keil5 stm32f407ve芯片利用esp8266模块连接知心天气获取天气信息的代码

以下是基于Keil5和STM32F407VE芯片利用ESP8266模块连接知心天气获取天气信息的代码：

#include "stm32f4xx.h"
#include <stdio.h>
#include <string.h>

#define SSID "Your_SSID" // 请替换成自己的WiFi名称
#define PASSWORD "Your_Password" // 请替换成自己的WiFi密码

void USART3_Configuration(void);
void USART3_SendChar(uint16_t Data);
void USART3_SendString(char *str);
void ESP8266_Configuration(void);
void ESP8266_SendCommand(char *cmd);
char ESP8266_ReceiveChar(void);
void ESP8266_ReceiveResponse(char *response);
void ESP8266_ClearBuffer(void);
void Delay_ms(uint32_t nCount);

int main(void)
{
    char response[200];
    char cmd[100];
    char temp[10], weather[20]; // 存放温度和天气
    uint8_t i;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

    USART3_Configuration();
    ESP8266_Configuration();

    // 连接WiFi
    sprintf(cmd, "AT+CWJAP=\"%s\",\"%s\"\r\n", SSID, PASSWORD);
    ESP8266_SendCommand(cmd);
    ESP8266_ClearBuffer();

    // 获取天气信息
    ESP8266_SendCommand("AT+CIPSTART=\"TCP\",\"www.zxweather.com\",80\r\n");
    ESP8266_ClearBuffer();
    Delay_ms(1000);

    sprintf(cmd, "GET /WeatherAPI/weather.aspx?city=beijing HTTP/1.1\r\nHost: www.zxweather.com\r\n\r\n");
    sprintf(temp, "Content-Length: %d\r\n", strlen(cmd));
    sprintf(cmd, "AT+CIPSEND=%d\r\n", strlen(cmd) + strlen(temp) + 2);
    ESP8266_SendCommand(cmd);
    ESP8266_ClearBuffer();
    Delay_ms(1000);

    ESP8266_SendCommand(temp);
    ESP8266_SendString(cmd);
    ESP8266_SendString("\r\n");

    ESP8266_ClearBuffer();
    Delay_ms(1000);

    ESP8266_ReceiveResponse(response);

    for (i = 0; i < strlen(response); i++)
    {
        if (response[i] == '\"')
        {
            i++;
            break;
        }
    }

    strncpy(temp, response + i, 4); // 获取温度
    temp[4] = '\0';
    strncpy(weather, response + i + 6, 8); // 获取天气
    weather[8] = '\0';

    USART3_SendString("Temperature: ");
    USART3_SendString(temp);
    USART3_SendString("\r\n");

    USART3_SendString("Weather: ");
    USART3_SendString(weather);
    USART3_SendString("\r\n");

    while (1);
}

void USART3_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_USART3);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_USART3);

    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_Init(USART3, &USART_InitStructure);

    USART_Cmd(USART3, ENABLE);
}

void USART3_SendChar(uint16_t Data)
{
    while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);
    USART_SendData(USART3, (uint8_t)Data);
}

void USART3_SendString(char *str)
{
    while (*str)
    {
        USART3_SendChar(*str++);
    }
}

void ESP8266_Configuration(void)
{
    char response[100];

    ESP8266_SendCommand("AT+RST\r\n");
    ESP8266_ClearBuffer();
    Delay_ms(3000);

    ESP8266_SendCommand("AT+CWMODE=1\r\n");
    ESP8266_ClearBuffer();

    ESP8266_SendCommand("AT+CIPMUX=0\r\n");
    ESP8266_ClearBuffer();
}

void ESP8266_SendCommand(char *cmd)
{
    while (*cmd)
    {
        USART3_SendChar(*cmd++);
    }
}

char ESP8266_ReceiveChar(void)
{
    while (USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET);
    return (char)USART_ReceiveData(USART3);
}

void ESP8266_ReceiveResponse(char *response)
{
    uint8_t i = 0;
    char c;

    while (i < 200)
    {
        c = ESP8266_ReceiveChar();
        response[i++] = c;
        if (c == '\n')
        {
            break;
        }
    }
    response[i] = '\0';
}

void ESP8266_ClearBuffer(void)
{
    char c;
    while (USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == SET)
    {
        c = USART_ReceiveData(USART3);
    }
}

void Delay_ms(uint32_t nCount)
{
    uint32_t i, j;
    for (i = 0; i < nCount; i++)
    {
        for (j = 0; j < 2000; j++);
    }
}

注意：在使用该代码之前，请先在ESP8266模块上烧录AT固件。并且请替换代码中的WiFi名称和密码为自己的WiFi名称和密码。