
			nwt.year = ((*(p-5) - 0x30)*1000 + (*(p-4) - 0x30)*100+ (*(p-3) - 0x30)*10+ (*(p-2) - 0x30)); 
			nwt.date = ((*(p-12) - 0x30)*10 + (*(p-11) - 0x30)); 			
			if        ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Jan")) nwt.month=1; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Feb")) nwt.month=2; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Mar")) nwt.month=3; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Apr")) nwt.month=4; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "May")) nwt.month=5; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Jun")) nwt.month=6; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Jul")) nwt.month=7; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Aug")) nwt.month=8; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Sep")) nwt.month=9; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Oct")) nwt.month=10; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Nov")) nwt.month=11; 
			else if   ((u8*)strstr((char*)USART3_RX_BUF,(char*) "Dec")) nwt.month=12;										 													     
			printf("nwt.year = %d\r\n",nwt.year);
			printf("nwt.month = %d\r\n",nwt.month);
			printf("nwt.date = %d\r\n",nwt.date);  			//Get data 28					
			LCD_ShowxNum(78,50,nwt.year,4,16,0);		
			LCD_ShowChar(112,50,'-',16,0);						
			LCD_ShowxNum(120,50,nwt.month/10,1,16,0);
			LCD_ShowxNum(128,50,nwt.month%10,1,16,0);
			LCD_ShowChar(136,50,'-',16,0);
			LCD_ShowxNum(144,50,nwt.date/10,1,16,0);
			LCD_ShowxNum(152,50,nwt.date%10,1,16,0);		
			printf("nwt.hour = %d\r\n",nwt.hour);
			printf("nwt.min = %d\r\n",nwt.min);
			printf("nwt.sec = %d\r\n",nwt.sec);	
		if(nwt.hour >12)
		{
			nwt.hour = nwt.hour - 12;
			LCD_ShowString(112,70,200,16,16,"PM");
		}
		else
			LCD_ShowString(112,70,200,16,16,"AM");
			
		LCD_ShowxNum(88,90,nwt.hour/10,1,16,0);
		LCD_ShowxNum(96,90,nwt.hour%10,1,16,0);
		LCD_ShowChar(104,90,':',16,0);						
		LCD_ShowxNum(112,90,nwt.min/10,1,16,0);
		LCD_ShowxNum(120,90,nwt.min%10,1,16,0);
		LCD_ShowChar(128,90,':',16,0);
		LCD_ShowxNum(136,90,nwt.sec/10,1,16,0);
		LCD_ShowxNum(144,90,nwt.sec%10,1,16,0);
			//printf("uddate:nettime!!!");			
			myfree(SRAMIN,resp);
			myfree(SRAMIN,p_end);
		}	
	}
	USART3_RX_STA=0;
	USART3_RX_BUF[0]='\0';   //empty
	//Printf ("% s r n", USART3_RX_BUF);// Print BUF data
	u3_printf("+++");        //Withdrawal of Pass-through Mode
	delay_ms(1000);
	myfree(SRAMIN,p);        //Free memory	
	printf("ALL   end ....................\r\n");	   //End of analysis		
}
void get_weather()
{
	printf("ALL   start .......................\r\n");	
	p=mymalloc(SRAMIN,40);							//Request 40 bytes of memory
	sprintf((char*)p,"AT+CIPSTART=\"TCP\",\"%s\",%s",WEATHER_SERVERIP,WEATHER_PORTNUM);    //Configure the target TCP server	
	u3_printf("%s\r\n",p); 
	delay_ms(1000); 
	u3_printf("AT+CIPMODE=1\r\n");
	delay_ms(1000); 
	USART3_RX_STA=0;	 
	u3_printf("AT+CIPSEND\r\n");
	delay_ms(1000);
	USART3_RX_STA=0;
	USART3_RX_BUF[0]='\0';   //empty
	u3_printf("GET https://api.seniverse.com/v3/weather/daily.json?key=pqe1fgv45lrdruq7&location=zhengzhou&language=zh-Hans&unit=c&start=0&days=5\n\n");
	delay_ms(1000);
	if(USART3_RX_STA&0X8000)		//At this point, the data is received again, for the weather data.
	{ 
		USART3_RX_BUF[USART3_RX_STA&0X7FFF]=0;//Adding an End Character
	}
	parse_3days_weather();   //Analysis of weather
	//Printf ("% s r n", USART3_RX_BUF);// Print BUF data
	u3_printf("+++");        //Withdrawal of Pass-through Mode
	delay_ms(1000); 
	myfree(SRAMIN,p);        //Free memory	
	printf("ALL   end ....................\r\n");	   //End of analysis
	
}

JSON data parsing refers to God from the Internet. Readers can learn it systematically.

 

Don't talk too much nonsense.

Disadvantage: AT instruction is used to send the whole process, without checking, and delay method is used.

TCP is not offline monitored

Network time refresh can be as fast as 7 seconds, because it is an at command and needs to be delayed.

The weather is refreshed in 2 minutes

Optimize: Time can use RTC real-time clock to reduce refresh frequency

Source Connection: https://pan.baidu.com/s/1QF3op4RYbnN3e5Vzw6YtLA

Extraction code: g1t5

Posted by zkoneffko on Thu, 31 Jan 2019 09:36:15 -0800

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