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。文章来源：https://www.toymoban.com/news/detail-743274.html
#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。文章来源地址https://www.toymoban.com/news/detail-743274.html
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