合宙air724ug与stm32连接爬取天气预报的代码

以下是合宙air724ug与stm32连接并爬取天气预报的代码示例：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "stm32f10x.h"
#include "usart.h"

#define AT_CMD_BUF_LEN  128
#define RECV_BUF_LEN    512
#define TIMEOUT         3000

static char at_cmd_buf[AT_CMD_BUF_LEN];
static char recv_buf[RECV_BUF_LEN];

void delay(uint32_t nCount);

void send_at_cmd(char *cmd, uint32_t timeout)
{
    USART_SendString(USART1, cmd);
    delay(timeout);
}

int recv_at_resp(char *resp, uint32_t timeout)
{
    int len = 0;
    int i = 0;

    while (timeout--) {
        len = USART_GetString(USART1, recv_buf, RECV_BUF_LEN);
        if (len > 0) {
            if (strstr(recv_buf, resp) != NULL) {
                return 1;
            }
            else {
                i++;
                if (i > 10) {
                    return 0;
                }
            }
        }
        delay(1);
    }

    return 0;
}

int main(void)
{
    USART1_Init();

    // 等待串口初始化完成
    delay(1000);

    // 设置AT指令回显关闭
    send_at_cmd("ATE0\r\n", TIMEOUT);
    if (!recv_at_resp("OK", TIMEOUT)) {
        printf("ATE0 failed!\r\n");
        return -1;
    }

    // 连接到WiFi
    sprintf(at_cmd_buf, "AT+CWJAP=\"ssid\",\"password\"\r\n");
    send_at_cmd(at_cmd_buf, TIMEOUT);
    if (!recv_at_resp("OK", TIMEOUT)) {
        printf("AT+CWJAP failed!\r\n");
        return -1;
    }

    // 获取IP地址
    send_at_cmd("AT+CIFSR\r\n", TIMEOUT);
    if (!recv_at_resp("OK", TIMEOUT)) {
        printf("AT+CIFSR failed!\r\n");
        return -1;
    }

    // 打开TCP连接
    send_at_cmd("AT+CIPSTART=\"TCP\",\"api.openweathermap.org\",80\r\n", TIMEOUT);
    if (!recv_at_resp("CONNECT", TIMEOUT)) {
        printf("AT+CIPSTART failed!\r\n");
        return -1;
    }

    // 发送HTTP请求
    sprintf(at_cmd_buf, "GET /data/2.5/weather?q=Shenzhen&appid=your_appid HTTP/1.1\r\nHost: api.openweathermap.org\r\nConnection: close\r\n\r\n");
    sprintf(recv_buf, "HTTP/1.1");
    send_at_cmd("AT+CIPSEND\r\n", TIMEOUT);
    if (!recv_at_resp(">", TIMEOUT)) {
        printf("AT+CIPSEND failed!\r\n");
        return -1;
    }
    send_at_cmd(at_cmd_buf, TIMEOUT);
    if (!recv_at_resp(recv_buf, TIMEOUT)) {
        printf("HTTP request failed!\r\n");
        return -1;
    }

    // 接收HTTP响应
    while (1) {
        int len = USART_GetString(USART1, recv_buf, RECV_BUF_LEN);
        if (len > 0) {
            printf("%s", recv_buf);
            if (strstr(recv_buf, "}") != NULL) {
                break;
            }
        }
        delay(1);
    }

    // 关闭TCP连接
    send_at_cmd("AT+CIPCLOSE\r\n", TIMEOUT);

    while (1) {
        ;
    }

    return 0;
}

void delay(uint32_t nCount)
{
    for(; nCount != 0; nCount--);
}

这段代码中，我们通过串口与合宙air724ug模组进行通信，使用AT指令连接到WiFi并打开TCP连接，然后发送HTTP请求获取天气预报信息，最后关闭TCP连接。在实际使用中，需要将代码中的ssid、password和your_appid替换为实际的WiFi名称、密码和OpenWeatherMap的API Key。