ESP8266获取网络时间 实时时钟

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程序现象

 

一、用串口调试助手调试

1.发送指令AT+RST重启模块使应用模式更改生效；

2.发送指令ATE0取消回显

3.使用串口发送指令AT+CWMODE=1设置模块Wi-Fi应用模式为Station模式；

4.发送指令AT+CWJAP ="ssid","pwd"连接AP；

5.发送指令AT+CIPMUX=0设置模块为单路连接模式，模块默认为单路连接模式；

6.发送指令AT+CIPSTART="TCP","api.k780.com",80 与服务器建立TCP连接 ;

7.发送指令AT+CIPMODE=1设置模块传输模式为透传模式；

8.发送指令AT+CIPSEND开启透传模式向服务器发送数据，模块收到此指令后先换行后返回“>”

9.剩下只需要发送 GET http://api.k780.com:88/?app=life.time&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json&HTTP/1.1\r\n，就能获取到年月时间。      （调用一个网络API接口，这个接口会返回标准网络时间）

 可以看到发送完第九条指令后会收到如上图，所以整体思路：用串口进行通信，发送AT指令，获取到的数据存在Buf中，然后对Buf中的数据解析。获取timestamp后为时间戳，获取datetime_1后为日期时间。

USART串口模块

这一部分的初始化和之前一样，串口接收部分要进行判断如果接收到 '>' ，用Flag标记表示后面调用API后会收到时间戳和时间等数据。

#include "stm32f10x.h"                  // Device header#include "MyUSART.h"#include "esp.h"#include <string.h>char Buf[512];unsigned char i;uint8_t Flag;void MyUSART_Init(void){RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 ,ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA ,ENABLE);GPIO_InitTypeDef GPIO_InitStructure;                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);USART_InitTypeDef USART_InitStructure;              USART_InitStructure.USART_BaudRate = 115200;USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None;USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;USART_InitStructure.USART_Parity =USART_Parity_No ;USART_InitStructure.USART_StopBits = USART_StopBits_1;USART_InitStructure.USART_WordLength = USART_WordLength_8b;USART_Init (USART1,&USART_InitStructure);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);NVIC_InitTypeDef NVIC_InitStructure;NVIC_InitStructure.NVIC_IRQChannel =USART1_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_Init(&NVIC_InitStructure);USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);USART_Cmd(USART1,ENABLE);}void MyUSART_SendString(char* str){uint8_t stri=0;while(str[stri] != '\0')USART_SendData (USART1,str[stri++]);}void USART1_IRQHandler(){if(USART_GetITStatus(USART1,USART_IT_RXNE)){Buf[i++]=USART_ReceiveData(USART1);if(Buf[i-1] == '>'){Flag=1;}else if((Buf[i-2]=='\r')&&(Buf[i-1]=='\n'))  {Buf[i-2]='\0';i = 0;}USART_ClearITPendingBit(USART1,USART_IT_RXNE);}}

ESP8266WIFI模块

这一部分初始化操作发送AT指令，在主函数中根据返回的数字可以判断哪里有问题

Comman_Rec（）这个函数用来处理Buf中接收到的数据。

#include "stm32f10x.h"                  // Device header#include "MyUSART.h"#include <stdio.h>#include <string.h>#include "Delay.h"#include "OLED.H"#include <stdlib.h>extern char Buf[512];const char* WIFI ="GT";const char* PASS="123456789";extern uint8_t Flag;uint32_t timestamp_cnt;char subdatetime_1[11]; char subdatetime_2[8];uint32_t temp = 2;int fputc(int ch,FILE *f )   //printf重定向  {USART_SendData(USART1,(uint8_t)ch);while(USART_GetFlagStatus (USART1,USART_FLAG_TC) == RESET);return ch;}char esp_Init(void){memset(Buf,0,sizeof(Buf));printf("AT+RST\r\n");Delay_ms(2000);memset(Buf,0,sizeof(Buf));printf("ATE0\r\n");    //关闭回显memset(Buf,0,sizeof(Buf));Delay_ms(1000);if(strcmp(Buf,"OK")!=0 )return 1;memset(Buf,0,sizeof(Buf));printf("AT+CWMODE=1\r\n");Delay_ms(50);if(strcmp(Buf,"OK")!=0)return 2;memset(Buf,0,sizeof(Buf));printf("AT+CWJAP=\"%s\",\"%s\"\r\n",WIFI,PASS); //连接热点Delay_ms(1000);if(strcmp(Buf,"OK")!=0)return 3;memset(Buf,0,sizeof(Buf));printf("AT+CIPMUX=0\r\n");Delay_ms(500);if(strcmp(Buf,"OK")!=0)return 4;memset(Buf,0,sizeof(Buf));printf("AT+CIPSTART=\"TCP\",\"api.k780.com\",80\r\n");Delay_ms(500);if(strcmp(Buf,"OK")!=0)return 5;memset(Buf,0,sizeof(Buf));printf("AT+CIPMODE=1\r\n");Delay_ms(500);if(strcmp(Buf,"OK")!=0)return 6;memset(Buf,0,sizeof(Buf));printf("AT+CIPSEND\r\n");Delay_ms(500);if(Flag != 1)return 7;return 0;}void ESP_Pub(void)        //当接收到'>'时{if(Flag == 1){printf("GET http://api.k780.com:88/?app=life.time&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json&HTTP/1.1\r\n");Delay_ms(2000);}}void Comman_Rec(void){    char *timestamp_start = strstr(Buf,"timestamp"); // 定位到"timestamp"字段的起始位置if (timestamp_start != NULL) {timestamp_start += (strlen("timestamp")+3); // 跳过"timestamp"char timestamp[11];strncpy(timestamp, timestamp_start, 10); // 复制10个字符到timestamp数组timestamp[10] = '\0'; // 添加字符串结束符timestamp_cnt =atoi(timestamp);//转换为整数}char *datetime1_start = strstr(Buf,"datetime_1"); if (datetime1_start != NULL) {datetime1_start += (strlen("datetime_1")+3); strncpy(subdatetime_1, datetime1_start, 10); subdatetime_1[10] = '\0'; strncpy(subdatetime_2, datetime1_start+11, 7); subdatetime_2[7] = '\0'; }}

主函数

#include "stm32f10x.h"                  // Device header#include "OLED.H"#include <stdio.h>#include "Delay.h"#include "MyUSART.H" #include "esp.h"extern char Buf[512];extern uint8_t Flag;extern uint32_t timestamp_cnt;extern char subdatetime_1[11];extern char subdatetime_2[9];void Init(void){uint8_t Judge=0;OLED_Init();OLED_ShowString(1,1,"Linking..");Delay_ms(100);MyUSART_Init(); do{Judge = esp_Init();OLED_ShowString(1,1,"code:    ");OLED_ShowNum(2,1,Judge,1);}while(Judge!=0);  }int main(void){Init();if(Flag==1){OLED_ShowString(1,1,"SUCCESS");}else{OLED_ShowString(1,1,"FAIL");}while(1){ESP_Pub();Comman_Rec();OLED_ShowNum(1,1,timestamp_cnt,10);OLED_ShowString(2,1,subdatetime_1);OLED_ShowString(3,1,subdatetime_2);}}

注意：这个代码存在的问题是比标准的北京时间慢两秒，因为每次调用网络API接口都会Delay2秒，所以可以只获取时间戳，加上两秒后再根据网上的代码将时间戳转换为具体的时间格式。还可以根据上一节实时时钟的代码实现掉电不丢失的功能。而且有时候显示一会会跳变一下，也有很多问题，我在网上没找到stm32库函数的这个功能实现，还没找到更好的思路。

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