WIFI模块（esp-01s）实现天气预报代码实现

目录

前言

实现图片

一、串口编程的实现

二、发送AT指令

esp01s.c

esp01s.h

三、数据处理

1、初始化

2、cjson处理函数

3、核心控制代码 

四、修改堆栈大小

---

前言

实现图片

 前面讲解了使用AT指令获取天气与cjson的解析数据，本章综合将时间显示到屏幕

一、串口编程的实现

uint8_t rx_dat;
char rxdata[1000];
int rx_p = 0,rx_ppre = 0;

 

int fputc(int ch,FILE *f)
{
  //采用轮询方式发送1字节数据，超时时间设置为无限等待
  
  HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,HAL_MAX_DELAY);
  
  return ch;
}
int fgetc(FILE *f)
{
  uint8_t ch;
  // 采用轮询方式接收 1字节数据，超时时间设置为无限等待
  HAL_UART_Receive( &huart1,(uint8_t*)&ch,1, HAL_MAX_DELAY );
  return ch;
}

// 串口中断接收数据
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	if(huart->Instance == USART1)
	{
        
        // if(rx_p >= sizeof(rxdata))  rx_p = 0;       //防止串口被刷爆
        rxdata[rx_p ++] = rx_dat;
		HAL_UART_Receive_IT(&huart1,&rx_dat,1);
	}
}

二、发送AT指令

esp01s.c

#include "esp01s.h"
#include "usart.h"

uint8_t rx_dat;
char rxdata[1000];
int rx_p = 0,rx_ppre = 0;

unsigned char Time_buff[1000];

int fputc(int ch,FILE *f)
{
  //采用轮询方式发送1字节数据，超时时间设置为无限等待
  
  HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,HAL_MAX_DELAY);
  
  return ch;
}
int fgetc(FILE *f)
{
  uint8_t ch;
  // 采用轮询方式接收 1字节数据，超时时间设置为无限等待
  HAL_UART_Receive( &huart1,(uint8_t*)&ch,1, HAL_MAX_DELAY );
  return ch;
}

// 串口中断接收数据
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	if(huart->Instance == USART1)
	{
        
        // if(rx_p >= sizeof(rxdata))  rx_p = 0;       //防止串口被刷爆
        rxdata[rx_p ++] = rx_dat;
		HAL_UART_Receive_IT(&huart1,&rx_dat,1);
	}
}


//清空缓存
void esp01s_clear(void)
{
    memset(rxdata,0,sizeof(rxdata));
    rx_p = 0;
}

//esp01s等待接收完成 0成功 1失败
int esp01s_waitrecive(void)
{
    if(rx_p == 0) 							//如果接收计数为0 则说明没有处于接收数据中，所以直接跳出，结束函数
        return 1;
 
    if(rx_p == rx_ppre)				//如果上一次的值和这次相同，则说明接收完毕
    {
        rx_p = 0;							//清0接收计数
 
        return 0;								//返回接收完成标志
    }
 
    rx_ppre = rx_p;					//置为相同
 
    return 1;								//返回接收未完成标志
}

//esp01s发送指令   0成功 1失败
int esp01s_sendcmd(char *cmd,char *res)
{
    unsigned char timeout = 250;

    printf(cmd);
    while(timeout --)
    {
        if(esp01s_waitrecive() == 0)            //如果收到数据
        {
            if(strstr(rxdata,res) != NULL)      //如果检索到关键词
            {
                esp01s_clear();
                return 0;
            }
        }
        HAL_Delay(10);
    }
    return 1;
}

//esp01s发送数据
void esp01s_senddata(char *data)
{
    esp01s_clear();								//清空接收缓存

    if(!esp01s_sendcmd("AT+CIPSEND\r\n",">"))				//收到‘>’时可以发送数据
    //printf(data);
    {
        /*发送请求数据*/
        printf(data);               	//发送设备连接请求数据
    }

}

unsigned char *ESP8266_GetIPD_GET(unsigned short timeOut, uint8_t *buff) //这里我用了一个全局变量将esp8266buf储存到这个全局变量里面
{
    do
    {
        HAL_Delay(5);
    }
    while(timeOut--);
 
    strcpy((char*)buff, (char*)rxdata);
    return buff;
}

esp01s.h

#ifndef __ESP01S_H
#define __ESP01S_H

#include "main.h"
#include "string.h"
#include "stdio.h"

extern uint8_t rx_dat;
extern char rxdata[1000];
extern int rx_p,rx_ppre;
extern unsigned char Time_buff[1000];

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart);
void esp01s_clear(void);
int esp01s_waitrecive(void);
int esp01s_sendcmd(char *cmd,char *res);
void esp01s_senddata(char *data);
unsigned char *ESP8266_GetIPD_GET(unsigned short timeOut, uint8_t *buff);

#endif 

三、数据处理

1、初始化

esp01s_clear();
  while(esp01s_sendcmd("+++",""));
  while(esp01s_sendcmd("AT\r\n", "OK"));
  while(esp01s_sendcmd("AT+RST\r\n", "OK"));
  while(esp01s_sendcmd("AT+CWMODE=1\r\n", "OK"));
  while(esp01s_sendcmd("AT+CIPMUX=0\r\n", "OK"));
  while(esp01s_sendcmd("AT+CWJAP=\"meng\",\"20010131\"\r\n", "WIFI GOT IP"));
  while(esp01s_sendcmd("AT+CIPSTART=\"TCP\",\"api.seniverse.com\",80\r\n","CONNECT"));
  // while(esp01s_sendcmd("AT+CIPSTART=\"TCP\",\"api.pinduoduo.com\",80\r\n","CONNECT"));
  while(esp01s_sendcmd("AT+CIPMODE=1\r\n", "OK"));

  HAL_GPIO_WritePin(led_blue_GPIO_Port,led_blue_Pin,GPIO_PIN_RESET);

2、cjson处理函数

int test2_jiexi()
{
  char *data;
  cJSON *json=NULL,*arrayItem=NULL,*object=NULL,*subobject=NULL,*nowobject=NULL,*mingobject=NULL,*houobject=NULL,*nowtext=NULL,*nowhigh=NULL,*nowlow=NULL,*mingtext=NULL,*minghigh=NULL,*minglow=NULL,*houtext=NULL,*houhigh=NULL,*houlow=NULL;
  cJSON *nowdate = NULL,*mingdate = NULL,*houdate = NULL;
  data = (char*)te;
  json = cJSON_Parse(data);    //解析数据包
  // if(json == NULL)                           //解析失败
  // {
  //   sprintf(text,"Error:%s",cJSON_GetErrorPtr());
  //   lcd_showstr(0,0,(uint8 *)text,WHITE);
  //   return 1;
  // }
  if(json)
  { 
    HAL_GPIO_WritePin(led_red_GPIO_Port,led_red_Pin,GPIO_PIN_RESET);
    if((arrayItem = cJSON_GetObjectItem(json,"results")) != NULL)     //匹配字符串results，获取数组内容
    {
      HAL_GPIO_WritePin(led_red_GPIO_Port,led_red_Pin,GPIO_PIN_RESET);
      int size = cJSON_GetArraySize(arrayItem);
      // sprintf(text,"size is %d",size);
      // lcd_showstr(0,0,(uint8 *)text,WHITE);
      if((object = cJSON_GetArrayItem(arrayItem,0)) != NULL)         //results第0位
      {
        //if((subobject = cJSON_GetObjectItem(object,"location")) != NULL);   //位置信息
        if((subobject = cJSON_GetObjectItem(object,"daily")) != NULL)      //天气信息
        {
          int tianqi_size = cJSON_GetArraySize(subobject);
          // sprintf(text,"size is %d",tianqi_size);
          // lcd_showstr(0,1,(uint8 *)text,WHITE);
          if((nowobject = cJSON_GetArrayItem(subobject,0)) != NULL)        //今天
          {
            nowtext = cJSON_GetObjectItem(nowobject,"text_day");            //天气状况
            nowhigh = cJSON_GetObjectItem(nowobject,"high");                //高温
            nowlow = cJSON_GetObjectItem(nowobject,"low");                  //低温
            nowdate = cJSON_GetObjectItem(nowobject,"date");                //日期

            sprintf(text,"%s:",nowdate->valuestring);
            lcd_showstr(0,0,(uint8 *)text,WHITE);
            sprintf(text,"%s %sC/%sC",nowtext->valuestring,nowhigh->valuestring,nowlow->valuestring);
            lcd_showstr(20,1,(uint8 *)text,WHITE);
          }
          if((mingobject = cJSON_GetArrayItem(subobject,1)) != NULL)        //明天
          {
            mingtext = cJSON_GetObjectItem(mingobject,"text_day");            //天气状况
            minghigh = cJSON_GetObjectItem(mingobject,"high");                //高温
            minglow = cJSON_GetObjectItem(mingobject,"low");                  //低温
            mingdate = cJSON_GetObjectItem(mingobject,"date");                //日期

            sprintf(text,"%s:",mingdate->valuestring);
            lcd_showstr(0,3,(uint8 *)text,WHITE);
            sprintf(text,"%s %sC/%sC",mingtext->valuestring,minghigh->valuestring,minglow->valuestring);
            lcd_showstr(20,4,(uint8 *)text,WHITE);
          }
          if((houobject = cJSON_GetArrayItem(subobject,2)) != NULL)        //后天
          {
            houtext = cJSON_GetObjectItem(houobject,"text_day");            //天气状况
            houhigh = cJSON_GetObjectItem(houobject,"high");                //高温
            houlow = cJSON_GetObjectItem(houobject,"low");                  //低温
            houdate = cJSON_GetObjectItem(houobject,"date");                //日期

            sprintf(text,"%s:",houdate->valuestring);
            lcd_showstr(0,6,(uint8 *)text,WHITE);
            sprintf(text,"%s %sC/%sC",houtext->valuestring,houhigh->valuestring,houlow->valuestring);
            lcd_showstr(20,7,(uint8 *)text,WHITE);
          }
        }
        //if((subobject = cJSON_GetObjectItem(object,"last_update")) != NULL);      //更新信息
      }
    }
    
  } 
  cJSON_Delete(json);
  return 0;
}

3、核心控制代码 

u8g2_ClearBuffer(&u8g2);
    if(key[0].single_flag == 1)
    {
      key[0].single_flag = 0;
      // esp01s_senddata("GET http://api.pinduoduo.com/api/server/_stm\r\n");
      esp01s_senddata("GET https://api.seniverse.com/v3/weather/daily.json?key=S6H95GCCwULqmbSE8&location=weifang&language=en&unit=c&start=-1&days=4\r\n");
      
      te = ESP8266_GetIPD_GET(200, Time_buff); //将串口数据取出来

      esp01s_clear();//清除缓存数据
      HAL_Delay(500);
      while(esp01s_sendcmd("+++", ""));      /*退出透传模式，发送两次*/
      HAL_GPIO_WritePin(led_blue_GPIO_Port,led_blue_Pin,GPIO_PIN_SET);
    }
    
    // int num1 = strlen((char*) te);
    // sprintf(text,"%d",num1);
    // lcd_showstr(0,7,(uint8 *)text,WHITE);
    test2_jiexi();
    u8g2_SendBuffer(&u8g2);
    // lcd_clear(BLACK);

四、修改堆栈大小

在json处理长字符串时，需要修改堆栈大小（卡了好长时间）

将 Stack_Size与Heap_Size改大，程序正常运行

有需要的可以联系我，给工程代码